ami

Most popular questions and responses by ami
  1. PHY

    Two snowcats tow a housing unit to a new location at McMurdo Base, Antarctica, as shown in Figure 4-46. The sum of the forces A and B exerted on the unit by the horizontal cables is parallel to the line L, and FA = 4300 N. Determine FB and the magnitude of

    asked on September 13, 2010
  2. physics

    The earth has a radius of 6380 km and turns around once on its axis in 24 h. 1)What is the radial acceleration of an object at the earth's equator? Give your answer in m/s^2 2) What is the radial acceleration of an object at the earth's equator? Give your

    asked on September 9, 2010
  3. physics

    A block of ice of mass 4.10 kg is placed against a horizontal spring that has force constant k = 210 N/m and is compressed a distance 2.60×10−2 m. The spring is released and accelerates the block along a horizontal surface. You can ignore friction and

    asked on October 7, 2010
  4. physics

    The electric field E_1 at one face of a parallelepiped is uniform over the entire face and is directed out of the face. At the opposite face, the electric field E_2 is also uniform over the entire face and is directed into that face (the figure ). The two

    asked on February 19, 2011
  5. chm

    What is the pH of the solution obtained by mixing 30.00mL OF 0.250M HCL AND 30.00mL OF 0.125M NaOH?

    asked on March 31, 2010
  6. 152

    Ka for hypochlorous acid,HCLO, IS 3.0*10^-8. Calculate the pH after 10.0,20.0,30.0, and 40.0mL OF 0.100M NaOH have been added to 40.0mL of 0.100M HCLO..

    asked on March 31, 2010
  7. A.P. Economics

    8. Which factor of production is represented by each of the following? An office building: An assembly line worker: A tree used to make paper: Unused soil: An artist: A student:

    asked on August 6, 2009
  8. phyics

    Who will hear the voice of a singer first-a person in the balcony 50 m away from the stage (Fig. 22-19), or a person 2000 km away at home whose ear is next to the radio? Assume that the microphone is a few centimeters from the singer and the temperature is

    asked on March 17, 2011
  9. chem

    For the equilibrium reaction: CO(g)+H2O(g)CO2(g)+H2(g) the Keq value at 690°C is 10.0. A mixture of 0.300 mol of CO, 0.300 mol of H2O, 0.500 mol of CO2 and 0.500 mol of H2 is placed in a 1.0 L flask. a)Write the Keq expression for this reaction and use

    asked on January 26, 2012
  10. chm

    If 0.0490g of AgIO3 DISOLVES per liter of solution, calculate the solubility product constant.

    asked on June 27, 2010
  11. statistics

    What is wrong with the following statements? a) For a large n, the distribution of observed values will be approximately Normal b) 68-95-99.7 rule says that "x bar" should be within m (mean) +/- 2 SD (standard deviation) about 95% of the time c) The

    asked on October 14, 2012
  12. Chem

    Calculate the [NH4+] in solution that is 0.25 M NH3 and 0.20 M NaOH. (Kb for NH3 = 1.8 x 10-5) I set up ICE from the equation: NH3 + H20 ------NH4 + OH- I 0.25 0 0 C -x +x +x E 0.25-x x x 1.8 *10^-5 = x*x/ 0.25-x 4.5* 10^-6 = x2 took the square root to

    asked on April 6, 2010
  13. chm152

    When solid NH4HS is placed in a closed flask at 28 C, the solid dissociates according to the equation: NH4HS(s) NH3(g) + H2S(g) The total pressure of the equilibrium mixture is 0.766 atm. Determine Kp at this temperature. Choose one answer. a. 0.147 b.

    asked on March 27, 2010
  14. phyics

    The position of a 2.75 *10^5 N training helicopter under test is given by r = (0.020 m/s^3)(t^3)i + (2.2 m/s)(t)j - (0.060 m/s^2)(t^2) k Find the net force on the helicopter at t =5.0s. Express your answer in terms of i,j,k. Express your coefficient using

    asked on September 16, 2010
  15. phys

    Water flows steadily from an open tank into a pipe as shown in the figure. The elevation of the top of the tank is 12.3 m, and the elevation at the pipe is 3.80 m. The initial cross-sectional area of the pipe (at point 2) is 5.60×10−2 m^2; and at where

    asked on December 9, 2009
  16. PHY

    The components of a vector V can be written (Vx, Vy, Vz). What are the components and length of a vector which is the sum of the two vectors, V1 and V2, whose components are (5.0, 1.3, -15.0) and (2.3, -4.7, -1.0)?

