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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 SIgirj/ -/c*sn x ugp*uyr0w2u )e/jy4d 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 y)5t:)n :au vqyzt7 vpno 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 i bn1;nc wm .02z( emz4xxoc5ha stationary brick wall, the amount of work you dbxcn5( m2on;xmicz4 e z.h01wo

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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 vert7rtp*m(sfe c0v4 fie :ically and is being held there. How much work is being done in holding the box in thcrf(p7*ve:m s4tie0 f is 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-N ojnx jbvov5ai vh9 oz6*+ ;+jz-z*yd n(bject, the amount of work you 6xyjno(j+v-n +zzih ;*v5ad9 zov *jbdo 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 /4w48e9x8 box hs p3xdv9d,n1nmoxenthen returned to its original position. If the total weight is 30 N, howms438p9nx h4xoxd9bdoxv 1nn8, e we/ 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 3.0bv-;ss0j ex-l m2wf sqygracting 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 the work*(6rhb) , ta;srf5uhop mj 8nu done by gravity while the ball goes up with the sign of thpo *6n, ;ut)mj(fu 8r5rhbhsae 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) graph, re ocyj t t7/1eo9kwl*2rpresentskt1towocj9 /elr 2y7*

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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 repr 1-sbdf .g.syipw/d8o esents the work done by the force .db f8 i/ws- soy.gp1dF?

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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 p/r1 )w hnin7uhositive, then 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, thffd ijo( j3t.2en 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 tj84 kp z-sbuuv1 lt6(ajd6 :cbhe 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 a5o6l6h:xosjv t twice the speed of the car. Which stajoho :xs5 6l6vtement is true about the truck'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 has half the mass of car K. Themz(h;c1hy w,o0 dv+m i kinetic energy of car J, compared to car+ zc0wyvhh;, 1d( omim 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 h87bm ezy/cdn0ba 5n7 speed. What is the ra8b bza /0 cmdnhn75ye7tio 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 speed of 3 mi qs1r*qxgu75u f 6oaj uu(dw4 .x9o4k/s and a pebble is moving at a speed of 5 m/s. fg(o* q 6u1xk4u.aoxq9iuusjr w57 d4 If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with spelm-js4s.1k9 h rreei csl3 c6:ed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encoc cesksr r1i j9e 4l3-m.lh6:sunter the same constant braking force, and 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 brakeyr (u8f)e73h1 c;odrjb ;ncw ns of your car in a panic, and skid a certain distance on a stcn 37bw;d1h) nrr of(e;yc 8ujraight, level road. 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 orbits the Sun in an elliptiawj8sk 9d1scj +)x-cocal orbit. Neglecting any friction effects, what happens to th-kjadoc+8 ss1 wx9)c je 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 prijw j02*div/b6j 6uh xbnciple.
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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 negatr+vp whe*)ng(qin:lljb. h;k;g ;e)kive 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 abovej bbv4+q npr+2lp..tv the ground. A second object with four times the mass of the first if released from the same height. The poten.b4p2+r v+tlpjn qv.btial 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 s 8ejmk xp- *51h+cxiantretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring ck+- ip*xamj58nh xe1 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 syst*h7eb. 8jzv(t h:qvlxem

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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 i4tod;uiqhy9-s4 b+gn0g)c emf;pz e - ts kinetic energy K, to its potential energy)nm-b yu9sgpzhgie fe4 +oc 04;d-;qt 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 carexcq(a mrwjy,tn9q-)j nl 21+ 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 objecth t8vv,0 2lhkqzt;u6h are sliding with equal speeds along a level frictionless h8k 6;qhh vtu2lv,tz0 surface. They both slide up the same frictionless hill. Which rises to a greater height?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses d x.6(xi0x ynf$m_{1}$ 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 coa .0g:n1b2nx9oev ph tnservative forces.npae 9v2 1gbotn:x .h0
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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 buildingibklq +,sgpjv*. hi 2jus74m1 , through the air (air friction is present), to the ground below. How dohjikj+gv plqub4m s,*i1s7 . 2es the kinetic 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 /k s q3ub1h:bjhn45acz xa0p2not ignore air resistance. How much gravitationalb:p0zx4b/ ac juhs 2qh5a 13kn 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*e8 muqh)i j;q J of gravitational potential energy. Do not ignore air resistance. ei;)q u mqh*j8How 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 e10/j bepg/dva6sg5 hpnergy.
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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 ishv,,1tpan uo/r(i 4mm/dft g7

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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 op s4 :aa)91bd+ fardrff 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 +m 7vb7v eoa4la8 2ngcpower?

