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-stretp0gkpy e9elnn9j+zny-.z r( 82aeyo8 ching belt to a wheel of radius 0.2 m (wheel B). The belt does not slip. If wheel B turnszpg8(y n2yn 0eo plze+r9ky8na je- .9 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 below ii1d1iw8 7b, *j 7hbwjz t; kkvevxxh.2s a snapshot of three cars all moving counterclockwise during a one lap race 8j7j , k17x2bhb whe;zixv w*ivtk.d1on 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 tf4ydwo *.iy, qrk( z9uhree cars all moving counterclockwise during a one lap race on ,.wq foyik*rd (y4u9 zan 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 1u rg 79c5ugx:v(rsiha snapshot of three cars all moving counterclockwise during a one lap race on an elliptical trr 7vuu:gcrh91x5(is gack.
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 c xl+k5kxedl.nygzy41kwbs4 19fo4 / uhoices best represents the average angular speed of the hour hand on a standard clock (in units of rad of4dx1k1/.ku45 yzsx gw 4lle9b +ykn/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 circular track one kilw9h klj8)0-r+ w ejfg e/czo1iometer in circumference. The first car can circle the track in 15 seconds at top speed while the second car can circle the track iwk w+9- )er1gehfjl8j0o zic/ n 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 must be metuyqdv bogd-:qgp0e5jqya8 ,k+ +d,9 s in order to use the rotational kinematics kabjud9 ,d++dq:y q, qoe8vy5pgs 0g- 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 .l-pdji5tp)f at a constant rate of 45 rev/min. What is the5ltpp dj-fi ). average angular 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 f 62k ps/y*dskrevolutions when coming to rest in 2.50 s. What was the initial a*kp 6df/syks 2ngular 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 clsu,czsd 0zu :ru:j. 7gock (in rad/s)?sdjuc :u.z z0r:u,g7s

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