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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 oosek3 z6dm ;.why motorists should 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 forc +vps9jw(l;1sugg d y2e on 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 moving object wm f+ )/hbzisyu;hheyl n0,g 1(ill

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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 suddenly turned ofxg1h/mxzo50 go;ss.y f, while traveling in empty space, the gg;05 sh yxo/zm.1 osxstarship 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 aaj(wu 18sf5d h straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in orde (d5fa8h1 juwsr 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 uv8dpv7a (d0j suddenly fall forward. You can imply from p v(v8ddju7a0 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 movil4r)qwo ) .lqhng bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forwarl. o4h)q l)wqrd?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A constant net force8 ):a ov k;g8pk7)wnep nrooo0 acts on an object. Describe the motion 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 ii *+kxrklcm wv, r1-i.s inversely 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 c,29tz0f8pcu ounzhv a*e53 wthe same net force is applied to mas,5hcu8nv e z20zc o t*fwu3pa9s 2m, then the acceleration will 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 md/7x,n* p,p mmyo(a8si hlff; and produces an acceleration a. What acceleration results if a net f/p p*iafm o,s8hfmx7,;( dynlorce 2F 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 balgm0r2c01 urqwpw tepj5 d7ru9m5.n6 p loon, and then release it, the balloon will fly away. This is an illrtgpe5u5m2w0.0rp uq wj7cdp1nr m96 ustration of

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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 during the collis;rw)rk zews53f ocfcte-o4e,z7x 77 nwni3:q ion, the magnitude of the force the first car exerts on thoqi:zezr)co 5 , c7;r4 xsnktw f3w37e7efnw-e second is exactly equal to the magnitude 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 object, the force which the1ylm0*y8jkupoff n6i,-q ,mw object exerts on you wil uiwl,of,6mfj -yyq8n*p mk10l

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Action-reaction forces , .xvib q0wc4wlbw.:s

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Action-reaction forc7k6yjamu ; 8d-7zc qjfes are

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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 collidesd2r * wztqx*3,e,jgjjp4 g g-s with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage iw4gqxg ,3*djp j-r zjt ,*ges2s 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 pulls on the+1 s9iww/bhdis object with fore i1h 9wdsbw+/ce mg, which we will call the 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 suspen)y jea9t6e bj)ded from the ceiling by means of a string. The Earth pulba te96y)j)jels downward on the 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 -wp,rja-f(3.kx opsy pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantanep(.syf3 xow, - jr-apkous 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)m xs k*8e b9kbea;/mutyu ;z-ws.
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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 w0djzs/3: s/ dx;hda.l8hq-k4kb mh m Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's dmm8k/ whss0kq/3hdj ; -lxhzadb:4. surface, compared 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 di kukrh5ib*w2cc01:l fstance 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 mass ratio, a person weighing 400 N or a person weiu-ux+s ms sbg7l.lb ::78ef zvt-:vnighs8bnx u ul.bl+vgs7:vi:ft -z: - em7sing 600 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,l a 0b4e8we3fmj+123z,ias jw-n pknd s )o/xq the net force acting on it i 2e enam,wkqjsani1+3db80w)p3o4 sz -fljx /s

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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 simultaneosk6,sjdcp)x mzd 2 ;b+usly from the same height. Ignobj6sd; +ms,p)k2 zdxcre air resistance. Compare their accelerations.

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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 the earth at) lxde* rt:ihnn/tc6mf+dz,- ca7/ gb their respective terminal velocities. Which object experienr dh +tn e -ft/x:/,lcc6zbngmda)7*ices the greater force 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 vq(2 c9jjh5wi fk6yz04mfjfqs x1 v))string from the ceiling of an elevator. The elevator is moving up at constaj6jy4hqz(m 0x fk 95s)ifjv1 cw)f2 qvnt 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 hangin673nv:b*os s- tnwiih g by a string from the ceiling of an elevator. The elevator is moving upward*36 ws7oi :b nvhn-tis, but slowing down. What is the tension 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 from sliding on an icy sidewal0nmgr)sq9seh u*7 j;n k 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 -ytfx* x tx/0jy, ,eh+rm2apy i2l0vr/j0kdc a heavy carton from rest than it is to keep pushing it y hj0l+m/022ta ,i /x vex0xjyk,rptydcr-f*with constant velocity, because

