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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 in uniform circuvn59i+oxe(*xo otu y6 lar motion. Which arrow best depicts the net force acting on the object at the instant +oeu6i *9yo(oxvxn t5 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 Whee))wmso rrcfz 40gnd1379zngkl seat that rotates counterclockwise at constant speed at an amusement park. At the location shown, which direction best represent3z1k0od rgwz4g7s)f mnr )9ncs 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 circular path at constant sx4.vu 8 b.3)xhzqkg as1acpb3 peed in a counter- clockwise direction. Consideq..sg3 aub8 z xx1kpb)3v hca4r 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 cons(v(8;l33cs aurexnmc kr v7h 0tant speed in a counter- clockwise direction. Consider a time interval during which the particle moves along this circular path from point P t3kc;recxhun78svv( (a rml30o 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 around the vertical vi7e2n: ;pcxlcircle shown. Which arrow best indicates the directcxe i;2:nl7 vpion 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 f;2 knu1 9lb)kruux n.the end of a string counterclockwise in a horizontal circle above hel9un.1 ;fu2x nurkbk)r 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 owai 1;fgwsl63, av,wb3 gmd)hds8 g4a horseshoe-shaped path as shown with the arrows in the figure. Which one of the following choices best describes the direction of )lf g 8bg,s va4;1 ma,wo3i6wgd3w hdsthe 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 perform an experiment with a simple penduuk*itoo3ye7xl: e omg xq p)7p/, .l;llum that is released from the horizontal position at rest. At the moment shown in the diap;ooloee* .)m tqx7:pi,k / y l7g3luxgram 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 fs3 p(61 )tp3 tjmtdcvvne;d7qo/v bu;rom 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 friction is 0.80. What is the magnitude of the force of friction acting on the obje/pdtnoq u vdj;(v 36); svbmpt13c7etct?

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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 moving in a circlpmeh1+5mnv zrgfz;3 ;cfgrqno/. l :/e of radius 0.5 m on a horizontal frictionless surface with zmn/pe.g ;hl g r1m;f/fn5 qr +vozc3: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 g) on thead) 1o6luvzm.2wv ff75p jae3 e fj+t: end ojl. o5 ep6fe)7u1a2vta mwffv+j:3dzf 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 rad+bwyktr554l6+u az omius 0.8m with a constant kinetic energy of 128J. What is the magnitude of the net force acting on the mass as it m5++a5b oltzwuk 46ymroves?

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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 amj:a6 poaca2f u 87jwo q;xo/5yxiy9r.vo(v+nd 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 e8(r2awa/u v7+ xqyxo 5ocoj;jyf96:.vampioach 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,y nt2v d;8y,dz in a uniform circular motion. Which of the followin ;tzd8nv2,ydy g 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 spac z)ip)vuiba2(dni q-0e 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 uniform circular moni)0aibp(vq- )d2uz ition 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 -ro inr)p,y)o it is attached makes a 90- degree angle with the vertical. The mass is released from rest and swings through a )orr po,i-ny) 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 road in hilly 9ui-+ owp6yr +rnkkw2/g 7jfoterrain, 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 feel jr+ 96i fkyp7r/go-+uww nk 2oweightless:


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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 0x ena 7. hzkih20bg0lhill at a constant speed of 12.0 m/s. At the very top of the hill, the shape of the roahei x.0h gn07 l0kbz2ad 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 pww6v( 1:-dd*b+lmoj-yh9 5lnnr7o ms6djpa a vertical circle at constant speed. The magnitude of+pa*lj1r7j v-mhy (donl m-ow5wd 69d:6bs pn the net force 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 frly7;fh 0opp* fom 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 the relationship among these forces when the mass swings at the bottom of the arc (poinp; phy7fl of0*t 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 string forms a simple pendulum. The mass is /rnrad, r -jo r(ohx(0wqd0+nreleased 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 orn(qnrhr0,oddow/+0r(j a - x n 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 appl,g..ebl9x1* puekt ykied to a rubber stopper moving at a cobk.u,t l*eg ykp .19xenstant 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, 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 frictiw6uaeu+d12v r lpd87nonless surface, connected to an ideal hori u867lar+ dewvdp21nuzontal 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 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 constant speed of 3.24 m/s iqu*kyod ,zui8i/p( n ;n a vertically-oriented circle of radius 0.75 m. What is the net force acting on the mass when it is at th/iikzy*d uqo ;,u8n (pe 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) aredvx) dd,smc 22 at reston a horizontal disk rotating at a constant rate about an axis perpendicular to the plane of the disk and through its center. The distance of t2,x2dvmd)cd she 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 end of string and moves about the strizq:7 r8oe22it/vbna9 km caa-ng’s fixed end in a conical motion with a constant speed of 4.0 m/s. The stri2oi7v/eqr8nta k2 9 -zamcb: ang 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;h 5+ chl .wx9i1hlnfs is in uniform circular motion as shown in the figure. The string to which the mass is attached has a length of L = 3.00 m anxhf591lwih;lc .+ snh d 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 horizontal disk’s/q1xf k9uingbr+z8 jyz+lz t9.un jo4w 8-1nf center. The disk starts to rotate from rest about its center with a constant angular acc/f8-9j1yrgf.xub+z jo+iwzn8 4nlu qzk 1 t9neleration 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 ixif2 .e eov/ami ea6ub:(5+qoq7 m4a=1.75 m from the fixed center of a disk as shown in the figure. The disk starts rotating from a/m qe .27ivof e5:(aiebmiq+ 4 x6aou 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 initial speed 17.dt,dxv-0 p 1ws0 m/s. The object’s speed increases uniformly until 0 wvd1ds,p -txit 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 circle, starting at the top, wvhc 7ve;4cfjy.4hpb3ith initial speed 17.0 m/s. The object’s speed increases uniformly until it ;j p44v3evc hhb7f.cyhas 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 spun gy.a y.x yd.hrbd yp;,bl*)c3in a vertical circle yrx.ygl.ab dh.3y*dcpb ;y) ,of radius L by a rope. 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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