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习题练习：Physics Unit6: Work and Energy
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 60，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test60.html  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。
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 游客未登录  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 u9c vsu7k *t:ktnit of work expressed 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 a system if there is(c;su*cqenw9 . y6)vqlzsro -ap6z z 2 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 p48pjil5pwb:5mop: atc n;p i,1agf+ against a stationary brick wall, the amount of work you docai8 pmt :+b:;l5 ,apgj1piw np4f5 po

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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 brr,ha6h , . sc+u7lt sgv20ekreing held there. How much work hc e,+u rv62h kgssl,r7 .r0tais 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 forward at a constant velocity carrying a 10-tp8n1u)aad-aep unf380y1 la N objee-f)1auu0 a y1adn 838lantppct, the 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 )z9ld5ms(m3 . dy kaj i/v j(dvck-d0tlifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work was dd)9kcdyzm5lmt(kij0-v3 (ad/ d v.sj one?

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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 work on the o gg/ohxpeqsr xr0,*)kl5u o3uvb cph ;i, d*0*bject?

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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 .c-)h,nqymy 3. , q( ppxtiuqa+oa.v dby gravity whileonq-.(vud p+)miaq x,h ap3q t.. yyc, the ball 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 Forj;ru0cjj0r5b*ih y* yce versus position (F vs. x) graph, represents0*ju j 05;rjcrh*yybi

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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), q1z(4pgxsdd2 byx.odk(6 mgr k50 b)ywhat represents the work done by the forc2rd( sx x0 y)bqz(k4dkpb5y om1.gd6ge 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 ener1 :yoekkzp5y8gy

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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 ond*;eo; n/lxy fta1)fw an object is negative, then 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)rr qs9q7 g8hc)ucyc. on an object is zero, then the 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 cah+u,:( f zip aq-k:z44vimr hgr, and is moving at twice the speed of the car. Which statement is true about the truc:z- g:4i r4(kz+iahvmf qp,hu k's kinetic 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 J ohf bnpjl. *1(7 w95 0k qwnzupk*bw1rhas half the mass of car K. The kinetic energy of car.unpl 9kznw qrh1jkbf(b7*wow0p5* 1 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 with half of its original speed. Whan: 4ny72zw 84bcjc bqvt is the ratio of the final kinetic energy to thby b8 qwvjzc7nc424: ne 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 movin4pdkdscv663s g at a speed of 5 m/s. If both objects have the same kinetic energy, whatdskc d6 43v6sp 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. A 1.0k43jrawt*n x/ -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 kx4*ntr 3/ja wdistance 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 certain distance qqzzlb3:.gl q(zf, -6p0empe on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditionqqq,0ell( 6fppzz g3 mz.:-ebs?

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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 elioy s)i(8 xhv 81wr3r+l sf+glliptical orbit. Neglecting any friction effects, what8y(w + 8f 3sxvsh+rirll og1i) happens to the 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-energhdf.ss92ui;bgc,c u 7y 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 system to hav uim5 oh)mos+ u79q9c-gd(jome 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 second objectc6lii l mz. ib0 petjq8;73t(h with four times the mass of the first i7ltjq ce6i p3(i.0;bzlhtim8f released from the same height. The potential 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 springfw/efiq he zc: 5h71*w causes it to stretch 5.0 cm. If anothwfq z17eh e/if: h*5cwer 0.200-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 lfaa34m8w2nh:prx) f energy 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 energy K, to its potential eneri(w2 c,q q3ilqz-j olwp*6u)jiww p3z (oqc26l-u,*jijlqq) gy 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 a hilm1p5:-9gu4k/ i7bj x vwah.ql c-hi tsl.

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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 eq il2cbuu6(8d ucf6h 4tual speeds along a level frictionless surface. They boci b6 86d4(clf2uthuuth 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 m+cx kh*.tkki(eu l19$m_{1}$ 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 conservatdn 80 bq,p6i.k1n myegion of mechanical energy for conservative forces,0id8bp en.q 6 myn1kg.
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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 buildi5vnf: xe 1-ijong, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just1enf xj-v:o 5i 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 30 J of kinetm- d6e/ k2do6u3 wqbq-of qy9g)iu be2ic energy. Do not ignore air resistance. How m9we)q6-f3oq my- ibkdo 6/2ebd qu u2guch 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 and loses 30 J of gravitatiog4(sdpn am5g:nal potential energy. Do not ignore air resistance. How much kinetic energy did :mp45sgad( gnthe 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 energyrm snt2)mx zb*ujt :7p 7nf+6a.
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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 ismzh 9p a8)q4aobuirsku/z2:-

