Questions Asked on
June 30, 2013

  1. Chemistry

    A mixture of nitrogen gas and hydrogen gas reacts in a closed container to form ammonia gas. The reaction ceases before either reactant is completely consumed. At this stage the container has 3.0 mol each of all three gases; nitrogen, hydrogen and ammonia.

    asked by megs
  2. PHYSICS 2

    An electron in an x-ray machine is accelerated through a potential difference of 1x10^4 V before it hits the target. What is the kinetic energy of the electron in electron volts?

    asked by mike
  3. Phyiscs

    A satellite circles the earth in an orbit whose radius is 2.07 times the earth's radius. The earth's mass is 5.98 x 1024 kg, and its radius is 6.38 x 106 m. What is the period of the satellite?

    asked by Justin S.
  4. Physics

    Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin while it moves upward after it is released?

    asked by Jill
  5. physics

    A heavier mass m1 and a lighter mass m2 are 18.0 cm apart and experience a gravitational force of attraction that is 9.70 10-9 N in magnitude. The two masses have a combined value of 5.65 kg. Determine the value of each individual mass.

    asked by Jarrod
  6. physics

    A block is pressed against a vertical wall by a force , as the drawing shows. This force can either push the block upward at a constant velocity or allow it to slide downward at a constant velocity. The magnitude of the force is different in the two cases,

    asked by bill
  7. Accounting

    Department E had 4,000 units in Work in Process that were 40% completed at the beginning of the period at a cost of $12,500. 14,000 units of direct materials were added during the period at a cost of $28,700. 15,000 units were completed during the period,

    asked by Anonymous
  8. Physics

    An object is moving with constant velocity -->v Which situation is impossible in such a circumstance? 1. One force acts on the object. 2. Three forces act on the object. 3. No forces act on the object. 4. Two forces act on the object. 5. Four forces act on

    asked by Laura
  9. math

    Solve the mathematical puzzle. Determine the digits of F from these clues. The digits of F are all the same. The sum of all the digits of F is 12. The answer when any two of the digits are multiplied together is also 9. F is a four-digit number.

    asked by Bria S.
  10. Writing

    SAT essay practice. Learning starts with failure; the first failure is the beginning of education. -John Hersey Assignment: The statement above implies that failure is educational. Write an essay supporting, disputing, or qualifying this thesis. You might

    asked by Anonymous
  11. physics

    A toboggan slides down a hill and has a constant velocity. The angle of the hill is 6.50° with respect to the horizontal. What is the coefficient of kinetic friction between the surface of the hill and the toboggan?

    asked by francis
  12. Chemistry

    A hard water sample contains 121 mg of CaCO3 per liter of water. Calculate the mass of Na3Po4 needed to remove all Ca^2+ ions from 2.50 L of the water sample?

    asked by Angela
  13. Chemistry 2

    What is the predominant intermolecular force responsible for the dissolution of the hydrophilic end of soap in water? Using dashed lines, illustrate where the intermolecular force occurs between atoms in adjacent molecules? Lone pair electrons have been

    asked by Angela
  14. Accounting

    If Department H had 600 units, 60% completed, in process at the beginning of the period, 8,000 units were completed during the period, and 500 units were 30% completed at the end of the period, what was the number of equivalent units of production for the

    asked by Anonymous
  15. Math (Combinatorics)

    In how many ways can I place 5 different beads on a bracelet if flipping or rotating the bracelet does not change the order of the beads?

    asked by Joseph
  16. College Math

    Brandywine Homecare, a not for hire business, had revenues of $12 million in 2011. Expenses other than depreciation totaled 75 percent of revenues, and depreciation expense was $1.5 million. All revenues were collected in cash during the yar and all

    asked by Marie
  17. kaplan

    Below you will find a medical senerio that includes (3) medical records to read and a medical word chart. Please identify 15 medical terms that would be unfamiliar to layman or non-member medical person and place these terms in the chart below

    asked by Anonymous
  18. Chemistry

    How would I calculate this? 30.0 mL of pure water at 280. K is mixed with 50.0 mL of pure water at 307 K. What is the final temperature of the mixture?

