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# Questions Asked onOctober 29, 2010

1. ## physics

With acceleration of 2500 m/s2, how long will it take to rreach speed of light

2. ## math

pt) Anne, Bill, and Cathy are eating dinner together at a restaurant. When it is time for dessert, the server tells them that the restaurant has apple, cherry, pecan, blueberry, and pumpkin pies; carrot, German chocolate, coconut, and apple spice cakes;

3. ## biochemistry

can alanine at ph 7 have a carboxyl group (-COOH) and the amino group (-NH2)?

4. ## chemistry

Are amino acids other than the usual 20 amino acids found in proteins? If so, how are such amino acids produced?

5. ## chemistry

consider the following reactions O+N2->NO+N Ea=315kj/mol Cl+H2->HCl+H Ea=23kj/mol Why is the activation energy for one much lower that the other. The frequency factor is very close in value for the two. Assume they are the same compute the ratio of the

6. ## Calculus

find the derivative y= csc^-1 (secx) 0 less than or equal to x less than or equal to 2¤Ð what did i do wrong? - 1/ secx sqrt(secx^2 -1) * secxtanx

7. ## math

write each ratio as a fraction in simplest form? 60 to 24 is it 60/24 = 15/6???

8. ## english 3

who was the main character in epicac

9. ## computer science

write a program that prompts the user to input three numbers. The program should then output the numbers in nondescending order.

10. ## Calculus

find all values of x for which function is differentiable. y=lnx^2 why is the answer= for all x doesn't equal 0?

11. ## Math

when // lines are cut by a transveral, alternate exterior angles are congruent. true of false ? Explain please.

12. ## chemistry

Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the following reaction. CH4(g) + NH3(g) → HCN(g) + 3 H2(g) What is the heat of reaction at constant pressure? Use the following thermochemical equations. N2(g) + 3 H2(g) → 2

13. ## CALC HARD...

Suppose that 430 ft of fencing is used to enclose a corral in the shape of a rectangle with a semicircle whose diameter is a side of the rectangle. (In the figure below, the blue outline represents the fencing.) Find the dimensions of the corral with

14. ## chemistry

Carbon disulfide is a colorless liquid. When pure, it is nearly odorless, but the commercial product smells vile. Carbon disulfide is used in the manufacture of rayon and cellophane. The liquid burns as follows. CS2(l) + 3 O2(g) → CO2(g) + 2 SO2(g)

15. ## CALC HARD...

Suppose that 430 ft of fencing is used to enclose a corral in the shape of a rectangle with a semicircle whose diameter is a side of the rectangle. (In the figure below, the blue outline represents the fencing.) Find the dimensions of the corral with

16. ## math

Write the equation of the hyperbola with centre at (3,-1),vertex)6,-1),one asymptote with equation2x-4y=9

17. ## CALC HARD...

Suppose that 430 ft of fencing is used to enclose a corral in the shape of a rectangle with a semicircle whose diameter is a side of the rectangle. (In the figure below, the blue outline represents the fencing.) Find the dimensions of the corral with

18. ## math

20 fl oz/min = __ qt/day answer: 1qt/4 day?

19. ## health

The job of a privacy official is to A. Develop and implement privacy policies & and & prosedures. B. Monitor the use of passwords and other types of security measures. C. Determine what information is private and what can be disclosed. D. Conduct risk

20. ## psychology

220514130014401434210 find the variance

21. ## physics

A 2100 kg car rounds a curve of 67 m banked at an angle of 13. If the car is traveling at 105 km/h, will a friction force be required? If so, in what direction?

Erm how does this site wrk?

23. ## eth 125

Make a prediction about opportunities and challenges that an increase in diversity may present in the United States

24. ## health

If an instructional review board is involved in a request for information, the information is likely sought by a A. Health care facility. B.Researcher. C. Court. D. Substance abuse center.

25. ## Ecology

Questions (4-5) You let your neighbor shoot coyotes on your ranch in Arizona. After all the coyotes are gone, you notice that the rabbit population increases dramatically. Along with this you notice that the rabbits have consumed most of the grasses and

26. ## chemistry

Suppose you mix 20.1 g of water at 66.2°C with 44.6 g of water at 35.7°C in an insulated cup. What is the maximum temperature of the solution after mixing?

27. ## chemistry

A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 26.5 g of water in a calorimeter, the temperature of the water increased from 25.00°C to 30.00°C. What is the specific heat of the metal?

28. ## Chemistry

Alumminum hydroxide reacts with sulfuric acid as follows: 2Al(OH)3+H2SO4-->Al2(SO4)+6H2O. Which reagent is the limiting reactant when 0.500 mol Al(OH)3 and 0.500 mol H2SO4 are allowed to react? How many moles of Al2(SO4)3 can form under these conditions?

