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习题练习:Physics Unit8: Rotational Motion



 作者: admin发布日期: 2024-05-18 15:22   总分: 80分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月27日 13:55  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Angular displacement is usualfh4qrxr+/zy r,c3i1: phmh 6 aly express in units of

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Angular velocity is expressed in unitj p/0 l )tq2zg2+f26woibnovrs of

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Angular acceleration is expressed in unit 8z*/ kx-gj ,7rt.* ;l kfjdndnilew8ws of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boy and a girl are riding on a merry ew + c9u 3o.-/;kht nfpwpk/ndwmqs95-go-round which is turning at a constant rate. The boy is near the outer edge, and the girl is dpuknno59s;www ./f em+9ktq/- cp 3hcloser to the center. Who has the greater angular displacement?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boy and a girl are riding on a merry-go-round which is turning aue2x a*dq19bn t a constant rate. The boy is near the outer edge, and the girl is closer toua 2d*enb91 qx the center. Who has the greater angular speed?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boy and a girl are rid, xv41tf:jd4yv. zyj t/aoaet39q *gding on a merry-go-round which is turning at a constant rate. The boy is near ,a jqedzj4 ya* 3.1voxd/ftttvg9 y: 4the outer edge, and the girl is closer to the center. Who has the greater linear speed?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boy and a girl are riding a merry-go-round which ,x0 8n*kx3 cpm/ha6lt:idnh nis turning at a constant rate. The boy is near the ox0*ncikl3d h/ m,8pa txn:6hnuter edge, while the girl is closer to the center. Who has the greater centripetal acceleration?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boy and a girl are riding a merry-goa r))pt3v5cm4w x8649i s 7yw/hzuntd,txp vo -round which is turning at a constant rate. The boy is near the outer edge, while the girl is closer to the center. Whoz pat)8 ow3h4m v9d,57t)/ yn is4rwt6xuxpvc has the greater tangential acceleration?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a rigid body that is rotating. Which of7pp+w rbd b9g2 the following is an accurate statement7r9 wb2bd p+pg?

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Rolling without slipping :8qwpe2 t2c ib6 y6cvcdepends on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two equal forces are applied to a 3zkcx0tv9n1s y5 4hzs door. The first force is applied at the midpoint of the door; t9zt0 vz ssc3hy1nx5k 4he second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two equal forces are applied mz8u3xw hmnew1v v,.f 2w,jy/b la0:zto a door at the doorknob. The first force is applied perpendicular to the door; the second force is applied at 30e to the plane ofvwmvbw , 8hm,u l1fyzja./ zx3w2n:0e the door. Which force exerts the greater torque?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two forces are applied to a doorknob, perpendicular to the door. Thv; n8 zgtfq3,ee first force is twice as large as the second force. The ratio of the torque of v;t3gn,e qz8 fthe first to the torque of the second is

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the quantity used to measure an object's resistance to chpmot (1iz xx/w kx.(rp thu :9)be:l7wanges in rotation?rbux97.1k):i /(eh pz(xtx w: powtml

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two uniform solid spheres where both have 6quv8s2 py:.: *vxvcu(pt5w2funf(n eb rs0uthe same diameter, but one has twictfvrv (*8qn s. puu2u0p( c ux:fwb625vnes :ye the mass of the other. The ratio of the larger moment of inertia to that of the smaller moment of inertia is

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two uniform solid spheres have the 2: ih wkhmzz24same mass, but one has twice the radius of the other. The ratio of the lz242h wmh ikz:arger sphere's moment of inertia to that of the smaller sphere is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two uniform solid spheres where one has twice thqwmjhl ysy))hq; 1. /hy*fr2le mass and twice the diameter of the other. The ratio of th; .y1/yw )lj*qq)yhr fslh2 mhe larger moment of inertia to that of the smaller moment of inertia is

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A uniform solid sphere has mass M and radius R. If these are increasedk8zok+d0j8-req rb o2,g9n ice hd 5.k to 2M and 3R, what happens to the sphere's mome5o2 e +c8dokdzngkkjqhib,9 8r-0.re nt of inertia about a central axis?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a constant net torque is applied to an mlvg- ccique,. ft)1 ;object, that object will

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The moment of inertia of a solid cylinder about its axis is given by 0.5 MR2. (miy1k;kx r,z)fu+0hgk 1 vr g If this cylinder rolls without slipping, the ratio of its rotational kinetic energy to its translational kinetic energy isuv 1kk)m0 k1ixyr(r+gh,;g fz

