Physics Unit8: Rotational Motion

1#

Angular displacement is usually expre /x7jayb tg zp)zf.d, w5zgn)/ss in units of (1.0 分)

A. meters.

B. radians.

C. revolutions.

D. arcs.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

2#

单选题搜藏此题

Angular velocity is expressed in ej*i foz. l/4p.gzkufh0)u:u. +uzjap 57e wpunits of (1.0 分)

A. meters per second.

B. radians per second.

C. omegas per second.

D. arcs per second.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

3#

单选题搜藏此题

Angular acceleration is expressed in uniti1ul x0ivas7sj t0, ;itv.mt+t 7 wu3ss of (1.0 分)

A. meters per second squared.

B. radians per second squared.

C. alphas per second squared.

D. arcs per second squared.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

4#

单选题搜藏此题

A boy and a girl are riding on a mg; 0q;xd 1h0q b8jp kclb8wzl5erry-go-round which is turning at a constant rate. The boy is near the outer edge, and the girl is closer to the center. Who has the greater angularj08qq5;hdc1xlg w 8 zblk;p0b displacement? (1.0 分)

A. the boy

B. the girl

C. Both have the same non-zero angular displacement.

D. Both have zero angular displacement.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

5#

单选题搜藏此题

A boy and a girl are riding on a merry+/ il8tcie3 nd-go-round which is turning at a constant rate. The boy is near t83d/cn+et i lihe outer edge, and the girl is closer to the center. Who has the greater angular speed? (1.0 分)

A. the boy

B. the girl

C. Both have the same non-zero angular velocity.

D. Both have zero angular velocity.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

6#

单选题搜藏此题

A boy and a girl are riding on a merry-go-round which iszubtjy0ms9g h*i:ulr9w7 :mb1( vhc 7 turning at a constant rate. The boy is near the outer edg:v u79lzji uyhrb 7cmbms0 :*(gh tw91e, and the girl is closer to the center. Who has the greater linear speed? (1.0 分)

A. the boy

B. the girl

C. Both have the same non-zero translational velocity.

D. Both have zero translational velocity.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

7#

单选题搜藏此题

A boy and a girl are riding a merry-ge+)yqe o5jeudhuexe.o 9 95 *ko-round which is turning at a constant rate. The boy is nqk5.juyedehxo e9e9 )e*o+ 5uear the outer edge, while the girl is closer to the center. Who has the greater centripetal acceleration? (1.0 分)

A. the boy

B. the girl

C. Both have the same non-zero centripetal acceleration.

D. Both have zero centripetal acceleration.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

8#

单选题搜藏此题

A boy and a girl are riding a merry-go-round which is turning at a constant ratenq)o(m:yf;4 s 1tsqi x. The boy is near the outer edge, while the girl is closer to the center. Who has the greater tanq4mso1sn)yf ; xq :ti(gential acceleration? (1.0 分)

A. the boy

B. the girl

C. Both have the same non-zero tangential acceleration.

D. Both have zero tangential acceleration.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

9#

单选题搜藏此题

Consider a rigid body that is rotatingmc3 bt-)f/a:9mdl cx-w pr .cg. Which of the following is an accurate statemecg:c b wdpxt/)3-m9lr -mac. fnt? (1.0 分)

A. Its center of rotation is its center of gravity.

B. All points on the body are moving with the same angular velocity.

C. All points on the body are moving with the same linear velocity.

D. Its center of rotation is at rest, i.e., not moving.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

10#

单选题搜藏此题

Rolling without slip4 0pk4ls e::eo ud8hutt 8bs.aping depends on (1.0 分)

A. kinetic friction between the rolling object and the ground.

B. static friction between the rolling object and the ground.

C. tension between the rolling object and the ground.

D. the force of gravity between the rolling object and the Earth.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

11#

单选题搜藏此题

Two equal forces are applied to a door. Th04ocl aio1()) 7mt gbke4wu cle first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forcee0 lb)74 cwuoik tocma41)lg (s are applied perpendicular to the door. Which force exerts the greater torque? (1.0 分)

A. the first at the midpoint

B. the second at the doorknob

C. both exert equal non-zero torques

D. both exert zero torques

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

12#

单选题搜藏此题

Two equal forces are appliew2n(u :ordrjyq,n;5 e/ex co9d to a door at the doorknob. The first force is applied perpendicularudq2 coweno,(rn9r /:5yxe; j to the door; the second force is applied at $30^{\circ}$ to the plane of the door. Which force exerts the greater torque? (1.0 分)

