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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 usually expressw6qm v:mxm y/yjor+0* 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 unio7)trm)umqpse 2)e fwk i /u4(ts 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 isd3w/ ) kr05l8ggq tqun units 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 ridi (0 nstfh r7.bkb4dr7cng on a merry-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 angular displ n7(07rfk ht4sdb rb.cacement?

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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 r9xdco;c3 -taxc( 0we qiding on a merry-go-round which is turning at a constant rate. The boy is near the outer edge, and the girl is clc e; q3x-do(0cct w9axoser to 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 riding on a m44anv:savc22. yxenmerry-go-round which is turning at a constant rym ea2c4xs :n.v4a2n vate. The boy is near the 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/5ijanb(; o0e,7x/w d8 yqc ncf7w myz merry-go-round which is turning at a constant rate. The boy is near the outer edge, while the girl is closer to the center. Who has tb d0;eyi7o(x /,f 7/qjw c8nm 5nwyczahe 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-go-round w8glp .9 3ae-e ak9pevihich is turning at a constant rate. The boy is near the outer edge, while the girl is closer v3g-paie ee99p.l a8k to the center. Who 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 of the following ishv -ny p8 l 5mw9.x3jsu4ll9me an accurate statement?s3wl84u9v5 hmnmlj 9y-.l xp e

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Rolling without slipping depe;ow6))x1w7)t+imh g emm0o 5zggyg kwnds 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 door. gi.r3vj. ay2i+rqc3i The first force is applied at the midpoint of the door; the second cr3.i ar.q2vy+3 ii gjforce 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 to a door at the doorknob. The f:kks z7kfx01t x:d7a3fqrym(; q e)d xirst force is applied perpendicular to the door; the second force is applied at 30e to the plane of r;ek(qk :: dkz 7 tx0f1xa)xyq73dsmf 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. The first forc1p4 wy;l gc;/t4rxvqfmz5 )rk)wm8ile is twice as large as the4ltx) c;iw1m5gf/yw8 r);4pr lmvk zq second force. The ratio of the torque of the 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 5ctpq er+1w /*wxpc*pused to measure an object's resistance to changes in rotation5e*pqw1t+w p p/c xrc*?

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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 hav 3im /rn.lec /dr8oi66( nf0 rdii:syuu9+ kzze the same diameter, but one has twice the mass of the other. The ratio of the larger mu:ri6nkzfs(8 +0 /9nm uzcly6i.i/i edod3 rroment 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 same mass, butmz2cw,r-jq -yz + iw7vi+2hvc one has twice the radius of the other. The ratio of th72z ywvi,-mzv+qw -+jrcch 2 ie larger 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 thikvnq( :; s ypw2e,/vnf*n*nce mass and twice the diameter of the other. The ratio of the larger moment of inertia to that of the smaller moment of inerti,; nvfepk:/w ** iqyvns(ncn2 a 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 ra,n sl- :.zkf.s, yzoeedius R. If these are increased to 2M and 3R, what happens to theeo.znsz:f.-kly, s, e sphere's moment 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 or b.(x7wkniy3apf,8 fbject, 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 sol0d(av p , e(plu,cp6qpid cylinder about its axis is given by $\frac{1}{2} MR^2$. If this cylinder rolls without slipping, the ratio of its rotational kinetic energy to its translational kinetic energy is

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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 xrgwzsts k8(u ke,h2z/0d1pj,;b gl. of which has a mass of 10 kg and a radius of 30 cm. What is the ratio of the rotational be2 d,;sz klr,kp(80ug1szx.gwj/ht kinetic 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 M and radius R rolls without sf x xc1uz:9f:llipping down an inclined plane starting from rest. The linear velocity of c9 ulzxf:xf :1the sphere at the bottom of the incline depends 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 ;mv nfu8/i .zxR rolls without slipping down an inclined plane starting from resuiv m f;8nz./xt. The angular 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 system of particles changes when avtq*lm.w. *) vyeqg q. net external force acts on the systemqqyg.*m.q v*v.et )lw ." This statement 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 caom.3q/qp p jx w(r-f9en the angular velocity of system of particles change withfo9qpj ( -rwx p./3qmeout any change in the 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 orbit. Ignore anae l:s y 89ta;ap2krd*y friction which may be present. What happens over time to 2pk a :t*dy;srl98aaethe Earth's angular momentum 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 Earth moves close4a vb8.w)k)l el ctd xd3:+xsu shms.4 to the Sun, then which of the following best describes the orbiting speed of the Earth about the Sd wesalslt:.k) 4 3vbdhscm8 +4) xx.uun?

