Motion with air resistance - 题库网 (tiku.one)

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1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.09: When a falling object reaches terminal velocin:w0g ltr*,+k:4 .:cc/ pbgkh jsb zocty, it:

A. is no longer subject to the friction of air.

B. moves downward with constant velocity.

C. has an acceleration of approximately $10\;m/s^{2}$

D. has no downward velocity.

E. has an upward acceleration.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.07: In the absence of air resistance, if an object were to fall freely near ticd*6p jx qja;yfap )cuz q.7:m35 e8zhe surface ofd 65m8jcpjqza. 7i fz q); *e:u3cpayx the Moon,

A. its velocity could never exceed 10 m/s.

B. its acceleration would gradually decrease until the object moves with a terminal velocity.

C. the acceleration is constant.

D. it will fall with a constant speed.

E. the acceleration is zero.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.09: If air resistance can be neglected, what happens to the horidca jju:4c z-wp gw+k8i/ *c:bzontal velocity component of a basketball as it is thrown to the basket from the free-throw linj8ccw /ai*+ -gbwp cjzku:d 4:e?

A. increases

B. decreases

C. decreases until the ball reaches the top then increases as the ball comes down

D. increases until the ball reaches the top then decreases as the ball comes down

E. remains constant

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.13: When a falling object moves with 8u2o08iwzc5yucrb 0q terminal velocity, it

A. has zero velocity.

B. has zero acceleration.

C. has an upward acceleration.

D. is no longer subject to air resistance.

E. has an acceleration of approximately 10 $m/s^{2}$ .

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.08: Why do raindrops fall 6vuuo. . ( qh-cpdn6ttwith constant speed during the later stages of their dd.qn u p6co-(6thtu.vescent?

A. The gravitational force is the same for all drops.

B. All drops fall from the same height.

C. The gravitational force is negligible for objects as small as raindrops.

D. The gravitational force cannot increase the speed of a falling object to more than 9.8 m/s.

E. Air resistance balances the gravitational force on a drop.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.14: An astronaut on the Moon simultaneousl/o2y2qun wwmio)ch465 9vkpmy drops a feather and a hammer. The fact that they m ho6/nkcw2opqm5)4vw9u 2yi
reach the surface at the same instant shows that

A. no gravity forces act on a body in a vacuum.

B. the acceleration due to gravity on the Moon is less than the acceleration due to gravity on the Earth.

C. the gravitational force from the Moon on heavier objects (the hammer) is equal to the gravitational force on lighter objects (the feather).

D. a hammer and feather have less mass on the Moon than on Earth.

E. in the absence of air resistance all bodies at a given location fall with the same acceleration.

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