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 termin o.s.dgr z.at7al 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 air resisto5b s2ood:peo4uk+h z d6e6 aqfz,:--eq/oz cance, if an object were to fall freely near the c:q,z fooak 4qpedzo6: h2b6+z eo/ue-ods 5-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 resistance can be neglected, what happens tnbc* yai+5.9 ej-y7debvl *y zo the horizontal velocitb+9yciv*- 75 yy.de*anzel b jy 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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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 terminal ve t2 yxvmn/ qyco4*5cr/rqct6e r a645dlocity, 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 l v/eff49 h9llicxu9 2iater stages of their des fi92cvf9h4ex9 lilu /cent?

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 ther gvoots8n0)2j. dea 3 e ,uewdt,+u3i Moon simultaneously drops a feather and a hammer. Thee2.s, 8u)+eot3juat,w ei3ondd g 0rv fact 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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