29. ## health

A notice of use & and & disclosure is required for A. Every patient a doctor treats. B. New patients,but not established patients. C. patients whose personal health information the doctor intends to disclose. D. Patients treated for sensitive conditions,

30. ## chemistry

suppose you have an unlimited supply of copper (II) chloride to react with iron. How many moles of copper would be produced by reacting 34 grams of iron with the copper(II) chloride solution?

31. ## chemistry

Ethylene glycol, HOCH2CH2OH, is used as antifreeze. It is produced from ethylene oxide, C2H4O, by the following reaction. C2H4O(g) + H2O(l) → HOCH2CH2OH(l) Use Hess's law to obtain the enthalpy change for this reaction from the following enthalpy

32. ## chemistry

Calculate the heat released when 4.260 L Cl2 with a density of 2.46 g/L at 25°C reacts with an excess of sodium metal to form solid sodium chloride at 25°C.

33. ## chemistry

How many grams of oxygen gas are required to produce 7.46 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water? 2 H2(g) + O2(g) → 2 H2O(g) ΔH = −484 kJ Liquid water has a heat of vaporization of 44.0 kJ per mole at 25°C.

34. ## chemistry

How much heat is released when a mixture containing 12.6 g CS2 and 12.6 g Cl2 reacts by the following equation? CS2(g) + 3 Cl2(g) → S2Cl2(g) + CCl4(g) ΔH° = −230. kJ

35. ## Physics

A building superintendent twirls a set of keys in a circle at the end of a cord. If the keys have a centripetal acceleration of 115 m/s2 and the cord has a length of 0.36 m, what is the tangential speed of the keys?

36. ## Calculus

Let f(x)=−2 x^3 − 3 x^2 − 2 x − 10. Find the interval where f is concave up. I Answer: < x < Find the interval where f is concave down. Answer: < x < Find the inflection point of f. Answer: x=

37. ## math correct or not correct

1.5 gal/min = __ qt/hr 360 qt/hr?

38. ## math correct or not correct

1.5 gal/min = __ qt/hr 360 qt/hr?

41. ## math

Anna and Julia each take a bicycle trip. Anna rides 20 miles in 1 1/3 hours. Julia rides 246 miles in 16 hours. Which has slower unit rate? By how much?

42. ## Physics

Which of the following is not a unit of power? a)hp b)J c)W d)J/s I answered d. J/s because its measuring speed and not power. I don't know if its correct or not.

43. ## science

I need to describe what a standard operating procedure is and what procedures it may involve. Thankyou.

44. ## Chemistry

Calculate the molarity of 1.77 mol of LiCl in 30.6 L of solution. This is for hw that's submitted online. the answer i got is 0.06 M. but it says its wrong, whyyyyy?

45. ## math

What is the rate in meters per second of a jetliner this is travelling at a rate of 846 km/h

46. ## PHYSICS

A car is traveling along a road, and its engine is turning over with an angular velocity of +199 rad/s. The driver steps on the accelerator, and in a time of 14.2 s the angular velocity increases to +263 rad/s. (a) What would have been the angular

47. ## math

A student claims that a ratio remains unchanged if 1 is added to both the numerator and the denominator of the fraction. Does a/b equal a + 1/b + 1? Write and explanation and give an example or counterexample.

48. ## chem

A sample containing 7.60 gas has a volume of 31.0 . Pressure and temperature remain constant.What is the volume after 3.00 is added to the gas already in the container

49. ## math

a 50 pound bag of glossy coat horse feed cost $23.50. A 25 pound bag cost$15.50. How much money per pound would you save by buying the bag with the lower unit price?

50. ## Math

find the the 2nd derivative and set equal to zero in order to find inflection points of the function f(x)=1/(5x^2+4)

What do enzymes do in digestion?

52. ## Chemistry

how many moles of Ba(OH)2 are present in 295mL of 0.400 M Ba(OH)2?

53. ## Physics - Spring balls

A 275g ball is resting on top of the spring that is mounted on the floor. You exert a force of 325N on the ball and it compresses the spring 44.5cm. If you release the ball from the position, how high above the equilibrium position of the spring-ball

54. ## Math - Simple rational functions (check)

Consider the function f(x) = x/(x-1) Are there any turning points? Explain how this could help you graph f(x) for large values of x? Ans: turning points is another word for checking the concavity, and therefore i find the second derivative and equate it to

55. ## Physics

A 0.026 kg bullet is fired vertically at 205 m/s into a 0.15 kg baseball that is initially at rest. How high does the combined bullet and baseball rise after the collision, assuming the bullet embeds itself in the ball?

56. ## Math - derivative of a rational function

find the 1st derivative of f(x) = x/(x-1)2 Is the 1st derivative f'(x)= -x-1/(x-1)^3

57. ## statistics

question- a packaging device is set to fill detergent powder packets with a mean weight of 5 kg .the standered deviation is known to be 0.01kg.these are known to drift upward over a period of time due to machine fault,which is not tolerable.a random sample

58. ## phyiscs

if 0.4 force is required to pull a body attaching to spring 0.1m from the position of equality find the spring constant?

