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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 acls4v69 kp dtq+companying figure moves in uniform circular motion. Which arrow best depicts the net force acting on the object at th+ sqvk9 4tp6dle 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 rotates countery 61dx6mi6sihclockwise at constant speed at an amusement park. At the location shown, which direction best reprx hy d16mi6is6esents 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 circmq1 *o(q1 ggm a;3w,7no5c kbwm4whwrular path at constant speed in a counter- clockwise direction. Con *;kcw4o m omm5wawwh1bg r7,q(gqn 31sider 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 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 constant sm0 y1hefozmf50v zd0k:)h fg.peed in a counter- clockwise direction. Consider a time interval during which the particle moves 0ff yd)o: 0e hfvm.hgz5kmz10along 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 wd to.ebc-mw 53ozdh ;4ith constant speed around the vertical circle shown. Which arrow best indicates the directionwd5;cm d4oe tz.h-3 ob 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 rtdlh.wyf)3p mrh:xes;7 32 t the end of a string counterclockwise in a horizontal circle above her head. The figure shows an dx;lh tetw mf.h :rp)ys273 3r 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-sh-84)u s vzcazwh 1.fi; e1ijdtaped path as shown with the arrows in the figure. Which one of the following choices best describes the direction j wes-tc;hvz1.4)8a1ziud f iof 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 gvd0q09- lsx xlp.fk9perform an experiment with a simple pendulum that isf vx9g0l-90 qlp .kxds released from the horizontal 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 roubm(2 xynxg -)ogh turntable as the turntable rotates. The periodbxgm no(yx)-2 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 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 -so428j;y .zzpfxw rvezfq 5(moving in a circle of radius 0.54v -j52szrx8.(zf z;w yqefpo m on a horizontal 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 acceleration of an object (mass = 50 im apq5e / 7d,v8)kt7;mdcf cfg) on the end of an 80-cm string rotating at a constant rate of 4 times a saq7d md ,7c8 tki5cp;v)fm fe/econd?

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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 withfm kfwj sd)t4g(lkn;4:i/ c,j n hlr-- a constant kinetic energy of 128J. What is 4j-, dt ;nlfwi nj(sc: gmkhrf/k 4-)lthe 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 attached to a 0.80 m string and whirled ;uxa pr0ysxzop7; cd)t5o+ e1in a horizontal circle at x 0+;tdopcu op y)eas z51rx7;a constant speed of 6.0 m/s. See figure to the 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, in a 6 h1fqgg7-r:conyx j+uniform circular motion. Which of thn 6g fj+cr:yo7g-h qx1e 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 masw 0q/g0p,b- liemi m-bud6i(j9 b8mdos m to a string and whirls it around in uniform cir db8,iib/69qmbo-u ejgpd 0mli-(w m0 cular 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 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 stv)h 6df0 xl-xgt s:7 wyh5lna* h,j7itring of length L to which it is attachedjltn :0t*xyfad,)v w hs56i7x-hl7gh 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 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 r +may3 hhcmau 7(c/,fifm 6pc1oad in hilly terrain, see figure to the right. Assume the car has speed v and the to,3mc7 h6afpha1 uccm(fym+i /ps 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 12.0 m/s. At thnn yrb;r0-4 a, yhnnf.e very top of thr-0.;rfnnnby, na yh4e 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 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 spee6 u(u oof;k;gxd. The magnitude of the net forcef 6ouxk u;(og; 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 from r+u(ix52shqdr est from the horizontal position shown. In the absence of air resistance and friction, the mass swings throughdx (+ sriq2h5u 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 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 qssbyz/z7.z 2string forms a simple pendulum. The mass is released from rest and undergoes simple harmonic motion. Which one of the following choices co7s zb/z.qy2 szrrectly 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 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 sto6 aq0w-af3yjvpper moving at a constant speed in a horizontal circle. If the same force is applied, but the radius is made smaller, wv yj6w afaq-03hat 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 fricpbg qy:iqj v5aa(6 1u4tionless 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 30 cm from equilibrium, what is the necessary force applied by the person to hold t1(: bg uaqp64ai5j qyvhe 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 47 mdi4 c.la6dm0xx :e sf4vw-* .ichnz.0 kg mass with a constant speed of 3.24 m/s in a vertically-or: fd04n.d*sc v- x4lz7aimimx6w ceh.iented circle of radius 0.75 m. What is the net force 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 coins (lab(uh 4xe y( vgq8 kdue0kk/s0z2eled X andY) are at reston a horizontal disk rotating at a constant rate about an axis perpendicular to the plane of the disk and throughu ue8k/ v0xdy2eqs04 ((kgkh z 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 imfav 9:y jcs:4s connected 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 hm4 cvf a9j:ys:as 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 uniformhh p gpp9erig72:s.:k circular motion as shown in the figure. The string to which the mass is attached ks:p ipgg.e:h92pr7 hhas 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 8hu .g tw,v3zcat rest 30.0 cm from a horizontal disk’s center. The disk starts to rotate from rest about its center with a constant angular accelh , uzg.wctv38eration 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 disfy)lf,g)uq(ir8wft cq; )z i1tance R =1.75 m from the fixed center of a disk as shown inugy(1wif;8fr l q , )fizcqt)) 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 circlgp 3eky2rmn6 0d)5l nte, starting at the top, with initial speed 17.0 m/s. The object’s speed increases uniformly until it has epkn6l 53 2md)g0t rynmoved 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, starting agy x5gakg90l teq/0o o9;uj8rt the top, with initial speed 17.0 m/s. The object’s speed increase9k 8qug5le/ oxt0y;r j 9aog0gs 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 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 buznf+y6 y.u)w7crvux, cket. The bucket is spun in a vertical circle of radius L by a u u.ny rv+76)w zcyf,xrope. 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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