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习题练习：Physics Unit6: Work and Energy
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 60 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test60.html
 作者: physics  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 exywyivk4ioa:pgzd 36vd(/f / 5pressed in SI units?

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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 +ijioz* lynl 3,h*3vha system 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 statiol68 hhy qq y0i4 jegej*px,7s)nary brick wall, the amount of work you dos,hq j 7 yg jix)hyl086peqe*4

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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 and is being held there. How much wori3* .zngtx6*spb cgc2 k is being done in holding the box in this posi g2**xbztc gp63cins .tion?

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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 constant velocity carrying a 10-N od uq8c 7 rmcdy,mwq4+4bject, the amount of work y 44w7,qmd 8u+yrcdq cmou 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 3.0fy1iv0fe hl y96y1(uo*l8imb m then returned to its original positio6vll b *1oyheu1fiy 980(i myfn. If the total weight is 30 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 acti;m *gi jq2p;bwng on an object do work 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 th4p+2 dpzt7pc he work done by gravity while the ball goes up with the sign of the work done by gravity p2t4h+pzd pc7while 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 m:a,mw vzxkp:,wx5 cpj,g -c 2(F vs. x) graph, representskmaw z-pcv,pxcm wg ,x,j25: :

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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 pocrtyxugabjh7843n: mic ,8 3tsition (F vs. x), what represents the work done by the force F? uy:4ac nrtb ,t3jg 3mic8hx78

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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 p3/ ve b:jkom3object'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, then the object's kinetic +uvrse 98 rr.xenergy

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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 kinetio i*jx-n*ub )ec 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 u/ao y 36.jhboas much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compaooy jb/6u3 h.ared 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 J has half th.+f0w,p ijjkde mass of car K. The kinetic energy o0+p d.,if kjjwf car J, 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 wit,(ovz:yo 6 jqhr m8+hyh half of its original speed. What is the ratio of the final kinetic energy 8mhy:y(+zv, q or h6joto 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 2/6 a6 ogrg:mpfdpei+ speed of 5 m/s. If both objects have the same kinetir2 +p:emfidg aop g6/6c 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(qgfp.gme:jq45 by5x with speed 2.0 m/s. 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 dista5. 4mxq yeqb :p(5ggfjnce 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 pa/)1 x;(bbgqa xeq)t(jn q f0ypnic, and skid a certain distance on a straight, level roa )1ynt(;q fx (qxg)0q/bapjeb d. If you had been traveling 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 orbitstqhm tf194re *2tk7 r)3o2cwhd+zp jl the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the plaftpkmh t) 7jz4hrl2rod+ tq 9*13w e2cnet'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 principle.v vsm:t8ufu 07h9ba*k
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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 have negative poten 3t,e, cju vltmk+eb32tial 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 aqir2mguk x1v*-ai 74rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the ra7aq*mg 1ix-ki4u 2vsecond 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 cau ;n a5a/8w da5cy1ut c)veddc(ses it to stretch 5.0 cm. If another 0. u 1e(5)ad;dd8ccavy/5wtnac200-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 of a syo5z)l ,ogsy;jstem

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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 energ ,;44 fto9t miz;sfskhqmvs);y K, to its potential enero;t;t9 ,hfim fm ;)zksq4vs4 sgy 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 of a car driving up j9sfsv-(vy- c 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 3 hd*upvddh,f1bk .e4object are sliding with equal speeds along a level frictionless surface. They both slide up the same fd.u fbh *1e ,dvh4dkp3rictionless 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 ;4zl 6h yv x1cpm lmis3c*+kp8$m_{1}$ 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 conser20y w khsx6gv6q1uwm )vative forces.qg6 0ykw21u vw 6xh)ms
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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 preriasn,)c)c c:k v. b.kqz h4 b669xf q04aziwfsent), to the ground below. How does the kinetic energy (K) just before striking the ground compare to 0v:4ksikb h66nffazqx c4bz. a)ci.wc q),r9 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 30*ebye.k* gto+ J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did th. *bgo*e +tykee 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 and loses 41gvt*9 hkca1y g xujkhc0a* .30 J of gravitational potential energy. Do not ignore air resistance. Hh a1cu4*k0c.gkyhx* 9gt 1javow 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 concpy(tv d7o 1d.servation of energy.
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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 isjxg +ta 4 ho*p wdwliw3g/2/7g

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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 uniues m -kf;0h+ fxxo/6et of power expressed in 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 a unit of power5oer4/t g+7qta8n1 u4pal y;hzdzi:a ?

