Motion with air resistance - 无忧得胜-网上国际课程 (5edu.win)

?作业考试练习?美国物理杯赛(Physics Bowl)?Motion with air resistance

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习题练习：Motion with air resistance

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作者: admin 发布日期: 2024-07-30 13:01 总分: 6分得分: _____________

答题人: 游客未登录开始时间: 24年07月28日 14:36 切换到: 整卷模式

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96.09: When a falling object reaches terminal vel iii; cz)xuw -)j7;rtrocity, 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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99.07: In the absence of airf0;rsskfl.hsatnw5,gbdzn 1 3 ;-l8o resistance, if an object were to fall freely near the surface of the Moon3os8 saffsgz; w; rl ,d n.50l1ktn-hb,

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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99.09: If air resistance can be neglected, what happens to the horizontal 6pa fwg(yg5ht/w ij oz5xz 06-velocit0w66a hg5z -iowxj5g (/ ytpzfy component 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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98.13: When a falling object moves with terminal vel q6pc8rm ;q**rahfgo+ocity, 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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05.08: Why do raindrops fall with fmjv m87( 5obt/oi g(zconstant speed during the later stages of their descent ozf /5jmb(v8(7om igt?

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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05.14: An astronaut on the Moon simultaneously drops a feather and a/n4muj g/r)sd hammer. The fact mdgj)us4/n /r that 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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