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a motorcycle of mass 150 kg, one wheel of wh)nb ;+g e8g7gfb d90eavm x3qeich has a mass of 10 kg and a radius of 30 cm. What is the ratio of the rotational 7;xndgb vf8 q+3ega mg)9ebe0kinetic energy of the wheels to the total translational kinetic energy of the bike? Assume the wheels are uniform disks.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a solid sphere of mass ui +kswc7 y4sa*b+e+rM and radius R rolls without slipping down an inclined plane starting from rest. The linear velocity of the sphere at the bottom of the incline c 4ri7b+y a +*ws+kseudepends on

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a solid sphere of mass M and radius R rolls without ud y1n8 vhd,*+;hfzlefff2t 0slipping down an inclined plane starting from rest. The ang8f1f n+vl2edt;u,f0zh fdhy*ular velocity of the sphere at the bottom of the incline depends on

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  "The total angular momentum of a syl6z3 u iqr8lp bcnr qy.)e8et(;,ek ;estem of particles changes when a net external force acts on the system." This statkeu;qp b ct 8e, r.y(qe8)l;rz6e3nliement is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In what circumstances can the angular 2hz4utr:kn+c *p gw 2uvelocity of system of particles change without any change in uu2z :n*r cp +4wthgk2the system's angular momentum?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Earth orbits the Sun in an elliptical orbia+ lu6ku6ratf)6din h 5l5r6qt. Ignore any friction which may be present. What happens over time to the Earth's angular mi)daf5 l6 ku+ 56qaunrthl6r6omentum about the Sun?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Earth moves about the Sun in an elliptical orbit. As the Earti e s4-66 te;m1l(s6ywtnph csh moves close to the Sun, then which of the followingyt6m4p-;hc1(s et ew6s isl6n best describes the orbiting speed of the Earth about the Sun?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ice skater performs a pirouette (a fast spin) by pullio/ hls7lofk )wm8(;tqdtq izn dn; 1*5ng in his outstretched arms close to his body. What happens to his angular momentud) lz;h(mdtk; 7q/sonl58ow inf *t1qm about the axis of rotation?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ice skater performs a pirouette (a fast spin) by pull-gl r.wn e*b5g(:xnrqing in his outstretched arms close to his body. What happens to his rotat:b.xegn ql 5r*r n(-wgional kinetic energy about the axis of rotation?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ice skater performs a pirouette (a fast spin dp:2rs j83w2afo+kzc*)vaep) by pulling in his outstretched arms close to his body. What happens to his mome2vep +*r8 2das3)f:z cawjkopnt of inertia about the axis of rotation?

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31#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of consen-6/xm:u z5yf*wbrn prvation of angular momentum.
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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What arc length does the Earth travel in a three month period in its nc+wl5 b o91tks/r ruw-early circular orbit about the Sun wr9-ur l/s5+bko w w1ctith a radius of $1.5 \times 10^{11} \; m$?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The second hand of a cloc +qtr1 u5pcxy5k has a length of 0.30 m. What distance does the tip of the second hand sweep through in 3 minutes and 45 se x+5upytq 1r5cconds?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many rad/s is 25 revolutions per minute equivalent t cyh44 tuj8e 5u)sp+qpo?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bicycle wheel rotates unsp;fu78 u(gkaln; fv+ iformly through 2.0 revolutions in 4.0 s. What is the frequencf kap7(nvu f;;8gul s+y of the wheel's rotation?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pulsar (a rotating neutron star) emits pulses al13nrea2an t,v 8. msft a frequency of 0.40 kHz. The period of its rotation3 fmasl28t, ave1r.nn is

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A phonograph record rotates at 45 rpm. 8:n xxe je9kh )k+ek.yThrough what angle does it turn in 0.20 s?jkxe8ke9 xn + ).y:keh

