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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 acco/ hpiqx6w2no t7v7l 4jmpanying figure moves in uniform circular motion. Which72 p qvxiwn/tlo6 j47h arrow best depicts 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 Wheeltjjlqb5 39(b1qe+kk r seat that rotates counterclockwise at constant speed at an amusement park. At the location shown, which directionbqleq(19b k 53j +krjt 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 continuously moves in a he;s 7w2s4zodcircular path at constant speed in a counter- clockwise direction. Consider a time interval dz2s 7os ;h4dewuring 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 mfkrr;tg -ui27x.7a)upi b k1uoves in a circular path at constant speed in a counter- clockwise direction. Consider a time interval during which 1r i);pr7ga7 u k.2ubk-iuxftthe 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 clockwi9dup2 )ay)7wgv)rv wjse with constant speed around the vertical circle shown. Which arrow best indicates they2)pu)ra 7)g jvvww9d direction 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 6df+g 96onl qwnc vm+7connected to the end of a string counterclockwise in a horizontal circle above he9mo 6+6+cg7lvfn wqn dr 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 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-shaped path as sh7(zv:*p0 q4zpugn/ahpi3 re(q / svtyown with the ar/psv q3va ( pt07yz(gp *:zheiqn4r/urows in the figure. Which one of the following choices best describes the 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 Moonwg+;wqe160 2ix azymg perform an experiment with a simple pendulum that is released from the horiz 61wgg2 ;aw+i0xq zemyontal position 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 the center of a roughbc+mkmtvf,9/g 82hl k turntable as the turntable rotates. The period of the turntable's rotation is 5.0 seconds. The coefficient of kinetic friction between the +/kb 8f c2ltgmm9, hkvobject 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 p)4o* a o/flpsri0i+ajuck moving in a circle of radius 0.5 m on a h/l+ar*o0 s ) pio4ifajorizontal 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 accelerationjyl 33zx0v ,co(rjtd b)6qr2 r of an object (mass = 50 g) on the end2yj60v tc3jdb(,z o qxr)rr l3 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 moves along a horizontal circular path of radius 0.8m with aqq 7+sl guce-7 *wofc: constant kinetic energy of 128J. Wha- cq:lcqe+fs77go w*u t 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 atvku,r 9sqs,3z tached 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. The work done on the ball during each r 3r, 9s,qvzkusevolution 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 /j zkb2e4p4 9yzgpw,n ball at the end of a rope, in a uniform circular motion. Which of theyp/4 nzk, 9j24zwbepg 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 craft attaches a mass m to a sp6uid 2ko74zw q0vr2wtring and whirls it around in uniform circular mo dv2kw2 o4rqz76uwi0ption. 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 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 ou2o;fltg8con e3 j6 )ya-czz p*tward until the string of length L to which it is attached makes a 90- degree angle with the vertical. The mass is released from rest any *;pz)n2o6fao8 lzt3ge -cjc d 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 xkv qb; bm .*llte(ml++e6me ;a road in hilly terrain, see figure to the right. Assume the c;mlmvtxl+kl b emebeq(;*6+.ar 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 ja). de ;r3iaqat a constant speed of 12.0 m/s. At the very top of the hill, the shape of the road can be approximated as a circle with radius 25 m, as indicated in the figure. Which one of the followingr;jad.3 ie)q a 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 c kskl)pb: wz yvw -*08au2sys3ircle at constant speed. The magnitude of the net forck apy-byvz0s3wws :l* s82)uke on 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 b igof+s+4:: 1rvfmhs 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 magnitude of the net force acting on the mass. Which one of the following choices describes th1s +v :h 4fm+:igrfbsoe 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 connectrw58cfzn fanv,v0-lt;(t .fhed 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 vaw5 f(f.tn0 c zntrv-;8l, fhacting 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 newtub84pa i si d3l 2+s)fbq06k8 nnl8tcnons is applied to a rubber stopper moving at a constant speed in a horizontal circle. If the same force is applied, but the radius is made smaller, what happens to the speed v, and the frequency f, q88b6plbi 4 a2nk ) l8csin+sd3n tuf0of 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 7inl8lzu tto 5r;+1m nat rest on a frictionless 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 mass connected to it is now doubled to 2M. If the spring is extended back + lz8t51ounm tlri7n; 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 consta1bhtxjmmt s/)ef 5 avxon9ejb*n3mu(u 9 ;).hnt speed of 3.24 m/s in a vertically-oriented circle of radius 0.75 m. What is the net force acting on tm v h)9x;1baetf)n.t u*mmouj9 s n(hjxb53/ehe 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 coins (labeled X andY) are at reston a horiz.xs go e839 mnya-tp3oontal disk rotating at a constant rate about an axis perpendicular to the plane of the disk and through its center. The distance of the coins from the center of dis-33tnp ey8mxg o.9ao sk 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 connechwe sr0fh 3*whqmep gq3 -phd0t7258cted to the end of string and moves about the string’s fixed end in a conical motion with a constant speed of 4.0 m/s. The string has a length of 2.5d3p5f he23wrtpq7 qm0sh8whehc -*0 g0 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 motion as shown in the figure,3rmu w2,ap4kp4psbb.( xpy,yo 4lr+u (zjvy . The string to which the mass is attached has b3p(,ry yb2yx,p ukz.4m4(r,loup4saw jpv +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 horizontal4 ry hc).3gisgn5cqxa 6vy7q0 disk’s center. The disk starts to rotate from rest about its center w.67grn gxi3a c)qqcy04sy h5 vith 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 ayhx1zn:yt,/ mttached a distance R =1.75 m from the fixed center:/ mz1 yt,nhxy 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, withbq by1p9 vwsz*f0)g* e -l*wae initial speed 17.0 m/s. The object’s speed increases uniformly unyl0ba9*b)-f q1zsw geew*v p*til 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 in a z m ,y:30iotuicircle, starting at the top, with initial speed 17.0 m/s. The object’s speed increases unum3i,t zi yo0:iformly 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 of a bucket. The bucket is kpwg ikix2)uml+xdutos)*;7 :/d hm3 spun in a vertical circle of radius L by a rope. When t /)lmo;hus :dptd2g+ix7k ik3wx ) um*he 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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