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习题练习：Physics Unit6: Work and Energy
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 作者: admin  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月26日 13:45  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  
  What is the correct unit of work expressed in SI u,mm;+.vi5d z;bf f u w*fx,jjoo0,egrnits?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a s1dq7 awgs x/ld5 j4uj;ystem if there is no motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard against a stationary brick wall, the am:x)e1 pxb)vd4c nrp+b ount of work you)nvepd :b+c )rx4x1pb do

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was liftet69g.y j1sv9,bprhuxvqxtp /y- k7 n9d 2.0 m vertically and is being held there. How much work is being -9p7 /jq9ynxk1 vpty vtbh.s x ugr9,6done in holding the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constanty- ms vol)i-/r kk2o/x velocity carrying a 10-N object, t2i v/k/o-)rlx m-skoyhe amount of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then returned to its x*ovxq as mihkl q4ew2xp49nf4/7:6noriginal position. If the total weight is 30 N, h6i h a/7xqn:knlx2e4*9v4sm p4 of wxqow much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting on an object do wzuli-v6b.0 1 an ,crzdork on the object?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the work done by gra )bgih-go9b -z-/dtr yvity while the ball dh-z )gbo 9git y-/r-bgoes up with the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the clrsp v v dpen4nl(d 3bv(3)vz: h0.9ueurve, on a Force versus position (F vs. x) graph, representsr :nve d3u9h (.(blzvld np3 vveps04)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus position (F vs. x), what represents theyao0 *0yt 56iro k8gbriwmwg *3 b);in work done by the fr;* okyb6n 3)ywgo igwtb8mir05a0i*orce F?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is positive, then the object's kinetic enedharw:3 3 dmuj:vn7 e1rgy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negative, then the object's kxfq*xj*w:dh4p3(ug-j:b -z y 9 fbt zuinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is zero, then tbg :b2gq)jf b4y; qp6lhe object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is moving jltf:j25c(c h at twice the speed of the car. Which statement is true about the truck's kinet2tc(lhfc:j j5 ic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car Jy 6a 2eul ii7;tgcfh1v/z5td9 has half the mass of car K. The kinetic energy of car J, az19cild2giytt; v65f ue h7 /compared to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its origia74y+grcb pfo830 c nczhec49nal speed. What is the ratio of the final kinetic e8n0frca 7ecyog c44z cb+93phnergy to the initial kinetic energy?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s and a pebble is moving at a speed or j1 xsffy0:j: fi.x1t xyto730h 6nzif 5 m/s. If both objects have the same kinetity y 3jf0t0 :ix roxf.jxf:z11 7nhi6sc energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed 2.0 m/s. + qy4;ajv z t65x-qoy*q2o ney A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater za2 yqn4e6 yot vqjx-* yq+o;5distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of ymb; 6oysk 6gb8our car in a panic, and skid a certain distance on a straight, level road. If you had been travelibs86g bmky6 ;ong twice as fast, what distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass or h bqi4*c;ck0hk2t+urbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to uhih4 r;kctqk2+ cb*0the planet's kinetic energy?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy href8 7x28+eiarj, oj principle.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a systr.otyonlw820 em to have negative potential energy?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a height h above the ground. A sejh:pfa b 8mu3/k np( nkh-n(q/cond object with four times the mass of the first if released from the same height. The potential energy of the second object comparedh/u(nnqnk: 8a (p/k 3m-pbjhf to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to theu:-bz *4d9+ g iewev(ohvhke- end of a spring causes it to stretch 5.0 cm. If another 0.ve - -u+ie(4hkdb oe:h9wvg *z200-kg mass is added to the spring, the potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy 3swnu-ir/ f o.6anen7of a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy K, to itso6 encikr8a8 0 potential enern i880 crk6oaegy U.

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy ipx y; n,gt2t0/jb hg7of a car driving up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy object are sliding witae v23qlhw3 a,h equal speeds along a level frictionless,2v3ala w e3qh surface. They both slide up the same frictionless hill. Which rises to a greater height?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses y-zxps5v8/8nf gngq09s h2io w7.g sb$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