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel of diameter 26 cm turns at 1500 rpm. How far will a point on tadmri3mfa3 4 8j/ ola6;dd.y mhe outer rim move in 2.1 /3aimdor;.j6ma 3d ma f84ldys?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 +i uo4o k( cjitao+4o+s. What is the average jiota(oo +ou4+k4 ic+ angular speed of the wheel?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 s. What is t5ox6tw+rkl;ar kn 6 :( :wzkovhe linear speev onzk6wklt w or:x6+k5: a;r(d of a point 0.10 m from the center of the wheel?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cable car at a ski resort carries skiers a distance of )01c mj6lqrfqmr 6r 7gds/(etu5 nrn5jq- c6h6.8 km. The cable which moves the car is tlrq1e5uq(jsrq6m 6hr g6m)f 5nc rc-d 07jn/ driven by a pulley with diameter 3.0 m. Assuming no slippage, how fast must the pulley rotate for the cable car to make the trip in 12 minutes?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel of radius 1.0 m is rotating hyuuhretb e6 oft.v8:0ay5 i,9f-wq1with a constant angular speed of 2.0 rad/s. What is th9y 8tv.e1r0 f:u bquotiay5-, f wh6hee linear speed of a point on the wheel's rim?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cutting cord on a gas-powered weed cutter is 0.16 5kyc*orwd3ju+.fg g /m in length. If the motor rotates at the rate of 20 rev/s, what is the approximate linear spe*f jow +u gyc/drk.5g3ed of the end of the cord?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel of radius 1.0 m is rotating with a constant angular speed of 2.0 rad/smm,9c lj6,h 67)si-f l7pe e*olaekjn2 .tihq. What is the centripetal acceleration of aqne,t67lekp)mij,e9 l 2lhah 7 -6com.*isjf point on the wheel's rim?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the centripetal acceleration of a point on the perimeter of a bnvk n k1rf : d+wxp9xo81;t7gticycle wheel of diameter 70.0 cm when the bi1v 1wf8 tpn9dkxkn7:o;tr +gx ke is moving 8.00 m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many revolutions per minute ( b:wzn 2pwusoc80 i ;2r,zbwj5rpm) must a circular, rotating space station (r = 1000 m) rotate to produce an artificial gravity of:wiu,sncz2o 02b5 ;rjzwb8w p $9.80 \; m/s^2$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car is negotiating a flat circuwv, zi45 lli4;nh2o nflar curve of radius 50 m with a speed of 20 m/s. The maximum centripetal force (provided by static v; 5wn24n4zoif,ilh lfriction) is $1.2 \times 10^{4} \; N$. What is the centripetal acceleration of the car?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car is negotiating a flat c7z 1o ttke5(q9hv7,ap te/id pircular curve of radius 50 m with a speed of 20 m/s. The maximum centritiet/9oq7tkp 7dv,1 pah5 ze(petal force (provided by static friction) is $1.2 \times 10^{4} \; N$. What is the mass of the car?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.300-kg mass, attached to the end of a0+u )(grf ejla z 9vvkeu*2n5r 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 l05ze)2e lr* 9fnk(vj au vrgu+inear speed can the mass have if the string is not to break?

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50#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bowling ball of mass 7.5 ba1-fap-o5 1o dhu zu8n/ (lnyegbj,6 kg and radius 9.0 cm rolls without slipping 10 m down a l a n-oyb l-f18od eujngh/6up1 5a(b,zane at 4.3 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)

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel accelerates with a cony 2q1sp6tssr .stant angular acceleration 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?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel accelerates with a constant angular accelerati2rey )yg1us j4on 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?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many radians does a 0.300-bd:2q21w, kpgm ow41o (qbs yjm radius automobile tire rotate after starting from rest and acce,2d 4mobwkoq(:21 yw jp1s bqglerating at a constant angular acceleration of $2.00 \; rad/s^2$ over a 5.00-s interval?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel starts at rest, and has an angul 4m4mbv 7r4mylp .qu4car acceleration of $4 \; rad/s^2$. Through what angle does it turn in 3.0 s?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A Ferris wheel rotating at 20 rad/s decelerates with a constag)g134p/tm artpdo7 jntv4 4pnt angular acceleravn4t17 ggm3pdp a4/jtt) opr 4tion of $-5.0 \; rad/s^2$. How many revolutions does it rotate before coming to rest?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel starts from rest and reaches an angular speed of 6.0 rad/s while turninfhr1, xe+3cho g through 2.0 revolutions. What is the averagehof13x r+ hc,e angular acceleration of the wheel?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel of diameter of 68.0 cm slows down unif8xek( woffag/)7zj cr- l;s:uormly from 8.40 m/s to rest over a distance of 115 m. What is the total number of revolutions the wheel rotates in comuw j7g(fa) c-x olzs/r;8: ekfing to rest?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel of diameter of 68.0 cm slows down uniformly from0y;3 pk;sd8m +cgkxuj 8.40 m/s to rest over a distance of 115 m.j+ kgm yk8;0;dpus3 xc What is the angular acceleration?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel of diameter ofu7b1ko atuzej2yf3. 8 68.0 cm slows down uniformly from 8.40 m/s to rest over a distance of 115 m. How long does it t8 172t. uofbukjy3z aeake for the wheel to come to the stop?

