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 (w3 ie-lx,p1h hnheel A) is attached by a non-stretching belt to a wheel of radius 0.2 m (wheel B). The belt does not slip. If wheel B turns through 1 revolution, wheel en1hxip,l3-h 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 below is a snapshot og qh:.bd:qr 0c9v bgwvoyk: 3.f three cars all moving counterclockwise during a one lap3. h:k:qv.bcd0o: vqyrwb gg9 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 tpcj4 ewk8tbc.x 9/t1whree cars all moving counterclockwise during a one 1jx9 kc/cb.pe4tt ww8lap race on an 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 cars wv pr994erx) 0- cgtwl7f,iyeall moving counterclockwise during a one gwi 7w 0lrv9) e9pcy4xtre-, flap race 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 ,yk3kys3eu3p represents the average angular speed of the houe sk3u,p3ky 3yr hand on a standard 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 circulayeefj w chl-+eu/o3bsh 09uk+7ux j-5r track one kilometer in circumference. The first car can circle the track in 15 seconds at top speed while the seceel+b5 7hkjuu 30wcxf -9ye o/+u-jhsond 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 race 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 musta)/gzg5 ihil0 fc; of33*apsm be met in order to use the rotational kinematics eh/siz0)ioac m;5 3p*gafl3f gquation $\Delta\theta=w_0t+\frac{2}{1}αt^{2}$

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 a constant rate of 45 rev/min. f na) ,5p4d89 jwnlj9,faisdw What is the average an95)l,4djdfia jw sw p89nfa,ngular 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 75mkhl0o /i57 tw(:ikwd.0 cm makes 3.5 revolutions when coming to rest in 2.50 s. What was the initial angular speed of t: /h(57okwliimkwd 0the 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 angular speed of the secondhand on43(qcd vwnzi, a clock (in rad/s)?w (cv,nz34qd i

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