21. A ball having mass m is fas- tened at the end of a flagpole т that is connected to the side of a tall building at point P as shown in Figure P11.21. The length of the flagpole is l, and it makes an angle 0 with the x axis. The ball becomes loose [P and starts to fall with accelera- tion -gj. (a) Determine the angular momentum of the ball about point P as a function of time. (b) For what physical reason does the angular momentum change? (c) What is the rate of change of the angular momen- tum of the ball about point P? Figure P11.21

21. A ball having mass m is fas- tened at the end of a flagpole т that is connected to the side of a tall building at point P as shown in Figure P11.21. The length of the flagpole is l, and it makes an angle 0 with the x axis. The ball becomes loose [P and starts to fall with accelera- tion -gj. (a) Determine the angular momentum of the ball about point P as a function of time. (b) For what physical reason does the angular momentum change? (c) What is the rate of change of the angular momen- tum of the ball about point P? Figure P11.21

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter8: Momentum And Collisions

Section: Chapter Questions

Problem 22P: A tennis ball of mass mt is held just above a basketball of mass mb, as shown in Figure P8.22. With...

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A tennis ball of mass mt is held just above a basketball of mass mb, as shown in Figure P8.22. With their centers vertically aligned, both are released from rest at the same moment so that the bottom of the basketball falls freely through a height h and strikes the floor. Assume an elastic collision with the ground instantaneously reverses the velocity of the basketball while the tennis ball is still moving down because the balls have separated a bit while falling. Next, the two balls meet in an elastic collision. (a) To what height does the tennis ball rebound? (b) How do you account for the height in (a) being larger than h? Does that seem like a violation of conservation of energy? Figure P8.22
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