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习题练习:Physics Unit4: Force Dynamics & Newton's Laws



 作者: admin   总分: 85分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月20日 11:44  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  
  Which of Newton's laws best explains why motorists shouldb/o4mb+bxj lco5e g8+ buckle-up?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When you sit on a chair, the resultant force on c h1p,*otrxt(you is

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the absence of an external force, a movi;h,v7m1egd6 j ;hdlzk ng object will

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When the rocket engines on the starship NO-PAIN-NO-GAIN are s-sj.1 qq:g:8 )k uo+ 8hmeu9v;okup, dvbazcz uddenly turned off, while travuo8s.q ac z,m98+ eg :kb-djp vhu;kuozvq:)1eling in empty space, the starship will

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rocket moves through empty space in a straighzmm q1k 73uewbn*,gd /t line with constant speed. It is far ku g3dme 7/*q1mb,nzwfrom the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are standing in a moving bus, facing forward, and you suddenly fall forl/+/nxpb4 )zqn o.b ciward. You can imply fromoq/i.zc x)n4/ pnlb+ b this that the bus's

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are standing in a moving bus, facing forward, and you sudg6ujs,t dmu( /denly fall forward as the bus comes to an immediate stop. What force caused you to faj u/t (6msud,gll forward?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A constant net force acts on an object. Describe the m lmd t/cy4i)6*k1sux ootion of the object.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The acceleration of an object is inverseij0q /pn c3b9-pj-or sly proportional to

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A net force F accelerates a mass m with an acceleration a. If the same net forc5 cuwk 4;okazrk24vnqnh41 , we is applied to mass 2m, then the acceleration will zkon5wnk,a 4v h4u12k qr;wc4 be

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A net force F acts on a mass m and produces an acceleration a. ::ndi z/3dt qek.xs2i What acceleration results if a net force 2F :2dk. isqi3zx t/e:dn acts on mass 4m?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you blow up a balloon, and then rrpmdg ktmx23+l tw76 b,2wx b,elease it, the balloon will fly away. This is an illustration x+2xdl , b w63p rm2ktt,wg7mbof

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two cars collide head-on. At every moment durh4z:76bl( zni mgv(ju3:gbti ing the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnlz 6zivhm (gj: bu 4n3bi7:gt(itude of the force the second car exerts on the first. This is an example of

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you exert a force F on an objectt lw-jw+.z pilow16 s.g1xep7, the force which the object exerts on you willp7ljwie twl o6xg.+s-1. w1pz

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Action-reaction forc+d;3ywg kww z(6hzwawjm983 oes

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Action-reaction forces arew udf)h7f,et 2

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 20-ton truck collides with a 1500-lb car and c+4jzvz jqx71q auses a lot of damage to the car. 7jqjzzq +x1v4 Since a lot of damage is done on the car

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object of mass m sits on a flat table. The Earth 6 zor3mh2ls 7v i5lup4f8lj w1pulls on this object with force mg, which we will call the lh7m8 l s1p2f6u3v5 jiw4lzro action force. What is the reaction force?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A child's toy is suspended from the ceiling by means of a stra-hjg3 3k9m9/al vg zning. The Earth pulls downward on the nk a/g9z9jghlm 3-av3 toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Your bat hits the ball pitched to you with a 1500-N inrv) 2cfmr20 87 vfx/b0 jtu;zs/lnqq istantaneous force. The ball hits the batqv bfj0zr0cqx7s2rt2 )ilu; nv/m f8/ with an instantaneous force, whose magnitude is

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21#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Newton's three la( wh*,;tyfl xfws.
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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Mass and weight

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The acceleration due to gravity is lower on the Moon than on Earth. xwt ur *g n.e l0d9jpt*;*9oqh Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compa*d0.l* gutrp* h;owtqj en9 9xred to Earth?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An example of a force which acts at a di7 d.l1m1g- py7 mvzszastance is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Who has a greater weight to map+93.een; f*ukw0f6lya xki o ss ratio, a person weighing 400 N or a person weighing 6ex9fwp0f*ynoa; 3i+ .ek luk600 N?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is thrown straight up. At the top of its path, the net f9y/ qrd+kk0hm z*f;t morce acting on it +9kzf/t*kdm m;0qyrh is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 20-N weight and a 5.0-N weight are dropped simultaneously froj 1zv lgkpz+3l0o34 kom the same height. Ignore air resistance. Compare their ac3k v+4 3p0g k1ozlzojlcelerations.

