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Author Question: A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P ... (Read 131 times)

sam.t96

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on: Jul 28, 2018

A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B?
 
   


   
  a.
  2.7 J
   
  b.
  1.0 J
   
  c.
  2.2 J
   
  d.
  1.6 J
   
  e.
  3.2 J

Question 2

The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. What is the change in mechanical energy done on the system during this time interval by the frictional force on the 2.0 kg mass?
 
   


   
  a.
  12 J
   
  b.
  17 J
   
  c.
  20 J
   
  d.
  8.0 J
   
  e.
  28 J


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ebonylittles

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

c

Answer to Question 2

d


sam.t96

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Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

yeungji

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Reply 3 on: Yesterday
Gracias!

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