A. the first applied perpendicular to the door

B. the second applied at an angle

C. both exert equal non-zero torques

D. both exert zero torques

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

13#

单选题搜藏此题

Two forces are applied to a doorknob, perpendicular to the dom6/sw6xqqq qs.k,q)u or. The first force is twice as large as the second force. The ratio of the torque of the first to the torque of the seckw.q/q 6u)s6qxsm qq,ond is (1.0 分)

A. 1/4.

B. 1/2.

C. 2.

D. 4.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

14#

单选题搜藏此题

What is the quantity used q8dn4ne)4w ./vmmphy to measure an object's resistance to changes in rotatihmdm y wnq/e npv44.8)on? (1.0 分)

A. mass

B. moment of inertia

C. torque

D. angular velocity

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

15#

单选题搜藏此题

Consider two uniform solid spheres whernm)e5;hj;qd b2iqn--df/ckv9 vi mc: e both have the same diameter, but one has twice the mass of the otherc i9vn;/d:bef5i )m h; q qmdjc--nkv2. The ratio of the larger moment of inertia to that of the smaller moment of inertia is (1.0 分)

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

16#

单选题搜藏此题

Two uniform solid sp. zfy9f(j3ew9qc . c 3gijle,hjcv. h4heres have the same mass, but one has twice the radius of the oth( j,.y9icgc h. j39 e4ezjhwl.vqfc3fer. The ratio of the larger sphere's moment of inertia to that of the smaller sphere is (1.0 分)

A. 4/5

B. 8/5

C. 2

D. 4

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

17#

单选题搜藏此题

Consider two uniform solid spheres where one has t) gw0 z3qsvs8p. f-etkwice the mass and twice the diameter of the other. ke .wp-gq3sv0tf ) zs8 The ratio of the larger moment of inertia to that of the smaller moment of inertia is (1.0 分)

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

18#

单选题搜藏此题

A uniform solid sphere has mass M and radius R.fc9o 2swj:p1u4bmlm0 If these are increased to 2M and 3R, what happens to theb2 4cw1:jp0mmu l9ofs sphere's moment of inertia about a central axis? (1.0 分)

A. increases by a factor of 6

B. increases by a factor of 12

C. increases by a factor of 18

D. increases by a factor of 54

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

19#

单选题搜藏此题

If a constant net torque is applied2g 9rh.b n6wva74v5 pmrdxt)w to an object, that object will (1.0 分)

A. rotate with constant angular velocity.

B. rotate with constant angular acceleration.

C. having an increasing moment of inertia.

D. having a decreasing moment of inertia.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

20#

单选题搜藏此题

The moment of inertia of a solid cylinder about its axis is given by 0.5 m w6vi sa:a+8p k:mg1e1-djszMR2. If this cylinder rolls without slipping, the ratio of its rotationak11j 6:avm: z-pdsma isw8+ge l kinetic energy to its translational kinetic energy is (1.0 分)

A. 1:1

B. 1:2

C. 2:1

D. 1:3

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

21#

单选题搜藏此题

Consider a motorcycle of mass 150 kg, one wheel of which itj v(lk:b,i, lay;5v p 8ngt0has a mass of 10 kg and a radius of 30 cm. What is the ratio of the rotational kinetic energy of the wheels to the total translational kinetic energy of the 5iitp:yakllbvgn ,j t( 80,;vbike? Assume the wheels are uniform disks. (1.0 分)

A. 0.033:1

B. 0.067:1

C. 0.33:1

D. 0.67:1

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

22#

单选题搜藏此题

Suppose a solid sphere of mass Mw2 ;i)0c4( wagcpnh8a hbln j;y*5aig and radius R rolls without slipping down an incline8b yc 0ga54jaii2w( l hp*)wcn;ga;hnd plane starting from rest. The linear velocity of the sphere at the bottom of the incline depends on (1.0 分)

A. the mass of the sphere.

B. the radius of the sphere.

C. both the mass and the radius of the sphere.

D. neither the mass nor the radius of the sphere.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

23#

单选题搜藏此题

Suppose a solid sphere v) cnqo18o/x.uqh/e nof mass M and radius R rolls without slipping down an inclined plane starn1)c e8.n/oo qvq/ uhxting from rest. The angular velocity of the sphere at the bottom of the incline depends on (1.0 分)