    asked on August 22, 2010
  17. PHYSICS

    A particle confined to motion along the x axis moves with constant acceleration from x = 2.0 m to x = 8.0 m during a 2.5-s time interval. The velocity of the particle at x = 8.0 m is 2.8 m/s. What is the acceleration during this time interval?

    asked on September 15, 2008
  18. chem

    20ml sample of .200M HBr is titrated w/ .200M NaOH. what is the ph after adding 15ml (base)?

    asked on April 13, 2008
  19. physics

    A stone is dropped from the top of a cliff. It hits the ground below after 3.10 s. How high is the cliff?

    asked on August 26, 2010
  20. CHM 152

    Consider the following equilibrium: PCl3 + Cl2 = PCl5 Kc=26 @ 250 degree Celcius 1.0 mol of PCl3 , 1.0 mol of Cl2 , and 5.0 mol of PCl5 are placed in a 10.0L flask at 250 C and allowed to come to equilibrium. What is the concentration, in M, of at

    asked on March 26, 2010
  21. STOR

    Each of the following statements contain a blunder. Explain in each case what is wrong. a) There is a high correlation between the age of American workers and their occupation. b) we found a high correlation (r=1.19) between students rating of faculty

    asked on September 6, 2012
  22. A.P. Economics (Please check if I'm right)

    Leaving class today, you decide to start an economics tutoring business. Your first step is to get the two categories of capital. Next you need to obtain the other factors of production. Specifically, what do you need in terms of land, labor, and capital.

    asked on August 6, 2009
  23. phy

    A cube of ice is taken from the freezer at -7.5°C and placed in a 101 g aluminum calorimeter filled with 282 g of water at room temperature of 20°C. The final situation is observed to be all water at 16°C. What was the mass of the ice cube?

    asked on December 2, 2010
  24. math

    The shape of a patio is trapezoidal with a height of 9 ft and bases of 14 ft and 8 ft. What is the cost 24) of outdoor carpeting to cover the patio if the carpeting costs $2.50 per ft2?

    asked on November 5, 2013
  25. his

    discuss in details the truman doctrine, the berlin airlift, and the marshall plan confrontation between US and Soviet union during coldwar. what evetns began each crisis. How did the other side react and what were the outcomes of each?

    asked on July 26, 2010
  26. phy

    A boat can travel 2.60 m/s in still water.If the boat points its prow directly across a stream whose current is 1.10 m/s, what is the velocity (magnitude and direction) of the boat relative to the shore? What will be the position of the boat, relative to

    asked on September 5, 2010
  27. physics

    According to recent test data, an automobile travels 0.250 mi in 19.9 s, starting from rest. The same car, when braking from 60.0 mi/h on dry pavement, stops in 146 ft. Assume constant acceleration in each part of the motion, but not necessarily the same

    asked on September 1, 2010
  28. ChemistryPRELABS

    In the synthesis of K3[Al(C2O4)3].3H2O, 0.0357 moles of the limiting reagent were used in the reaction. What is the maximum possible yield? And which is the limiting reagent?

    asked on December 1, 2015
  29. physics

    A projectile is being launched from ground level with no air resistance. You want to avoid having it enter a temperature inversion layer in the atmosphere a height h above the ground. 1) What is the maximum launch speed you could give this projectile if

    asked on September 10, 2010
  30. force of gravity

    A satellite orbits around the earth. The mass of the satellite is 1170 kg, and its altitude is 220 km. The mass of the earth is 5.98×1024 kg. The radius of the earth is 6.38×106 m. 1)What is the gravitational force on the satellite? 2)What is the orbital

    asked on December 9, 2009
  31. phy

    An ordinary glass is filled to the brim with 350.0 mL of water at 100°C. If the temperature decreased to 19°C, how much water could be added to the glass?

