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Sqwill23 Sqwill23
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Posts: 618
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6 years ago
A Hooke's law spring is compressed 12.0 cm from equilibrium and the potential energy stored is 52.0 J. What is the spring constant in this case?
 a. 7 220 N/m
  b. 3 610 N/m
  c. 72.2 N/m
  d. 0.722 N/m
  e. No answer is correct.



[Ques. 2] By how much is the energy stored in a Hooke's law spring increased when its stretch is increased from 7.00 cm to 15.00 cm?
 a. 159
  b. 259
  c. 359
  d. 459
  e. The correct answer is not given.



[Ques. 3] The SI units for k, the spring constant, are equivalent to:
 a. J.
  b. J / N.
  c. kg / s2.
  d. None of the above.



[Ques. 4] A 2 500-kg ore car rolls 55.0 m down a frictionless 10.0 incline. If there is a horizontal spring at the end of the incline, what spring constant is required to stop the ore car in a distance of 2.10 m?
 a. 1.1E+5 kN/m
  b. 4.5E+5 kN/m
  c. 2.8E+6 kN/m
  d. 2.4E+5 kN/m
  e. 2.4E+4 kN/m



[Ques. 5] An amount of work equal to 2.0 J is required to compress the spring in a spring-gun. What is the launch speed of a 26.0-g marble?
 a. 12.4 m/s
  b. 13.4 m/s
  c. 8.8 m/s
  d. 3.92 m/s
  e. 0.392 m/s



[Ques. 6] A 2.50-kg projectile is launched at an angle of 20.0 above the horizontal with an initial speed of 100 m/s from the top of a building 40 m high. If the projectile is traveling 85.0 m/s at its maximum height of 47.0 m, how much work has been done on the projectile by air friction?
 a. 3.3E+3 J
  b. 1.7E+2 J
  c. 3.5E+3 J
  d. 2.4E+4 J



[Ques. 7] An Olympic skier moving at 19.5 m/s down a 17.0 slope encounters a region of wet snow, of coefficient of friction k = 0.740 . How far down the slope does she go before stopping?
 a. 56.7 m
  b. 46.7 m
  c. 56.1 m
  d. 36.7 m
  e. 37.4 m



[Ques. 8] A 60-kg (including the passenger) sled is subject to a net force of 20 N pushing in the direction of the sled's motion as it is moving over a horizontal surface for a distance of 11 m after having started from rest. At this point the sled is released as it starts down a 10.0 incline. However, the snow is not very deep, and the sled stops after having moved an additional 35 m. What is the work done by friction while the sled is on the incline?
 a. 3.6E+3 J
  b. 3.8E+3 J
  c. 3.4E+3 J
  d. 2.0E+4 J



[Ques. 9] A box is launched up a frictionless incline with an angle of elevation . The maximum height reached by the box is h. The box is again launched up the incline with the same initial speed it had before, but this time the angle of elevation has been increased to . How does the maximum height H reached this time by the box compare with the previous value h?
 a. H = h b. H > h
  c. H < h d. H = ((sin)/(sin))



[Ques. 10] A girl and her bicycle have a total mass of 42 kg. At the top of the hill her speed is 4.00 m/s. The hill is 14.3 m high and 112 m long. If the force of friction as she rides down the hill is 20 N, what is her speed at the bottom?
 a. 4.00 m/s
  b. 15.8 m/s
  c. 13.8 m/s
  d. 63.1 m/s
  e. She stops before she reaches the bottom.
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xstealthx08xstealthx08
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6 years ago
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Sqwill23 Author
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6 years ago
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