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Author Question: A 3.00-m long plank of negligible mass has a 30.0-kg mass at one end and a 40.0-kg mass at the other ... (Read 111 times)

cagreen833

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on: Jul 29, 2018
A 3.00-m long plank of negligible mass has a 30.0-kg mass at one end and a 40.0-kg mass at the other end. How far from the 30.0-kg mass should a fulcrum be placed so that the plank is balanced?
 
  A)
 
  1.71 m
 
  B)
 
  1.29 m
 
  C)
 
  0.750 m
 
  D)
 
  1.50 m
 
  E)
 
  2.25 m

Question 2

State the principle of conservation of mechanical energy
 
  What will be an ideal response?


lkoler

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

A

Answer to Question 2

If only conservative forces are doing work, the total mechanical energy of a system neither increases nor decreases in any process. It stays constant - it is conserved.


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