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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 exur021t . b7jlbi pmjrm(7i;jrpressed 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 no m0v-*-u6gok fks yznqt //um0eotion?

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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,g i:8 5bez+/ lug(yskv3x bqkount of work you d+bz :(kybqe/x uivg 3 l5gks,8o

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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 71mo 7bb kf9 7ua:aplpau:pb+there. How much work is being done in holding the box in this positiom k771f:bbuaouppaplb:9 a+7 n?

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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 fo fhhu*;-dsf:-cc/dpk m ( s1hwrward at a constant velocity carrying a 10-N object, t-dd:( mck; * hsuwcp-shf1/ hfhe 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 lifter j(a+iaqsk wv-yow85+3b oj /j0f1vm d vertically 3.0 m then returned to its original position. If the total weight is 305f 0j8(y/j++rw mok wa1i sva-o3qbvj 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 oi:kcusgxw;1,*6y8 z lc2xd wpbject 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 s4s)rmq (ini qm.ps7,kign of the work done by gravity while the ball goes up with the sign of thknsi q 7qrm4i,m.)sp(e 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 curve5e vdpy+ -eicc(s lsoc(8f5o-, on a Force versus position (F vs. x) graph, represents( eo ccfyi 58os(pe-lc- s+v5d

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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 positb2 sjt)9 r ue9qc-w 6)gm7cwtmion (F vs. x), what represents the work done by the force Fgs-7b) m) u c2jr6twmecq99wt?

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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, vg8nn x,e7infb afke 0evu3)3ii, qq(t 9j.+pthen 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, then ty5*z +o .eycrnhe 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, then9j o 5) dl7gepk-a9++hlbrttu 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 car, and is moving at twdz(2 fawzppn- 3.. ned.*ntqdice the speed of the car. Which statement is true about the truck's kinetic ..ndewaz 3t(-n zdnpfq 2*.pdenergy 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 ca-msp oj/gy,n;r K, and car J has half the mass of car K. The kinetic jsy;pog m -/,nenergy of 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 with half of its original speed. What3mys:h5 da lc bs8xn.d9rqg2. is 2b3d ds5 l sm.x: ayrcg9n8q.hthe ratio of the final kinetic energy 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(0+l a-krl6eoyw m8brg6qf 9 x speed of 3 m/s and a pebble is 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 xo + me86-(0r9a r6gyqflk lbwthe 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 1.0-kg mass is moving aa cs4q(pxn9 b:ds 7xsb14pg,with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to re1:daax bx ps47 s9b ,csnpq(4gst. 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 sbos 05 z9c kx27pi,/iogkmo l3kid a certain distance on a straight, level road. If you had been traveling twice as falooo53/cip2z b,x k0gm7sk9i st, 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 constantra-fpb:sm,c omcv;8rtaf ;(2 mass orbits the Sun in an elliptical orbit. Neglecting any fricticafa2s( c tf;8bp-m ro:vr,m;on effects, what 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-energy principmt *g:zsr aaa:h0)9 pjapy:xv0)p7j rle.
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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 tobo8aq97 h woq7 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 second object wi 5o9xiiw- uvx+73ketgth four times the mass of the firstegvxoi9i3wxu 7 5k+-t if 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 spring causes it to stretch 5.0 cm.c 60r tw6hntrtg.c exs8q0k7 * If another 0.200-kg mass is added to the spr86ncshk.7x0tg06e tcw * trqring, 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 ofz cc+oc;y e.j- 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 pojmnzdhi759 j wt0(c 9fxgf2o,tential energy g2cnjht 9djm5x,9iofz ( 7w0fU.

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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 rsl(n) 7bqc)z,fy, lia 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 obhe7g3*4pu0c x,8 0vvzprxp) wk-n n4xso6xjeject are sliding with equal speeds along a level frictionless surfavgrow- he 830pecs7n x0v44)xxpk,zjnx6*u p ce. 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 zmn/j(s, j +pc4dz .pgue6ra) $m_{1}$ 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 conservative 6q9rlfa +v8 b1pv hdz)forces. p9h8l61aqzdfb +v)rv
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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 ofb9d5n6lf,gku zk0+x f )v;yse a building, through the air (air friction is present), to the ground below. How does the k kbgf u 0k+s9z;ne6yvdl)f5x, inetic 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 30 J of kinetic energy. Do not ignore (ehxi4; pui a3 yte1-,c8llmuair resistance. How much gravitational potential energy did the ball losxme4ytul e3( ca;,-p8ilhui1e?