59. ## statistics/probability

QUESTION- machines are used to pack sugar into packets supposedly containing 1.20kg each.on testing a large number of packets over a long perodof time ,it was found that the mean weight of the packets was 1.24kg and the standard deviation was 0.04kg. a

60. ## phyiscs

if 0.4 force is required to pull a body attaching to spring 0.1m from the position of equality find the spring constant?

61. ## Physics

Calculate the earth's orbital angular speed in radians/sec due to its motion around th sun.

62. ## Commerce

Answer: profit= price - total cost P = price ( GIVEN IN THE QUESTION ) Total cost = (Average cost) * Quantity ( Because AC = TC/Q ) TC= Q^3 - 8Q^2 + 36Q + 3 TC is also equal to Q * P Therefore Q *( P ) = Q^3 - 8Q^2 + 36Q +3 now you can solve ( if necessary

63. ## Management 330

o Identify four types of control mechanisms (ways controls are applied) used in your selected organization. o Compare and contrast these control mechanisms. o Determine the effectiveness of these control mechanisms. o Examine the positive and negative

64. ## chemistry

What is the bond angle for H2O2 abd what is the bond angle and how would you draw ClO3-

65. ## PHYSICS

A CAR IS BEING DRIVEN BY AFORCE OF 2.5*10POWER10N.TRAVELLING AT ACONSTANT SPEED OF 5m/s,IT TAKES 2 MINUTES TO REACH A CERTAIN PLACE.CALCULATE THE WORK DONE.

66. ## phyiscs

1.5*10power13

67. ## Management 330

I don't need someone to do this for me I need some links where I can the info myself All I am getting is essays to buy

68. ## statis

why it is necessary to summarise the data distribution?explain the approaches available to summarise the data distribution.

69. ## statistics/probability

explain the purpose of fabulous presentation of statistical data

70. ## statistics/probability

give a brief note of the measures of central tendency together with their merits and demerits. which is the best measure of central tendency and why?

ms.john class took a timed test. What was the minimum and maximum times? 8.5 9.2 7.1 7.03 90.04 8.09

72. ## physics

the condition of apparent weightlessness for the passengers can be created for a brief instant when a plane flies over the top of a vertical circle. at a speed of 215 meters per second, what is the radius of the vertical circle that the pilot must use?

73. ## spanish

"¿Puedes sacar libros de la biblioteca?" "Sí, puedo _____ porque tengo tarjeta de biblioteca." a. las sacar b. a sacarlos c. sacarlos d. sacar B?

74. ## spanish

Van a dar las noticias a las doce en el canal dos. Vamos _____. a. a verlas b. ver c. a ver d. las ver A?

75. ## Psychology

Compare and contrast the James-Lange and the Cannon-Bard theories of emotional processing. Describe how these theories might have different implications for our behaviour.

76. ## college

How fast (in rpm) must a centrifuge rotate if a particle 8.2 cm from the axis of rotation is to experience an acceleration of 200000 g 's?

77. ## AP physics

suppose that the surface (radius=r) of the space station is rotating at 35.8 m/s. what must be the value of r for the astronauts to weigh one-half their earth weight?

78. ## science

1.which two particles are found in an atoms nucleus? 2. which two particles in an aton are equal in number? 3. what two particles account for almost all of the mass of an atom?

79. ## science

how far will the different types of footballs affect the distance the football will go?

80. ## maths

double of 16 + 68 is equal to

what is the process of importing a car from a foreighn country to your mother country?

82. ## statistics

In a supermarket the weekly demand D is normally distributed. In a sampe of size n = 15 we …nd D = 31 and sD = 19. (a) H0 :  = 30 versus Ha :  > 30 (3 methods; = 5%) (b) H0 :  = 16 versus Ha :  > 16 (2 methods, = 10%)

if the ones digit of a number greater than 1 is 0, what factors must that number have?

A 3.00*10^2 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. (a) Find the work

85. ## English - Caesar & Antigone

Can you check these questions? 1) Which is an example of verbal irony as spoken by Antigone? a)"You have yourself to consider, after all." b)"You must decide whether you will help me or not." c)". . . and if I must die, / I say that this crime is holy . .

