Author Question: A pendulum bob swings to and fro as shown in the sketch. The kinetic energy of the bob 1) is ... (Read 88 times)

arivle123 · **on:** Jul 29, 2018

A pendulum bob swings to and fro as shown in the sketch. The kinetic energy of the bob

1) is maximum at position A,
2) is maximum at position B,
3) is the same at all positions,

and the potential energy is maximum at position
4) A.
5) B.
6) is the same at all positions.

Question 2

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?

1) 5 N
2) 50 N
3) 500 N
4) 5000 N

which is in accord with
5) Newton's second law.
6) that impulse equals change in momentum.
7) (F d) input = (F d) output.
8) mechanical energy can be stored as potential energy.