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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 whyn.igqa ej ;5j) pemj;+ 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 5)vx3s1ysr) mafkr9.u8p b nz xkj5u6, the resultant force 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 will m s) (:*yxy*z;bb4eb*xsnau8dxh+nq

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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 tur(*fiu1)7vo5 . i qqcvyshdmv 8ned off, while traveling in empty space, the starship wi1.8v *)q qs( dhcomyvvufi57ill

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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 s4k2rq(qw y 9artraight line with constant speed. It is far from the(qary9k2 r4w q 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 bus2kbt( 9jr0.;fls;p gvlcwbi 2 , facing forward, and you suddenly fall forward. You can imply from this that the bus'slb(;pc i b02tgsf9r; j lvwk.2

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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 suddenly fall forward/ zx nh4m8 *7gjrfb(mch 5v*nf as the bus comes to an immediate stor**h(v/fnn m8fg7 bzh jm4x5cp. What force caused you to fall 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+86 xh kn5 piiqpfb(c5 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 is inversely eq o9u.e xys +ns,ok32;yrdz5 tgkj)/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 a-9uifgmfp i;mxns -6xcz2o1 9cceleration a. If the same net force is applied to mass 2m, th9ximfxzogi9s-fcu -2p6m 1; nen 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 m and produces abjq35gg d7+ ldn acceleration a. What acceleration results if a net fo3 b57+lj dgqgdrce 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 balloon, and then release it, the balloon will fly away. Thi em4g by(. jztecwh4 j74z.lx1s is an illustration m lh.1g( xtz4yje.w cbe4j47z 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-ot.mlgder6hna 0z s99 :n. At every moment during the collision, the magnitude of the force the fitsnmz:09e rd96.h lagrst car exerts on the 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 the object exerts on you 63 *ub o9ft4ztas/z pxwilf3xz tpas9 *ztu ob64/l

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Action-reaction forcef u1sas6rmh ;)j ,i+0hi;fez js

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Action-reaction forces argab7 i1 y+.x)5hn wwzwe

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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 causes a lot of damage to the)b.x8henrd/4z ffc : x car. Since a lot8 bx)n dxehff.c4:/ rz 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. ccbk242x: k 6pob9o ha The Earth pulls on this object with force mg, which we will call the action force. 2:c2 xk b4a69bpockhoWhat 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 fros0p3gxm ,nch rq 1l */afu20nf1flf)mm the ceiling by means of a string. The Earth pullsfmnpl r3 n1lu* 0qsf)f 2gmac1fh,/0x 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 pitched to you with a 1500-Nh6)paabwt0* guh:lq3zy 3 6pf instantaneous force. The ball hits the bat with an instantaneous force, whos0y*pt:hb6w3hqf) u 6l pag3az e 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 lawsl,++eejv (8c) hazvksft6nctx 6: 8en.
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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 gr a(p a-ph) qq*ox7chh e4+8lrravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Eahchqpe+8 (hrq7 xp 4o )*-raalrth?

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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 distance isdlfzx;aw- wi8p- ,x4p

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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 bnh,u:.5 k7sg./zu y.gwe rdkuhx;1w to mass ratio, a person weighing 400 N or a person weigu5:7.s/wk uwd. g;hury hbg 1enzk x.,hing 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 pupcwgas t gr,c,4iqyi2 : h+ xo1*nk2.ath, the net force acting on itg*1u hioc wipt.nc 2yxs4g,+,2raq:k 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 dropa ta8 vht2*5+uy t6iokped simultaneously from the same height. Ignore air resistance. Compare thek2it6t5va+htou a 8 y*ir 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 their respective terminal velocidf/)2u 2sflxga5 6 tp:joe p/bties. Which object experien:txsd6lu 2e5fp bg po)2fj//aces 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 string from the ceiling of an elevator. j9 .4jd gwlc3vThe elevator is moving up at constant speed. What is the tension iv9d43w.ljjc gn 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 the ceiling of an eh msz:egdz2i9l 4*kv6levator. The eled izm:4lv * gz9k2ehs6vator is moving upward, 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-jr,yim, ac)kbi c3/ r 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 carqy8*2 teth:e3qn (eoj ton from rest than it is to keep pushing it with coyne:o8eq23t(tjhe*q nstant 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 accel,8vh z2 5jgzlierates a box from rest across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the hv5 jl8g,zi2z 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 inclined ramp at constant velrsvnyfg448 n( ocity. Thus we can dey8nfv4n4s ( grduce that