A. the mass of the sphere.

B. the radius of the sphere.

C. both the mass and the radius of the sphere.

D. neither the mass nor the radius of the sphere.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

24#

单选题搜藏此题

"The total angular momentum of a system of particles changes3 yxm/ iljp8u; when a net external force acts on the system." This stayjmx3p;l/ i u8tement is (1.0 分)

A. always true.

B. never true.

C. sometimes true. It depends on the force's magnitude.

D. sometimes true. It depends on the force's point of application.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

25#

单选题搜藏此题

In what circumstances can the angular velocity of system of particle*u):lu3 l - 2brmozyk g8enpkf8 s(sf3s change without any chang seo-(283yf *n: kp kl)fsgulmrb3zu8e in the system's angular momentum? (1.0 分)

A. This cannot happen under any circumstances.

B. This can happen if a net external force acts on the system's center of mass.

C. This can happen if the only forces acting are internal to the system.

D. This can happen if an external net torque is applied properly to the system.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

26#

单选题搜藏此题

The Earth orbits the Sun in an elliptical orbit. Ignore any friction whi0g iy51vg)n :xj f7lqcch may be present. What happens over time to the 7 n5)0:1 yilqjv cxfggEarth's angular momentum about the Sun? (1.0 分)

A. It continually increases.

B. It continually decreases.

C. It remains constant.

D. It increases during some parts of the orbit, and decreases during others.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

27#

单选题搜藏此题

The Earth moves about the Sun in an elliptical orbit. As the Earth mmu 5fv-7e fcu15gvf39 lpo1ga oves close to the Sun, then which of the follof3af 1 7f59gl5gpvume 1-voucwing best describes the orbiting speed of the Earth about the Sun? (1.0 分)

A. increases

B. decreases

C. remains constant

D. none of the above

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

28#

单选题搜藏此题

An ice skater performs a pirouette (a fast spin) by pullyxmih 83r)*f g)dcb) fing in his outstretched arms close to hi)) m3 irfhf )yd*gxb8cs body. What happens to his angular momentum about the axis of rotation? (1.0 分)

A. It does not change.

B. It increases.

C. It decreases.

D. It changes, but it is impossible to tell which way.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

29#

单选题搜藏此题

An ice skater performs a pir+nh/r+lfrpb ox 7o+0 xouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his rotational kineticb+on xlx+0fhr rp/7o+ energy about the axis of rotation? (1.0 分)

A. It does not change.

B. It increases.

C. It decreases.

D. It changes, but it is impossible to tell which way.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

30#

单选题搜藏此题

An ice skater performs a pirouette (a fast spin) by pulli,b7pj w9clk2 y7* wmsek (v:myng in his outstretched arms close to his body. What happens to his moment of inertia about the axis of*(pmy2b7 w ce7w ky9kml ,jv:s rotation? (1.0 分)

A. It does not change.

B. It increases.

C. It decreases.

D. It changes, but it is impossible to tell which way.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

31#

问答题搜藏此题

State the law of conservation of angular momentu/y)jclp5/7 qez 0i/uzn czr,qm. (1.0 分)

该题自我估分: (必填) (满分:1.0分)

绑定到本题的附件链接:
绑定到本题的上传图片: (问答题类型题目图片/附件必须插入上方文本框，否则会被移除题目绑定)

参考答案:

进入本题讨论区，参与讨论

标记此题

32#

单选题搜藏此题

What arc length does the Earth travel in a three month period in its nearfak/+i6jt,yy waol7 c+l :f/ ely circular orbit about the Salfy,c:aolyfi k+ +je/6t w/7un with a radius of $1.5 \times 10^{11} \; m$? (1.0 分)

A. $1.2 \times 10^{11} \; m$

B. $1.8 \times 10^{11} \; m$

C. $2.4 \times 10^{11} \; m$

D. $3.0 \times 10^{11} \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

33#

单选题搜藏此题

The second hand of a fb3f6f4ltpk64pt o c5 clock has a length of 0.30 m. What distance does the tip of the second hand sweep through in 3 minul544cbot6tpk6f 3 fpftes and 45 seconds? (1.0 分)

A. $1.1 \; m$

B. $1.8 \; m$

C. $7.1 \; m$

D. $13 \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

34#

单选题搜藏此题

How many rad/s is 25 revolutions per minute equi7p du bud uk33uo88qr 1m,5hyqvalent to? (1.0 分)