Julian is interested in building a new house. Three architects have given him plans. The first plan is for a house that will be 2,250 square feet. The total cost of the house will be $281,250. The second plan is for a house that will be 2,400 square feet. asked by jaz 87. ## english "The editors . . . break those sequences up into quick jagged shots that key us up and keep us hyper-alert . . . we look hard at the screen to take it in." universality? asked by danny 88. ## geometry In a triangle ABC,E and F are the mid-points of AC and AB respectively. The altitude AP to BC intersects EF at Q.Prove AQ =PB. asked by Surendra 89. ## maths Find the x-coordinates of all points on the curve y=2sin-sin^2x at which the tangent line is horizontal. asked by khela 90. ## business math find the interest paid on loan for 2 years simple interest rate of 9% per year asked by debbie 91. ## business math a mans salary is 114,712 and he is paid bi weekly how much is his gross pay biweekly asked by debbie 92. ## Calculus Shell method Use cylindrical shells to find the vol of the solid that results when the region enclosed by y=x^2, y=4 and x=0 is revolved about the x axis asked by Osvi 93. ## Physics What are the forces acting on an elevator as it moves from rest upward and stops at its floor. Discuss the forces including tension force (on cable or string), gravitational force, and net force when an elevator is at rest. Which law does this support? asked by Margaret Yeager 94. ## Calculus Shell method 2 Use cylindrical shells to find the vol of the solid that results when the region enclosed by y=x^3-5x^2+6x over [0,2] is revolved about the y axis asked by Osvi 95. ## business math 50oxes of computer paper unit price is$13.37 and the single trade rate is 15% find the net price - Im sorry my mistake

the number increased from 599 to 625 find the% of the increase

97. ## biology

The sex ratio(number of females vs. males) of which of the following species might be most affected by global warming?A.Humans b.bees c.birds d.Turtles

98. ## math

Four race car drivers participate in a race on a loop track. All four are going at a constant speed. Assume that they did a flying start. That is, all four crossed the start line at the same instant while each was going their constant speed. Then they

99. ## economics

ABC Machinery produces ice machine with historical (monthly) data in the Excel file. Please construct its short-run total cost function to answer the following questions: QUESTIONS 1. Given the data, please construct a Short-Run total cost (TC) function

100. ## Physics

(10 points) 3. Use your data from Part 3 and Newton’s laws to explain why the force meter measures a force if the cart is moving at a constant velocity. The forces acting on the cart are the applied force (FA), the force of friction (Ff), weight (Fg) and

101. ## Physics

Suppose I have a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, I have an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and

102. ## physics

Consider a hoola-hoop of radius R and it is spinning about its symmetry axis at a constant angular velocity. Now, I double its mass and halve its angular velocity. What is the new angular momentum in terms of the initial angular momentum?

103. ## physics

A chain of length l and mass ë per unit length is fully open and is held on a high frictionless table with y1 of its length hanging from the side of the table as shown in figure. When released, it starts slipping off the table. By calculating the speed of

138. ## physics

A ceiling fan of radius 30 cm runs at 76 rev/min. How far does the tip of the fan blade travel in 2 hour(s)?

139. ## economics

Ninety-one-day Treasury bills carry an investment return (IR) of 6.25 percent. What is their purchase price? What is their discount rate (DR)? What are the formulas and how do you figure the answer? Thank you so very much.

140. ## math

What is the APY for money invested at each rate? (A) 6% compounded monthly (B) 4% compoumded continuously

141. ## Physics

How will drag force and air resistance affect an object in circular motion in the air?

142. ## math

do 94 * 73 with showing the lattice work.

144. ## arithmetic

The 6th term of Gp is 2000.find its first term if its common ratio

if u have the lcm how do u find the numbers that make the lcm

146. ## Chemistry

'Place the letter of th item in Column II on th line before its best match in Column I' Column I: 37. moderator 38. coolant 39. control rod 40. critical mass Column II: a. removes heat from reactor b. slows neutrons produced by fission c. limits number of

147. ## Chemistry

Which alkyl halide would you expect to undergo an SN2 reaction most slowly? 1-bromo-4-methylpentane 1-bromo-3-methylpentane 1-bromo-2-methylpentane 1-bromo-2,2-dimethylbutane I am really confused with this topic and no I have been reading up on it, but I

148. ## health

If disclosure of PHI is permitted under the HIPAA, what is disclosed? A. All information the particular doctor has on that patient. B. Information the doctor thinks should be disclosed. C. The minimum necessary to accomplish the purpose of the disclosure.

149. ## college

Under typical conditions, 1 1/2 ft of snow will melt to 2 in of water. To how many inches of water will 4 1/3 ft of snow melt?

150. ## geometry

n the circle below, angle a = 7x + 2 and angle b = 9x - 4. Find the measure of arc MN

151. ## math

The quotient of a number and 7 is equal to 6. What is that number?

152. ## scc

One side of a triangle is half the longest side. The third side is 10 meters less than the longest side. The perimeter is 45 meters. Find all three sides

154. ## Chemistry

42. List four of the factors that affect the rate of a chemical reaction. Temperature Concentration of reactants Surface area Volume Is this correct? Thanks -MC

155. ## Math: Calculus

A fence 6 feet tall runs parallel to a tall building at a distance of 2 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?