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick and a feather fall to t1g-yxte5p m 7jhe earth at their respective terminal velocities. Which object experiences the greater forjm5 py g7xt1-ece of air friction?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object of mass m is hanging by a string from the ceilit8;ksi(tgtm;(8:g utdy2rdn (qn 4 oj ng of an elevator. The elevator is movug dtn n tmti;k:t8(8(r4(s;qoyd2 j ging up at constant speed. What is the tension in the string?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object of mass m is hanging by a string from tjd9;6 +aitnv ohe ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tenaoid9+j ;6tv nsion in the string?

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The force that keeps you fro(w9 p+v qfzy1nm sliding on an icy sidewalk is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  It's more difficult to start moving a heavy carton from +)(;5/f5kpwbn k3jhn myyn oprest than it is to keep pushing it with constant velocity, n/(5y hk3+ppkbyn;m5o fj )nwbecause

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force accelerates a box from rest (c kk9u ex88csk12xlzacross a horizontal surface (friction is present) at a constant rat8c 2kkxkx l8c(u1sez9e. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A packing crate slides down an incf/favm t4l .(clined ramp at constant velocity. Thus we can deduce t facl/(m4v .tfhat

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A block of mass M slides down a frictionletr6fwq.cj )oxst:p4hq /g..hss plane inclined at an angle q with the horizontal. The normal reaction force exerted by the planx p/..whfhr:s6)qcq g4 otjt.e on the block is

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A block of mass M slides down a frictionless plane inclined:8 nse)maqv8 p,hur+b at an angle q with the horizontal. The normal reaction force exerted by the plane b ,)mu8q+:he8vna srp on the block is directed

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A block of mass M slides down a frictionless plane inclined at an angle q withd0g7a g. vvr snnfr:), the horizontal. The gravitational force is directed 7rngsfnvd0rva .,) :g

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined p;-teq xdr1 5vjlane that makes an angle of 30e with the horizontal. Make a statement which best describes theirrv5qjd -e;1tx acceleration after being released.

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object sits on a f )do 27gymvta3rictionless surface. A 16-N force is applied to the object, and it 7y)2tgo3am dv accelerates at $2.0 \; m/s^2$. What is the mass of the object?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 733lqfkpy) xt 7x.u2oc.0 s. What i2.3locq)tx xkfu7p3 ys the average forward force on the car?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Starting from rest, a 4.0-kg body q0 5-wb/a3fgrv j*r1gcaowx 1a,zhs + reaches a speed of 8.0 m/s in 2.0 s. What is the net for*0v5bs q1orhxj/ + 1acazw,gwr f- ga3ce acting on the body?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An antitank weapon fires a 3.00-kg rocket which acquires a 15c 1yy ad4ln femgjffy-: b6ipgp)36speed of 50.0 m/s after travelin3g f:6yle 51)gypfimajy14- 6cdfp bn g
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push a 4.0-kg mass with the sa5(w) yk7hf,2q anoy lcme force that you push a 10-kg mass from rest(q25oyw,fan)lk c 7 yh,

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the mass of a person w1 vuar)7uq vhr6-t chp4i0i n3ho weighs 110 lb?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the mass of an object that weighs 250 N on the surface of the Earth wh)( omy1czy.lzojdh)-ere the accelerationmz j 1oc yz-)do(hyl). due to gravity is $9.80 \; m/s^2$?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object has a mass m* 00p:wtbcsb of 60 kg on the Earth. What is the mass of the object on the surface of the Moon where the acceleration due to gtb0 : pbcm0sw*ravity is only 1/6 of that on the Earth?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Moo; dk uki7 u(vx/ob iz6-u9qku7n's gravity is one sixth of Ezk- vik97qx(;bo6 /ukuiu ud7arth's. Compare the masses of the objects.

