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-s*1c; ruyt ;v .vnbuxm8tretching belt to a wheel of radius 0.2 m (wheel B). The belt does not slip. If wheel B turns through 1 revolution, w8cux;n*b;t yvmruv1. heel 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 of three cars all moving couw: 3h4jkhrl:n w3 sc p/rx;5gdnterclockwise during a one lap r hrnlcr :ws5:k33wxd/; 4 pghjace 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 sna 6byzr(k;y4dr pshot of three cars all moving counterclockwise during a one lap race on an elliptica yr4z( y6;bdrkl 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 hzfff eme43 *i;ua vc25pc/o rwmd)(:ht.y9nthree cars all moving counterclockwise during a one lap race on an elli *5af(f4etm3 f;evcwnh9pyuh.z ic :o /drm)2ptical 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 represents the avez+l8f ml9csz iio4*l .rage angular speed of the hour hand on a m l4oli*8+ l.zcszif 9standard 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 circular track one kilometxn97r61lc gzh qfy0h/er 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 the6y/l 1g7cxhz 0n9r qhf 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 met in order tods p: tx4xem-, 8)lrzk use the rotational kine-sd8 ,kplr4x :)mzte xmatics 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* e2j(cz)+3knepq ,is dv0 v,aph1ew o by spinning at a constant rate of 45 rev/min. What is the 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 answ,ne1,2sk+v c3(av qze *weop0 idp) hjers 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 cttxr, wlp.oo a bs 0.*rfz7:w;m makes 3.5 revolutions when coming to rest in 2.50 s. Wht,z 7.0bow:.x;fo swltpra*r at was the 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 angular speed of t+i u1gzxu w9ccj-z,g22 1 xowwhe secondhand on a clock (in rad/s)?o+gw wxcxjzu-g9w12 2,i uzc1

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