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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 unitvq5v 4vhe0r vc9d/e j.j h)vz9 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, whi yw3lrrxs* h0d a7js8l9a) kbt6h. gc8ch is not a 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 time. To do so,q0 rn991b mm8zu soo +dj+.yrk your power outprb9jq+m no m01s.98dyurok z+ut 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 x8:- .ou5gjz,trrtbwconstant 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 vertxwj*gru mdee1pu xb00n1+( p :ically 2.0 m and held there. If the object weighs 90 N, how much work was done *b+ (:1xeudrjxm0p1w0 nu epgin 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 d, m m*sz8:pocjistance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done b8so p,m:m cjz*y 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 constant force of 5500 10ag2 ox0 iv+9 8imtpx;wvxivN for a distance of 50.0 m. What is the work done by the 5500w;tiv xoi18 0 ixa+p0vg2 9vxm 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 conxm2,h c 5y uz *mc)) /pttmvil-j2qj 8g4zf6zxstant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevatx6y2 f ))mhcz28v u/ -zc tt*4xm,mpij5gljzq or?

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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 ai 7 (8pkk:nssq constant force of 5500 N for a distance of 50.0 m. What is i8ps ( nkq7ks: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 h .2ur f9zp z.o+ewy6rm 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 5yq57u)ayls1(lgxay1(v h k udown 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 anmw* t-5rwm;tlel, m-h icy surface (assume no friction), with a force of 60.0 N at an angle 5-t,t*m mmlh e-rwlw;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 force. The graph in Fig. 6-1l0 *i ,tkhx,tg shows the force versus the object's position. Find the work done when the object m0h*t,ig txl,koves 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.ywx 8)gvu;g -c The graph in Fig. 6-1 shows the force versus the object's position. Findy- wvg 8;guc)x 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 rs8cg+;q zwk7k +rg y0in Fig. 6-1 showsgyrks rg+; +kz0w8c 7q the force versus 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 dirtad cb5nir( s2.wui90ection of the force. The graph in Fig. 6-1 shows the forcecw5u nd9.2ia(sibt 0r versus the object'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 applied to move a 55-kg cart (initially at res(./f7h .6 o flkrlwfwst) across a 10 m level surr/f w.(h6w lf o7kls.fface. What is the 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 ofi 0o8y1, re/ lobpha+8gy(his 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. +ypa 8s/e yo(8i 1i blh0gorh,What is the 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 of 5.0 m0w*c,8qae . ut/ho/g7bpok f v/s. How much work is required to stop the masst ,fowq08 oep.bak/v/c 7gu h*?

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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*/vdst1ehta3b91p75 ebmi afh0-aun distance is required to stop a car mp ede nhb v -5ba1su*fa/9i1t73m0aht oving 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 exerting a forcemdnq.wh3dj kk8) l9q/fx:(voub k + c0 of 20 N over a dis0 :3 x bd+ j(wn)okd9qkfum/ cv.hkl8qtance 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 vertix9ulane)-bc pcn.w :5lhu2e e3 i)oz0cal 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 horizontal lxpeb:2 e ch z )eclu-in)0n9ao.w53uly 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 into a bale of hay, strikaf) a(:sqr s)xing the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting (ssa:f )q)rax 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 a floor to a heivzr.-xw73 xcz ,vrqau /dm8 c z)dd;o1ght of 13.0 m above the floor. What is)3 d/ duzx; czv.czdwmvxrqoa-7r8,1 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 upush v.zt 8q ;81su/oga:bxt 5h an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the s5/; avt.18buhqg szu8 thox: 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 cm. What is +6mtqh t7i hzhs1)ub rzsx55,vq zzbhn7 z:8 3the spring consv7q5b,zz+5 xrt uzt3h: bn6h7q8zms)1hi s hz tant?

