A В M Mass = 2 Mass = M An Atwood's machine consists of two blocks connected by a light string that passes over a set of ideal pulleys, as shown above. Blocks A and B have masses M and M, respectively. The blocks are released from rest and block B moves downward with an acceleration of magnitude a. Next, a block of mass M is attached to block A, and the system is again released from rest. Which of the following gives the change in acceleration of block B?
A В M Mass = 2 Mass = M An Atwood's machine consists of two blocks connected by a light string that passes over a set of ideal pulleys, as shown above. Blocks A and B have masses M and M, respectively. The blocks are released from rest and block B moves downward with an acceleration of magnitude a. Next, a block of mass M is attached to block A, and the system is again released from rest. Which of the following gives the change in acceleration of block B?
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Transcribed Image Text:A boy stands in a large bucket used to lift humans to higher elevations. The combined weight of the boy and bucket is W. The bucket has a lightweight rope attached to its top and extending up and over a simple pulley that is attached to the ceiling high above the boy. The rope is long enough to come back down to his hands, as shown. As the boy pulls himself
upward, he applies a force Fto the rope. Which of the following claims indicates a correct relationship between F and Wand provides appropriate reasoning?
F<W, because as the boy exerts a force downward on the rope, the tension in the rope is pulling up on the boy and up on the bucket.
F<W, because as the boy exerts a force downward on the rope, the tension in the rope pulls up on the boy. This is in addition to the normal force the bucket exerts on the boy, thus reducing the force needed to pull the boy upward.
F<W, because as the boy exerts a force downward on the rope, the tension in the rope pulls up on the boy, which reduces his weight
F = W, because as the boy exerts a force downward on the rope, the tension in the rope pulls up on the boy.
E)F>W, because as the boy exerts a force downward on the rope, the tension in the rope pulls up on the boy. Plus, the boy must overcome the friction in the pulley.
Transcribed Image Text:В
Mass =
2
Mass = M
An Atwood's machine consists of two blocks connected by a light string that passes over a set of ideal pulleys, as shown above. Blocks A and B have masses M and M,respectively. The blocks are released from rest and block B moves downward with an acceleration of
magnitude a. Next, a block of mass M is attached to block A, and the system is again released from rest. Which of the following gives the change in acceleration of block B?
A) A decrease of 9
в
A decrease of g
An increase of g
D
A decrease of 9
An increase of 9
A
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