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习题练习:Circular Motion



 作者: admin发布日期: 2024-08-14 21:51   总分: 32分  得分: _____________

答题人: 匿名未登录  开始时间: 24年08月07日 16:01  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  
  95.02: An object shown in the accompanying figure moves xdsxr .76 ym-iz o.3z5xnc5dr:ulc x:in uniform circular motion. Which arrow best depiz .cd 3 sx:x rzyu5:-xx.crd 5oiml7n6cts the net force acting on the object at the instant shown?


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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.31: A child is belted into a Ferris Wheel seat that rot:x :;g+ vbw) 2ihivsdcyyfv*3ates counterclockwise at constant speed at an amusement park. At the location shown,:vw2b+g;d iy i3vc f)sy:*vxh which direction best represents the total force exerted on the child by the seat and belt?


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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.14: A particle con298srvq9,x msl-2r kfchs n)stinuously moves in a circular path at constant speed in a counter- clockwise direction. Consider a time interval during which the particle moves along this circular path fr k,8 )smss2lhs2fxnrq99 rc-vom point P to point Q. Point Q is exactly half-way around the circle from Point P.
What is the direction of the average velocity during this time interval?


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4#
 
多选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.15: A particle continuously moves in a circular path at nn3kwc*i3tsw42 x.pvb7 oo6 t constant speed in a counter- clockwise direction. Consider a time interval during which the particle moves along this circular path from point P to point Q. Point Q is exactly half-way around the cib76c o3*kviox.3w 2nstw tn4prcle from Point P.
What is the direction of the average acceleration during this time interval?


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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.07: An object movugh 3c; q8v5gces clockwise with constant speed around the vertical circle shown. Which arrow best indicates the directi3ug ;g8q5vc hcon of the object’s instantaneous
acceleration at the point labeled X?


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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.11: A girl twirls a small mass connected to the end of a string counterclockwa2hsj: 0 af,1ipnm ug0: o(vpwise in a horizontal circle above her head. The figure shows an outline of the mass’s path viewed from above the twirling mass. If the girl needs the mass to pass through the point labeled P in the figure, at which lettered point on the path shofphj gvpa0s nm(o: a02w1i: ,uuld she let go of the string?


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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.23: A car moves with constant speed around a* k9yt,zo) *ur gs/ffetumq+0 horseshoe-shaped path as shown with the arrows in the figure. Which one of the following choices best describes th *uo,g +m9*/ksufqz f)y0re tte direction of the average acceleration of the car in traveling from Wto X?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.35: Astronauts on the Moon perf( zlye /t-ns;zbfmb32 orm an experiment with a simple pendulum that is released from the horizontal position at rest. At the moment y(3-fsb ezb ;ltz2/nmshown in the diagram with $0^{\circ} < \theta < 90^{\circ}$ , the total acceleration of the mass may be directed in which of the following ways?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.19: A heavy (2.0 kg) poibsw5cu.:q di5 2d kk0znt-like object rests 2.0m from the center of a rough turntable as the turntable rotates. The period of the turntable's rotation is 5.0 seconds. The coefficient of kinetic friction between the object and turntable is 0.50, while the coefficient of static fric520dbk:wk 5iu qdczs. tion is 0.80. What is the magnitude of the force of friction acting on the object?

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.19: What net force is necessary to keep a 1. 0 kcmi vexq xbt+-4lw.3.g puck moving in a circle of radius 0.5 m on a horiztvmw+i4qc l -xe.. b3xontal frictionless surface with a speed of 2.0 m/s?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.03: What is the centripetal acceleratio/+a27o 3 f wcpl2fghi4es1 xuyn of an object (mass = 50 g) on the end of an 80-cm strinf7 e /x2p wucli ago4s2+13yfhg rotating at a constant rate of 4 times a second?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.24: A point mass moves alongy4 ed9my/ps ;t a horizontal circular path of radius 0.8m with a constant kinetic energy of 128J. What is the magnitude of the net force acte/ps y ytm4;d9ing on the mass as it moves?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  96.24: A 2.0-kg ball is attachedwj3th)s (i +s,pp3v thz2k im0 to a 0.80 m string and whirled in a horizontal circle at a constant speed of 6.0 m/s. See figure to t p +miwh(st,k)30i szt phvj32he right. The work done on the ball during each revolution is:


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.22: A child whirls a ball at the end of a rope, n5b1z3))zsnmg sm: p tin a uniform circular motion. Which of the following statements is NOT truz n5zn)ms g1mt)bp:s3 e?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.19: An astronaut in an orbitba,kcd krb7 65wa;w:b ing space craft attaches a mass m to a string and whirls it around in uniform circular motion. The radius of the circle is r, the speed of the mass is v, and the tension in the string is F. If the mass, radius, and speed were all to double the tension required to maintain un;,r7k:bdbc 6kaw5 bawiform circular motion would be

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.22: A mass m is pulled outward until the string of length Lbiw2pt-4wph7 to which it is attached makes a 90- degree angle with the vertical. The mass is released from rest and swings through a circular arc. What is the tension in bp74p2-i wwh tthe string when the mass swings through the bottom ofthe arc?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  94.15: A car is traveling on a road in hillyuwky3dt 7)x5sm+b qk/cua z0, terrain, see figure to the right. Assume the car has speed v and the tops and bottoms of the hills have radius of curvature R. The driver of the car is most likely to feeb)5w uxakqc0k/7,md3st+zu y l weightless:


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.10: A 2000 kg car moves over a hill at a constant speed of 12.0 m/s. Axx (i4v1iavdh. ip 7y z0tt3c1t the very top of the hill, the shape of the road can be approximated as a ci itv0.pv ytix1d7ch3z 14(aixrcle with radius 25 m, as indicated in the figure. Which one of the following choices best represents the magnitude of the upward force exerted by the road on the car?


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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.13: A small sphere is moving in,w1otvkj3lk l j* n+9fsgh ja l)4u3/m/ cc*vm a vertical circle at constant speed. The magnitude of the net force on /* wcl flg1oc lkm9n)k 3vh a, u*tjj4v+s/mj3the sphere

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.47: A simple pendulum of length Lhasa point mass M released 43exrv;b 3aks huw*(cwze6 9r from rest from the horizontal position shown. In the absence of air resistance and friction, the mass swings through the arc of a circle. Let T represent the magnitude of the force from the string on the mass (tension), G represent the magnitude of the gravitational force acting on the mass by the earth, and F represent the maacse6z3r(hr 9kbuwx4wv*e3; gnitude of the net force acting on the mass. Which one of the following choices describes the relationship among these forces when the mass swings at the bottom of the arc (point P)?