A. 0.42 rad/s

B. 2.6 rad/s

C. 160 rad/s

D. 240 rad/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

35#

单选题搜藏此题

A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 slzv1td ci(*k1po i4(wv(+vcbhy3 qt-;4mi bh. What is the frequency of the wheel's rotation(bkw(hvobtlt1 ;p iy4hc qv z1+dv34ic-*im (? (1.0 分)

A. $0.50 \; Hz$

B. $1.0 \; Hz$

C. $2.0 \; Hz$

D. $4.0 \; Hz$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

36#

单选题搜藏此题

A pulsar (a rotating neutron star) emits pulses at a free5a k( 3+bg 0adu. osux5uzi/tquency of 0.40 kHz. The per.uu(k/z degsb5oaui+ atx305 iod of its rotation is (1.0 分)

A. 2.5 ms.

B. 2.5 s.

C. 0.025 s.

D. 25 ms.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

37#

单选题搜藏此题

A phonograph record rotates at 45 rpm. Through what angle does it turn in 0.20/x8 ,tb7b n +ztb.zbxb s. 8t zb/7xtznx,bbbb +? (1.0 分)

A. $9.0^{\circ}$

B. $15^{\circ}$

C. $54^{\circ}$

D. $96^{\circ}$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

38#

单选题搜藏此题

A wheel of diameter 26 cm turns at 1500 rpq 5dkw+ ulkyyu-.+b* nm. How far will a point on the outer rim movek.b5+wy uqy *n -ud+lk in 2.1 s? (1.0 分)

A. $3.1 \; m$

B. $41 \; m$

C. $90 \; m$

D. $180 \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

39#

单选题搜藏此题

A bicycle wheel rotates uniformly through 2.0 revolutiq.fh;dzd1qrkrz7nf * m 9q d c/70d,apons in 4.0 s. What is the average angular speed /7nh mra.f kd 1cp;zqqqd 9dr*7fzd,0of the wheel? (1.0 分)

A. 0.79 rad/s

B. 1.6 rad/s

C. 3.1 rad/s

D. 6.3 rad/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

40#

单选题搜藏此题

A bicycle wheel rotates uniformly through 2.0 ifv;/,.vtem dmjs 05n revolutions in 4.0 s. What is the linear speed of a point 0.10 m froe/n 0f vvjt ,ds5i;mm.m the center of the wheel? (1.0 分)

A. 0.63 rad/s

B. 0.31 rad/s

C. 0.16 rad/s

D. 0.079 rad/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

41#

单选题搜藏此题

A cable car at a ski resort carries skiers a distance of 7 (5foc45cahmmfm.8ko.z r yv6.8 km. The cable which moves the car is driven by a pulley with diameter 3.0 m. Assuming no slippage, how fast must the pulley rotate for the cm 8f7m.fhv(5ooac4 c m5z kry.able car to make the trip in 12 minutes? (1.0 分)

A. $9.4 \; rpm$

B. $30 \; rpm$

C. $60 \; rpm$

D. $720 \; rpm$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

42#

单选题搜藏此题

A wheel of radius 1.0 m is rotating with a constant angular speed of 2.0 ralf -ufg:o)xi /x1 zf+gd/s. What is the linear speed of a pointu )g:ffzx/-go1 ixl+f on the wheel's rim? (1.0 分)

A. 0.50 m/s

B. 1.0 m/s

C. 2.0 m/s

D. 4.0 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

43#

单选题搜藏此题

The cutting cord on a gas-powered weed cutter is 0.16 m in lenuv*ab.-d /bu sgth. If the motor rotates at the rate of 20 rev/s/.s-bavb d* uu, what is the approximate linear speed of the end of the cord? (1.0 分)

A. 20 m/s

B. 25 m/s

C. 35 m/s

D. 65 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

44#

单选题搜藏此题

A wheel of radius 1.0 m is rotating with a constav w/8jn)18vdze 7r;vzr:t slhnt angular speed of 2.0 rad/s. What is the centripetal acceleration of az z 8;sd7vnv)wt: rr81vl he/j point on the wheel's rim? (1.0 分)

A. $0.50 \; m/s^2$

B. $1.0 \; m/s^2$

C. $2.0 \; m/s^2$

D. $4.0 \; m/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

45#

单选题搜藏此题

What is the centripetal acceleration yh ,qnn0*+btag:y83pywzif 9of a point on the perimeter of a bicycle wheel of diameter 70.0 cm when the bike is ag+3 p:whnyifn8,*yyt b z q90moving 8.00 m/s? (1.0 分)

