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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 unitz* f)xy.vlmnc-y43jms?

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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 system if there is )2 89zozyhu+jj d )sbnno 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 statiir6 /cn;c w-,q 2ygdlmjsu;.conary brick wall, the amount of work you glsiq rd;uy.6,mcn-j w;c2c /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 lifted 2.0 m vertically af9*xhphd8r+7j x9y kjnd is being held there. How much work 9x x kf8ypd+ rjh9*hj7is being done 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 f:a bztcn9m0z34 1i*ti+n s wdcorward at a constant velocity carrying a 10-N object, the am0z3c 94ds+tbci nz:iwanm* t1ount 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 original p9oua8ea qnh::fb1 lr)osition. If the total weight is 3e89au)1f lhb:oqra n :0 N, how 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 wor5zw5 p ,4a ff2z pq4ze5 xoezooms2g,/k 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 donerrg vjm.13yyoz y5q+( by gravity while the yy3+z jg 5rrvm1o(y.qball goes 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 curve, on a Force versus position (F vs. x) grapwl/kj8q56 5ciwv8fyq y 2tskp4a)s. r h, represents6r8a f5kqw4q ) yys82tjlc svi.5/p wk

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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 r1xvrf;m . )+sbyzi tsjxy89,g epresents the work done by the force ;1 8rt)sy9zvsigm+ x b,x.yjf 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, t- qk2qanxb ,4then the object's kinetic energy

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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, the4i-f-ko 0l)pd *a wrmfn the object's kinetic 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 the object's kinetic enen naldeh88y5gx n8 bh hq6u16 or::i/ergy

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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 at twice the se+r5guf *z -qlpeed of the car. Which statement is true about the truck's kinetic energyu *z-5fl+erg q 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 tid/mw 0l:wm j w,a9p;car K, and car J has half the mass of car K. The kinetic energy of car Jm /iwjtlm9d; w, :w0pa, 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 hc0n4atfs+w9 ealf of its original speed. What is the ratio of the final kinetic energy to aets9 nw4c+f0the 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 dnp7 o 1+(dd1tr*un vois moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the ror* v7d po1 do1d(t+nnuck'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. A 1.0 5h.vqh bqrd(bn a+(k 5et)j7u.zi k(w-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, t5 hw)h.auzqb(b r.k ei 5jn(+q(kv7dand are brought to rest. Which object travels the greater distance 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 your car in a panic, and skid a certom. 2 :gsunw5rain distance on a straight, level road. If you had been traveling twice as fast, what distance wsmr .gon52 :wuould 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 orbits the Sun in an ellipp crtku1 n ;lhn*-c23wtical orbit. Neglecting any friction effects, what happens to the planet's wrk32nuh;* lncp1 - ctkinetic 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 prin lr 1- hejhisu,t-68bfciple.
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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 system to - n1m,ype9z ze.wio0jhave 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 release9momz4 cnal: mwu2 *g9ok 6ze4d from rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The z:nu9k4 *o42g owc9l aem mm6zpotential energy of the second object compared 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 the end of a spring causes it to sm; i/5 ubis.zj75bd igtretch 5.0 cm. If another 0.200-kg ma;iz u 57b bds5ig/ij.mss 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 g(j jr7zk ib7yv7h. 2zenergy of 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 enerahy0y +fz hru+jcqt,c)f :; 5rgy K, to its potential energy Uyqcyf;ra: u+htzh+ j ,f c05)r.

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of a ca0*eknqk+;37ml 2u4aabwp u otxx6a4gr 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 with g,fc+f-v b ft1 k19zzoequal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which ri cg+z1k9 ob,1-vzt fffses 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 vv ;b7pt893vt0phqjs$m_{1}$ 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 conservation of mechanical energy for con i f3ro03n*fq6a:wk fphu0*/c r djh8dservative forces0 / i3fjq*cp6f3n8hfr:hr*0 odwd aku.
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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, through the air (air friction is pv pd1qc5;rs+ tresent), to the ground below. How does the kineticd51t cp q;r+sv energy (K) just before striking the ground compare to the 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 gains 3-(a5quiyt)l(iux3 t o0 J of kinetic energy. Do not ignore air ry otxt-()3 ai5ql u(iuesistance. How much gravitational potential energy did 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 x1-d ax *zujdwpn+t(p;0 m5 scvp0e/ land loses 30 J of gravitational potential energy. Do not ignore air resis*t;wv5sm z1+cxpnp l0-j(uea x dp0d/tance. How much kinetic energy did the ball gain?