    asked on November 24, 2010
  32. physics

    A bowling ball weighing 71.8 N is attached to the ceiling by a rope of length 3.83 m. The ball is pulled to one side and released; it then swings back and forth as a pendulum. As the rope swings through the vertical, the speed of the bowling ball is 4.50

    asked on September 23, 2010
  33. phy

    A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 340 km/h in a semicircular arc with a radius of 196 m. Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant

    asked on September 18, 2010
  34. PHY

    The coefficient of static friction between hard rubber and normal street pavement is about 0.68. On how steep a hill (maximum angle) can you leave a car parked?

    asked on September 12, 2010
  35. Psychology

    How does astigmatism affect the way the perceptual system works?

    asked on April 18, 2019
  36. phy

    Two snowcats tow a housing unit to a new location at McMurdo Base, Antarctica, as shown in Figure 4-46. The sum of the forces A and B exerted on the unit by the horizontal cables is parallel to the line L, and FA = 4300 N. Determine FB and the magnitude of

    asked on September 12, 2010
  37. chm

    The molar solubility of PbBr2 at 250C is 1.0x10^-2. Calculate the Ksp.

    asked on June 27, 2010
  38. story

    Investment reports often include correlations. Following a table of correlations among mutual funds , a reports add," Two funds can have perfect correlation, yet differnet levels of risk. For example, Funda A and Fund B may be perfectly correlated, yet

    asked on September 5, 2012
  39. phy

    A 175 kg horizontal beam is supported at each end. A 300 kg piano rests a third of the way from one end. What is the vertical force on the support closest to the piano? N What is the vertical force on the support furthest from the piano? N

    asked on October 22, 2010
  40. PHY

    Vector V1 is 9.00 units long and points along the negative x axis. Vector V2 is 4.72 units long and points at +50.0° to the +x axis. (a) What are the x and y components of each vector? V1x = V1y = V2x = V2y = (b) Determine the sum V1 + V2. Magnitude AND

    asked on August 22, 2010
  41. chm

    Calculate the PH OF A SOLUTION prepared by mixing 15.0mL OF 0.50 M OF NaOH AND 30.0mL OF 0.50 M BENZOIC ACID SOLUTION?( Benzoicacid is monoprotic and its dissociation constant is 6.5*10^-5)

    asked on March 31, 2010
  42. Chem

    What molarity of a NH4NO3 solution has a pH of 5.220? Kb for NH3 is 1.8 x 10^-5. Choose one answer. a. 6.31x 10-6. b. 2.21 x 10-6 c. 5.56x 10-10. d. 0.065 I started by taking the inverse log of the PH to get (6.02*10^-6) then I was thinking its not the way

    asked on April 6, 2010
  43. phys

    A disk rolls down a slope. It rotational axis is its center of mass. It is rotation at a constant angular speed making 34.0 full revolutions in a time interval of 3.30 s. 1)What is the rotational inertia of the disk if its mass is 11.7 kg, and its radius

    asked on December 7, 2009
  44. phy

    What mass of steam at 100°C must be added to 1.00 kg of ice at 0°C to yield liquid water at 15°C?

    asked on December 2, 2010
  45. phy

    What is the distance from the Earth's center to a point outside the Earth where the gravitational acceleration due to the Earth is 1/12 of its value at the Earth's surface?

    asked on September 17, 2010
  46. Stor 155

    a data set lists apartments available for students to rent. Information provided includes the monthly rent, whether or not cable is included free of charge, whether or not pets are allowed, the number of bedrooms, and the distance to the campus. Describe

    asked on August 25, 2012
  47. math

    write a definition for an equivalent fraction. A. a fraction of multiplication B. fraction with unlike denominators C. a fraction with the value of n D. a fraction thar represents equal amount I put down D.