A. $91.0 \; m/s^2$

B. $183 \; m/s^2$

C. $206 \; m/s^2$

D. $266 \; m/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

46#

单选题搜藏此题

How many revolutions per minute (rpm) must a circular, rotating space stiyf d,yfc)jf0)-q f ;tation (r = 1000 m) rotate to produce an artificial gravity fq, ;ifjtcf0)d-yfy) of $9.80 \; m/s^2$? (1.0 分)

A. $0.95 \; rpm$

B. $0.83 \; rpm$

C. $0.075 \; rpm$

D. $0.094 \; rpm$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

47#

单选题搜藏此题

A car is negotiating a flat circular curve of radius- )dh;p:xjvr ry h2z ksji:*-t 50 m with a speed of 20 m/s. The maximum centripetal force (provided j-;*:i)p2:xhty d zrs hr vk-jby static friction) is $1.2 \times 10^{4} \; N$. What is the centripetal acceleration of the car? (1.0 分)

A. $0.40 \; m/s^2$

B. $0.80 \; m/s^2$

C. $4.0 \; m/s^2$

D. $8.0 \; m/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

48#

单选题搜藏此题

A car is negotiating a flat circular curve of radius 50 m with a speed of 20 m/sxe/qhr ar brf 52nyj/3i.rl* ;. The maximum y3 xjl rnr/ra e/*q5h r2fi.;bcentripetal force (provided by static friction) is $1.2 \times 10^{4} \; N$. What is the mass of the car? (1.0 分)

A. $0.50 \times 10^{3} \; kg$

B. $1.0 \times 10^{3} \; kg$

C. $1.5 \times 10^{3} \; kg$

D. $2.0 \times 10^{3} \; kg$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

49#

单选题搜藏此题

A 0.300-kg mass, attached to thenpwvv a+iy ,h03t r/ 83yjocpo:kyme1.k kz4- end of a 0.750-m string, is whirled around in a smooth level table. If the maximum tension that the string can withstand is 250 N, then what maximum linei ypr 4k 1:e -jc hvmzn,v+0ypak83. kot/o3wyar speed can the mass have if the string is not to break? (1.0 分)

A. 19.4 m/s

B. 22.4 m/s

C. 25.0 m/s

D. 32.7 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

50#

填空题搜藏此题

A bowling ball of mass 7.5 kg and radiu ho9s;t(m/iyuzd h4 4rs 9.0 cm rolls without slipping 10 m down a lane at 4.3 t44o;dy r9(z hmi/uhs m/s.
(a) Calculate the angular displacement of the bowling ball.   rad ( fill in numbers only)
(b) Calculate the angular velocity of the bowling ball   rad/s ( fill in numbers only)
(c) Calculate the radial acceleration of the bowling ball    $m/s^2$ ( fill in numbers only)
(d) Calculate the tangential acceleration of the bowling ball    $m/s^2$ ( fill in numbers only) (1.0 分)

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

51#

单选题搜藏此题

A wheel accelerates with a constant angular accelerati/foscr56q ;8 )mpnypo:xje- gon of $4.5 rad/s^2$. If the initial angular velocity is 1.0 rad/s, what is the angle the wheel rotates through in 2.0 s? (1.0 分)

A. $11 \; rad$

B. $9.0 \; rad$

C. $7.0 \; rad$

D. $4.5 \; rad$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

52#

单选题搜藏此题

A wheel accelerates with a constant angular accele:sr1vbdun nutjx/ -chw /(;u:ration of $4.5 rad/s^2$. If the initial angular velocity is 1.0 rad/s, what is the angular velocity at t = 2.0 s? (1.0 分)

A. 1.0 rad/s

B. 7.0 rad/s

C. 9.0 rad/s

D. 10 rad/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

53#

单选题搜藏此题

How many radians does a 0.300-m radius automobiq g(4u wece6.ile tire rotate after starting from rest and acceleraee 4(g.6uiwqcting at a constant angular acceleration of $2.00 \; rad/s^2$ over a 5.00-s interval? (1.0 分)