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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 3)-r*qnb 5h2y g)xo : kkwte)-orcpie/ 0 J of gravitational potential energy. Do not ignore air resistance. How muchy5kr2t wb)x:o*-h pekcq /)no r-ige ) 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 con0fhzqgi(h /d s+sze)0servation 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 isk.+-bcvzmu)an+r9 q * qtmckr4* dzc)

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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 unn59tt 0 tcp5;sb0 qwh6tsj8hnb4bw l) its?

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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 ofj22, n k5jqpoxu4 ok nc/y(9wm 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 o.cj 0ycuv3 e8zne-third the time. To do so, your power3e8.vujc yz0 c 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 acceleration, the car's engine t-b: )qyo w+mth7i 6sqmust

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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 tfvu45u 0a wg.tm0 ptk(k0 0mfweighs 90 N, how much work was dong v . 00umf pf04mautkt0(w5kte in 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 cj 1/uuyt yk r9iaemut 90n5c90onstant velocity of 0.50 m/s. What is jcuau 01i9t0 etkn y5 /yu99mrthe 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 cxsjqcn53tu ky,9 -uc a 0h.ef4q8:vzfonstant force of 5500 N for a distance of 50.0 m. What is the work do89 s3,. uv:x t e4yhza5f fuc-k0nqcjqne 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 wivq4h l mb*-ci ro88h3gy0 p;w6xdtm3g th a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight ib64qvm gwo 0mrlx *-tcdp8y;h33g8 hof 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 forn fs3i3e+-m yl4- e : mr+aegnp-khvp7 a distance of 50.0 m. What is the net wor ngpe a-+ ile4 s3eyvh:f+n3p-k-mr7mk 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 uwfnz5w.+e( s pe.wjw3p 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 down a ramp, dw7km( iu4s1j,ist u8kvl;5 vinclined 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 Sa-yq,v6j un9*wdy bh7rrah in a sled on an icy surface (assume no friction), with a force of 60.0 N at a 6uby9*,rjyw7 -hnqd vn 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 for 1fhe4sgvtsh3 +w s-;rce. The graph in Fig. 6-1 shows the force versus the object's position. Find the ssg+svhtr1h;43few- 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 dirstxvy a2c;zknx,m 8q73hox8s qa 8 (xvkb77*oection of the force. The graph in Fig. 6-1 shows the force versus the object's posit a7vh a;3kx8z77y vxkq,cxobqox(t2m*n s88 sion. 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,qllz;)syu pmhjm kx5t,4j+ 6. The graph in Fig. 6-1 shows the force versus the object's position. Find the work donllk5 +x ; qtpm64)ymzh,sju,je 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 graph in Fig.ri*8t:pn0rahn r)jl e, vht5a 7;z 6jo7m;tkb 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 tj 7*rjtvr rzn;0ae h5bl78mtkph ) i,t a:o;n6o 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 carmghw y-0ml t-ho7) v8mt (initially at rest) acro-wmhg- h v08mo7m)t ylss a 10 m level surface. 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 of 200 N is applied to movet*q2pw qwe+ 1wpbv:(: 6aq9 zm -pkzxf a 55-kg cart (initially at rest) across a 10 m level surface. What is the fe9 wz:p qxzk pqfb-q pavm*6 (+ww:1t2inal 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 m/s. How me 0jkri/7g3fa b5q)qhuch work is required to stop the57kjfhq g r3b 0)/eqia 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.i:cswnr/t b 4 xo,-xcc +crb5 a car initially moving at 25 m/s, what distance is required to stop a car movingccx.s5ntc+ /i br: wc bo4xr,- 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 propelsb7m5t jco) sp- a 10-g dart. It is cocked by exerting 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 ne)pbctms j 7-o5gligible 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 vertical component of 60 l(jjsuis n m)) wie2p k6h*72rN. The force is applied to a box which rests on a level frictionless floor. The njkulrm( 2pe))i 72 *sswj6hicart 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 into a bale of hay, striking gb 4ju )uopx9kef8jxpu,9 uf f,5;o- cthe hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?94k ;5j -eu,uu,8ffxp9 fg)bcjoxpu o

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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 gsp*cp9 d -gy2 ahw8c4 9eyc.vheight of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential wy8g-492e.c hc9 dy vcsgp* paenergy?