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sue and Sean are having a tug-of-war by pulling on opposite e2*2knkj2 klfy1wr dkk;p:bu8 nds of a 5.0-kg rope. Sue pulls with a 15-N force. Wh:l kkf*2d2;yr2p k8w1jk ukbnat is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stack of books rests on a level frictionless sua 0nvo27-bbv trface. A force F acts on the stack, and it atvn0o2-v ba7bccelerates at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person of weight 480 N stands on a scale in an e8thex 2c9 ql4k04v qntlevator. What will the scale be reading when the elevator is accelerating downward atq0 te kxltvqch84249n $4.00 \; m/s^2$?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person on a scale rides in an elevator. If the mass ofd/kyn /. ys1r5-hr;qu*qeff i the person is 60.0 kg and the e5hrsyrq/ u -d eiqf ;.fnk/1y*levator accelerates downward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person on a scale rides in an elevator. If the mass of the pek kz73kr-cdp:rg* f,8xoclj3 p. es-wrson is 60.0 kg and thzgpw 3fd8xc j:,k7 * rp.-3k-roskcel e elevator accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two horizontal forces am 3ik2xex15+w-el antct on a 5.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of 3-ekma52+t1ie wxxl nthe mass?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object of mass 6007n*kd7qj 8j lh0 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N7n8hd k jj*l7q. When the truck is traveling 15 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object of mass 6000 kg rests on the flatbed o,5tw:5mosx4b jt/ qgw:4yv e /cuxe5cf a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9 e:5eqcs o 4 t5vtww4x/y:xb, /ujmgc5000 N. When the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and mp6eua2m.u 6 kx yt4id1 = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction anui km64 px2 .eady16utd the mass of the pulley.)


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the Atwood machine shown in Fig. 4-1uze/ h6svh 5r-, if M = 0.60 kg and m = 0.40 kg, what is the tension in the string? (Ignore friction and the mass of the pulley./ev5h hzsu6r-)


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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A student pulls a box of books on a smooth horizontal floor with a force of 10+cri u0w .. 8auorz3vf0 N in a dir r u0aw.cvui8. +r3fozection of $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A student pulls a box of books on a smooth horizontal fl3 qb. er ta7boj4t -g5lhspy:6oor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the .yjl5 abq -hgtte6:4s o7r3pb box and the books is 40.0 kg, what is the normal force on the box?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A traffic light of weight 100 N is su gecvg,761 dukpported by two ropes as shown in Fig. 4-2. 7gkg,6d1 eucv What are the tensions in the ropes?


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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 4-2, if the tensions in the ropqo*9(u;tgxz :zar 0( cn+ihojes are 50 N, what is the mass of the traffic ligh;z+ho9t0orxi *c(z gq:n ja (ut?


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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two boxes of masses m and 2m are in contact with each other on a frictionless su/9zi0 0j q rtmven*u6vrface. (See Fig. 4-3.) What is the acceleram/jvrv n06 ieq0*9ztution of the more massive box?


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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two boxes of masses m and 2m are in contact with each other on;s 4xszy- njq1e05xy2bvfp 0x a frictionless surface. (xs;510n4jq svexbz0p f -y y2xSee Fig. 4-3.) What is the net force on the more massive box?


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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two boxes of masses m and 2m are connectdsm ow m,m(a l,b82l2ted by a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the tension in th ,m2d2sm(m l,twalb8oe connecting rope?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-nb.f5al1 b .y;adsidv*agajx b qu o88x7;q1+4.) If the forward force on b . aod*fgan;7 a b;1iux8qv ydlxbj5.+81sqathe more massive box is F, what is the acceleration of the less massive box?