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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. .4cyo 8; dyc9w (o/h2riq nzoc How much potential energy oy9c ; hdqirc. 28w/yo4zo(cndoes 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 uncompressedolr4ecv; 6e+h yf05 fd spring with a spring constant of 25 N/m by 10 cm.5vdl ;ocr y04fe+e6h f

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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 stretcuedj.m t3obx/-i 0yq 5h a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is atd. q moiyu/ 0-3e5jxbt 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 initisdg d9jx 1d8h5l* ga(zally compressed by 3.0 cm. How much work is rex s 1(gd8aj gzhd5*l9dquired 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 a8:n;wl un www3 50-m high slope. What is the speu;8 nlwn:w ww3ed of the 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 off the top of a hill with an initial speed w,t i:zoh 9/zvof 4.0 m/s. Neglecti vio/,thwzz9: ng 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 bottom, it hasf+crv72y;ez j+xe + j4loa 7ix a speed of 9.80 m/s. What is the vertical height of7jvf 2o +j4r7cz;ixl+y e axe+ 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 0.7g0 do v9lmhx.tj5acjoy/ a3./ 0 m above the floor, its potential energy exactly equals its kin/vaj9.omaht/3 x5cl o y0jg. detic energy. 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, weighinxx5g +nbv24bw+1b ylcg 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At tx4+xgb b1lnvw 2b y5c+he 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 ground with a kinetu 5t0pp6ha6q yic energy of 220 J. At the highest point in 6 q6 ahpup5y0tits trajectory, 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 5- u,0/ykm 9gvy n /k2kcxw:hst rzby0bottom 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 thycrkskh2 y t0yv,09/x m5b:u- /zknwge 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/s at a point 45 m above the botto9k ld zksp*m73rx07bmm of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coamlksxzp 737mb0 * rk9dster 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 starf6bo g n-.k3obts at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be-fk b 3no6obg. 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 bottom of its tgd bp62b*surn ,4r+eswing (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 from thej s zspkko-w6oa/)c.) vertical axis and released froaj wsco-kpz)s/6.o k)m rest. What will be its speed at the 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 ipzm)mmwv 2x4d4-m q 3pnitially uncompressed horizontal spring with spring conw2mp4mvq m -zpd 3x)4mstant 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 st(p; qndn+yf 9wty;nx +op for a red light. What work is done by the friction forcef n+w;pdn(;xqn y t+y9 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 0 vun 3:v u j*.b96wa,c sapyfag p9qjp7u+d7ea horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will ae9up 9awg*p s7+7ufj u:6yn0.bpavcq ,vdj3it 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 movilorw6l-+ v .vfng on a rough, level surface. It has 24 J of kinetic energy. The frictionor6 +fl vv.wl- 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 horizontall*vm2 7 g *2kp(8ebgkmcu,qv hxy to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the magk*q2(v ,ex82 m7pmcbu*gkvhss 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 top of a/nn ztc +bu3h)w cu1s3 50-m high slope. If the work done by f)tcu+h1 /3z wnbncs3u riction 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 plan4b*lok7; hy:3c a 7ve8kwi y6;uy yxvow40 aiae. The plane is 4.0 m long and rises 2.0 m. It requires 3o 4axv 7 ko vw; iaeyhy3k76a;4y8c*liubwy:0200 J of 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 released from rest at the top of a plane inclined at 20e se bdz/b:o9i4 above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of thbzbo e4 /si:d9e 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 fromjf y6mn3157eoxc.*0 : ij6bcw njdc xa a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What averagyj.d 7ox6cn*1wf0 e:bcmxaij365 cnj e 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-kg boy using energy when he rub+qx7jjpz i;obr-5 v;3ja /1zl3cmob ns up a flight of stairs 10.0-m high, ijo;1x;lzbz b3qi7 a- j+ b pmj3/rvc5on
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 of 5.0 m/s.0 xnit2gpnxoe.( ,. vj What power must be delivered to the object by the fox n xog.j.vt,ip(n0e 2rce?

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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 enpwfodz(5 acb2c93l-u ergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746fzwau-pc3 lbc2 95 do( 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 mpq1f,jkjfi uk6h zu 4j/ p,ck 4fa9u,(uch force does her foot push wh f 6a4 ,j/uk 9c,u4f(qz1jikupkf ,pjith 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 dk8 i4mwl l s*mn1s-l7r3x 2ik7.0 s. What is the average power delivered by the engine? (1 hpsdl4i21- smmi 8lxnr37*wl kk = 746 W)

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