A. $1.00 \; rad$

B. $2.00 \; rad$

C. $12.5 \; rad$

D. $25.0 \; rad$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

54#

单选题搜藏此题

A wheel starts at rest, and has an angular acrh 3akkbw*2 )vceleration of $4 \; rad/s^2$. Through what angle does it turn in 3.0 s? (1.0 分)

A. $36 \; rad$

B. $18 \; rad$

C. $12 \; rad$

D. $9.0 \; rad$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

55#

单选题搜藏此题

A Ferris wheel rotating at 20 rad/s decelerates with a constantjjblze8h8a8pl/o7 l nj l5j6 ik,+0lr angular acceleration li8hjj88/ljepalbl60orn7 5l,+ zkjof $-5.0 \; rad/s^2$. How many revolutions does it rotate before coming to rest? (1.0 分)

A. 40

B. 20

C. 6.4

D. 3.2

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

56#

单选题搜藏此题

A wheel starts from rest and reaches an ih. noxi vv 1qtfht 1.er3 00j+xe2204wdardfangular speed of 6.0 rad/s while turning through 2.0 revolutions. What is +.h n2 eo014rtxqvfjhtife0dr.a wx v130i 2dthe average angular acceleration of the wheel? (1.0 分)

A. $0.24 \; rad/s^2$

B. $1.4 \; rad/s^2$

C. $3.0 \; rad/s^2$

D. $9.0 \; rad/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

57#

单选题搜藏此题

A wheel of diameter of 68.0 cm slows down uniformly f6hqrb4l-: 0 ayim jso/nc;d0q ,1cltwrom 8.40 m/s to rest over a distance of 115 m. What is the totadn, 6:;/c oi 4lqj 1- rqscwthbylm0a0l number of revolutions the wheel rotates in coming to rest? (1.0 分)

A. $53.8 \; rev$

B. $26.9 \; rev$

C. $338 \; rev$

D. $169 \; rev$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

58#

单选题搜藏此题

A wheel of diameter o3f f/3jfj r kukm)wlnpz9;y5*f 68.0 cm slows down uniformly from 8.40 m/s to rest over a distancezf)m/fk3r; nwjlu yjf *9 5p3k of 115 m. What is the angular acceleration? (1.0 分)

A. $-1.80 \; rad/s^2$

B. $-0.90 \; rad/s^2$

C. $-5.65 \; rad/s^2$

D. $-11.3 \; rad/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

59#

单选题搜藏此题

A wheel of diameter of 68.6 li:od. jmw16mbews l1bpw:10 cm slows down uniformly from 8.40 m/s to rest over a distance of 115 m. How long does it take for the whee s1 m.:o wdmbil lb16e6:p1wjwl to come to the stop? (1.0 分)

A. $24.7 \; s$

B. $27.4 \; s$

C. $42.7 \; s$

D. $47.2 \; s$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

60#

填空题搜藏此题

A centrifuge in a medical laboratory rotates at (m+n nk fh5 a+4a)jykaa rotational speed of 3600 rev/min. Wk(fy+am5n +k4an a)j hhen switched off, it rotates 50.0 times at a constant angular acceleration before coming to rest.
(a) Determine the initial angular speed of the centrifuge.    $rad/s$
(b) Determine the angle (in radians) through which the centrifuge rotates before coming to rest.    $rad$
(c) Calculate the constant angular acceleration of the centrifuge.    $rad/s^2$
(d) Calculate the time necessary for the centrifuge to come to rest.    $s$ (1.0 分)

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

61#

单选题搜藏此题

The bolts on a car wheel require tightening to a torque of 90 h;) qzkv8 bvl7 3oql(nNm. If a 30 cm long wrench is used, what is the magnitude of the force q b)v 73k8no;h(zllvq required when the force applied at $53^{\circ}$ to the wrench? (1.0 分)

A. $190 \; N$

B. $380 \; N$

C. $19 \; N$

D. $38 \; N$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

62#

单选题搜藏此题

A wheel with moment of inertia of. 39gzleo. oqnh0,k-ybu c;$3.00 kgm^{2}$ has a net torque of 3.50 Nm applied to it. What angular acceleration does it experience? (1.0 分)

A. $0.857 \; rad/s^2$

B. $1.17 \; rad/s^2$

C. $3.00 \; rad/s^2$

D. $3.50 \; rad/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

63#

单选题搜藏此题

A triatomic molecule is modeled as fol2 tc6xoee,9silows: mass m is at the origin, mass 2m is at x = a, and, mass 3m is at x = 2a. Wha926oe ixt sce,t is the moment of inertia about the origin? (1.0 分)