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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 across a hog2ve d vm 7h,wqqxh/sm b8(*+lrizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the hod(xmge8 *vh+l7vbshq 2w m q/,rizontal 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 inclined ramp at constant velocity. Thus we c2 0xrot iny. x7 (lnos3.igtfdf-z9v 7an deduce that( iron7x ng.2 9y-if .3lt7xzvdfs0to

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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 frictionless plane inclined at an angle ps5ylk u+fg n3:c-cye 9i(,req with the horizontal. The normal reaction force exerteic :5 yyul( e9pef3nkscg,+ -rd by the plane 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 frictionlespqx (sat;g:0- tqk op. reqo)2s plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on2ats)xq:.opp e0tq ( ro-qk ;g 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 inclined9rx 6rklok. 6l at an angle q with the horizontal. The gravitational force is directedkrlxo lk69r. 6

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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 simultane432 wcubnq7ti1lmk,n ously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which beswi742um bn lq,cn1tk3 t describes their 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 frictionless surface. A 16-N force is applied to th(4og) sl8wwl(dpo-tw ch) b 7f8(lim ke object, and itbg)co4 wmld(h 8w)so- lt7p8k(il(w f 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 7.0 s. Wha fxgd8k6,a/r,kg:-: prd won rbvb,m5t is the average forward for:/bfv n6 doa,kgrg,m r-w 5,d8bkp:rxce 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 4.8w3jn61*xvo a fms4e l0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force aesn6j3wo vaf 1*m8 4xlcting 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-ks yvs *:eqt*-ac7t 8hhg rocket which acquires a speed of 50.0 m/s after ty*svteh*h:c s - 87taqraveling
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 same force that you push a 1i4 7i+kitss w40-kg mass from resti+ st4 wiik74s,

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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 qnclaw 5s :um8e)v jss2c7* vf 3ak r+2udy,b1person who 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*m/dbagb8 ztw,6c 39wh/ma t f of the Earth where the acceleratgaaf/b/mwhm9*,d8t w 6 czb 3tion 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 of 60 kg on the Earth. What is the mass of the object on iwgz9cd h 3*,athe surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Eai* hcw gdz,a39rth?

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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- c (ri:p flr9;6nfswi B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Compare the masses of the rpwci6:ilf (r;s 9- nfobjects.

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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 ends of a 5.0-kg rx: ejjjwrhs6c:9 7h4oope. 97hhejr:4 x co:wj6jsSue pulls with a 15-N force. What 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 a094rykj 2u idb level frictionless surface. A force F acts on the stack, and it acceleratekj94d y bi20rus 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 sr:6hnrt.+k.i cl*+ jpy n)0w la65gakl cf9wltands on a scale in an elevator. What will the scale be reading when the el:* n kl6ic r. lkpc95 jwh6+f+gr0ltalwy.)naevator is accelerating downward at $4.00 \; m/s^2$?

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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 of the persd qy8vm; fz j3xs .u6c+)tcqb2on is 60.0 kg a3q;b).j682dvxcuqcfz y tm +snd the elevator 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 eleve0c/ 2/ryo/s*tbakt ws kv35pator. If the mass of the person is 60.0 kg and the elevator accelerates upward with /3vpsrkyb 0k a/w2o*e cs t5t/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 act on a 5.0-kg mass. One force has a magnit a.8 d0stf;fhng kft(j4-bz1 ozv79 qcude of 8.0 N and is directed due north. The second force toward the east has a magnitude bfns8(k;jvt- d4 9f.1 c0 gfoz7zhtaqof 6.0 N. What is the acceleration of the 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 6000 kg rests on the flatbed of a truck. It is he47u p6(1kzelig 9 dmebymf2 y)ld in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping distance if the load is not ty21bk fd(izlpe9)6y u4mem7go 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 +rpjs.y+ o21qn3 hkrqon the flatbed of a truck. It is held in place byp ojh2n+1 r+qys r.q3k metal brackets that can exert a maximum horizontal force of 9000 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 = 0.60dsv 41gh *c o2*yehf1q kg and m = 0.40 kg, what is the magnitude of qg14 s * hcfhev*yo1d2the acceleration of the system? (Ignore friction and 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. 4-1, if zs6m t5uw3dozc9;a3g rivi 08 M = 0.60 kg and m = 0.40 kg, what is the tension in t0s ;w mdgic3z z36ia8 rv5to9uhe string? (Ignore friction and the mass of the pulley.)