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33#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the principle of conservatiog8 z-mv 9e.jtur3anwryrhy,3fp53 7nd,b h 0gn of mechanical energy for conservative forcesg b3y8-3.pr,eudw05thnyf3vag9 r7 zm hn,rj .
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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball falls from the top of a building, tht6t4 ls:a9 w;g(vu 1/ibvztqb*rlqss-g zl59rough the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to 9l iv-5s(lw uz*tqt/;t:rbzggl6 s 4sv ab9q 1the potential energy (U) at the top of the building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and gain9/z k0y+zc(nh:3cpnsjgsm 75lzi1y ss 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy dih(g lzcci9y1 my3 07j spsn:5ns/zz +kd the ball lose?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance /m2boxwoif .; .z3n g (hdiq9sand loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball ghqob .gw2;f/ mzx9.(sio3ni dain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation of energy/,bab.k,x cr f.
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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t isy// v1cdsa zvl /v0e4i

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of power expressed in SI units?w dp -7ko0 ij.t0-uiuj

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unitjdt*l,d4nje38d(3 3ubmm c; zmhpl ;n of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times the work in one-third the ti3l q+.f2dn+f nb5bqb cqx7ll2 me. To do so, your power outpux3b57nb.q22 nq f ll+dcfbql+t must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, thezvuj0 z8x;g0 dq-i4qs car's engine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically 2.0 m and held (x,k ;mopfk q4jjhzyj(2.3 rgthere. If the object weighs 90 N, how much work was done izm, kxy;fkp4(o j3(.j rhj2q gn lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distance of 1.0 m, at a,w c5::uuocc p constant velocity of 0.50 m/s. Whcc pu,:c 5:uowat is the work done by the weight of the book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a colb.lix am /oe,dw342 aq.;kej nstant force of 5500 N for a distance of 50.0 m. What is the work done jqw aabmk/ 3,e.d42l.x oi;le by the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 s2/xhyl4wk:dbtn 0y( N for a distance of 50.l kd/: nwt 420byhysx(0 m. What is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is vx,ca/ rb,ol)pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on th,,o a) /vcbxrle elevator?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6.0 m up along a;xgry7.-nqu r5ee.mow+g-ir,c1 m g6yn hj+n $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slideer;k8 nv7o6crs 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sisterb 7bs e1m8ssocs n,jt1,z ov fw)p0)0t Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an anstf) me , sc78 bop0vosn0zj1,tb1w)sgle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in thwrqr2w: 7ba- r8 giat+ e4.rcte direction of the force. The graph in Fig. 6-1 shows the rbe:w48+.t - raraig7cr2qtwforce versus the object's position. Find the work done when the object moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in :ywy(fh qo1r7 -q ;dpgFig. 6-1 shows the(fyqdr; p:7 yh1qgw-o force versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. ion-pwu2p ;;fa a6xh *6-1 shows the force iw p2xp*-;h oa6u fa;nversus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The a,eyoo: --j2,hwe1m mrror h1graph in Fig. 6-1 shows the force versus the object's position. Find the work don2 :a h1mjr,,w--r1eo meo hyore when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (initial9;qhbhna2y2 uly at rest) across a 10 m level surface. What is t9h hqu;2nab 2yhe final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (initially ats0 0v 5h9n;zqd.oued2vpjjd ) rest) across a 10 m level surface. What is the final speed of the j9.)sevvdo judd;5n0 hz2q0pcart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How much )i t/a5s nii:6m9kx kvwork is required to sti )m x kiav5i96t/n:ksop the mass?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initially,+.c8b lff7 h8d bwwnx moving at 25 m/s, what distance is requil8dbfb7wh c. f+wx n,8red to stop a car moving at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart wsc ww;joo) um8ttks:70*4ve . It is cocked by exerting a force of 20 N over a dista 0*;mcewk7w8jws:4) t svotounce of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal component of 80 N and a vpb8b1 r8bit3oti -qo+ertical component of 60 N. The force is applied tooir8 3+8-tbbqi1otbp a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizontally in fb up4)achk p-)m-l,qto a bale of hay, striking the hay with a veloc)hl- b)-paqufpc,m 4kity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above sv+:- oe* katea floor to a height of 13.0 kvt*o-eea +s:m above the floor. What is the change in gravitational potential energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined planv vzp:uxwb01p1* fi dqv6fd6s)vw2n .e. The plane is 4.0 m long and rises 2.0 m. If the plane is.6 ffivd*1buz:vv vqspwd 61pwx0 n )2 frictionless, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the sprd i+ rr(;.uu ddj08t* iuu, )bvtqkp-ring to stretch 2.0 cm. What is the spring coquud).kvrdtdir,i;j( u t b 0p*8- +urnstant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring constant of 60 N/m. How much potentiarb sz1 ekybj94kn9 :eo() f,uql energy doore uyb )1 f:k,9zn4 k(9sejbqes it store, when stretched by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompress4o.xeksvi 6;kzb)f0w ed spring with a spring const4wb fz;6kkvo is0x .)eant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to s0: y ymqzn6*;p pe0afrtretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched p;e a p6mnf 00pqr*yzy:osition is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initially compressyn wnl9i2o,z:m+jm3 8: kw u1y,cqu-lmqx6amed by 3.0 cm. How much work i m8:mumx :,ynl+ w luoq9wczk26,ji-3nqm1yas required to compress the spring an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest fewhm,)qkr:wc)6n l p. +uo ldl1d2*qyrom the top of a 50-m high slope. What is the speed of the slier on reaching the bottomnc 6pdly1ml*r:)h.wqu 2qkw , odel+) of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a hill with an initial l1(ml2ii7lat speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m inl alitm7 1l2i( elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plane. At the bottj6x;f s a2y4 rwno.0r 2:qkfmiom, it has a speed of 9.80 m/s. What is a2mi6n ;q0wj r xs r.fo:2kf4ythe vertical height of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor,0qs hhi :ev9 supe6;/h v) *j.qzgkz:y its potential energy exactly equals its kinetic enervq6sz90u:gj/eh* yh:. ;eiz)ks h pq vgy. How fast is it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight up from ground level with a kina mu;n*psaa;y.f4( tn etic energy of 40 J. At the exact top ofp;ny* a( a n.amtsf;4u its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a knuvjd6(l8rl6 inetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what v v (jllu6rn86dertical height, relative to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts fror/pzhdbo dyt875:9t cvdh37 a m rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the sper dhvbd /p:o759t3zyd7 a htc8ed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/te1;yi6 x8z)- )vh, oienqtsq s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of thets8q-qx ;h)tz, 1voie)yen6 i next slope, which is 30 m above the bottom of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bottom of a dip with a z b5g5p/(w ukrspeed of 25 m/s (See Figk5u grbz5 p/w(. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bnxbtk,2u+tb 2e y1w 2e)ke.e bottom of its swing (point