156. ## Math: Calculus

A cylinder is inscribed in a right circular cone of height 3.5 and radius (at the base) equal to 7. What are the dimensions of such a cylinder which has maximum volume?

157. ## math

Use the properties of exponents to rewrite each expression so that it contains only positive exponents and simplify the result. The answer is suppose to be 1/9. thank you (b^-1/3a^-1)(3a/b)^-1

158. ## Calculus

Find the solution of the logarithmic equation: ln(x+8)+ln(x–8)=0 Im not sure how to approach this one. I tried moving the ln(x-8) to the other side and solving for x and that did not work. I also tried putting everything as an exponent to e. please help!

159. ## Calculus

Find the solutions of the exponential equation e^(2x)-5e^(x)+6=0

160. ## math

Use the properties of exponents to rewrite each expression so that it contains only positive exponents and simplify. (x^-1y^-2/x^-2y^3)^2

161. ## Biology

Describe the features of the nasal cavity that moisten, clean, and warm the air as it passes through this cavity on its way to the lungs.

162. ## maath

How to do you solve this 3^x=9 graphically? What do I do. Thank you

163. ## Math- Calc

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. y=e^(4x), y=e^(6x), x=1

164. ## Math- Calc

Find the volume of the solid formed by rotating the region enclosed by y=e^(4x)+2, y=0, x=0, x=0.8

165. ## chemistry/ specific heat

Why does an empty metal pan on a stove heat much faster than the same pan filled with water? Explain why your car overheats if your fan belt breaks. Explain why your car overheats if your radiator has a hole in it.

166. ## calculus

can someone please help me with these 3 questions: 1) Evaluate the limit. lim_(x->infinity) (ln(ln(4 x)))/(4 x) 2)Find y ' and y ". y= ln(5 x)/x^7 3)y =(arctan)(x - sqrt(1+x^2)) for this question i got y = -1/(2(1+x^2))which was wrong. Please and thank

167. ## Chemistrty Help

Calculate the wavelength of each of the following frequencies of electromagnetic radiation. 1040 kHz} (typical frequency for AM radio broadcasting) (assume four significant figures) in METERS? Can someone help me?

168. ## Chemistry

Need help anwering this: 43. Explain how the fission can be slowed in the nuclear reactor. Thanks -MC

169. ## math

(5^-1p^4)^-2 (3y^-4)^2

170. ## poetry

Can someone explain what the poem is trying to tell in "Ode to the West Wind" I read from other sites but I don't understand it... I believe that it is talking about death...

171. ## Chemistry

Calculate the pOH, pH, and percent protonation of solute in the following aqueous solution. 0.059 M quinine, given that the pKa of its conjugate acid is 8.52. Please show me how to do it and not just the answers. Thanks!

172. ## algebra

v-4(4-V)=-2 (2V-1)

173. ## trig

If a=8, the angle C=50 degrees and the angle A=35 degrees find the other angle B and the remaining b and c sides. Give your answer to at least 3 decimal places.

174. ## Physics

A flywheel has a moment of inertia of 2.6 kg·m2. What is the average power needed to spin it up from rest to an angular velocity of 100 rad/s in 30 seconds?

175. ## art

need lots of questions for art

176. ## chemistry

a student dissolves 5 grams of table salt into 600 mL of water. in this situation, water is the _, and salt is the _

177. ## Chemistry

A heat lamp produces 22.5 watts of power at a wavelength of 6.0 {\rm \mu m}. How many photons are emitted per second? 1{watt}} = 1 J/s i got 7.02*10^20 but that is incorrect, can you help?

178. ## Math

'bonnie has b stickers. first, bonnie gave away 1/6 of her stickers. Then Bonnie got 12 more stickers, and she has 47. Write an equation, involving B, the corresponds to this situation"

179. ## physics

A 4.4 diameter merry-go-round is rotating freely with an angular velocity of 0.63 . Its total moment of inertia is 1800 . Four people standing on the ground, each of mass 66 , suddenly step onto the edge of the merry-go-round.

180. ## Math

An auditorium has 50 rows of seats. The first row has 20 seats, the second row has 21, the third row has 22 seats, and so on, each row having one more seat than the previous row. How many seats are there all together? a. write 2 different expressions for

181. ## Math

a. Write down a secret number, which can be any whole number Multiply by 5 Add 2 Multiply by 4 Add 2 Multiply by 5 Subtract 50 Drop the two zeros at the end. Do you recognize the result? B. Let S stand for a secret number that you begin with in part (a).

182. ## accounting

ehat type of financial reports would you expect to see in your department if you are a new accountant

183. ## algebra

please translate “A student scored five points more on the second quiz than he did the first. He scored eleven points lower on the third quiz than he did the first. If the average of the three quiz scores is 70, what was his score on the first quiz?”