    asked on July 29, 2012
  48. Ecnomics Answer check

    I had asked this question earlier and Ms. Sue had helped me with one. I have tried the other two...will you please let me know if I'm on the right track???? Thank you Explain how each of the following people would talk about scarcity and trade-offs. a) The

    asked on August 26, 2009
  49. stor

    Twitter: Suppose that the population proportion of Internet users whosay they use Twitter or a similar service to post updates about themselves or to see updates about others is 19%. Think about selecting random samples from a population in which 19% are

    asked on September 17, 2012
  50. chm152

    PCl3 + Cl2 = PCl5 Kc=26 @ 250 degree Celcius 1.0 mol of PCl3 , 1.0 mol of Cl2 , and 5.0 mol of PCl5 are placed in a 10.0L flask at 250 C and allowed to come to equilibrium. What is the concentration, in M,of cl2 of at equilibrium? Choose one answer. a. 3.4

    asked on March 26, 2010
  51. Chem

    Calcaulate the pH after 10.0 mL of 0.40 M HCl is added to 20.0 mL of 0.50 M NaOH. I wasn't sure on how to start this problem. I tried to break the HCl and NaOH apart then I set up ICE for each but I did get the wrong answer of 13.70. a. 0.40 b. 13.70 c.

    asked on April 6, 2010
  52. phy

    A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 340 km/h in a semicircular arc with a radius of 196 m. Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant

    asked on September 19, 2010
  53. ChemistryPRELABS

    The mass of potassium iodate (KIO3) contained in an impure sample was determined by titration with sodium thiosulfate (0.1005 M). The impure KIO3 was dissolved in 50 cm 3 of water, an excess of potassium iodide (KI) and 5 cm 3 of dilute sulphuric acid was

    asked on October 6, 2015
  54. CHEM

    For the equilibrium reaction Co(g)+H2O(g)CO2(g)+H2(g) the Keq value at 690°C is 10.0. A mixture of 0.300 mol of CO, 0.300 mol of H2O, 0.500 mol of CO2 and 0.500 mol of H2 is placed in a 1.0 L flask. a) Write the Keq expression for this reaction and use

    asked on January 27, 2012
  55. chem

    A solution initially contains 0.350 mol/L of A and 0.750 mol/L of B. A reaction occurs according to the equation 2 A(aq)+B(aq) 3 C(aq)+D(s) At equilibrium, [C] is found to be 0.100 mol/L. What is the value of Keq?

    asked on January 26, 2012
  56. algebra

    What is the greatest common factor of the following monomials? 20xyz, 30x^2z, 40xyz^2 a) 5y^2 b) 10x^2 c) 5xyz d)10xz b

    asked on May 30, 2010
  57. CHM

    Given the initial concentrations of 0.10 atm NO2 and 0.10 atm N2O4 in a 1.0 L flask, what will be the equilibrium partial pressure of NO2? N2O4(g)=2NO2 Kp=0.660at319K Choose one answer. a. 0.10 atm b. 0.31 atm c. 0.045 atm d. 0.72 atm e. 0.19 atm

    asked on March 28, 2010
  58. phys

    Consider an antelope being chased by a tiger. The antelope is running at a velocity of 5.21 m/s at an angle 14.3 degree E of S. The tiger is running at a velocity of 11.64 m/s at an angle of 31.4 degree W of S. (Use East as positive x and North as postive

    asked on November 27, 2009
  59. A.P. Economics

    How do patents and copyrights promote innovations? Please help me answer this question...I've read my text thrice and also searched it in google!!! Thanks..

    asked on September 7, 2009
  60. phy

    Two crates, of mass m1 = 60 kg and m2 = 130 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 60 kg crate. The coefficient of kinetic friction is 0.15.

    asked on September 12, 2010
  61. physics

    An engineer of a passenger train traveling at 25.0 m/s sights a freight train whose caboose is 200m ahead on the same track. The freight train is traveling at 15.0 m/s in the same direction as the passenger train. The engineer of the passenger train

    asked on September 2, 2010
  62. Physics

    When two vectors vector A and vector B are drawn from a common point, the angle between them is phi. If vector A and vector B have the same magnitude, for which value of phi will their vector sum have the same magnitude as vector A or vector B?

