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

标记此题

1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.09: When a falling object reachesn/vu*qce r7om3k6 hsvc9l p*mbq*p3 / terminal 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.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.07: In the absence of air resistance, if an gs4 izs)ogv, .hk79dlobject were to fall freely near the s4s,g o7zh idv. 9lg)ksurface 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.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

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 t 1 26acbd 0s+d0w91mz1otihqd*pkrfto the horizontal velocity component of a basketball as it is thrown to the basket from the f a s9m1dwdri zhtd1k0 0t*1q6bo 2pcf+ree-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

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.13: When a falling object myjm*jk ,.r-j;xqiy04 ubx qz7m .oi: soves 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 $m/s^{2}$ .

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

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 duringzzs4sxzhi; .,m q 9gxn(cg:wzz05re bm7 9nj - the later stages of their des7r9sz-wx 4,bgsni( hmxc z jg n.0:5;e zzq9zmcent?

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.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.14: An astronaut on the Moonnec(22 jg9u 0.ba ( 2a2rrppn io3caqx simultaneously drops a feather and a hammer. The uacar orenic 02g p2n (qxj3a(29.2p bfact 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.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

账号		自动登录	找回密码
密码			立即注册

网页聊天 (离线可收发)

加微信咨询 (申请一对一课程辅导，加本站学习交流群）

电话咨询：

联系管理员：

查看帮助：

未使用图片

本次作答已使用