Multiple Choice
According to Newton's law of universal gravitation, if the distance between two point masses is doubled while their masses remain constant, how does the magnitude of the gravitational force change?
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8. Centripetal Forces & Gravitation
Newton's Law of Gravity
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According to Newton's law of gravity, the Moon's gravitational pull produces how many high tides (tidal bulges) on Earth in approximately 24 hours?
A
Two
B
Four
C
Three
D
One
Verified step by step guidance1
Understand that the Moon's gravitational pull creates tidal bulges on Earth due to the differential gravitational force acting on different parts of the Earth.
Recognize that there are two tidal bulges: one on the side of Earth facing the Moon where the gravitational pull is strongest, and one on the opposite side where the pull is weakest, causing water to bulge outwards.
Know that as the Earth rotates once approximately every 24 hours, any given point on Earth passes through both tidal bulges.
Therefore, each location on Earth experiences two high tides in about 24 hours, corresponding to the two tidal bulges created by the Moon's gravity.
Conclude that the number of high tides produced by the Moon's gravitational pull in approximately 24 hours is two.
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