    asked by Mary
  19. physics

    After sliding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.8 m/s. Miranda runs after her at a velocity of +4.8 m/s and hops on the inner tube. How fast do the two of them slide across

    asked by Derek
  20. physics

    A man is standing on a platform that is connected to a pulley arrangement, as the drawing shows. By pulling upward on the rope with a force the man can raise the platform and himself. The total mass of the man plus the platform is 94.7 kg. What pulling

    asked by frank
  21. Accounting

    Department J had no work in process at the beginning of the period, 18,000 units were completed during the period, 2,000 units were 30% completed at the end of the period, and the following manufacturing costs were debited to the departmental work in

    asked by Anonymous
  22. Chemistry (check)

    Not sure if these are right 1) What is the Molar Enthalpy of Neutralization (ΔHn) in kJ/mol if 5.00 moles of HCl(aq) (acid) neutralized 5.00 moles of NaOH(aq) (base) and released 13093 J of heat? 13093/5= 2618.6 then convert to kj 2) Calculate the Molar

    asked by Mary
  23. Discrete Math

    A special type of password consists of four different letters of the alphabet, where each letter is used only once. How many different possible passwords are there?

    asked by John
  24. Physics

    a 3.6 kg object is accelerated from rest to a speed of 34.4 m/s in 42 s. What average force was exerted on the object during this period of acceleration. Answer in units of N.

    asked by Jill
  25. physics

    A man is standing on a platform that is connected to a pulley arrangement, as the drawing shows. By pulling upward on the rope with a force the man can raise the platform and himself. The total mass of the man plus the platform is 94.7 kg. What pulling

    asked by jessica
  26. Physics

    A 3.6 kg object is accelerated from rest to a speed of 34.4 m/s in 42 s. What average force was exerted on the object during this period of acceleration? Answer in units of N

    asked by Lynn
  27. physics

    A rescue helicopter is lifting a man (weight = 925 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 2.59 m/s2? (b) What is the tension during the remainder

    asked by ashley
  28. Physics

    a 3.6 kg object is accelerated from rest to a speed of 34.4 m/s in 42 s. What average force was exerted on the object during this period of acceleration. Answer in units of N.

    asked by Lynn
  29. Physics

    a 3.6 kg object is accelerated from rest to a speed of 34.4 m/s in 42 s. What average force was exerted on the object during this period of acceleration. Answer in units of N.

    asked by Lynn
  30. Chemistry

    The reaction b/t H2 and O2 yield water vapor and has a change of heat =-484kJ.Ho much PV work is done and what is the value of the change of E in kJ for the reaction of 0.50 mol of H2 with 0.25 mol of O2 amd atmospheric pressure of 1.00 , the volume change

    asked by Angie
  31. Further mathematics

    An exponential sequence (GP)of positive terms and a linear sequence (AP)have the same first term.the sum of their first terms is 3,the sum of their second terms is 3 and the sum of their third terms is 6. Find the sum of their fifth terms

    asked by Lizzy
  32. math

    the average middle distance runner at a local high school runs the mile in 4.5 minutes with a standard deviation of 0.3 minute the percentage of a runners that will run the mile in less than 4 min is %

    asked by angie
  33. Physics

    Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin when it is at its highest point? a. Force

    asked by Laura
  34. science

    a machine gun can fire 20 bullet persecond if speed of bullet is 100m/s and if each bullet weight 100grams calcuate force required to hold the gun in its position

    asked by physics
  35. physics

    A calorie is unit of heat or energy and it equals about 4.2J, where 1J= 1 kgm2/s2. Suppose we employ a system of units in which the unit of mass α kg, the unit of length β m & the unit of time γ s. Show that a calorie has a magnitude of 4.2α-1β-2γ-1

    asked by Radhika
  36. physics

    The drawing shows box 1 resting on a table, with box 2 resting on top of box 1. A massless rope passes over a massless, frictionless pulley. One end of the rope is connected to box 2, and the other end is connected to box 3. The weights of the three boxes

    asked by josh
  37. Physics

    When switched off, a spinning ceiling fan slows down with an angular acceleration of 1.2 rad/s2. If the fan was spinning at the rate of 10π rad/sec before it was turned off, how many revolutions did it go through before coming to the stop?

