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习题练习:Typical Forces



 作者: admin发布日期: 2024-07-30 12:44   总分: 25分  得分: _____________

答题人: 匿名未登录  开始时间: 24年07月28日 14:37  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  
  07.10: Contact forces are examsd)h .oli2 cjn/a7,a qples of which of the fundamental forces?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.02: Which of the following terms is NOT relat;a .s bzu9posn y; 3b5x/3syiped conceptually to the others?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.20: The graph shows the rel17dva r,+kk:mt j,z unationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a representation v +jdn:r7utk,,ma zk 1of the:



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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.15: Three blocks, labeled A,B, and C, remain at rest on a tab dxq ;6(y2hx(zh1xzi l hy2c)cle. The magnitude of the gravitational force on each block is indicated on the figure. What 2cqh;zcdxx h 1 hyx)zliy(26( is the magnitude of the contact force on block C from block B?



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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.04: Three equal masses are suspended from a clhiofv)g (6 xm mip(o.i9rr5k+assroom ceiling by a series of strings as shown in the figure. Which string h(h5i omr .i9pi r(mg+v6kx)foas the greatest tension?


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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.05: In the figure shown, the mass 5g*e5sf2 tztp7bo p6y m = 6.0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following c5p*byf 5es2ztg 6pt7ohoices represents the tension in the string connecting the masses?



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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.13: Which one of the following scientists is most associated with the zbe6 n)jolgvx/*jc7, following statement: “For smal6xovlbecj*nz7, g j) /l displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  94.26: As shown in the accompanying figure, a force F is exert8 rhvxm5 rqy:9apwi7 3ho/fo0ed at an angle of 3 xo7y /hhv ri0:arwpmo58q 9f$\theta$. The block of weight mg is initially moving the right with speed $v$. The coefficient of friction between the rough floor and the block is $\mu$. The frictional force acting on the block is:


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.34: A student pulls a wooden box along a rough horizontal floor at coc2/ lonbvog 9oc94; o:bzqt6fnstant speed by means of a force P as shown to the right. Wh4 9foqlgtbvo; onzcc2/ o :6b9ich of the following must be true?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.08: A weight can be hung in any of the follo2pk70 zcznxo3wing four ways. In which case is the string most likely to break p7zz2nc3xo0 k?


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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  96.39: Assume the objects in the following d)oi m:zo-bn4t3rr a)niagrams have equal mass and the strings holding them in place are identicab:rzrmnn)o 3 ito-4)a l. In which case would the string be most likely to break?



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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.10: A person wishes to accelerate an object upward uniformly. Which one of : o)o/7c8c giy z(v ,qyiaxk8hthegqi (8:)ka8 hv/iy,czo7x ocy following choices must be true of the force F, provided by the person onto the object? W represents the magnitude of the gravitational force acting on the object. Ignore any effects of the air or of the Earth’srotation.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.12: A 5.0 kg mass movesoaey z2c h*e6clg;wagd05 x *8 along the x-axis, at one instant of time, the mass has position8deac *lce yh0 5x2g;*oa6wzg 2.0 m, velocity 3.0 m/s,and acceleration $4.0\;m/s^{2}$ . What is the net force acting on the mass at this instant of time?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.15: A 4.0 kg object is pushed to the right on a rough suz(0b8d 7 e+rie+ hxolxrface by a horizontal force of 15 N as shown, during the push, the object accelerates uniformly to the right ze+edl+ixx 0o(7rh8 b at 2.5 $m/s^{2}$ . What must be the magnitude of the force of friction also acting on the object during the push?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  96.32: The 10.0 kg box shox sj3chij a.p rbm 3;6v24b*(zcnpjo7wn in the figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficienj3 r.hca;vxm 2p7bib4jc pj63n zo *s(t of kinetic friction between the box and the floor is 0.20. The box is moving with:


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.32: A block rests on a flat pwa3dal- tuiy0ee.lqq9-3o m8lane inclined at an angle of $30^{\circ}$ with respect to the horizontal. What is the minimum coefficient of friction necessary to keep the block from sliding?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.32: A wooden box is first pulled across a horizont-i 9rkwz3vzb1 9pfg*ial steel plate as shown in the diagram*zwzf ik9i-v9 31 bgpr A.
The box is then pulled across the same steel plate while the plate is inclined as shown in diagram B. How does the force required to overcome friction in the inclined
case (B) compare to the horizontal case (A)?


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.09: A block rests on an incline that makes the angle θ with the horiz;ysh/e9pzmxbbbhl+ ,l; + tc-l)mpu )ontal. The block remains at rest as θ is slowly increased. The magnitudes of the nortp/,uh ; b;hp+yxll) )ec+bl-mzm9b smal force and the static frictional force of the incline on the block

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.11: A 5 kg block rests on a flat plane inclined 3omxh/(ah e+dat an angle of $30^{\circ}$ to the horizon as shown in the diagram below.

What would be the acceleration of the block down the plane assuming the force of friction is negligible?


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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.12: If the block is placed on a second plane (where8 rqal:eq* wh9 friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force of friction between the block and the second inaqeh98qwl *:rclined plane?


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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.08: An object on an inclined plane has a gravit 6n*l uxa2yw,tational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coordinate axes shown in the figure? The y-na l, x6y*u2wtaxis is perpendicular to the incline’s surface while the x-axis is parallel to the inclined surface.



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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.13: An object is being pushed at constant spee:fk*n,tin6y*0 ptpr ed on an inclined plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the applied external push parallel to the incline by F, and the normal force with the surface by n. Which one of the following choices represents correct rela,tkpt*i 0pryen fn6*:tionships between


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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.20: A person pushes a block of mass M=6.0 lyfzq 23p2 :,t9-nuvdnqgx9pbb.q rlb x.5l 2kg with a constant speed of 5.0 m/s straight up a flat surface inclined9,b ypxnq.-p 2flq:lzb2xvg3 qtn 2u5bl .9r d $30^{\circ}$above the horizontal. The coefficient of kinetic friction between the block and the surface is μ = 0.40. What is the net force acting on the block?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.20: A uniform block of mass misplaced on an inclined plane of angle θ . Wh 4 *ysk(yl5hx8vj9xd len rexs 49 dv jlh*yy8x5lk(leased, the block does not move. It is determined that the normal force acting from the incline on the block has a magnitude of 62 N while the force of static friction acting on the block has a magnitude of 38 N. The coefficient of static friction between the block and inclined plane is 0.92. Which one of the following choices best represents the mass,m, of the block?


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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.40: A small object of mass M is released nang72eemeh:ns gpx eh7,..* from rest at the top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the hora.2e nm7,.e:xehsn*en7gh gpizontal. The incline remains at reston a table as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?


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