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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 4s o0u.l.yd kf+royy4energy.
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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 isxezwt: )/we p ea,)j8d

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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 icpx(0v/y+cbx-azu)q 1 bvp )bn SI units?

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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 afhy8 -y39pk eli:pcb* luyh0, lc, ;xq unit 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/dzoi aw ad( *qnid31+ time. To do so, your power output must have w*+noz(3ddi1 aiqd/a 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 f wf1hpn.km72k ;(s jkn5 njb25yu/nyconstant acceleration, the 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 there. If the object weighs+j 4yxb6 pycxstcxj8v oi 9qn0k wky:1 5;/-oz 90 N, how much work was done in liftin9 /1xxqy z:n4 ;bwop xt5k6j jycy+c- 08skiovg 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 m9mi).atwkvz y:7 c; oegv6p +n2daz2 n, at a constant velocity of 0.50 m/s. What is the work done by the weight c:2 vak )69p 7nmdozw2eg.zt;vn+a iy 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 consta5ssu s +q2x*went force of 5500 N for a distance of 50.0 m. Wha * 5uses+sxqw2t is the work done 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 const6i-/scpe:p s cant force of 5500 N for a distance of pc-se c/i6 ps:50.0 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 pulled upward with a constant force of 5500 N fowlsk;gc9d2+: ke rl:jhkl (.pr a distance ojl.pg9 wdl+ e kk2 r;hl:cs(:kf 50.0 m. What is the net work done on the 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 pulledngr9l w*xov7wjf 8p*6 6.0 m up along a $37^{\circ}$ 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 slides 8.0 m dowlk qs 40/0x7tfyosk7c:n6i qzn 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 sister Sarah in a sled on an icy surface (assume z poj*h 3kgqobs+),ag +fxa:ep.z(i 1no friction), with a force gi(o3+g*zzq o aeb kp x :h)+,sj1f.paof 60.0 N at an angle 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 the direction of the f2g xt6hmm q.)oorce. The graph in Fig. 6-1 shows the force versus the object's position. Find thho.xg)6 mqmt2e 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 direc+ifg b s-df8al5i:z *ktion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves frkbs f: 8ai+d-z g5f*ilom 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.zpow(2 h+uh cxg 22-xrdlceo p4) dc5- 6-1 shows the force versus pdxzr )p2l+e(-xou4 g 2wc5hdcch-2o 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 dir jp0yrwi;7y 7k)4hctxe: aj:wection of the force. The graph in Fig. 6-1 shows the force versus the objectxirpy4hjec w tk;0yj7:a 7: )w's position. Find the work done 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 applin r,7yalj:q*lajcfq sg8 :u59ed to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the cjfa5nq9l* q, :a8uc:gsjr7y lart?

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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 appliefdtzi -.e/qj; uz6hq ;d to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the;d6ze- ;./fi jtq zquh final speed of the cart?

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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 1 /gwny dfp78oof 5.0 m/s. How much work is required to stop 71f/ wn8opgyd 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 moving at 25 m/s, what distance is rectk:j6.w mbk2 b3 .ugkquired to : w63tbub .cjm.kkgk2stop 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 atipo 43v 0 *n5q qucumvr6.au6 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 c5ram cqoiuuuv6 *q 60tvp. 34nm. 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 vgz.8hqn 5h2e8f; lz cvertical component of 60 N. The force is applied to hvzg8q.c 8 efn;5zh2l 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 )88b v,)rih2:v mrphwbll:6mgpwx . qis shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stoppmqb2vp.r r:hg iwhl6,:))b8x8 pwvl ming 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 heigwsvr9 sci 7 ntv44i-dowze; +8ht of 7.00 m above a floor to a height of 13.0 m abos4n;w8v9irci4 ews - oz +td7vve 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 plane.*7.4-hsywz eeow m bpd;7 7hmv The plane is 4.0 m long and rises 2.0 m. y wz;7ephsw7o7 bvm me d-*4.hIf the plane is 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 sl),f92 xpht/vmjckgn,vq t4 * pring, causes the spring to stretch 2.0 cm. What is then k,/ m* cxvlqgf p2)v4tt9j,h spring constant?

