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

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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 te nv (+)t l8is7qw+olvhrminal 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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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.07: In the absence of 2 jed zufc4ut273k+,6bqkuuo air resistance, if an object were to fall freely near t4 6 kuz cuu7qeduj3k,2 +of2bthe 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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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.09: If air resistancezupg q0 3*d.tq can be neglected, what happens to the horizontal velocity component of a basketball as it is thrown to the basket from q0. d *3qzptugthe 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 moveo-9y75o gtyoet xwlv 4 x-3eu2s with 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 raindrd g(a7io *-j/sfe+o,okyd 8 seops fall with constant speed during the later stages of their *sike,( de-+og78d y /sja oofdescent?

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 simultaneously drops a feather al-: ax,1x s fa;)photuxx io-+nd a hammer. The fact t:, fopx1x)i-aol huas;xx +t-hat 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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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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