A. $2 ma^2$

B. $3 ma^2$

C. $12 ma^2$

D. $14 ma^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

64#

单选题搜藏此题

A solid cylinder of mass 10 kg is pivoted about a frictionle7/r ar 8nnxw5 blywi29 8z5uouiu1 mn0ss axis thought the center O. A rope wrapped around the outer radius R1 = 1.0 m, exerts a force F1 = 5.0 N to the right. A second rope wrapped around another section of radius R2 = 0.50 m exerts a force F2 = 6.0 N downward. (See Fig. below) What is the angular acceleration of the cy 5n02r 8n1x9u ib7rlu anwy58zwim /uolinder?

(1.0 分)

A. $1.0 \; rad/s^2$

B. $0.60 \; rad/s^2$

C. $0.40 \; rad/s^2$

D. $0.80 \; rad/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

65#

单选题搜藏此题

A solid cylinder of mass 10 kg is pivoted about a frp1 l t6q xg ,w/bpc6-t*fbe4clictionless axis thought the center O. A rope wrapped around the outer radius R1 = 1.0 m, exerts a force F1 = 5.0 N to the right. A second rope wrapped around another section of radius R2 = 0.50 m exerts a force F2 = 6.0 Ne bqgcb6fp ,wc tl/p6-*x1l4t downward. How many radians does the cylinder rotate through in the first 5.0 seconds, if it starts from rest? (1.0 分)

A. $13 \; rad$

B. $7.5 \; rad$

C. $5.0 \; rad$

D. $10 \; rad$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

66#

单选题搜藏此题

A 4.00-m long rod is hinged at one end. The rod is initially )wqa9uiu :hd/p ,yl )zheld in the horizontal position, and then rele9 pd/zaywiu l):,uqh) ased as the free end is allowed to fall. What is the angular acceleration as it is released? (The moment of inertia of a rod about one end is ML2/3.) (1.0 分)

A. $2.45 \; rad/s^2$

B. $3.68 \; rad/s^2$

C. $4.90 \; rad/s^2$

D. $6.75 \; rad/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本Practice全部题目来源于WebAssign，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

67#

单选题搜藏此题

Consider a bicycle wheel to be a ring of radius 30 cm andvom9z2j j df y /i88fz7li0e5r mass 1.5 kg. Neglect the mass of the axle and sprocket. If a force of 20 N is applied tangentially to a sprocket of radius 4.0 cm for vdmj28 5e 7l if/fzji9zy08or4.1 s, what linear speed does the wheel achieve, assuming it rolls without slipping? (1.0 分)

A. 3.0 m/s

B. 5.9 m/s

C. 7.1 m/s

D. 24 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

68#

单选题搜藏此题

A 1.53-kg mass hangs on a rope wrapped around a frictio-ew /n/ myk1z eehm:790pmlxnnless disk pulley of mass 7.07 kg and radius 66.0 xzpmky: m/1em7e/hewnn9 l -0 cm. What is the angular acceleration of the pulley? (1.0 分)

A. $4.49 \; rad/s^2$

B. $7.98 \; rad/s^2$

C. $9.87 \; rad/s^2$

D. zero

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

69#

单选题搜藏此题

A 1.53-kg mass hangs on a rope wrapped around a frictionless disk pulley of m58p1hjc gjxj )so;;a ep 9ygb fc/(.vtass 7.07 kg and radius 66.0 cm. What is thej;g sbfj j8v(x;) /.5ec19h gcaopytp acceleration of the mass? (1.0 分)

A. $9.26 \; m/s^2$

B. $2.96 \; m/s^2$

C. $6.29 \; m/s^2$

D. zero

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

70#

单选题搜藏此题

A rotating flywheel can be used to store energy. If it is re9v4 (ad(q -axl pd+42i;fglc ,wutzkxquired to store $1.00 \times 10^{6} \; J$ of energy when rotating at 400 rad/s, what is the moment of inertial of the wheel in $kgm^{2}$? (1.0 分)

A. 6.25

B. 12.5

C. 25.0

D. 50.0

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

71#

单选题搜藏此题

A wheel of moment of inert*+8umy b0 jgdxz-wrtze68 om 8ia of $5.00 \; kgm^{2}$ starts from rest and accelerates under a constant torque of 3.00 Nm for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s? (1.0 分)