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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 pulling in qj)7)4z ;p* 3dir(parz gbucjy6r;ls his outstretched arms close to his body6rc ;prlpq(a)u7g;srdj z)*z43ybi j. What happens to his angular momentum 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 (o7vs t 1f2b(jga fast spin) by pulling in his outstretched arms close to his body. What happens to 21jfv sbg o7t(his rotational 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) by pulling in his outstre2gim9qs0 k/d jk2/ocftched arms close to his body. What happens to his mo0//o229qcdsg jk fki mment 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 conservation of angular momentuq+yn pyud-,sg ih,i o9.fmn;9m.
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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 nearly cifl aug7uw ,6n: 1;liujrcular orbit abu gn;llj 6au1w7f:ui,out the Sun with 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 clock has a length of 0.30 m5 9j:wta.g 0miu xw,pq. What distance does the tip of the second hand sweepi x5a9t qjp,:u0 m.wgw through in 3 minutes and 45 seconds?

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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 revolution3m9zbbyk3nd: s per minute equivalent to?

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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 uniformly through 2.0 revolutions in 4.0 s. What ig,juuyt b*8:ts the b*8guytt ,:uj frequency 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 rotating4lq6e t.v,itrhv-p 4c neutron star) emits pulses at a frequency of 0.40 kHz. The period of its rotati-h le trv4cipt. ,vq46on 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 rotates3tbiqvj s9: y9 at 45 rpm. Through what angle does it turn in 0.20 jvq9 :3 ystbi9s?

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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 wie4,nzlh csvtcr/0 g5vx*k*e +ll a point on the outer rim movecel/ *0n, v 4skxzt+r5g* cveh in 2.1 s?

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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 s. 6zw6 4sp nvlp*jc,r7+yg i faza*ig46What is the average angular speed of the w+w z ci6pa lzsn ,gfjp**4674 giy6varheel?

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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:l. ; *jz-n ap8:eod7x/ilv(fdugj iw uniformly through 2.0 revolutions in 4.0 s. What is the linear speed of a point 0.10 m f:a( ;-x 8ienpz i/d fjj.lg7:wudl*vorom 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 carrn;jr r h1f/i5hsk: o(gies skiers a distance of 6.8 km. The cable which moves the car is driven by a pullkogr;h 1 rs(fh/j 5n:iey 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 p/ 4miuu3zie:is rotating with a constant angular speed of 2.0 rad/s. What is the linear speed of a point on miz /ue3 i:4upthe 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-pftfj6 k6 (i dibjld/jt gn/49:owered weed cutter is 0.16 m in length. If the motor rotates at the rate of 20 rev/s, what is the approximate linear speed of the end o btk/i94 /jjt (ndflg6jdfi6 :f 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 rotatkfhel oqcj 4j8+ vz4-3ing with a constant angular speed of 2.0 rad/s. What is the centripetaf j83cv4zqo+4 kle-jhl acceleration of a 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 bicycle ,j)nhhh 1qx fm*aln pqzq3)/,wheel of diameter 70.0 cm when the bike is moving 8.00 m/s?/f,phh3j )nqz*a)1q hlx,nqm

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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 (rpm) must a circular, rotating spq cpd -+id*d8eace station (r = 1000 m) rotate to produce an artificial gravity + iddp *q-e8dcof $9.80 \; m/s^2$?

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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 30c4 4qkdjvs,v7eb eucircular curve of radius 50 m with a speed of 20 m/s. The ma0,47 bk3jv 4esvu edcqximum centripetal force (provided by static friction) 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 circular curve of radius 50 m with a speed of 20 m dt856ni wfgt n))8h8 ptawfg5/s. The maximum centripetal ng 6 5ftgwthp8 an5f))id8 8twforce (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, attac(.dm, r*szwem n+s2xl4y5fslhed to the end of a 0.750-m string, is whirled around in a smooth level table. If the maximum tension that the string can withstand iels+*fs(5,ym24 d rlsm wx.zns 250 N, then what maximum linear 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 kg and radius 9.05 h kmqr7rzj2:r(pmw u+qu 6h(q*s+ch3ju9gh cm rolls without slipping 10 m down a phu(kq9uuj h zrs2(6 hc5+ mg3 w*m+rrhqj:7qlane 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 constant angular acceleration ofw*s++y pjq:jx;lxwp8 $4.5 rad/s^2$. 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 accexfvj ,rs v+gj 9m1/hi*leration 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 0.30 t*7kyf22 g+8m7 lb jvjt.sm7y.zz6 oiidoxr( 0-m radius automobile tire rotate after starting from rest andilz sj27x82.oi67vy y rzj tdo*g+(7m.mbtk f accelerating 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 ad, 8mejqtu 3v zx ewq+8*jb;b*c m5.ltngular 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/ - sbzf8ecxia-gos g:wfiyu p08 +:bs:u17h .is decelerates with a constant angular acceleration ofy .z+u0wxfgi ss:gs-boih:u:p a1iefbc 8 78- $-5.0 \; rad/s^2$. 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 whiyynqq/jpont /3f-q4z r,w2 1qle turning through 2.0 revolutions. Whn p/q/q-nfy 1zoqywj tr, q324at is the average 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 uniformly from 8.40 m/s to r8 yi 2q)jafx1rest over a distance of 115 m. What is the total number of revolutions the wheel rotates in coming to rest) r218qxaiy jf?