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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 timez: ;oi/,a6r nqgc 5bupgs:f,g . To do so, yog::n os/u5,6g , qf;gczbaiprur power output 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 accellvaro;ap-za+ lw- ,6leration, 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 90dq1.md g7 pa)f4wwz(v N, how much work was done in lifting itmd pzw .vqf(w g)4a71d?

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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 physi2-yf;fdry 0k fcs book up in the air a distance of 1.0 m, at a constant velocity of 0.50yf-0dr k;2ff y m/s. What 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 witu:s.1e s wujybnvdj4if n; 2a7z;/-on h a constant force of 5500 N for a distance of 50.0 m. Whadjwvue;/ 1u:ssyno7-f4i j a z2b;nn.t 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 constant force of 5500 N for a dis5 x4ih2h1p x1jcpuw;k7jc j9; ndkxz: tance of 50.0 m. What is the w7jdx:j1cn;p94 kpc h1 hxuw;zx5ij2kork 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 isugdx 8*gl (/nx pulled upward with a constant force of 5500 N for a distance of* ( /xgxngdul8 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 pulled 6.0 m up alu clj5c z,:ru(gj58 osong 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 down a ramp, inclined at sl94:t(c ln *mmtr 5pf$30^{\circ}$ 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 sistephh,ue;:lyy) f9flx:q3:p3e pb b8b rr Sarah in a sled on an icy surface (assume no friction), with 93 yrxpp hy::38:fpheqf,l b;b)ue bl a force of 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 9;yql7 p p)63vxqwwkp force. The graph in Fig. 6-1 shows the forcev7wp9xq6 ) 3kywpplq; 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 objecht 80*j1z. i vwzkf/bot in the direction of the force. The graph in Fig. 6-1 shows the force versus the obvjio/10 w8f t.*zhkbzject'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 thez yip ncz6ma-z0h (01e force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when th0i0z (cazyne-z6h1p m e 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 tc 9jib -.s0 polx67elzhe direction 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 from 0 to 6.0 xipjlcsz.97l ob -06em.


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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 (in h. am7bl zfvl5z77yxjs2 gcw:a/3hh:itially at rest) across a 10 m level surface. What is the final kinetic energy of the cart?ajm /vh:7w.hzy2h3gxl: 5bs 7czfa l 7

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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 l y vmmt1;h1qjcjt //+at rest) across a 10 m level surface. What is the final speed of the cahyq/t;mjt jc 11l/vm+rt?

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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 speeded;a d/bm. nk, of 5.0 m/s. How much work is required to stop the mak b;/ne ,addm.ss?

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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 sq)9 f2ck ;az)q;u fywctop a car initially moving at 25 m/s, what distance is required to stop a cq q9w2yza ))kc;f;uc far 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. It is cocked by exertingtg0-zx qa0gkve 4 7i1t a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible 4ka71g vgi0zt tqex0-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 vertiz;m vsaz2 2bh4wv1p3kcal component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally alos w1p a4zzm3vv2bhk2; ng 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 into a bale of*fk.sijz/jt zf v2 bs h,--i7q hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average s-hjf ftq- 2k7s. zv*s,/ziji btopping 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 move 24*q(lsuw,kzn c+ d7lm-tqobd from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential energy?owm*b7ct (l4-zdqlqk,usn 2+

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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. The plane is 4.0 m longc t51qa vrz-3b and rises 2.0 z1a-vtc r5 bq3m. If 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 spring, causes the spring to stretch 2.0 c wio+ue19iwn.m. What is the spring coi+9we nou .w1instant?