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66#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Two boxes are connected by a cord running over a pulley as shown in Fig.4hst(n nz:8ch 4-5. Box I of tn4:( z8s hchnmass
8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coefficient of st0.uo r 5weml0katic and kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box lum0oe. r05wk when a 15 N horizontal force is applied to the box?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coefficients of static and kinetic f uaqsergj9p+ a:*tk 5bz -m:j0rictions for plastic on wood are 0.50 antamp5 *a+rs:-e 0gjkquz : 9jbd 0.40,
respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides on a level surface in the +x dir po6iwbjkz/s h7as48(nhfm u v.1) (unection. It slows and comes to a stop with a c f)7ao4u1/m.(s nbhh wpukn8 (izsjv 6onstant acceleration of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg box sitting onh1ezcg gcj /fc)57;wr a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction forcge gj7; rh5z)cwcc1/ fe retards the motion. What is the acceleration of the object?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 5.0 N accelerates a 4,a59mj hec a/u.0-kg mass, from rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  During a hockey game, a pucp upnc/jhk3(9k is given an initial speed of 10 m/s. It slides 50 m on the ice before icpnu9 /h( kp3jt stops. What is the coefficient of kinetic friction between the puck and the ice?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  During the investigation of a traffic accident,i) wp-lk6efry52v0yo police find skid marks 90.0 m long. Theyy fv2ip0ly6eo k)5r -w determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The sj0ohs rmxw u3n+ di.su6r57 )ourface between the more massive box and the horizontal surface is smooth and the surface between the b)nr6 uo 3oxm75sd w .r+uj0hsioxes is rough. If the less massive box does not slide on the more massive box, what is the static friction force on the less massive box?


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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two boxes of masses m and 3m are stacked. (See Fig. 4-v.)/+ktr leb p6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massiv) t+r pk.l/beve box does not slide on the more massive box, what is the coefficient of static friction between the boxes?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is on a frictionless inclined plane. The plane is in,isg -y4(0e2jm9hji 0 kurd.ve; lscpkjt 2t-clined at an angle of (2hji - ketvkg4 dji 2 tuc.yp,0;0j-msrel9s $30^{\circ}$ with the horizontal. What is the object's acceleration?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass slides down a flat hill that mjy9,2bz )uo pdgjr3 y4g9ad7 kgpk */makes an angle of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A mass is placed on a smooth inc -:en6dhqt vu+lined plane with an angle of $37^{\circ}$ to the horizontal. If the inclined plane is 5.0-m long, how long does it take for the mass to reach the bottom of the inclined plane after it is released from rest?

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79#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A block lies on a smooth inytg3(: +c . srug0f9mdcph;qgclined plane tilted at an angle of $35^{\circ}$ to the horizontal.
(a) Draw the free-body diagram for the block.
(b) Determine the block's acceleration as it slides down the inclined plane.
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline.
(d) How long did it take the block to reach the bottom of the inclined plane?
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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wooden block slides direo w .zs6jjm ogu2.4ce*ctly down an inclined plane, at a constant velocity of 6.0 co. 2wuz4ejgsomj6.*m/s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object with a mass mpzn,f;1.(rxf an8t lz slides down a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object with a mass m slides dy7 zwpf yss:df(s 39an36za3xown a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. If the plane is 10 m long and the mass starts from rest, what will be its speed at the bottom of the plane?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bulldozer drags a log weighing 500 N along a rough1cpve d2vx 4n- surface. The cable attached to the log makes an angldvv41-exp 2nce of $30.0^{\circ}$ with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move?

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84#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A 25.0-kg box is released from rest on a rough inclined plane tilted at an a54 s:l,n+m7laoxc(t g slm tz+ngle o:(zm+g7al4stn t , +xo5llsmc f $33.5^{\circ}$ to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200.
(a) Draw the free-body diagram for the box.
(b) Determine the force of kinetic friction acting on the box.
(c) Determine the acceleration of the box as it slides down the inclined plane.
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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is placed on an inclined t*msy qfhr n-vp1,4(qz0s,hpplane. The angle of incline is gradually increased until the object begins to slide. The angle at which this ocfhp,srphqyz(n- s ,t0v*4 1qmcurs is q. What is the coefficient of static friction between the object and the plane?

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