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 (wheel A) is attached by a non-stret916/onj g o9 lqr2yb anu2nz4p+ 6zbmkching belt to a wheel of radius 0.2 m (wheel B). The belt does not slip. If wheel B turns through 1 revolutiyp2 grznu/l1 onnb 4 aq 9+o9mkjz6b26on, 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 below is a snapshot ofsyr0elv+d 8 e;cdk 6:xs* t*pf three cars all moving counterclockwise dulf;k*p8 dc d 0ss6xe:re *yvt+ring a one 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 siwqe5p jvv+3 /:cggy1napshot of three cars all moving counterclockwise during a one lap race on an elliptical trac3gc ivej:w5gyq1p/ v +k.
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 all moving counterclockwxtx (1ter i70jgn:b3pise during a one lap race on an 7 30en(xtp1g:t jb xrielliptical 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 pqw/ fq hg 9(agqbfsm4b +3 ,gj1+w(cbbest represents the average angular speed of the hour hand on a standard clock (in units of rad/s)?p3wgs( qhg,(91gqjm4q /fb++bf bc wa

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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 qvzu n)g/-q xy.7kddf vnayjh6f;e+9f6g/-aon a circular track one kilometer in circumference. The first car can circle the track in 15 sg-f7x -dan)jyd z/ hf vu/qky;f6.9n+qa6egv econds 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 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 conditio( nkwtrh ,e6z8jma2.7jyhx - bn must be met in order to use the rotational kinematizr6yjk( 72nw - htaxb.,m8 hjecs 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 a constant rate 3o9c32q m7wnm dkdfb:op tv 67of 45 rev/min. What is the average angular acceleration of the record to reach this fina6dbom3kv7 2qn9d: p 3tm7fwo cl 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 revolutions when2ltcdhl * v;6x coming to rest in 2.50 s. What was the init*hlxc6 2t dlv;ial 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 angular speed of the secondhand on a clock s;vigk2 )a7-+0o eooql6rx s j(in rad/s)ejg+xoo0-;q i6)asks rvl o72?

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