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Author Question: A 4.0-kg block is lowered down a 37 incline a distance of 5.0 m from point A to point B. A ... (Read 103 times)

Starlight

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on: Jul 28, 2018

A 4.0-kg block is lowered down a 37 incline a distance of 5.0 m from point A to point B. A horizontal force (F = 10 N) is applied to the block between A and B as shown in the figure. The kinetic energy of the block at A is 10 J and at B it is 20 J. How much work is done on the block by the force of friction between A and B?
 
   


   
  a.
  58 J
   
  b.
  53 J
   
  c.
  68 J
   
  d.
  63 J
   
  e.
  47 J

Question 2

A force acting on an object moving along the x axis is given by Fx = (14x  3.0x2) N where x is in m. How much work is done by this force as the object moves from x = 1 m to x = +2 m?
   
  a.
  +12 J
   
  b.
  +28 J
   
  c.
  +40 J
   
  d.
  +42 J
   
  e.
  28 J


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GCabra

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Reply #1 on: Jul 28, 2018
Answer to Question 1

c

Answer to Question 2

a


Starlight

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Reply #2 on: Jul 28, 2018
Both answers were spot on, thank you once again


GCabra

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Reply #3 on: Jul 28, 2018
Great! Please up vote :D


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