3. A pith ball of mass 1.0 x 10-5 kg with a positive charge of 4.0 × 10-7 C is slowly pulled at a constant speed by a string a distance of 50.0 cm through a potential difference of 8.0 x 10² V. It is then released from rest and "falls" back to its original position. (a) Calculate the work done by the string in moving the pith ball. (b) Calculate the magnitude of the average force required to do this work. (c) Calculate the kinetic energy of the pith ball when it arrives back at its original position.

3. A pith ball of mass 1.0 x 10-5 kg with a positive charge of 4.0 × 10-7 C is slowly pulled at a constant speed by a string a distance of 50.0 cm through a potential difference of 8.0 x 10² V. It is then released from rest and "falls" back to its original position. (a) Calculate the work done by the string in moving the pith ball. (b) Calculate the magnitude of the average force required to do this work. (c) Calculate the kinetic energy of the pith ball when it arrives back at its original position.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter19: Electric Potential And Electric Field

Section: Chapter Questions

Problem 7PE: Integrated Concepts A lightning bolt strikes a tree, moving 20.0 C of charge through a potential...

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