184. ## algebra

Use the five steps for problem solving to answer the following question. Please show all of your work. The average of two quiz scores is 81. If one quiz score is six more than the other quiz score, what are the two quiz scores?

185. ## eng 155

Have a done the adverbs correctly? If you have not sung Karaoke yet, chances are you will have the chance real soon. Karaoke is a form of entertainment that is growing very rapidly in popularity. It started more than twenty years ago in a snack bar in

186. ## Physical Science

Tritium (half-life= 12.3 y) is used to verify the age of expensive brandies. If an old brandy contains only 1/16 of the tritium present in new brandy, how long ago was it produced?

187. ## Chemistry

Write balanced complete ionic equation for HC2H3O2(aq) + K2CO3(aq)-----> H2O(l)+CO2(g)+KC2H3O2(aq) I put 2H+(aq)+2C2H3O2-2(aq)2K+(ag)+CO3-2(aq)------>H2O(l)+CO2(g)+2K+(aq)+C2H3O2-2(aq) and said it was wrong, but I got this part right. 2H+(aq)+CO3

188. ## Com 155

I need to know if I have found the errors for an assignment. Thanks! I put the corrections in parenthesis. Comparative forms of superlative adjectives: Since 1995, the third week in April has been TV-Turnoff week. A not-for-profit group in Washington,

189. ## ethics

Where do we get our ethical standards from?

how do you solve a problem when you have one whole # with a whole # and fraction. this is subtracting ex: 16 -10 2/7 ________________

191. ## English - Antigone & Caesar

Please check these answers: 2) Creon declares that anarchists are behind the burial of Polyneices. What dramatic irony lies in the declaration? a)The audience knows that it is the Sentry who buried him. b)The audience knows that it is a priest who buried

192. ## social studies

Why did british condemn it as an unlawful assembly and a den of traitors?

193. ## chemistry

How much of a 0.23 M NaOH solution is needed to neutralize 27 mL of a 0.85 M sulfuric acid solution? The units are mL. Can you please explain why you did what did Thank you

194. ## English

Alright for my 1 paper i am writing this sentence and i don't know if its grammatically correct. All I could think of was “what in the world am I going to invent!?” Does that sound right or did i mess something up?

195. ## Science Lab -Half-Life of Popcorn

When a radioactive sample decays, there is one less parent nuclei and one more daughter nuclei. As this decay process continues, the number parent nuclei decreases and the number of daughter nuclei increases. Eventually there are no parent nuclei

196. ## math

-7w+23=8w+1

How many core electrons are there in a ground state sulfur atom?

198. ## Calculus

Find the derivative of f(x)=x(1-4^x) f'(x)=(1-4^x)+ (-4^x)(ln-4)(-4)(x) ln can't be negative. Is the derivative correct?

199. ## Psychology

Describe in detail, the two methods of language acquisition

200. ## Earth Science

During June 21-22, determine the length of daylight at the following latitudes. Any help is greatly appreciated. latitudes --------------- 70 degrees north 40 degrees south 40 degrees north 90 degrees south 0 degrees

201. ## algebra

For three consecutive passes the football team gained 10 yards and then loses 23 yards and then gains 47 yards. What is the total net yardage?

202. ## MATHEMATICS

HOW TO SOLVE THIS EQUATION: 0.2*Z + LOG(10.2*Z)= 3.512 THANKS IN ADVANCE

203. ## Earth Science

How many hours of daylight occur at the following locations on the specified dates? March 22 ---------------- 40 degrees north 0 degrees 90 degrees south December 22 ---------------- 40 degrees north 0 degrees 90 degrees south

204. ## Earth Science

Please determine the noon sun angle at the given latitudes on April 11: 40 degrees north 0 degrees

205. ## english

Compare and contrast your abilities as an academic writer now as opposed to when you began at Axia College. Using four comparatives and four superlatives within your responses, explain what has led to these changes and what changes you will make in the

206. ## chemistry

there are two naturally occurring isotopes of the element zinc. the relative abundance and mass of each are as follow 64 30zn=48.89% 63.929 amu 66 30zn=27.81% 65.926 is it 0.4889(63.929)+027.81(65.926) divide by 2?

207. ## chemistry

there are 5 naturally occurring isotopes of the element zinc. the relative abundance and mass of each are as follow 64 30zn=48.89% 63.929 amu 66 30zn=27.81% 65.926 67 30zn=4.11% 66.927 68 30zn = 18.57% 67.925 70 30zn = 0.62% 69.925 find the average atomic

Which economic system is the best solution to handling a crisis of epic proportion?

