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Author Question: A box of mass m is pressed against (but is not attached to) an ideal spring of force constant k and ... (Read 88 times)

piesebel

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on: Jul 29, 2018
A box of mass m is pressed against (but is not attached to) an ideal spring of force constant k and negligible mass, compressing the spring a distance x.
 
  After it is released, the box slides up a frictionless incline as shown in the figure and eventually stops. If we repeat this experiment with a box of mass 2m
 
  A) the lighter box will go twice as high up the incline as the heavier box.
  B) just as it moves free of the spring, the lighter box will be moving twice as fast as the heavier box.
  C) both boxes will have the same speed just as they move free of the spring.
  D) both boxes will reach the same maximum height on the incline.
  E) just as it moves free of the spring, the heavier box will have twice as much kinetic energy as the lighter box.

Question 2

The work performed as a function of time for a process is given by where What is the instantaneous power output at
 
  A) 99 W
  B) 69 W
  C) 139 W
  D) 208 W


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31809pancho

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: A

Answer to Question 2

Answer: A


piesebel

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Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


31809pancho

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Reply #3 on: Jul 29, 2018
Great! Please up vote :D


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