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60#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A centrifuge in a medical laboratory rotates atqo+1 d 7hw4dlpvkkh 0hb 7w0(z a rotational speed of 3600 rev/min. When switched off, it rotates 50.0 times at a constant angular acceleration bh(40o wpdd+0wh1bzkkl 77vqh efore 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.    $s$

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The bolts on a car wheel requirwqks*nkg(*vp2 jq5u9 e tightening to a torque of 90 Nm. If a 30 cm long wrench is used, what is the magnitude of the force required when the fjq*g5npuwv* 92q (k ksorce is perpendicular to the wrench?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The bolts on a car wheel require tightening to a torque of 90 ghe:a8e sqr3t u:k6rn cs),8w Nm. If a 30 cm long rkt :q6nshg)3e8: e a,ruw 8scwrench is used, what is the magnitude of the force required when the force applied at $53^{\circ}$ to the wrench?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel with moment oi xxtr.h o5l7))wtnt- f inertia $3.00 \; kgm^{2}$ has a net torque of 3.50 Nm applied to it. What angular acceleration does it experience?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A triatomic moleculeth+b3+,nbxqa km)sg 7 is modeled as follows: mass m is at the origin, mass 2m is at x = a, and, mass 3m is at x = 2a. What is the moment of inertia about th+ats7hqb) n3 ,xm+b gke origin?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solid cylinder of mass 10 kg is pivoted / kadfj*ce2. uy)- xtlabout a frictionless axis thought the center O. A rope wrapped around the outer radius R1 = 1.0 m, exertl.-*j eyt d /a)c2xfkus 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. 8-1.) What is the angular acceleration of the cylinder?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solid cylinder of mass 10 kg is pivoteo9zl6,. ya4zu i y4lf xyoda36.nmon+d about a frictionless 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 wrapo6,yi 3.9al4 .moz xan4znuy +y o6ldfped around another section of radius R2 = 0.50 m exerts a force F2 = 6.0 N downward. How many radians does the cylinder rotate through in the first 5.0 seconds, if it starts from rest?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-m long rod is hinged at one end. The rod is initially held in the horizo2garht 6 yme-,ntal position, and then released 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 arg-h2 t6,emy ML2/3.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a bicycle wheel to be a ring of radius 30 cm and mx1epuqla7 6lc q )*xt/ass 1.5 kg. Neglect the mass of the axle and sprocket. If a force of 20 N is applied tangentially to a sproclqc*a 1qe/p) lx6x 7tuket of radius 4.0 cm for 4.1 s, what linear speed does the wheel achieve, assuming it rolls without slipping?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.53-kg mass hangs on a rope wrappemmomg7ypqq/bv24is -.b f( k ;d around a frictionless disk pulley of mass 7.07 kg and radius 66.0q(msp ;fb7b/2 . gmko-y4imqv cm. What is the angular acceleration of the pulley?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.53-kg mass hangs on a rope wrapped around a frictv-63qrp trribye 9ta 5 5(8tfuionless disk pulley of mass 7.07 kg and radius 66.0 cm. What is the acceleration of the met5pv 93qyrir6ab 8(r5fu-tt ass?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rotating flywheel can be used 1mt2.ycxyb . c48numsa3 nz)+wq zyp( to store energy. If it is required 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 $kgm^{2}$?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wheel of moment of inertia jdf d4 ra mq/e+76lgdxkm46t-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?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solid sphere of mass 1.0 kg and radius 0.010 m starts from ret gd e(r4-79yl k31mx4wuvtq9( uibvfst and rolls without slipping down a 1.0-m high i9rk(tl v-w vx g4 tu9yi(ef43md7q b1unclined plane. What is the speed of the sphere when it reaches the bottom of the inclined plane?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solid sphere of mass 1.00cbn t/p2a )/m9eohpa kg and radius 0.010 m rolls with a speed of 10 m/s. How high up an inclined plane can it climb before c b/a0nc)aphp2moe/9 toming to rest?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A hoop of radius 0.50 m and a mass of 0.20 kg is)t5bg 77jpkt f released from rest and allowed to roll down an inclinet f77g)t bkp5jd plane. How fast is it moving after dropping a vertical distance of 3.0 m?

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76#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A solid sphere of mass 1.5 kg and radius 15 cm rolls without slippinq hws+j)p8ulp3yo)z 3g down a 35e incline that is 7.0 m long. Assume it started from rest. The momentp3hl))z u+q p3o8wsjy 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?
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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object's angular momen;raatg e35l6s w v23awtum changes by $20 \; kgm^{2}/s$ in 4.0 s. What magnitude average torque acted on this object?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 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?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ice skater has a moment of x8m.oi mv t2an:e (ob)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?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A figure skater rotating at 5.00 rad/s with arms extended has a moment .)z j9: ldc7mu*ar8zjf yiz 7xof inertia of ymjzdira f.x j9l*c8zzu)7:7
$2.25 \; kgm^{2}$. If the arms are pulled in so the moment of inertia decreases to $1.80 \; kgm^{2}$, what is the final angular speed?

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