College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A bowling ball is suspended from the ceiling of a lecture hall by a strong cord. The ball is drawn away from its equilibrium position and released from rest at the tip of the demonstrator’s nose, as shown in Figure CQ5.6. (a) If the demonstrator remains stationary, explain why the ball does not strike her on its return swing. (b) Would this demonstrator be safe if the ball were given a push from its starting position at her nose?



To determine
Why the ball does not strike the girl on its return even though she was on her position stationary.

initially, when the girl drawn away the ball from its equilibrium and keep it near the tip of her nose, the gravitational potential energy that the ball is having is,


  • m is the mass of the ball
  • g is acceleration due to gravity
  • h is the height from earth to the ball

When she releases the ball, the gravitational potential energy will change to kinetic energy of the ball


To determine
Would the demonstrator is safe if she give a push to the ball in its initial state near her nose.

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