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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 consta 9nsku-v:)p 8oqv.nm knt of 60 N/m. How much potential energy does it store, when stretched)8mk:sqno k- n.9 vvup 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 uncompr,zxmi nr/-l +yessed spring with a spring constant ormi-/yxln ,+z f 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 stre/6 re*q/ j urd*a4dhsjtch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is /re sdjjr6q/ **d ha4uat 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 compressed by 3r*p:c+m fz bhhpyop3j2b 3z83.0 cm. How much work is requihr f+byhb 3 3cp3:mzp*jo82p zred 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 from the top of a 50-iin :xo+u,h /cm high slope. What is the speed of the skier on :xh+i/oi,ncu reaching the bottom 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, pu. byavew x:kf23g rmwtb16+ao5yo;b- shes off the top of a hill with an initial speed of 4.0 m/s. Neglect5 k.a6e+m2ybtvby f ;r-g ax wo13obw:ing friction, how fast will she be moving after dropping 10 m in 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 0do 6ldjkka kq 2 /q-cw:iao3) h15otebottom, it has a speed of 9.80 m/sa :dal5kok q2tdeo1c0-qj)/ ik36how . What is the 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, its ea g.j i:zq7i1potential energy exactly equals its kinetic energy. How fast is it movgeaj: zi1iq7 .ing?

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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 *3yhac/lc 1rh with a kinetic energy of3y*h /cla rch1 40 J. At the exact top of 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 gro s;q) rpmxk+t;und with a kinetic energy of 220 J. At the highest point in its tr;+xs k;t)qprm ajectory, its kinetic energy is 120 J. To what vertical 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 from rest at a point 45 m above the bottom of a dip (Se30oyxfflc/;j:;d/nc*c d5y crz8 paee Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, whicha8j eyl; rcf/ cf;c/5 0dxycodnp3 :*z 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 w9bb enq - dd+j95kq sl73qubw.ith a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of t9+bjb5 3d ske.d9n u-qqwbq 7lhe roller coaster at the top of the 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 w,l i-3mjm-c0x- (d+gg hih tcsith a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the hjm ,3+t0s ccgldx-h -igi(-mnext 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 bottom of it px 30*chei 9ri)wtt3rs 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 2-kg pendulum of length 50 cm is pulled 0.18 m away from the vertgsc*udaho )y0l2b mdo4b,t :5ical axis and released from rest. What will be its speed at the bobhl,sd *4m0 c2db)5: uoya tgottom of its swing?

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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 initiallybqf7v8ik l,- i uncompressed horizontal spring with spring consta lv,fq ibi-87knt of $2.0 \times 10^6 \; N/m$. 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 down her 2000 kg car to stop for a 3yzda j kiv jruda9f+*-jt011 red lightj9k*avj+3zy0f1rijut-d1 da . What work is done by the friction force against the 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 horizoqhfc,tv2 s3 e,r rm3)yntal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming t fe, h crty,qr3)vsm23o 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 J of kid-5u z6njx +lsnetic energy. The zdn6x u-5 lsj+friction force on 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 2.0gmzw/;-;g puk-kg mass on a level surface. The coefficient of kinetz;pgm ;-gkw/uic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in 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 tuo3jfne ) u32fop of a 50-m high slope. If the work done by frouf)j ne 3uf23iction is $-6.0 \times 10^{3} \; J$, 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 plane. The plane is 4.0 m long and rises za,yjemd2a h dh. ;0( e:qn;lt2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the mee d mn: j;d;zl 02qya.,(athhagnitude 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 released from re*3(kb ntzvw e)sll8alua;x8;st at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the pla w xsa 3vtl;lunkb8z)8 le;*(ane?

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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 ya5 g5wfs:95kny85i mr3 uiwa a height of 10.0 m, and strikes the ground with a velocity ur9i nwf y3aa5kwsyig:m55 5 8of 7.00 m/s. What average force of air friction acts on it 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-kgr idb32/ -zxil boy using energy when he runs up a flight of stairs 10.0-mb3 2r ixlzid-/ high, in
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 a constant velocity ofacf yyw;7:e8 xr(d-ws 5.0 m/s. What power must be delivered to the object by the force?edys7(xf: aw ;cyr8 w-

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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 aw i-ruak *2ar+ 1.0 hp motor that runs for 1.0 hr? (1 hp = 74*u2r aa+irk- w6 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 whi /c (8qbbt4(zvb h1h5jg ldho-le riding. How much force does her foot push with /hj(vhc( b4q58zg hob1-d b ltwhen she is traveling 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 accelerates from 0 to 25 m/s in 7.0;b 5 ohygmg7z09tvrmgbti w0b70;0bw s. What is the average power delivered by the engine? (1 hp = 746 00h70 vg5by0g9bbtti; zm bogwm; w7rW)

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