VCE Physics Practice Questions - VCE Physics Units 3 & 4 (VCAA) Exam

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Which of the following best describes how the magnitude of the gravitational field strength g varies with distance r from the center of a uniform spherical planet of mass M and radius R, for positions outside the planet (r >= R)?

g is directly proportional to r. g is inversely proportional to r. g is inversely proportional to r squared. g is constant regardless of distance r.

Correct Answer:

g is inversely proportional to r squared.

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