The Atwood’s machine shown consists of two blocks of mass m1m1 and m2m2 that are connected by a light string that passes over a pulley of negligible friction and negligible mass. The block of mass m1m1 is a distance h1h1 above the ground, and the block of mass m2m2 is a distance h2h2 above the ground. m2m2 is larger than m1m1. The two-block system is released from rest. Which of the following claims correctly describes the outcome after the blocks are released from rest but before the block of m2m2 reaches the ground? Select two answers.     For the system consisting of the two blocks, the change in the kinetic energy of the system is equal to the work done by gravity on the system. For the system consisting of the two blocks, the change in the kinetic energy of the system is equal to the work done by gravity on the system. A For the system consisting of the two blocks, the change in kinetic energy of the system is equal to the sum of m1gh1+m2gh2m1gh1+m2gh2. For the system consisting of the two blocks, the change in kinetic energy of the system is equal to the sum of m1gh1+m2gh2. B For the system consisting of the two blocks and the pulley, the increase in kinetic energy of the system is equal to the decrease in the gravitational potential energy of the system. For the system consisting of the two blocks and the pulley, the increase in kinetic energy of the system is equal to the decrease in the gravitational potential energy of the system. C For the system consisting of the two blocks, the pulley, and Earth, the change in the total mechanical energy of the system is zero.

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The Atwood’s machine shown consists of two blocks of mass m1m1 and m2m2 that are connected by a light string that passes over a pulley of negligible friction and negligible mass. The block of mass m1m1 is a distance h1h1 above the ground, and the block of mass m2m2 is a distance h2h2 above the ground. m2m2 is larger than m1m1. The two-block system is released from rest. Which of the following claims correctly describes the outcome after the blocks are released from rest but before the block of m2m2 reaches the ground? Select two answers.

 
 
  • For the system consisting of the two blocks, the change in the kinetic energy of the system is equal to the work done by gravity on the system.

    For the system consisting of the two blocks, the change in the kinetic energy of the system is equal to the work done by gravity on the system.
    A
  • For the system consisting of the two blocks, the change in kinetic energy of the system is equal to the sum of m1gh1+m2gh2m1gh1+m2gh2.

    For the system consisting of the two blocks, the change in kinetic energy of the system is equal to the sum of m1gh1+m2gh2.
    B
  • For the system consisting of the two blocks and the pulley, the increase in kinetic energy of the system is equal to the decrease in the gravitational potential energy of the system.

    For the system consisting of the two blocks and the pulley, the increase in kinetic energy of the system is equal to the decrease in the gravitational potential energy of the system.
    C
  • For the system consisting of the two blocks, the pulley, and Earth, the change in the total mechanical energy of the system is zero.

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