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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 o//8mc1-*7;ri e ntanzu lixmsmooth horizontal floor with a force of 100 N in a direc-1/z8n iumc i/ l7*rxtone m;ation 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 floor with a force o g*1bbvpvzr 7(f 100 N in a direcv pg1bbvr*z 7(tion of 37.0e above the horizontal. If the mass of the 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 supported by two ropes as shown ick(g75(el i1 gs7pbk bn Fig. 4-2. What are the tenskc(51 77e pgli(bkbgsions 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 ropes are 50 N, what is the mas kpv g acdp6:sm 0y+oxy+jg7;,s of the traffic li mgk,76 gx+oa:0 cy;dvsyj+p pght?


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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 wihs ca -*qm5n te:u l)bdm .; q67bvzny(bvn93zth each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the morq e;n:).35d- 9s b mvz *6utn7hnmylbq(bvacze 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 ar z295d;ef.ttat(xl dr.p r p0zy0xb*r e in contact with each other on a frictionless surface. t;zr x*9zpr(e. p50y a trxd 02lbd.ft(See 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 connected by a rope. (See F0l 6. 2gnh hm,sep)oodqii a*-.uk3ywig. 4-4.) If the forward force on the more massive box is F, what is the tension in the connecting kehp 6o)dui, m.is oyn*qa-g3 2l.wh0rope?


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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. (Sresv1j z lu6+.e5ir6zee Fig. 4-4.) If the forward force on the more massive box is F, what is the acceleration of the lv5esei .6rjr6z u 1l+zess 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 z (ze tj vgf 88+;7uq0hhfll,iin Fig. 4-5. Box I+ g efi8 jl hl(0zq87vth;ufz, of mass
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 static and kinetic f*bml m,jgu qy*t 50,cfrictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. Wh05mbtg*l,*y , qcjmu fat is the net force on the box 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 frictions xbhg; b7x6k l(for plastic on wood are 0.50 and 0.40,b6bh (x7 kxg;l
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 direction. It slows and comes to8*ia7oz q0p thdm k;v3 a stop with a constant acceleration of703vqd k;zh*oim pa8 t -$2.45 \; m/s^2$. 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 on a horizontal surface icv d tj-ft/i-u 4jno13s pulled by a 5.0-N force. A 3.0-N friction forn -tud4ij/oj1tcvf 3-ce 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 4.0-kg mass, 7 0pnqx d7x3 ;sk0xoqgfrom 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 puck is given an initial speed of 10 m/s. It l3 i/, .q p6mjzexye/zslides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and txz/zpe6 m .,q l3/jyiehe 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, police find sx 9t, deg;2m 0xxnb(bskid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the r sb,t(dbe 2x;xngmx09oadway 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.) u5 5iqyjw(w t(s*pdq 8 The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does no(5 (s* wi5q8upy dtwqjt 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. 4-6.) The surface betweenmdgi:krt(z) 5i+ ;u /f3 tipsp the more massive box and the horizontal surface is smi if+/m)r;k 53pgpt:t(ids zuooth and the surface between the boxes is rough. If the less massive 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 incliner;kbvqzy t2,2f/whmgs 0df58 d plane. The plane is inclined at an angle o8z h2 gq m2b,f0kf5syd; wtrv/f $30^{\circ}$ 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 tlu517vx,a ltihat 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 inclined plm cj2ggl. b+3csre2ten0pz8c2-b b0 bane 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 inclined plane tilted a;jyq3d u83uw mt 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 directly down an inclined plane, at a consxhrmsu2*y gvg .rg)uz42. b ,f.asz)z tant velocity of 6.0 m/s.z.hrv.g) guamyb zu),4 rxgsf . 2*sz2
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 m slides down a rouwopx;7u 9 kjbp .m6zdzzq (;g(gh $37^{\circ}$ 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 bk-)ly :-i.gqond, g jqz;y,k;+ fc g,hemt/j m slides down 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 rough surface. The caku06 mqfvln15ble attached to them0k q615luvnf log makes an angle 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 tilc 72 l0y14 ngey5p(,jzskmi ktted at an angle 7p i,t2me0j (gc1k ykl4nysz5 of $33.5^{\circ}$ 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 plane. The angle of incline is gradually incjy 1n4x p g je: 318enfmmr1lmbjck-(1reased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction be-1 3fn lnmrjxm11 jp k:m8be(ecy4j1gtween the object and the plane?

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