    asked by Al
  38. Statistics

    A department store is running a promo one Saturday by giving out coupons for $10 of free merchandise. However, one-third of customers spend $40, and one-third spend$75. The remainder of customers who come in the store do not take advantage of the promo at

    asked by Leslie
  39. chemistry

    the titration of 25.0 mL of a 0.040 M aqueous solution of maleic acid C2H2(COOH)2, with aqueous 0.10 M NaOH solution. For maleic acid, Ka1 = 0.013 and Ka2 = 8.5 x 10-7 How many milliliters of the 0.10 M NaOH solution are needed to completely react all the

    asked by sue
  40. mathematics

    Express this ratio in its simplest form $6:72

    asked by nathan
  41. physics

    Three forces act on a moving object. One force has a magnitude of 83.4 N and is directed due north. Another has a magnitude of 47.2 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object

    asked by landan
  42. Physics

    A convex mirror form an image of height 2.4cm, if the radius of covature of the mirror is 40cm.find the height,distance of the object from the front of the mirror

    asked by Adams
  43. finance

    Suppose Twin Cities Memorial Hospital has issued tax-exempt bonds that have an interest rate of 6 percent. With all else the same, should John buy the HCA or the Twin Cities bonds?

    asked by Anonymous
  44. Math

    A particular bacterium is found to have a doubling time of 20 minutes. If a laboratory begins with a population of 300 of these bacteria, and there is no change in the growth rate, how many bacteria will be present in 55 minutes?

    asked by Jazzy
  45. Calc I

    How do I find the derivative for the sqrt(sin(e^(x^3)*cos(x)))??? I know this is a combination of the chain rule and product rule. Please help!

    asked by Coolio
  46. Physics

    A dragster and driver together have mass 929.4 kg. The dragster, starting from rest, attains a speed of 26.5 m/s in 0.55s. What is the size of the average force on the dragster during this time interval? Answer in units of N.

    asked by Lynn
  47. Physics

    A 39.2-kg boy, riding a 2.39-kg skateboard at a velocity of +4.97 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.48 m/s, 9.54° above the

    asked by Jamie
  48. physics

    A 9.90-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.372. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b)

    asked by kidd
  49. physics

    Part (a) of the drawing shows a bucket of water suspended from the pulley of a well; the tension in the rope is 69.0 N. Part (b) shows the same bucket of water being pulled up from the well at a constant velocity. What is the tension in the rope in part

    asked by johhny
  50. pre cal

    Factor completely: 3x^2(4x2 + 1)^8 + 64x^4(4x2 + 1)^7.

    asked by jovahnna
  51. physics

    Part (a) of the drawing shows a bucket of water suspended from the pulley of a well; the tension in the rope is 69.0 N. Part (b) shows the same bucket of water being pulled up from the well at a constant velocity. What is the tension in the rope in part

    asked by bobby
  52. Chemistry (please check)

    2) Calculate the Molar Enthalpy of Neutralization (ΔHn) in kJ/mol of the reaction between a monoprotic acid and a monoprotic base, given the following information: The temperature change equals 5.06°C, 50.0 mL of 1.00 M concentration of Acid 50.0 mL of

    asked by Mary
  53. Special Ed

    Answer to no. 1

    asked by Anonymous
  54. Accounting Theory

    Instructions: The Company has one asset. The asset has a three-year life and two possible payoffs each year: 1) $750 with a probability of 40%, and 2) $100 with a probability of 60%. The company depreciates assets using the straight-line method. Assume the

    asked by Matt
  55. Physics

    A dragster and driver together have mass 929.4 kg. The dragster, starting from rest, attains a speed of 26.5 m/s in 0.55s. What is the size of the average force on the dragster during this time interval? Answer in units of N.