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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 from 8.40 m/s to reg0uxikjn:8c r vna1k4v9f::cat x+ b (st over a distance of 115 m. What is the angular accelerationt(cc:v 9:gx+xi4k0nru nba8k : f 1ajv?

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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 of 68.0 cm slows down u-,zut(qw(6 wh)ozsgtw tc z4d0an(c+ niformly from 8.40 m/s to rest over a disozz(c,( qtsnctu+gwdt -4( h waw 0z6)tance of 115 m. How long does it take 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 labo pw.p,wd( xav9ratory rotates at a rotational speed of 3600 rev/min. When switched off, it rotates 50.0 timeda.ww p,v9(px s 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.    $s$

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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 require ti9 kj pf4q6q6dnghtening to a torque of 90 Nm. If a 30 cm long wrench is used, what is the magnitude of the force required when the force is9j6qp f4n6 kdq 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 Nm. If a 30 cm loz/y x,i )sjyy3ng wrench is used, what is th,isyz3 /jx y)ye 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 of inertig o 0wm+ /rzdvh3mp sqfi2c789a $3.00 \; kgm^{2}$ 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 molecule is modeled as follows: mass m is at the origin, mass 2m iem;6 p1pdnm 1bs at x = a, and, mass 3m is at x = 2a. What is the moment of inertia about the originpdebp1;m6 mn 1?

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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 piv. q:slti4 5xhq:p+ 5.zccpkvdoted about a frictionless axis thought the cenc5 hx.vpz.dlpc tqq k::i 4+s5ter O. A rope wrapped around the outer radius $R_1$ = 1.0 m, exerts a force $F_1$ = 5.0 N to the right. A second rope wrapped around another section of radius $R_2$ = 0.50 m exerts a force $F_2$ = 6.0 N downward. (figure below) 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 pivoted about a frictionless axis thought th: +, :gxxwutmme center O. A rmgtx::+mxu, wope wrapped around the outer radius $R_1$ = 1.0 m, exerts a force $F_1$ = 5.0 N to the right. A second rope wrapped around another section of radius $R_2$ = 0.50 m exerts a force $F_2$ = 6.0 N downward. (figure below) 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/ t -mxzbbb4f* is initially held in the horizontal pos bfmx b4b-zt*/ition, 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 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 ixnez1)m; he yk81quqt r;a .*be a ring of radius 30 cm and mass 1.5 kg. Neglect the mass of the axle and sprocket. If a force of 20 N is rx ea;uzeqk1i.q m1 )n8t* y;happlied tangentially to a sprocket 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 wrapped around a frictionless d+ukx1 opw+d ( dpv4 ;wgdcao59isk pulley of mass 7.07 kg and radius 66.0 cm. What is the angular acceleration of the pdppagv+xuw9codk; (do4 w5+ 1ulley?

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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 friction+xlar htxw, (* xca)j6less disk pulley of mass 7.07 kg and radius 66.0 cm. What iaw)r6 a +htxj(x*xl ,cs the acceleration of the mass?

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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 8zg :pni9py)sbe used 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 inerti-f dvn why6 1bm9g.r*ba 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 radiu / qr zipykg-g7)het5/s 0.010 m starts from rest and rolls without slipping down a 1.0-m high inclined plane. What is the speed of the sphere when it reaches khtzqr)yig/ge /- p5 7the 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 1.0 kg and radius 0.010 m rolls witzka n ;c7ye 9+8txo(teh a speed of 10 m/s. How high up an inclined plane tto; zankcy(8e97ex+can it climb before coming 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+asc zg t01e-ef/x (0m gdh4ho of 0.20 kg is released from rest and allowed to gx hesh1o/0 -dce4ft z(+mg 0aroll down an inclined 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 slippi9uerrv1 3q 0t(x4ar heng down a 35e incline that is 7.0 m long. Assume it started xe4v3ra ur91rteh( 0q from rest. The moment 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 momentum changm( wd+nv*exs1es 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 momenj6ttv+ l80f j.panr y8 t9ff0yt 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?

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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 ext r6;yk f ai8yck-zfmpxq,; nq)d ;6l+eended has a moment of inertia z8p)dq;ir; klk,6n-ayq;6 fxyf+m c eof
$2.25 \; kgm^{2}$. 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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