Figure E-3 -To Lift the 5000-N Block, the Man Finds That He

question 129

Multiple Choice

Figure E-3

-To lift the 5000-N block, the man finds that he must pull 10 m of rope through his hands for every 1 m the block rises. Neglecting the weights of the pulleys and friction, how hard must the man pull on the rope to raise the block?

• A)5 N
• B)50 N
• C)500 N
• D)5000 N Which is in accord with
• E)Newton's second law.
• F)that impulse equals change in momentum.
• G)(F × d)input = (F × d)output.
• H)mechanical energy can be stored as potential energy.

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