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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 long and rises -qv 7 k.)om ar2e ez//z*gdjkj2.0 m. If the plane is frictionless, how much rz dajk7/2)o */ zkv e-gjmeq.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 s itfn,7dt.*;b(b5 plykir ef(ccy-8r pring, causes the spring to stretch 2.0 cm. What is the springrlbbi k - ey (n7,c;ft*r cpid.tyf(85 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 con r6;z8:tuuw(uihy d*a.tbn -wstant of 60 N/m. How much potential energy does it store, (wwu* 6t dzn:ua;8uh tiy. b-rwhen 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 compgf vwbzc* ,9i)-n; jnxress an initially uncompressed spring with a spring constant of 25 N/m by 10 cm.i,bz *w)nn9gfxc-jv ;

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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 sao 8ng,2al :vgn 5y0wda,mug7r0l,xjw 0p :z vtretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25w7g r:: o2 g ya x,nvgz,805lm,nud0lj0vpaw a m? (Assume the 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 constanvppv(c( :p-(nq*ctug t of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spr (vp ( npu*t:-cp(qvcging 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 the7 6p7ej6bbtn ecz 1my)z k397 fcgzp,a top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect fricti77, bz9j6eytpaz6 n zbe)fc7mpck31gon.)

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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 gm7w7 5r8 wrwchill with an initial speed of 4.0 m/s. Neglecting fr58cw 77grwm wriction, 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 bott11k -konf1hi+bfva0x 6.r+alttxd,f om, it has a speed of 9.80 m/s. What is the vertical height of tao.n f1bktx61k h,irt+alx -+ff0 1dvhe 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 al-t2t89xbwgmtabyk0/t g 9k5 bove the floor, its potential energy exactly equals its kinetiax/l-gmw8t2 k9k0tgt59 byt bc 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, weighing 10 N, blasts straight up from ground level with a ki mdd;0 ni(i 81n7rbmnxnetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. (nbi;d m0 mdr18n7nxi 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 d0xll+x;l3p *x *9rq*srf 3 fyw,vi5pvb 3z gcthe ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To wha,3z;xb 9v5pylp xcqr3gli+dvxr*3* *ws f0lft 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. pk ;b+u k5pmxhlr1l; 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 ru kb .;p5+kl 1p;mxhlthe 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/s at av gst+:al3gv. 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, whichagvt+ vl3 :.gs 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 o47kg+b tumf*p f 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 ne fm4gk7tp +b*uxt 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 itpd6 z zmjk/k9temj+2p3e d(p9s 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 syf87i )iudl7 bbfe15is pulled 30 cm away from the vertical axis and released from rest. d7ffebbi18i l7 s)yu5 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 initially uncomh71y02ftm huzn or ;,tpressed horizontal spring with s7,f;mu1t 0n 2yth rzohpring constant 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 ati.z;qlru8:nwun 8p 9z 22 m/s, slows down her 2000 kg car to stop for a red light. What wornul8rpq zuz:w i.8;9nk 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 for;vnz + 5t,:f+nyhpxfxr og9o 9ce between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what+xf :yn5n 9;gz9 +fvop,orxht 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 movhw ,1 ijht.pa qj qh o-5ui,l-r9blj)2:* pqvming on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slide:--ioq2rimj. avh*uj9qlt pl h1qhb) ,jw 5p, ?

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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 mass on a level suljd07 acnwv)8l l +e5:m n-uqcrface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distv:5+a8cjcm-dqnwln0leul ) 7ance 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 50-m high slope. If the work gcb) os/7j.ildone by friction isljgob)s/7 ic. $-6.0 \times 10^{3} \; J$, 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 e55ol+p8jmg n up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was th5l5gn mo+8jep e 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 f0w6 5 ktxq(:v:bbo8a um,bkfrrom rest at the top of a plane inclined at 20e above horizontal. The q: xb :wrfv bto5(uk0amk 86,bcoefficient 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 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 wsrv2:(mf0rlai: cz *qhi,7 ea height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force orzvasm lh*ieif(::q0rc72 ,w f 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 energ *t7sel1n8b g uj.xchzj5je h++wp+9qy when he runs up a flight of stairs 10.0-m highhluw9jcs8j .+p+7+q* e1jhbgxze 5nt, 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 needeykh x0vrm:l+g9f)e6 id to move an object with a constant velocity of 5.0 m/s. What power my:lm k0ifh)e 9v +rx6gust be 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 tanr93.ksl :4nmj,m y bl61n gwhat runs for 1.0 hr? (1 hp = 74m:yl1arln,.ksw93jnn g46m b 6 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 doesef)2ng.;/ v 0 ;vwb- bmdzv( csavk4hz her foot push with when she is traveling a/;b( )dz k0nvgwzhafv -bv.4ve 2 ;csmt 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 7o4 ec4;ga f;r aigp3fdq9j6 i(.0 s. What is the average power delivered goa4 ;g9rfe3ai;4 cj fp id6q(by the engine? (1 hp = 746 W)

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