text: # Physics
  
  Here are the questions:
  1. A 0.45 kg book is resting on a dessktop 0.64 m high. Calculate the book's potential energy relative to
  a)the desktop? b)the floor.
  
  2. A 0.636 kg basketball has a potential energy of 19J at the basket. How high is the ball from the floor?
  
  3. A hockey puck has a potential energy of 2.3J when it is held by a referee at a height of 1.4 m above the rink surface. calculate the mass of puck?
  
  My solutions:(used Eg=mgh to get all solutions)
  1. a) 2.8J b) 0
  2. h=31m
  3. 0.6176 kg
  
  1. 👍
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  3. 👁
  1. I think you reversed the answers on 1.
  2. mgh=19
  h= 19/(.636*9.8) didn't you miss the decimal place?
  3. mgh=PE
  
  1. 👍
  2. 👎
  👤
  bobpursley
  2. when i divided 2.3/(1.4*9.8) i got 0.1676
  
  and for quesiton 1 do u mean that a) will be 0J sinse it is rest on the desktop and b) will be 2.8 J
  
  1. 👍
  2. 👎
  3. yes, and yes.
  
  1. 👍
  2. 👎
  👤
  bobpursley
  
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