    asked by Lynn
  56. maths

    if 7 pencils cost £1.68 how much will 10 cost?

    asked by jamelia
  57. Physics

    A dragster and driver together have mass 929.4 kg. The dragster, starting from rest, attains a speed of 26.5 m/s in 0.55s. Assume the driver has a mass of 77.4 kg. What horizontal force does the seat exert on the driver? Answer in units of N.

    asked by Lynn
  58. Mechanial engineering

    HW7_1A: BENDING MOMENT DIAGRAMS AND STRESSES, PART I We will obtain bending moment diagrams for three beams and calculate stresses inside the beams. For each beam, take the x-axis along the neutral axis of the beam, oriented from left to right, with origin

    asked by Colour
  59. Finance

    A firm with 50% debt to equity ratio has a cost of equity capital of 15%, a cost of debt of 9% and a tax rate of 33%. The firm is considering a project costing 5,000 that will generate an annual cash flow of 1,000 for the next 8 years. What is the projects

    asked by Fred
  60. sd224

    Let S be the set of {(1,0),(0,1),(1,1),(1,−1),(−1,1)}-lattice path which begin at (1,1), do not use the same vertex twice, and never touch either the x-axis or the y-axis. Let Px,y be the number of paths in S which end at the point (x,y). Determine

    asked by doeom
  61. Human Resources

    Creating a Budget Various budget approaches play an important role in resource allocation in human service organizations. You are the executive director for a local government workforce agency that focuses on providing career- and work-related skills. The

    asked by Dawn
  62. physics

    How long does it take a plane, traveling at a constant speed of 166 m/s, to fly once around a circle whose radius is 4000 m?

    asked by Justin S.
  63. Maths

    A sequence {ai}is defined by the recurrence relation an=40−4an−1 with a0=−4. There exists real valued constants r,s and t such that ai=r⋅si+t for all non-negative integers i. Determine r2+s2+t2.

    asked by Abhishek Ranjan
  64. math

    what is the standard form of 7.5x10*8

    asked by elaiza
  65. Statistics

    There is a mathematical theory called queuing theory that studies ways in which computer jobs are fed in CPUs and researches on how these can be reduced to a minimum. Show how can a computer estimate the average number of jobs waiting at a queue? Suppose

    asked by Rubi
  66. Statistics

    Many times, we are required to use statistical measures to try and construct a problem. We run a program for a 10 different inputs. The times are measures in 1-second intervals and none of them took 0 secs. a. Suppose the standard deviation of a set of

    asked by Rubi
  67. MATH

    I don't understand this,so can you please explain more clearly. Where did you get the 1/5? 1.The point P divides the interval joining A(-1,-2) to B(9,3) internally in the ratio 4:1. Find the coordinates of P.

    asked by Anonymous
  68. Writing

    My corrections (please check grammar...etc): As I reflected back I realized that my friends got better grades than me. ...better grades than me... What is wrong with this? ...seek for help... What is wrong with this? ... it instead learns... What is wrong

    asked by Anonymous
  69. college algebra: probability and statistics

    You roll a single die once. What is the probability you will roll an odd number or an even number?

    asked by Angelina
  70. psych statistics

    Martha believes that a relaxation technique involving visualization will help people with mild insomnia fall asleep faster. She randomly selects a sample of 20 participants from a group of mild insomnia patients and randomly assigns 10 to receive

    asked by Valeria
  71. math

    Sams shoes makes a profit of 38$ on every pair of athletic shoes it sells. How many pairs of shoes must Sam sell to earn a profit of 950?

