A metal bar is hanging from a hook in the ceiling when it is suddenly struck by

Question

A metal bar is hanging from a hook in the ceiling when it is suddenly struck by a hall that is moving horizontally (see figure). The ball is covered with glue, so it sticks to the bar. During this collision A) the angular momentum of the system (ball and bar) is conserved about the hook because only gravity is acting on the system. B) the angular momentum of the system (ball and bar) is not conserved because the hook exerts a force on the bar. C) the angular momentum of the system (ball and bar) is conserved about the hook because neither the hook nor gravity exerts any torque on this system about the hook. D) both the angular momentum of the system (ball and bar) and its kinetic energy are conserved. 14) both the linear momentum and the angular momentum of the system (ball and bar) arc conserved. 13) A potter's wheel, with rotational inertia 46 kg middot m2, is spinning freely at 40 rpm. The potter drops a lump of clay onto the wheel, where it sticks a distance 12 m from the rotational axis. If the subsequent angular speed of the wheel and clay is 32 rpm what is the mass of the clay? A) 8.0 kg B) 5.4 kg C) 7.0 kg D) 9.8 kg E) 2.5 kg 14) Water flowing through a pipe suddenly comes to a section of pipe w here the pipe diameter decreases to 86% of its previous value. If the speed of the water in the larger section of the pipe was 36 m/s, what is its speed in this smaller section? A) 49 m/s B) 42 m/s C) 31 m/s D) 27 m/s

Explanation / Answer

The solution for 1:

1. B)

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