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

    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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. algebra

    What number is used to complete the square for the equation x^2 + 5x = 0? a) 6.25 b) 25 c) 10 d) 2.5 a

    asked on June 8, 2010
  11. 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
  12. 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
  13. 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
  14. chm

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

    asked on June 27, 2010
  15. 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
  16. 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

    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
  18. 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
  19. 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
  20. Psychology

    How does astigmatism affect the way the perceptual system works?

    asked on April 18, 2019
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. chm

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

    asked on June 27, 2010
  27. 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
  28. 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
  29. 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
  30. biology

    what is burgess shale? what is the significance of this discovery to evolutionary biology

    asked on September 8, 2012
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. biology

    Briefly explain how the evolution of the pectoral girdle from the aquatic to the terrestrial environment gave rise to muscle differentiation and specialization in relation to the skull.

    asked on October 5, 2013
  41. Physics

    In a quality control test a steel ball with mass M falls a distance of H and bounces off a steel plate and through a hole in the wall into the ok bucket. If the ball bounces up a distance of 9/10H after hitting that plate and has a velocity of Vo at point

    asked on November 14, 2012
  42. 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
  43. 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
  44. Stor 155

    In computing the median income of any group, some federal agencies omit all members of the group who had no income. Give an example to show that the reported median income of a group can go down even though the group becomes economically better off. Is

    asked on August 30, 2012
  45. 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
  46. anthroplogy

    wht are the rich getting richer and the rest of us not? Use domestication emergence and social stratification to explain

    asked on July 12, 2011
  47. anthropology

    how same sex marriage define neo evolution theory.

    asked on July 8, 2011
  48. sociology

    Why lighter skins people thought that they are superior to all others.?

    asked on April 6, 2011
  49. sociology

    Does race effect the self esteem of children?

    asked on April 6, 2011
  50. physics

    This is my lab project and i need help in how to start to solve this problem. Determine the buoyant force on a balloon(filled with air) as a function of depth. At what depth does neutral buoyancy occur.

    asked on March 18, 2011
  51. phy

    In a capacitor, you have two plates, one is connected to a battery but other is not, how the other plate become charge ups.

    asked on February 7, 2011
  52. 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
  53. 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
  54. 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
  55. 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
  56. phy

    at what projection will the range of a projectile equal to 2 times its maximum height?

    asked on September 5, 2010
  57. 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
  58. algebra

    simplify: sqrt (16)/sqrt (4) + sqrt (2) a) 8 - 2 sqrt (2) b) 8 - sqrt (2) / 2 c) 2 d) 4 - 2 sqrt (2)

    asked on June 21, 2010
  59. algebra

    simplify the following radical expression: 3 sqrt (-27) a) 0 b) -3 c) 3 d) no solution exists

    asked on June 21, 2010
  60. mat 172

    solve the equation: arccosx+arccos2x=arccos1/2

    asked on March 30, 2010
  61. chm152

    At a particular temperature, Kc = 54 for the reaction H2(g) + I2 (g) 2 HI(g). One mole of HI is placed in a 3.0-L container. What would be the equilibrium concentration of HI? Choose one answer. a. 0.035 b. 0.071 c. 0.29 d. 0.30 e. 0.33

    asked on March 28, 2010
  62. 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
  63. 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
  64. 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
  65. 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
  66. World History

    The Master answered, ‘Never fail to comply.’ Fan Ch’ih was driving. The Master told him about the interview, saying, ‘Meng-sun asked me about being filial. I answered, “Never fail to comply.”‘ Fan Ch’ih asked, ‘What does that mean?’ The

    asked on October 7, 2019
  67. Geometry :)

    1) Segment CD has endpoints (-4, 3) and (8, -1). Find the coordinates of the point that divides the line segment directed from C to D in the ratio of 2:3. A) (6/5,26/5) B) (4/5,7/5) C) (1/5,13/5) D) (16/5,3/5) I would provide what I think the answer is-

    asked on September 21, 2019
  68. Math

    If I drive a rental car .45miles at 25.00 dollars per day and my other rental car .25miles at 40.00 per day how many miles must i drive for them to cost the same

    asked on January 9, 2017
  69. 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
  70. 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
  71. ChemistryPRELABS

    Mixtures of oxygen and nitrogen show almost ideal boiling behaviour. Nitrogen boils at 77.36 K and oxygen boils at 90.30 K. What is the boiling point of air?

    asked on November 9, 2015
  72. 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


    asked on May 14, 2014
  74. 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
  75. analytical chemistry

    compund x is known to absorb at 510nm. If you dilute a solution containing x by 1/4, by how much does the absorbance increase or decrease. if it stays the same just state it stays the same.why

    asked on March 26, 2013
  76. math

    i need help im stuck on this question please help me heres the input 25 and the output is 15

    asked on January 8, 2013
  77. statistics

    3. Consider selecting a starting line up for an intermural 6-on-6 indoor soccer team where you are required to have 4 students and 2 faculty on the court at all times. As everyone on your team have equal skills, you decide to randomly assign members to

    asked on October 15, 2012
  78. African American

    Amazing fact regarding African American in Randolph County

    asked on October 6, 2012
  79. African American

    Amazing fact regarding African American in Randolph County

    asked on October 6, 2012
  80. stor

    Recall the Prisoners problem from class. We have three prisoners (A, B, and C) on death row. The Governor will pardon one of the prisoners, and he tells the Warden who he chose, but the warden is not allowed to reveal who was pardoned. Lets switch things

    asked on September 29, 2012
  81. stor

    Suppose that you flip a fair coin (P(H)=P(T)=1 2 ) three times and you record if it landed on heads, H, or tails, T. (a) What is the sample space of this experiment? What is the probability of each event? (b) [1 pt] Let X be the number of times that you

    asked on September 29, 2012
  82. 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
  83. Stor 155

    Use the definition of the mean to show the sum of the deviation of the observations from their mean is always zero. This is one reason why variance and standard deviation use squared deviations.

    asked on August 30, 2012
  84. 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
  85. 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
  86. Math

    What does the net of a cube look like?

    asked on August 4, 2012
  87. biol

    How did tree productivity change over time in each of the forest stands, and how was productivity altered by N additions? Consider possible reasons to explain the pattern that you see in the data.

    asked on January 26, 2012
  88. 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
  89. business

    Can any one tell me any five legal issues in the movie "Catch me if you can"

    asked on January 12, 2012
  90. 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
  91. chemistry

    how to draw newman projection for different structure

    asked on September 11, 2011
  92. biology

    How to write an outline for scientific method experiment

    asked on September 8, 2011
  93. 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
  94. anthropology

    Incest- why cannot we sleep with our brother?

    asked on July 11, 2011
  95. anthropology

    What do languages tell us about migration? Draw a map (s) showing the different language families

    asked on July 2, 2011
  96. anthropology

    hominids characteristics and adaptation

    asked on June 27, 2011
  97. anthropology

    Australopithecines –why the variety and who were they

    asked on June 25, 2011
  98. anthropology

    provide explanation for human variation around the globe why we look and act differently from one another and what factors contribute it

    asked on June 22, 2011
  99. anthropology

    provide explanation for human variation around the globe why we look and act differently from one another and what factors contribute it

    asked on June 22, 2011
  100. anthropology

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

    asked on June 21, 2011


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