    asked by kris
  72. finance

    b. Suppose the hospital pays out $300,000 in dividends. A stockholder receives $10,000. If the stockholder’s tax rate on dividends is 15 percent, what is the after tax dividend?

    asked by Anonymous
  73. help

    How do you lose weight? A. By using up less energy than you take in B. By using up more money on diet programs and pills C. By using up less calories than you take in D. By using up more calories than you take in

    asked by Anonymous
  74. Help

    Do this sentence have the correct pronoun usage Natalia is a better cook than me

    asked by Anonymous
  75. Trigonometry

    Let z be a complex number such that z=2(cos8∘+icos82∘). Then z^5 can be expressed as r(sinα∘+icosα∘), where r is a real number and 0≤α≤90. What is the value of r+α?

    asked by Drake
  76. Chemistry

    How would I calculate this? I have the answer because its from a previous test I just want to know how I would calculate it. How many grams of NaCI are contained in 350. mL of a 0.133 M solution of sodium chloride?

    asked by Mary
  77. Chemistry

    How would I calculate these? I have the answers because there from a previous test. 1) How much heat is required to raise the temperature of a 5.52-g sample of iron ( specific heat = 0.450 J/g C) from 25.0 degrees C to 79.8 degrees C? 2) You mix 60. mL of

    asked by Mary
  78. algebra

    what is negative one sixth times two and three fourths

    asked by bri
  79. Trignometry

    Find the missing parts of the triangle. C = 124.2° a = 6.90 km b = 11.60 km

    asked by jolly
  80. math

    Find the difference between the sum of 378 and 401 and the product of 43 and 17

    asked by nathan
  81. algebra 1

    simplify (m^2 n^-3)^2 (-m^-3 n^3)^3

    asked by lisa
  82. chemistry

    what is the wavelength of the radiation absorbed when an electron move from n=2 to n=5 for a helium +1 ion?

    asked by joy
  83. Maths

    what is the max value of y=x^22/10x^logx

    asked by Tony
  84. precalc

    solve the following logarithmic equation: 2lnx= log base e^3 343

    asked by Anonymous
  85. math

    x-5y=-21 9y-8x=44 substitution method

    asked by lisa
  86. Chemistry

    What is the difference between polar and nonpolar molecules?

    asked by Mary
  87. Mechanics/Physics

    HW7_1B_2 : 5.0 POINTS Let's say that a cross section where you have M+max is at location x+max, and the cross section where you have M−max is at location x−max. Use the MATLAB window below to plot the profiles of stress on sections x+max and x−max,

    asked by Dude
  88. Statistics

    you are going to test the claim that more than 60% of men refuse to ask for directions when lost. if you use a significance level of .10, what will the critical number be for your rejection region?

    asked by Amaury
  89. Databaes

    Show me an example on how I can create and establish a database of a library and a security firm?

    asked by Jnr John
  90. Business Statistics

    Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.

    asked by Anonymous
  91. Jolly

    Find the magnitude and direction angle for the given vector. 12√(2), -12√(2)

    asked by Trig
  92. Calculus Help

    I have looked high and low to figure out how to start this question. I have no clue! Any help would be great!! Rainbows are formed when light strikes raindrops and is reflected and refracted. The Law of Refraction states that (sin alpha)/(sin beta) = k,

    asked by Ryan
  93. Physics

    a person jumps from a ledge 3.7 meters and when he drops to the ground it takes .7 meters for him to stop what is the force applied to his body

    asked by Cat
  94. help please

    What are eating disorders? A. An illness that leads to starvation B. An illness that causes serious disturbances to a person’s everyday diet C. An illness that causes little disturbance to a person’s everyday diet D. An illness that leads to binging I

    asked by Anonymous
  95. Chemistry

    How many moles of iron atoms does a 27 g sample contain?

    asked by RAID
  96. Physical science

    Why are models important?

    asked by sandy