Rotational basic parameter - 无忧得胜-网上国际课程 (5edu.win)

1#

05.11: A wheel of radius 0.1 m (wheel5uf-a ,l x* tvaujp 5u.)smki8 A) is attached by a non-stretching belt to a wheel of radius 0.*mfkv8,tpuu- .5xaj aul)s 5 i2 m (wheel B). The belt does not slip. If wheel B turns through 1 revolution, wheel A will rotate through

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

03.01: The diagram bo pinmo*66exqk3+6gb m0 7wzh elow is a snapshot of three cars all moving counterclockwise during a w6 hi0m7om n6k3b+ 6xpoqze* gone lap race on an elliptical track.
Which car has had the lowest average speed during the race so far?

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

03.02: The diagram below is a snapshot of three cars all movingwzm+t(ec km cvl)5;e3s y (py9 counterclockwise during a one lap race on an)t9c (mzc;ke+yls5w3vp (yem elliptical track.
Which car at the moment of the snapshot MUST have a net force acting on it?

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

03.03: The diagram below is a snapshot of three car nf;* jadb:gn7asln 6td-ze81s all moving counterclockwise during a one lap ran s lazg7;na1n f6d8jdb -et:*ce on an elliptical track.
Which car can finish the race without changing its present momentum?

A. carA

B. car B

C. car C

D. none of the three cars can finish the race with its present momentum

E. cannot be determined with information provided

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.25: Which one of the following choices best reavpjcu +k y8s8c,:u m4presents the average angular speed of the hour hand on a standardus84 y:p, mv+ caj8ukc clock (in units of rad/s)?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.40: Suppose two cars are racing on a circula/5u +fvl c rfw6n3b1dsr track one kilometer in circumference. The first car can circle the track in 15 seconds at top speed while the second car can circle the track in 12 seconds at top speed. How much lead does the first car need starting the last lap of the rasf/rlnw 3cf1vu +d65bce not to lose?

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

09.16: What condition must be met in order to use the rothh ) w(;o,osvbational kinemat(bwh,hv ;oso )ics equation $\Delta\theta=w_0t+\frac{2}{1}αt^{2}$

A. The angular acceleration is constant.

B. The angular velocity is constant.

C. The linear acceleration is zero.

D. The angular acceleration is zero.

E. There is no restriction on the use of this equation.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.32: A turntable plays a record by spinning at app ex;lq4p v/jwt*i3b ,.vlz t63mf6k constant rate of 45 rev/min. What is the average angullfvpp, 3m3e t/;4iwxqj*tlv6pz k6 b.ar acceleration of the record to reach this final angular speed, having started from rest, if it takes 8 seconds to do so? All answers are in units of rad/s2.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.18: A disk of radius 75.0 cm makes 3.5 reth5g b6b19 ctyvolutions when coming to rest in 2.50 s. What was b c91yh6g5 tbtthe initial angular speed of the disk?

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

08.12: What is the average anckapxk65gi2c2: *kqm gular speed of the secondhand on a clock (in rad/s)k65g: mkqiac*c2 pkx2?

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