    asked on August 26, 2010
  63. chm152

    Consider the following equilibrium: 5.0 moles of are placed in a 10.0 L flask at 200 C and allowed to come to equilibrium. Analysis shows that 1.0 mole of is present in the equilibrium mixture. How many moles of Cl2 are present at equilibrium. Choose one

    asked on March 27, 2010
  64. phy

    A ball of mass 0.540 kg moving east (+x direction) with a speed of 3.30 m/s collides head-on with a 0.740 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision? a)ball originally at

    asked on October 7, 2010
  65. CHEM

    Calculate the vapor pressure at 25 C of hexane above the solution. The vapor pressure of pure hexane at 25 C is 151 torr. A solution contains naphthalene ({\rm{C}}_{10} {\rm{H}}_8) dissolved in hexane ({\rm{C}}_6 {\rm{H}}_{14}) at a concentration of 12.17

    asked on June 5, 2010
  66. his

    Whst steps did louis XIV to consolidate his power as the absolute monarh of France?

    asked on July 12, 2010
  67. AP Economics

    Identify the trade-offs and opportunity cost of a decision using a decision-making grid. what is a decision making grid???? please can someone help me????

    asked on August 8, 2009
  68. phy

    Two crates, of mass m1 = 60 kg and m2 = 130 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 60 kg crate. The coefficient of kinetic friction is 0.15. (a) Calculate the acceleration of the system.(to the

    asked on September 13, 2010
  69. his

    in august 1945 the US dropped the atomic bomb on japan what are the justification for and aganist dropping the bomb?

    asked on July 26, 2010
  70. physics

    At what displacement from the equilibrium is the total energy of a simple harmonic oscillator one - sixths KE and five - sixth PE? Answer should be in terms of the amplitude A.

    asked on November 6, 2009
  71. mat 172

    solve the equation: arccosx+arccos2x=arccos1/2

    asked on March 30, 2010
  72. Stor

    It would be quite risky for you to insure the life of a 25-year-old friend . There is a high probability that your friend would live and you would gain $875 in premiums. But if he were to die, you would lose almost $100,000. Explain carefully why selling

    asked on October 4, 2012
  73. Economics

    A firm is currently producing in the elastic portion of its demand curve. What course of action do you recommend for it assuming it wants to raise revenue? Continue producing at the current output level, because it maximizes its total revenue by producing

    asked on November 19, 2011
  74. phy

    Two crates, of mass m1 = 60 kg and m2 = 130 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 60 kg crate. The coefficient of kinetic friction is 0.15.

    asked on September 12, 2010
  75. phy

    A horse canters away from its trainer in a straight line, moving 140 m away in 16.0 s. It then turns abruptly and gallops halfway back in 5.0 s. (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the

    asked on August 27, 2010
  76. CHM 152

    Consider the following equilibrium: PCl5 = PCl3+ Cl2 5.0 moles of are placed in a 10.0 L flask at 200 C and allowed to come to equilibrium. Analysis shows that 1.0 mole of is present in the equilibrium mixture. How many moles of are present at equilibrium.

    asked on March 26, 2010
  77. chm

    Liquid nitrogen is obtained by condensing gaseous nitrogen found in air and boils at 77.36 K. At the boiling point, the density of the liquid is 809 g/L and that of the gas 4.566 g/L. How many liters of liquid nitrogen are produced when 500.0 L of nitrogen

    asked on February 2, 2011
  78. phy

    A helicopter is ascending vertically with a speed of 5.50 m/s. At a height of 155 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the

    asked on August 26, 2010
  79. Stor

    Here is a simple way to create a random variable X that has mean μ and stan- dard deviation σ: X takes only the two values μ−σ and μ+σ, eachwith probability 0.5. Use the definition of the mean and variance for discrete random variables to show that

    asked on October 4, 2012
  80. phy

    A baseball is hit nearly straight up into the air with a speed of 24 m/s. (a) How high does it go? (b) How long is it in the air?

    asked on August 26, 2010
  81. CHM 152

    For the system 2A (g) + B( g) = 2C (g), if the initial concentration of pure C is 1.00 M, the equilibrium concentration is 0.40 M. What is the value of Kc? Choose one answer. a. 5.0 b. 0.45 c. 0.67 d. 2.2 e. 1.5

    asked on March 26, 2010
  82. A.P. Economics

    What is the connection between incentives and consumer sovereignty in a free market economy?

