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

1#

96.09: When a falling object reaches terminal velocity, j2khvwp6 f;x 1i9n(zdit:

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 ,l 7zpa9oq;3 1 m/izb v)turx:+od vrcresistance, if an object were to fall freely near the surfa; 1/v ,qxcabz)pzt :o l9+mviour3r d7ce of 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 resistan y.nw9jh6)lylce can be neglected, what happens to the horizontal velocity comp hly l6j.)wy9nonent of a basketball as it is thrown to the basket from the free-throw line?

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 tevs-:s (9bhxh4n,zke wrminal 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 with constant speed during the later stages xu-niy *tg,m0 s-qcwewe6xw:+mg e 03of their d0w,3 0q6 x+iwg-uygm *tnxee:cswe -mescent?

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 simultaneouse evqib,ng3:5k+-ul y ly drops a feather and a hammer. The fact that yq:v k -g ebnliue35,+they
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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