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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 tz4euo-a8d*/-j6 ym q aztg oj6/v; tbpotential energy does it store, when stretched b68a zmybt*j/e-d 4ot jv 6oqzu;-/ga ty 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 uncmqv(hfj z k0p :mnwz6oat02: 2ompressed spring with a spring co2wz 2np oatk: qvj0:hzm0 6mf(nstant 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 stretch a spring of spr ( lx,kc3jo+(twwow g(ing constant 40 N/m from x = 0.20 m to 0.25 m? (Assume glw,wx(wcot(jk +(3othe unstretched position 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 ej 6c)jkco,z8constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring8j,)jez k coc6 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 to3q 0leuj w6o;kp of a 50-m high slope. What is the speed of thlo30u wqk;j 6ee slier on 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, pushes o8ua3s3rt) c0mfzgm3 hff the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevatiz r30hg3t3c)mmsfu a8 on?

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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 ineyhm8cn/ga7b+7p x0,wivp /iclined plane. At the bottom, it has a speed of 9.80 m/s. 7ga8 +vnmw7p/hxicb /y,p0i e 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, .44z3z2t)bpifzfxp py1j rk.its potential energy exactly equals its kinetic energy. How4zb pr4pzf2j.y kz xft i3.1)p 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 lever b*91cob vb1wl with a kinetic energy of 40 J. At the exact top owbc v 1bo1r*b9f 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 kinetic energy of 220 J. At the nm b,yj-s/+fr highest point in its trajectory, its kinetic energy is 120 J. To wjry+ /nm ,sfb-hat 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 a-9cfr dl xd;vc5*cw0 wt 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 the next slope, which is 30 m above the bottom of;vwf 5dwcldrcc9*0 - x 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 ai3daebjak s(59p *d:o 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 the roller coaster at the top of the next slope, which is k: dd( e oa*p9bsi5j3a30 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 f:,y9 y kq9 m.rip;ousabove the bottom of a dip with 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 next slope, which is 45 m above the bottom of the9,p;suy: f ky.9oi mrq dip?


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78#
 
  What is the minimum speed of the ball at the bz:ku *100icqzbbe s-mottom 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 w09 eqwnl u70kcm away from the vertical axis and released from rest. What will be its speed at thu0 qnlew7w9 0ke bottom 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 initiallywf6s o 84(phdm uncompressed horizontal spring with spring cons6 p oh8w4f(sdmtant 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 2000l1 1cq,vvk 3hn kg car to stop for a red light. What work is done by the friction fhnl13qv ,1c vkorce 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 horizontal surf0+qd;:0bsux2efil) a ggl 4gacal (v-ace is 50.0 N. If the initial spea4quexlag(+ )02:a l -bgdgfv0 ;sl iced of the object is 25.0 m/s, what distance will it 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, lev25b tzjtn; m ez:z(qf4el surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far w ej;z4b5q: z t(2tzfmnill 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 g1;h2: 0igg j nf8gio)ni iw98 jakup;2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a dis9k; npfgg0jia 8i;huin o8gi )jw21g :tance 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 thexbk:/hq ays .zt 4kk41hadb:7 s: mgy6 top of a 50-m high slope. If the work done by friction147xhsg4ya6:aqd :b hzm. / skkby: tk 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 s;2yco7h-f6py5 h.n: ms)y thbx yap7m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the ash.x 57b2yh-y y)p no h fp7tcsym6:;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 rest at the tob07kioj /+l/(ins xr)ce y3y4f- r obbp of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What w-+nk (47xbroi ol /b r0 cy/ysf)3iebjill 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 xbtuuw06 +rz9y g; ac/4u7dfdfrom a height of 10.0 m, and strikes the ground with au4f+7ctayz9 xu0gdr;ud/b6 w velocity of 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 609a88 yxzhy1zq 1ekkksbf+ 4(o.0-kg boy using energy when he runs up a flight of stairs 10.0-m high, iq s9+ 8bze(ykkx1 aozk8 yfh41n
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 objecttse+o1-l lad9 , teuxvb1g9 +r with a constant velocity of 5.0 m/s. What power must belro1t+eb,t1suae99 x-+ v gl d 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 mo gr*2e p3rt*ufzi;tf: tor that runs for 1.0 hr? (1 hp = 746 ; u**rg:3t i z2fteprfW)

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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 her p c+ hb k7:q)3erb4+ddjk fv8kfoot push witvq+dkjr):df8 4+b7cp3hek b kh when 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 s. What isba- .wf1ebl63s(sl )vs bf5ef the average power delivered by the enginle5sb)sfew1f-. asfb3 b l6v(e? (1 hp = 746 W)

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