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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.32: A mass connected to a(msi-: u summr.v6oa )fj(uz0 string forms a simple pendulum. The mass is released from rest and undergoes simple harmonic motion. Which one of the following choices correctly ranks the magnit f0j srivs6a-)o. umm(muz: (uude of the tension in the string (T), the gravitational force on the mass (W), and the net force acting on the mass (F) when the mass swings through its lowest point?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.41: A centripetal force of 5.0 newtons is applied to a rubber s.vdm 2 a.cf v-oq4akd0topper moving at a constant speed in a horizontal circle. If the same force is applied, but the radius is made smallermcv k.q f2d4aa.ov- 0d, what happens to the speed v, and the frequency f, of the stopper?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.28: A mass, M, is at rest on a *4lq7t, ubx wx;e ro )ra:lg:dfrictionless surface, connected to an ideal horizontal spring that is upstretched. A person extends the spring 30 cm from equilibrium and holds it at this location by applying a 10 N force. The spring is brought back to equilibrium and the 47er*uqtrb, x)wo:;:alxdglmass connected to it is now doubled to 2M. If the spring is extended back 30 cm from equilibrium, what is the necessary force applied by the person to hold the mass stationary there?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.22: A girl swings a 4.0 kg mass with a consta vg*.2w/iycd jg7qv0ant speed of 3.24 m/s in a vertically-oriented circle of radius 0.75 m. What is the net for72 dy0g j gc*.i/avvqwce acting on the mass when it is at the lowest point of the circle?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.23:Two small identical cn-1)( 8 /casbxeqsuev oins (labeled X andY) are at reston a horizontal disk rotating at a constant rate about an axis perpendicular to the plane of the disk and throv-q nsc8e b(/ xs)e1auugh its center. The distance of the coins from the center of disk is related by $d_x=\frac{1}{2}d_x$. Which one of the following choices correctly identifies the relationship between $f_x$and $f_y$ , the frictional force on coin X and on coin Y, respectively?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.40: A 2.0 kg mass is connected to the t 1mh 31pez*,3gmadlo end of string and moves about the string’s fixed end in a conical m13h3dz,gp1et l* aom motion with a constant speed of 4.0 m/s. The string has a length of 2.50 m and forms an angle of $θ$ with the vertical. What is the tension in the string?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.26: A 4.00 kg mass is in uniform circular motiogte:m mqn7c3vh)f7g sh7 -f/ sn as shown in the figure. The string to which the mass is attached has a length of L = 3.00 m and forms hec q)vh ngm3/:77 mft fssg7-an angle of $θ=50^{\circ}$with the vertical. What is the speed of the mass?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.23: A small object of mass 11.0g is at rest 30.0 cm from a horizontc-a1)4ki v qbo uepu08al disk’s center. The disk starts to rotate from rest about its center with a constant angular 4-b8)au1q co i0vpkeuacceleration of $4.50 rad/s^{2}$ . What is the magnitude of the net force acting on the object after a time of t=1/3 s if the object remains at rest with respect to the disk?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.35 A point object with mass M = 2.0 kg is attached a distance R =1.75 m from ryi3u4ra1 ls o4+dhv16q24 lb wt1ktithe fixed center of a disk as shown in the figure. The disk starts rotating from rest with a1qdrbku3il2lw r6st+y 44 vto 1i41 hconstant angular acceleration $α =5.00 rad/s^{2}$ about an axis perpendicular to the plane of the page through the disk’s center. After how much time (in seconds) is the tangential component of the point object’s acceleration equal in magnitude to the centripetal component of the point object’s acceleration?


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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.39: An object moves in a circle, starting at the top, wixe cxq5 hbv,y6:g1 h7uth initial speed 17.0 m/s. The object’s speed increases uniformly until it has5yv xxeb,q7:6c1 hugh moved counterclockwise through an angle of$55^{\circ}$. The average acceleration for this motion is $9.8 m/s^{2}$directed straight downward.
What is the final speed of the object?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.40: An object moves in a circle, star +sc7 uv* *wqwpum3h 5v*d5zmiting at the top, with initial speed 17.0 m/s. The object’s speed increases uniq uvzsmc 3di* *+w5vmp5 h7*wuformly until it has moved counterclockwise through an angle of$55^{\circ}$. The average acceleration for this motion is $9.8 m/s^{2}$directed straight downward.
What is the time for this motion?


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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.38: A small 2.0 kg block rests at the bottom 7 xrsp)h9zio v8- .ofdof a bucket. The bucket is spun in a vertical circle of radius L by a rope. When the bucket reaches the highest point in its motion, it moves just fast o7 hzov-x pi.rdfs8)9 enough for the block to remain in place in the bucket. When the bucket is at an angle $θ=30^{\circ}$from the vertical, as seen in the figure, what is the magnitude of the normal force (perpendicular to the surface) provided by the bucket onto the block? Note that the direction of the gravitational field is indicated in the diagram byand that the block does not touch any sides of the bucket aside from the bottom of it.


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