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 teadzyd l( gpl8f/r5i9mg 9rf2 .rminal velocity, 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 air resistance, if an;xl3n-o)x:r gmay3xawqu 4 l5 object were to fall freely near thelx);rx ul3:5qa3y xo4wm an- g surface 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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99.09: If air resistance b27qjl+fpg+/ ss ri5gcan be neglected, what happens to the horizontal velocity component of a basketball as it is thrown to the basket from the free-thlsrsjgqg5+ 2 /p7 fbi+row 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 te3w vd5(wyb qc8m(aj t3rminal 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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05.08: Why do raindrops fall with constant speed durini dpgh l 5ou3 lde+;v;yhi724og the later stages of their dei ue;5;lh7+2oddolipy 4 3gvhscent?

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 simult:jos - zki67qhaneously drops a feather and a hammer. The fact that they kq:s hj-io z76
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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