A pendulum makes 6 swings every 10 seconds on Earth. You take the same pendulum and notice that the number of swings decreases on a different planet X. If the planet X has the same mass as the Earth, what else do you know about this planet X? a. The radius of Earth and Planet X must be the same b. The radius of Earth is larger than planet X c. None of the above d. The radius of planet X is larger than Earth

Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
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Author:Raymond A. Serway, John W. Jewett
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Chapter13: Universal Gravitation
Section: Chapter Questions
Problem 13.6OQ: An object of mass m is located on the surface of a spherical planet of mass M and radius R. The...
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A pendulum makes 6 swings every 10 seconds on Earth. You take the same pendulum and notice that the number of swings decreases on a different planet X. If the planet X has the same mass as the Earth, what else do you know about this planet X?

a. The radius of Earth and Planet X must be the same

b. The radius of Earth is larger than planet X
c. None of the above
d. The radius of planet X is larger than Earth
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