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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 downzh/w cn-74 keutc:aj1 a frictionless plane inclined at an angle q with the horia-:7h /wc c4j1n tkuzezontal. The normal reaction force exerted 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 frictionless plane i 7 q0r/n(zgrbynclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is directed (rq/ yzn0b7gr

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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 frictionl 1sctuq9cp,xe :sypc9dv b, /j4z y73hess plane inclined at an angle q with the horizontal. The gravitational fo3 ub,pd9 sc,tvq9 pscjh7ezxc1 /:4yyrce is directed

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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 relulxkamct 8z7-wd y() ;eased simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their acceleration akyx;)u(za-mc wl 8d t7fter 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 the izn* s zi*np qw0);nk;hx)ex+object, and it accelxne*pwxskh;nz q ) ;0in)i*+ zerates 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. W2bznr esepl07 ;5e m(m:; rhevhat is the avvm75np:e0eeb z;mrsl;he2 (r erage 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 reaches a speed of 8.0 m/j5 gyq7/lb purd;3kc. zk ;j8ds in 2.0 s. What is the net force acting on t;bj dlryd /.k8 pu3jk5q 7c;gzhe 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 rocr*s)fp em:m4 s9ng et.ket which acquires a speed of 50.0 m/s after tr t *esfg 4npm).9:esmraveling
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 10-kg mass f4mm80rn 7c zy z.wi*mcrom rer8zz iwy7nmmc04* mc.st,

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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 -qov(i wu set-0j*edu x8/mc0 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 of t6:vwf;axl39jq e qiyg ;8z.u the Earth where the ax gv9fj;i3;l:z6.a wtqyequ8cceleration 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 ma3qrhtbgm,;1 0yg2z ko *qqc6pss of the object on the surface of the Moon where the accelrh,qc kp6q0 g;mgob1z3*yq2teration due to gravity 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 Moon's62 ga)1 hzvsyj gravaz 1sj6)2yhgv ity is one sixth of Earth'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-ofc gktt);8t -gy+rb.jp -war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelerates toward t) .-;grykp tgj b+t8cSue 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 lkrw.h3 /tyfq 2evel frictionless surface. A force F acts on the stack, and it acce3hy/w 2.rtk fqlerates 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 scb 84p6 qirode0f,+wulale in an elevator. What will the scale brwp40 6+ufd,iebl8oq e reading when the elevator 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. Ifxt5ly*zhbk((ng 7k/b,m e3 g p the mass of the person is 60.0 kg and the elevatobm(b7 ntk3lyge*zh5p / ,xg(kr 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*jb:f eliflo 4, ek)dlpfn. b; ;.mr7r in an elevator. If the mass of the person is 60.0 kg and the lflldmb*fejn 7.)r k;:;eio,r4fpb .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 act on a 5.0-kg mass. One forc ;u fqf -*(opn+ql7tore has a magnitude of 8.0 N and is directed due north.+;*t l(nu-qpor 7foq f The second force toward the east has a magnitude of 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 held in p1xq0 gf oxmc4sy0*h t2lace 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 stoppx21y0tc q xfh*g40 smoing 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 of a truck. It zlztyv2mf ae0l :0 2x2is held in place by metal brackets that can exert a maximum horizontal force of 9 :zz2xmfy2evl2 00lta000 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 m joqx-0ht0/mudb,8v8 4b fy yh= 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore t/f8h m q b 8-dj0hbyu,0yo4xvfriction 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 M = 0.60 kg and m = 0.40 kg, what k6/r v ai6txp.is the tension in the string? (Ignorv/p6ix6a k .rte 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 smoothkp(xt;q+m zi hd;vj -2 horizontal floor with a force of 100 N in a direction o+i 2k;d-;m vjqzxp(thf $37^{\circ}$ 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 o8 ,vn4xs0 n9sr+yoyk ff books on a smooth horizontal floor with a force of 100 N in a direction 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 toky94r+8y s,fnx n0svhe 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 s srp:g1 plw.)yu/0ax dhown in Fig. 4-2. Wh/1awy. ur:dsxp0) pgl at 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 ropes are 50 N, whc-rw7m5sz fwe is53+ ghx4q- cn pkwh(j v387lat is the mass of the traffic lighrjlmkw ghpzc53+3n7-ehiwc x w7 4 85sqf-(svt?


