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PHY 101 PHY 101 Past Questions Objective Question

Question

The gravitational force exerted by a uniform sphere on a particle outside the sphere is the same as if:
Options
A The entire mass of the sphere were concentrated at its center.
Correct Answer
B The particle's mass were concentrated at its own center.
C The sphere's mass were spread evenly over its surface.
D The force were zero.
Correct Answer

Option A is the correct answer.

Detailed Explanation

states that for a point outside a uniform sphere, the gravitational force is the same as if all the sphere's mass were concentrated at its center. This is a key result for treating celestial bodies as point masses.

Hint

This simplification allows us to use the point mass formula for planets and stars.

Question Info