209. ## MATH

WRITE THE POINT-SLOPE FORM FOR THE EQUATION OF THE LINE DESCRIBED. THROUGH (4,2), PARALLEL TO Y=-3/4X-5


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# Using FIML to impute missing covariate data

2 posts / 0 new
Offline
Joined: 09/02/2015 - 11:44
Using FIML to impute missing covariate data

I am running a simple ACE model with covariates (e.g., sex, age). Now I am trying to impute missing covariate data using full information maximum likelihood (FILM) (as described here: https://openmx.ssri.psu.edu/docs/OpenMx/2.0.0-3838/FIML_RowFit.html).

To do this, I used an example script that was posted earlier by Mike Neale (https://openmx.ssri.psu.edu/sites/default/files/UnivariateTwinAnalysis_MatrixRaw-3.R) as a response to a post in this forum (https://openmx.ssri.psu.edu/thread/554). To get missing values, I added the following code to the script before I run the ACE including covariates model:

dzData[1:3,3] <- NA #delete 3 datapoints from age covariate (first twin)

However, I got the following error message:
Error in runHelper(model, frontendStart, intervals, silent, suppressWarnings, :
Error: NA value for a definition variable is Not Yet Implemented.

which, basically says that it is not possible to use FILM to impute missing data in covariates if I understand it correctly.
As I was told by a reviewer that it is possible to use FILM to impute missing covariate data, I however wanted to be sure that I run the analysis in the right way. Is there for example a command or option I didn't use, or am I using code that is too old? Or is FILM, indeed, only possible to use for the phenotypic (dependent) variables? And if so, are there any alternatives to listwise deletion?

I installed the latest version of OpenMx, using source('https://openmx.ssri.psu.edu/getOpenMx.R') and I am using R version 3.1.2.

Thank you so much for you time and effort.
Kind regards,
Inga Schwabe

Offline
Joined: 01/24/2014 - 12:15
Impute, or just work around missing values?

Hi, Inga. Do you want to actually impute missing values on your covariates? Or do you just want to make full use of a dataset in which the covariates sometimes have missing values? I'm guessing it's probably the latter.

Note that everything I say in this post assumes that you are not using any ordinal variables.

If you're entering the covariates into your MxModel as "definition variables," then you can follow the trick I describe here, which involves setting the missing values on the covariates to a "pseudo-missing value," and setting the corresponding phenotype values to NA. You can then proceed with running the MxModel. Note that FIML, by itself, does not impute anything. Instead, it adjusts the likelihood function for each row of the dataset to be the multivariate-normal density of the subset of the endogenous variables that have non-missing values for that row.

If you're using your covariates only for linear regression as part of specifying the MxModel's means, an alternate way to proceed would be to treat the covariates as endogenous variables instead of definition variables. In this case, you would be modeling the joint distribution of phenotypes and covariates, and you would appropriately write the regression of phenotypes onto covariates into the specification of the MxModel. The simplest way to do that is probably to use RAM path specification, and represent the regression onto covariates by having single-headed paths running from covariates to phenotypes.

The error message you're seeing occurs because when doing FIML, OpenMx will work around missing values on the endogenous variables (the phenotypes), but does not tolerate NAs among the definition variables. Both approaches I described side-step the problem of NAs among the definition variables. The first changes the NAs to a pseudo-missing value, and then ensures that the pseudo-missing value will be ignored by setting the appropriate phenotype scores to NA. The second obviates the need for definition variables to begin with.

If for some reason you actually want to impute missing values on the covariates, FIML can help you there, too, but OpenMx does not have any kind of built-in imputation feature. You would start by obtaining a FIML estimate of the means and covariance matrix of the joint distribution of the phenotypes and covariates. I could describe this further if you'd like.

format: plain


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## Defensive Bishop

#### Problem

In a game of chess, the Bishop can take any piece that lies on a diagonal.

By placing five Bishop pieces on a 4 by 4 grid every square is protected in such a way that no Bishop threatens any other Bishop.

However, it is possible to achieve the same with just four bishops.

What is the least number of Bishop pieces required to protect every square on a standard 8 by 8 chessboard?

#### Solution

It is possible to protect every square on a chessboard by using just eight Bishop pieces; this is one way it can be done.

How many different ways can this be achieved?
What about an $n$ by $n$ grid?
What is the maximum number of non-threatening Bishops pieces that can be placed on a four by four grid?


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λ Tony's blog λ
The weblog of Tony Morris

# Functional Java 2.9

Posted on August 5, 2008, in Programming

Patient: I have 6 potentially failing methods (a, b, c, d, e, f) and if one of those fails, I want to cease execution and return that failure, otherwise continue execution.

Doctor: What do they return if they succeed?

Patient: Nothing, they side-effect

Doctor: eek! OK, let’s see what we can do? What happens after you’ve completed this computation?

Patient: Well, it gets a bit hairier you see. Then I have 3 more potentially failing computations (g, h, i) and if any of those fail (or the original failed), then I also want to fail, however, I want to keep the errors in these last three computations.