A. $57.6 \; J$

B. $64.0 \; J$

C. $78.8 \; J$

D. $122 \; J$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

72#

单选题搜藏此题

A solid sphere of mass 1.0 kg and radius 0.010 m starts from rest andx; iq6hm s12)-xvz9p8roq z:q1mshld rolls without slipping down a 1.0-m high inclined plane. What is the speed of the sphere whe2i; xhxsmmoq8qq lh9 s-:zz) pv6dr11 n it reaches the bottom of the inclined plane? (1.0 分)

A. 3.7 m/s

B. 4.4 m/s

C. 5.6 m/s

D. 6.3 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

73#

单选题搜藏此题

A solid sphere of mass 1.0 kg x.,inzr56e nrbls 9 ,gand radius 0.010 m rolls with a speed of 10 m/s. How high up an inclinrb9nnil,ex.sr, 6 gz5ed plane can it climb before coming to rest? (1.0 分)

A. $0.071 \; m$

B. $0.71 \; m$

C. $7.1 \; m$

D. $71 \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

74#

单选题搜藏此题

A hoop of radius 0.50 m and a mass of 0.20 kg is released frffo 55fqei v*.om rest and allowed to roll down an inclineqfv*i5.of5ef d plane. How fast is it moving after dropping a vertical distance of 3.0 m? (1.0 分)

A. 2.2 m/s

B. 3.8 m/s

C. 5.4 m/s

D. 7.7 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

75#

问答题搜藏此题

A solid sphere of mass 1.5 kg and radius 15 cm rolbpre;96qtj 8mls without slipping down a 35e incline that is 7.0 m long. Assume it started from rest. The ;q e96 pjb8rtmmoment of inertia of a sphere is given by $I = (2/5)MR^2$.
(a) Calculate the linear speed of the sphere when it reaches the bottom of the incline.
(b) Determine the angular speed of the sphere at the bottom of the incline.
(c) Does the linear speed depend on the radius or mass of the sphere? Does the angular speed depend on the radius or mass of the sphere? (1.0 分)

该题自我估分: (必填) (满分:1.0分)

绑定到本题的附件链接:
绑定到本题的上传图片: (问答题类型题目图片/附件必须插入上方文本框，否则会被移除题目绑定)

参考答案:

进入本题讨论区，参与讨论

标记此题

76#

单选题搜藏此题

An object's angular momentum c0 g;5mfzz5i5u*cr2ansl, ugjhanges by $20 \; kgm^{2}/s$ in 4.0 s. What magnitude average torque acted on this object? (1.0 分)

A. $2.5 \; N \cdot m$

B. $5.0 \; N \cdot m$

C. $40 \; N \cdot m$

D. $80 \; N \cdot m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

77#

单选题搜藏此题

A proton of mass $1.67 \times 10^{-27} \; kg$ rotates with an angular speed of 2 x 106 rad/s in a circle of radius 0.80 m in a cyclotron. What is the orbital angular momentum of the proton? (1.0 分)

A. $1.28 \times 10^{-21} \; kg \cdot m^{2}/s$

B. $1.76 \times 10^{-21} \; kg \cdot m^{2}/s$

C. $2.14 \times 10^{-21} \; kg \cdot m^{2}/s$

D. $3.20 \times 10^{-21} \; kg \cdot m^{2}/s$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

78#

单选题搜藏此题

An ice skater has a mom 5) k8iuom(towent of inertia of $5.0 \; kgm^{2}$ when her arms are outstretched. At this time she is spinning at 3.0 revolutions per second (rps). If she pulls in her arms and decreases her moment of inertia to $2.0 \; kgm^{2}$, how fast will she be spinning? (1.0 分)

A. $2.0 \; rps$

B. $3.3 \; rps$

C. $7.5 \; rps$

D. $10 \; rps$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

79#

单选题搜藏此题

A figure skater rotating at 5.00 rad/s with ar v0dqgu,q19xl.1;eije*bh y qms extended has a moment of inerti; 1beyx dhqgue*il., q9q j0v1a of
$2.25 \; kgm^{2}$. If the arms are pulled in so the moment of inertia decreases to $1.80 \; kgm^{2}$, what is the final angular speed? (1.0 分)

A. 2.25 rad/s

B. 4.60 rad/s

C. 6.25 rad/s

D. 0.81 rad/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

		Remember me	Forgot password?
Password			Register Now

Unused Images

Used Images in Current Log

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79