Tides are caused because different parts of the Earth's oceans are at different distances from the Moon.
a. True
b. False
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[Ques. 2] Gravity acts over a limited distance range.
a. True
b. False
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[Ques. 3] As you go from a point where a gravitational field is strong to a point where the gravitational field gets weaker, the gravitational field lines get farther apart.
a. True
b. False
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[Ques. 4] The direction of a field line at a point in space shows the direction of the force that would act on a body placed at the point.
a. True
b. False
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[Ques. 5] Just above the surface of the Earth, the direction of the gravitational field is away from the Earth.
a. True
b. False
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[Ques. 6] Planetary orbits are circles.
a. True
b. False
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[Ques. 7] If a body were in orbit very near the surface of the Earth, its centripetal acceleration would be equal to g.
a. True
b. False
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[Ques. 8] A body on the surface of the Earth weighs 400 lb. The radius of the Earth is about 4,000 miles. If this same body were placed on a 4,000-mile high tower, its weight would be 200 lb.
a. True
b. False
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[Ques. 9] As you go higher and higher above the surface of the Earth, the mass of a body stays constant.
a. True
b. False
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[Ques. 10] A newton is larger than a pound.
a. True
b. False
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