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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 eq aj 1w la ny9f.kw((t0za.;dvach other on a frictionless surface.k1;wq 0a yaa.tzfnwld j.9((v (See Fig. 4-3.) What is the acceleration 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 r10/aot; x7q( ytztfb on a frictionless surface. (See Fig. 4-3.) Whax(a7z r t;obyqf0 /1ttt 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 2m4dtbh4z r5 pic;bn3gu, 5.a:mrj p lg3 are connected by a rope. (See Fig. 4-4.) If the forward forcelacjd5rm uph53ti:n4,4 .gzb pbg; r3 on the more massive box is F, what is the tension in the 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 b wh ztsc8n7xq3y95 fh:y a rope. (See Fig. 4-4.) If the forward force on the more massive box is F, what is the accenfh8q7 3:tsxcz9yh w5leration 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. 4-g ) oxlmteaonprz(z;79w( 8 b85. Box I ((woa78xblgzz8et;n)9 po r mof 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 a8meo.v 7 gdxc7yy3j)bnd 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 ox7b 8j.7c yyv3d ge)mwhen 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 fo.tm8ua7 vbvq/sh in 0p37)rv pg)tqi+r plastic on wood are 0.50 and 0.4 7i7 vavq+pupr0gh3mbs./) t8nqit) v 0,
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. Itv okr( ,kp ow/(23+1k supwnmq slows and comes to a stop with a conw+n(p/r,qwo 1mskp3 k u (2vkostant 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 on a horizontal 4o5/k*kbn u ml sld7*ssurface is pulled by a 5.0-N force. A 3.0-N friction fo/7 u 4d*5lsn okslm*bkrce 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, from rest, at a rate x,l6.l xwtq c,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 1 k(/(5grgz d/a s00vzlsatm( e0 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the sdk/tv eg( l 0(gzz m0/(a5arsice?

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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 ac:5 7;fkho ydhacident, police find skid marks 90.0 m long. They determine the coefficienk7y; doa:f 5hht 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 su hf0v+: ff*w ,aapm/4eu z*moprface between the more massive box and the horizontal surface is smooth and the surface between the boxes ,v0ffe:+omp/ aphu4 m*z f a*wis 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. 4-6.) The surfus+8-3x vaegt1t hol:i-s+hlace 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 not slide on sxa +lv hs-3 hou1g+i8-e :lttthe 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 inc. pla4k rl2x 1a:yct/ulined at an anglkx/plc4ty rl.au2: 1ae of $30^{\circ}$ 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 xiyrpth:-8 q21vkubd75vq q- that 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 plane with an458 mpe tr:wdy yh/jpyqd8:s9 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 tilteopt)vsd+ 0f/ -phx:xcibl0z 6d 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 directly down an inclinedro/4 gur z.k2y plane, at a constant velocity of 6.0 m/s. r rgu/zoy42k.
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 slide*-in9t: 5pr3q ywbxsus 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 down a roug 2)+cjdovvp jj5.v1hvmn9bn+h $37^{\circ}$ 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 ;bojl.3 1rgdrcable attached to the log;3dglo rr .bj1 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 w4 vmn+myjvdx,:4 o:i inclined plane tilted at an angle of :4iyxjom w+:4dnvmv, $33.5^{\circ}$ 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 plan aagdm1fk7ej(nktt e-c/ 57a 2ey97yj n.g (hfe. The angle of incline is gradually increased until the object begins to slide. The anglekdak7ya5eg f(t9.a/eyfg1ht je2 n-7jn c7( m at which this occurs is q. What is the coefficient of static friction between the object and the plane?

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