Doctor: So let’s get this right, you perform all of the latter three computations regardless of their outcome and you only succeed if all nine computations succeed and you fail otherwise?

Patient: Yes, that’s right and…

Doctor: And for whatever silly reason, you’re using Java.

Patient: cowers; er yeah.

Doctor: Well, I’ve told you about that, haven’t I?

Patient: cowers more; yes you have but…

Doctor: So, if any of the first six computations fail, then you check the latter three for failures as well. These latter three are side-effecting, void return type, as well aren’t they?

Patient: Yes…

Doctor: If the first six succeed, you perform the latter three computations anyway, accumulating potential failures.

Patient: Right, exactly

Doctor: And just as an interesting observation, you will have at most, four errors and possibly none in the event of all nine succeeding.

Patient: Umm yeah, I hadn’t thought of it that way.

Doctor: smiles

Validation<Throwable, Unit> a;
Validation<Throwable, Unit> b;
Validation<Throwable, Unit> c;
Validation<Throwable, Unit> d;
Validation<Throwable, Unit> e;
Validation<Throwable, Unit> f;
////
Validation<Throwable, Unit> g;
Validation<Throwable, Unit> h;
Validation<Throwable, Unit> i;

Validation<Throwable, Unit> first() {
return a.sequence(b).
sequence(c).
sequence(d).
sequence(e).
sequence(f);
}

Option<NonEmptyList<throwable>> second() {
return first().nel().accumulate(Semigroup.<throwable>nonEmptyListSemigroup(),
g.nel(),
h.nel(),
i.nel());
}

Doctor: Now, this is the best that Java can do at solving this very popular request of yours, but come and see me when you’re ready to upgrade your tools…

Patient: Thanks Doc! I will!

Doctor: outward smile, inward scepticism; In the meantime, I will prescribe you with Functional Java 2.9 which is only going to work if you exercise at least some amount of intellectual discipline. You will need it for the solution above.

Update: Functional Java 2.10 includes Validation.sequence.


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# inverse of even number of elements in a group

if an abelian group with |G|=n where n is odd. if i take out the identity i'm left with even # of distinct elements. can this mean that each element has an inverse which is not itself?? not a homework question! thanks

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add comment

## 2 Answers

In a group of odd order, no element is its own inverse, since that would yield a subgroup of order $2$, and the order of a subgroup divides the order of the group.

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D'oh. I used a super-cannon to shoot this little bird. –  Hagen von Eitzen Oct 14 '12 at 17:31
@Hagen: :-) Well, it's always good to have super-cannons at your disposal, and if you practice your aim on little birds once in a while, you don't get out of practice in case you ever do need that super-cannon :-) –  joriki Oct 14 '12 at 17:36
ohh God that didnt cross my mind!! thanx a ton joriki!! :)) –  d13 Oct 14 '12 at 17:45
add comment

By the classification theorem of finite abelian groups, $G$ is a direct sum of cyclic groups. If $n$ is odd, each cyclic summand must be odd and odd cyclic groups have no involutions apart from 1. Hence you are right.

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thnx a lot!! i havent yet taken anything about direct sum of cyclic groups yet. but i will surely keep this in mind. –  d13 Oct 14 '12 at 17:47
add comment


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# Thread: Am I being really stupid or what? (Differentiation)

1. ## Am I being really stupid or what? (Differentiation)

Hi

$t^{{\alpha}-1} dt$

When you differentiate that, its not
$({\alpha}-1)t^{{\alpha}-2$ ? Surely it is just $0$ ?

Or am I just being completely stupid..

2. ## Re: Am I being really stupid or what? (Differentiation)

$\frac{\mathrm{d}}{\mathrm{d}t}\ t^{a}\ =\ at^{a-1}$

(where t is the independent variable and a is a constant power)

or as we usually say,

$\frac{\mathrm{d}}{\mathrm{d}x}\ x^{n}\ =\ nx^{n-1}$

I haven't twigged why you want it to be 0.

3. ## Re: Am I being really stupid or what? (Differentiation)

Nvm Solved it, its beena long day and I just made a stupid error xD


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# What will be the temperature when the rms velocity is double of that at 300k?

Arun
25763 Points
one year ago

$V_{rms} = \sqrt{\frac{3RT}{M}}$

$\Rightarrow V_{rms}\ \propto\ \sqrt{T}$

$V_{rms}$  will be doubled when temperature increases four times.

$\therefore$  Temperature = 4 $\times$ initial temperature

= 1200 K

Hope it helps

Khimraj
3007 Points
one year ago

Let the initial and final velocities be u and v respectively.

Since v and u are propotional to √T

v/u = √T(final)/√T(initial) = 2

Squaring on both sides, 4=T(final)/T(initial)

T(initial) = 300 K

Therefore T(final) = 4 × 300 = 1200 K