    asked on September 5, 2009
  83. calculus

    Use division of power series to find the first three terms of the Maclaurin series for y = sec x.

    asked on August 1, 2011
  84. cis

    I have to find three errors and ther two logic and syntax error. HELP ME IN IT AND Below is code. Rem ===========BEGIN SAMPLE CODE============ REM Read 9 scores and report the average Dim score(10) For i = 1 to 10 CALL fillArray PRINT "The average score is

    asked on February 25, 2011
  85. physics

    A 10 kg block slides up a hill to a height of 5.8 m. If 414 J of thermal energy are generated, how fast was the block going at the bottom of the hill? 1 m/s

    asked on December 9, 2010
  86. phy

    A 12N force is applied to a 20kg door If a frictional torque is present what will be the angular acceleration of the door The door is 80cm wide and I=1/3ml^2.

    asked on October 23, 2010
  87. PHYSICS

    Starting from a pillar, you run a distance 200 m east (the + x-direction) at an average speed of 5.0 m/s, and then run a distance 280 m west at an average speed of 4.0 m/s to a post. Q: Calculate your average velocity from pillar to post.

    asked on August 31, 2010
  88. phy

    A horse canters away from its trainer in a straight line, moving 140 m away in 16.0 s. It then turns abruptly and gallops halfway back in 5.0 s. (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the

    asked on August 26, 2010
  89. soc

    .Question 26 Marks: 2 ____________ is an example of non-material culture, and __________ is an example of material culture. Choose one answer. a. cars; trains b. the music you hear in a club; ideas about love c. clothes; paintings d. ideas about love;

    asked on June 16, 2010
  90. algebra

    Simplify: sqrt()80/16 a) sqrt()5/4 b) sqrt()4/5 c) sqrt()5 d) sqrt()4 a

    asked on June 5, 2010
  91. chm152

    Consider the equilibrium of water with gaseous hydrogen and oxygen: Give the value of for this reaction, if it is written as: Choose one answer. a. -7.8 x 10^-16 b. -3.9 x 10^-16 c. 1.3 x 10^-15 d. 6.4 x 10^-14 e. 3.6 x 10^2

    asked on March 27, 2010
  92. Physics

    i)A boy of 45kg is 5m above a swimming pool on a spring board. The boy jumps up into the air which is 2m above the spring board before falling into the water. What is the maximum depth the boy can reach in the water if the average resisting force of water

    asked on June 15, 2016
  93. biology

    1.Briefly explain the evolution of limb orientation and the effects of limb posture on support and locomotion. 2.The transition from the aquatic to the terrestrial environment resulted in what kind of evolutionary changes in the girdles of tetrapods? Why

    asked on September 16, 2013
  94. Stor 155

    a report on the assets of american households says that the median net worth of the U.S. families is $120,300. The mean worth of these families is $556,300. What explain the difference between these two measures of center?

    asked on August 28, 2012
  95. anthropology

    Incest- why cannot we sleep with our brother?

    asked on July 11, 2011
  96. anthropology

    mechanism of natural selection( heritability, variation, differential reproductive success) how it works with behavioral examples

    asked on June 21, 2011
  97. phy

    Two point charges have a total charge of 525 µC. When placed 1.15 m apart, the force each exerts on the other is 25.7 N and is repulsive. What is the charge on each? (Round your answers to the nearest µC.)

    asked on January 21, 2011
  98. phy

    does the mass of the object have a direct effect on the buoyant force or does the volume? Which of the two has no affect on the buoyant force?

    asked on November 5, 2010
  99. PHY

    Two objects attract each other gravitationally with a force of 3.5 10-10 N when they are 0.33 m apart. Their total mass is 4.0 kg. Find their individual masses. A)larger mass kg B)sMaller mass kg

    asked on September 19, 2010
  100. physics

    A rock is thrown from the roof of a building with a velocity v at an angle of alpha from the horizontal. The building has height h. You can ignore air resistance. Calculate the magnitude of the velocity of the rock just before it strikes the ground

    asked on September 10, 2010

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