Physics for Scientists and Engineers: Foundations and Connections
Physics for Scientists and Engineers: Foundations and Connections
15th Edition
ISBN: 9781305289963
Author: Debora M. Katz
Publisher: Cengage Custom Learning
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Chapter 39, Problem 1PQ
To determine

The reason that Foucault pendulum hits all the pegs in 24h.

Expert Solution & Answer
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Answer to Problem 1PQ

The Foucault pendulum hits all the pegs in 24h because north Pole of Earth is not an inertial frame.

Explanation of Solution

The Foucault pendulum does oscillation in the Earth’s reference frame, which is continuously rotating about its axis. Earth make one complete rotation in 24hrs. As the Earth rotates pendulum also change its plane of oscillation and it goes all the way through each of pegs in one day of 24hrs, due to Coriolis force acting on it.

Pendulum is not going to change its plane of oscillation when it is placed in inertial frame. Therefore, it will hit only two opposite pegs.

Conclusion:

Therefore, Foucault pendulum hits all the pegs in 24h because north Pole of Earth is not an inertial frame.

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Chapter 39 Solutions

Physics for Scientists and Engineers: Foundations and Connections

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