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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 accom-/4qrxqk z5(kl +cycw panying figure moves in uniform circular motion. Which arrow best depicts the ne xql rc(qy/c wk-4+kz5t 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 se2gyf(tsmpzz jw/0yhr; y 2.o ;at that rotates counterclockwise at constant speed at an amusement park. At the location shown, which direction best represents the total force exertez/ ; .ypgyt2rh sy;j zfm02(owd 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 continuously moves in a circular path at conpb60,4f(o e vg9gjv y,7qezg istant speed in a counter- clockwise direction. Consider a time interg 6gj4qzvb709iege,v o( p y,fval during which the particle moves along this circular path from 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 ate z 1p x(j,dlo6zd-w:l constant speed in a counter- clockwise direction. Consider a time interval during which thex6(wz del-j1 pl zdo,: particle moves along this circular path from point P to point Q. Point Q is exactly half-way around the circle 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 moves clockwise with constant speed ar.6qfqu j8 iyx9ound the vertical circle shown. Which arrow best indicates the direction ofjqy6.if9q xu 8 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 skc.,jc6 g6(fanzvwl7 tring counterclockwise in a horizontal circle above her head. The figure shows an outline of the mass’s path viewed from above the twirling mass. Izf a6 v7ng,c(w. 6ckljf the girl needs the mass to pass through the point labeled P in the figure, at which lettered point on the path should 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 horseshoe-shape . sof tam6c2h5xrikw+n(jp98d path as shown with the arrows in the figure. Which one of the following choices best describes the direction of the average acceleration of the car in traveling from Wto sc5t hijp6xfor a.(w8 nmk+92 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 perform an experimente7x:l: s ntc12vsh rz0 with a simple pendulum that is released from the horizontal positio1 70ss:ez2tvrc hln:xn at rest. At the moment shown 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) point-like object rests 2.0m from mv6kj0 3n6c fcthe center of a rough turntable as the turntable rotates. The period of the turntable's rotation is 5.0 seconds. The coefficient of k cf6n603 vjmkcinetic friction between the object and turntable is 0.50, while the coefficient of static friction 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 kg puck movoe ;,t40u y zqwh2pdc. ld0ef:ing in a circle of radius 0.5 m on a horizontal frictionless suy w h20p:0qct.ddlu e;o,z4efrface 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 acceleration sr b2yteng)8u)9qvx+ of an object (mass = 50 g) on the end)vs bg 29eyrtn+)8xuq of an 80-cm string 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 m 74b7*mc 4 dqjeaqh.hdoves along a horizontal circular path of radius 0.8m with a constant kinetic energy of 128J. eqd4j. h b* c477dqhmaWhat is the magnitude of the net force acting 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 a3e 4 - pzef:qev-tau *7x 9iddxzz 4)kug;b(twttached to a 0.80 m string and whirled in a horizontal circle at a constant speed of 6.0 m/s. See figure to the right. T )x wztdk3a;u*qde:bf-7e9pueg4z (i -x vz4the 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 qr; r+1b2nw* d7m1fut :yyc jfa rope, in a uniform circular motion. Which of the +*ubrm72yrfq :cw1n1yf jtd ;following statements is NOT true?

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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 orbiting space c c)avw*:n+ grfraft 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 uniform circua:rfwn+v*g)c lar 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 L to which it4d,oe3uxd5ok* b5m wi7:aqc gmifx 4( is attached makes a 90- degree angle with the vertical. The mass :dx wq45gf3,me 7a5kbo4i*i(u dx mocis released from rest and swings through a circular arc. What is the tension in the 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 roadmg1i -wvt rr,zp(0pj* in hilly terrain, see figure to the right. Asstr gj (rp-w1izm,vp0*ume 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 feel 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 0ti -o:ft7jrx12.0 m/s. At the very top of the hill, the shape of the road can be approximated as a circle with radius 25 m, rtot if:-x j70as 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 a vertical circle at constant speed. Thv p2if wrp:/(lf wlw+:e magnitude of the net force on lpf(fw/r:wp+viw2: l the 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 from rest q6nbbo5909zasohajbae *3m. 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 massbs3b9 om 6azeoah9q0jab5*. n by the earth, and F represent the magnitude 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 f91fzz2wrx w/to a 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 magnitude 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 mawf/1 92zfxrwz ss 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 forcfvd97ux tja gv ::j92ne of 5.0 newtons is applied to a rubber stopper moving at a constant speed in a horizontal circle. I2:9 tx7u d:vgjj9fanv f the same force is applied, but the radius is made smaller, 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 frictionless surface, connec a7r o 3p8jwl-sz0jcvmr032s eted 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 mass 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 there3cj7ss lr8rz2wm0ae0o 3v-pj ?

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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. w*n;/:tgpa39awhyji-i c4c v:q. lfh0 kg mass with a constant speed of 3.24 m/s in a vertically-oriented circle of radius 0.75 m. What is the net force acting on the a qcchh tafig4n-y :li*vp93. /j:w; wmass 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 coins (labeled X andY) are at reston a oirix o 7hkf9+ 9jahi5m)f:8nhorizontal disk rotating at a constant rate about an axis perpendicular to the plane of the disk and through its center. The distance of the coinsn+k)i5h7xjo:fmfi rh98 o9 ia 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 end of ww(pcj0a/wrda 91 m,j string and moves about the string’s fixed end in a conical motion with aaw0d9r pwwjmc(,/j1 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 )xz 23zzeijr01mi +okuniform circular motion as shown in the figure. The string to which the m1 rjiz izz)oek2x03m+ass is attached has a length of L = 3.00 m and forms 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 tb;s xq)(n dia; qo6/kx(jir8jg+ lb4horizontal disk’s centeog iais 4;bq)6kjxn8(/d;x ( tqrl+bjr. The disk starts to rotate from rest about its center with a constant angular acceleration 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 ud*n81 xw2 jajxk)o/k.pse8cq z -sj4=1.75 m from the fi1k xjde s.aonq8c /*k xpj -4zsu)28wjxed center of a disk as shown in the figure. The disk starts rotating from rest with constant 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, with initia hh 5yk,b4nju0l speed 17.0 m/s. The object’s speen0h45k,u jhby d increases uniformly 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 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 iusg yg,s(hk-6n a circle, starting at the top, with initial speed 17.0 m/s. The object’s speed increases uniformly until it has ysgukh-g( ,6smoved 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 t2 k,o)h2px;o, oq rbcf05g7dm *mxjx qhe bottom of a bucket. The bucket is spun in a vertical circle of radius L by a rm 52ghq2j7*kx;m, 0rodxp,qf oc o)xb ope. When the bucket reaches the highest point in its motion, it moves just fast 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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