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away fr2;xall6o.t /a8k kxvj om the vertical axis and released from rest. What will be its speed at the bottom of its swin 2l ;6/jla.oktkx xv8ag?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal spr:jbg)bul 6e.n ing with spring constant )ljbbue:. n6 gof $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows dg0 l+az+w8kb lqfu)(z own her 2000 kg car to stop for a red light. What work is done by the friction force against the qlfb+uz+k(a wl8z0 g )wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg object and a 9pc/ )lohkkltrx;l x2w+wa76horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will ikol7x+) ;wh 2w kallp9t6r/c xt slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, level surface. It has 24 Jrrg7 bq r oks(90f0hc-ad9y-d of kinetic energy. The friction force of9-koqyr ad bd-9(0 hr7 c0srgn it is a constant 0.50 N. How far will it slide?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N is applied horizontally to a 2.0-kg massi:mjj og0s)z - on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change gosjm-zj0 ):iin its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slope.wgfeg0q2z5 r8 p i6ih- If the work done by friction is zqi8w2fg6 5-er0 ihpg $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inclined pla*p2ne dmd3k v,b5 wm-v5iykn) ne. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J o ,2)w 5 i*vmdnpk ydn-k35vmebf work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is relea6jbq .7gj l-nljfb2b*sed from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between thl *b26bj7. gj-n lqfbje mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a he7*no)cy+cr :.o*gp8 i9nv1xobkz8 u xdrc h3fight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on itr7rn * 8 zfi1xxnobu 8v3hdy.koc)c+ g *oc:p9 as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energy when he runs up a flight k,o6nrcrh 7(r9w7yh 8uvqm +rof stairs 10.0-m high, iy qrrh7( +o,u69kc7wnm8rrhv n
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with zme8 h5m1h k8qsux8x:8 4hpaya constant velocity of 5.0 m/s. What power must hz hxaem8qpmy884 hu1x58s:kbe delivered to the object by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are used by a 1.0 hp motor that w-92czry fi2zh+t 1ci nip5v.runs for 1.0 hr? (1 hp =+2 1vwizic .2phtfzny c95-ri 746 W)

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cyclist does work at the rate of 500 W while riding. How much force does her1hryd p-u3olo9w bk .rj2h ;oi,x8m0r foot push with when she is travelinixl.u8kphhjd9y mro2wo0brr- 1 ,o3 ;g at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car acceleratesf grk11t m;wz0ab9 w 4:qdflf7 from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 7b dfq0fz9:r g akf7; mt4w1l1w46 W)

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