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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 a g:w(jrku +4lbxbv9/ one-third the time. To do so, your power oukbw:vaj l4+x9gu/(rb tput 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 fizylwvp;+got9 e ) 7s3tj+ d*a constant 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 thergc /dr8d/be e(e. If the object weighs 90 N, how much work was done in liftied8r g//b (cdeng 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 o6;x( pi(r t, eshs1m utbto-b,f 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the es,b s; xp(t1i rtu(htomb6,- 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 N for akky 7p1 dkz2d8 distance of 50.0 m. What is the work donyp dkz2 7d81kke 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 f .ve(en76finq()sbs force of 5500 N for a distance of 50.0 m. What is the work done by the weight of t . n sin6sfe(()ve7qbfhe 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 for at,9f(xsv5 wt z distance of 50.0 m. What i(ts 5,vz9fw xts 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 +9vh, xl4l+y m:d7 ebsvwsql8+p k di6m 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 mw *yp e8mq9g ig09)+ itg:ikqn down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little hdb/0xs:q - zhexu4(nsister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an axuxn (:dsz/ h q0-e4hbngle 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 0o1 0;cf 91t.ejrg+yr epzk rfFig. 6-1 shows the force versus the object's position. Find the work done when the object moves fozy1;p0re+1egkr9rcjft f0. rom 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+9 7gz y(u/ ni4k9 e6 +jtmsmuvifg-rr the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obj9(em /ryurf6s + g9vi z+ji7tn- gmku4ect 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 ddxpz,8ob 2 )njuzz5u6irection of the force. The graph in Fig. 6-1 shoz oz5p28bj u)x,zun 6dws 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 direction of the force. The graph imysnro kcr+ *b *;2z)dn Fig. 6-1 shows the force versus the object's position. Find the work donckr;nz) ds2mro*+* yb e 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 (iniy;5svfp6q;v hv(1x kh tially at rest) across a 10 m level surface. What is the f51 ;qhv6phx; kv (svfyinal kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-k4a- e,p )jox)pkx8yuh g cart (initially at rest) across a 10 m level surface. What is the final speed of th-8pjy),xaoxuk4e h )pe 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 much work is requiredou6v5 f u,d:blk. fkp: to stop the masl u:ukk6d, .5v:ffbop s?

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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 m;:dnnw.fj*ks t- , zrhoving at 25 m/s, what distance is required to stop a car mow;*s-k f th:zj.,drnnving 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 gun0dx9imt52lw-qtcc tjy )fk96 propels 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 0l96xcmtqijk y 5 9)c2-ttfwd 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 vertical component of i45muq tvt*ypx+,ub; :8wkwk 60 N. The force is applied to a box wvyub,m t+8kkuw q*ipw;tx :54 hich rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot hor8.d /qdf.*bhmblkz w6 izontally 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 averag8b b. kdfq*zw6/. mdhle stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above a floor -l4dp zvs7r v(to a height of 13.0 m above the floor. What is the change in gravitational potential energyv(7z -4pdvrs l?

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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. -45ah uuri )ydisjej86c ;2lkThe plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by 56ia8d )2;ijhyj4 surul- c ekthe 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 ontocv l;bd kz1.d0qv;ae dh8x 02u a spring, causes the spring to stretch 2.0 cm. What is the spring co ;cv0zd;ku8ahe0 ld qvbx.21 dnstant?

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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 cons6 c* lp*b 4s8osciic(vkux0 o(tant of 60 N/m. How much potential energy does it store, when stret iclx8o oiuk(*vbp c(6sc 4s0*ched 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 comq j+1h *wz3oxepress an initially uncompressed spring with a spring cooe*zqw +31 xhjnstant 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 spring constant 40 N/m from x =osqwi 74p (ib; 0.20 m to 0.25 m? (Assume the unstretched position is at x7i(qs w;p 4ibo = 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 compr ;e+eoz.irj r.essed by 3.0 cm. How much work is required to compress the spijz+o .;er.er ring 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-m high slope. 9cyr-mh,pj ztfi3s4 -7jv )gm What is the speed of the sliermfj37 ,y gsp ci)vth-9-m4r zj 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, pushu*,f c- 5drfdgai .1lqzs ze3-es off the top of a hill with an initial speed of 4.0 m/s. Neglszf,dluie af d- cq351rg. -z*ecting 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 inclty;d;l lez-x( ;qv)wsined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plan)zlqw; v ey;t; l-s(xde?

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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 + elv;grbef3sg+.n8kdyj b :,it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it m+br. 8j ylgk, dn;bef:gves +3oving?

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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 straips+*zk) 3rjd ught up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical enerzud3j )rk+*sp gy 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(kt8ob0a zhx2 )6 jlcy with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 c6zj2(0ao 8h)bty xlkJ. 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 j.emw1t+,qg54 cevjm rest 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 tq4w e +,.m5ejmt jcg1vhe top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s at a point 45 m above twt+:yja rw*5 fhe bottom of a dip (See Fig. 6-2). Neglect friction, whya* :tw5j+rw fat will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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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 bottg, n3j/km na+m6ka 7mnom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect mm3j+na 6km gna,/nk7 friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its swing (pollr*m j/ z3a-nint

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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 the vertical k*6/sww 7bwd4iw uo0 jaxis and released from ress0iw4d w/*w7 o k6juwbt. 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 innnx 9yt*k9wf 4itially uncompressed horizontal spring with spring co99n *ykf wtn4xnstant 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 fpgf)qqk f)*imlor me,3 np:5,or a red light. What work is done by the friction force aga*o,gep3 pq ,lifqm):)frmkn5inst 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 6; ,od en t,4kqbil-qr60.0-kg object and a horizontal surface is 50.0kld6 ,bo q-, ;i4qntre N. If the initial speed 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, levelb09 /wy.dc vba surface. It has 24 J of kinetic energy. The friction force on it is a consac . /wbyd09vbtant 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 horizon.om;vubfmd /05j q9 fe 6ob0 f1ntr+cztally 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 mass is moved a distance of 10 m, what is the change in its kinetic ener9fo o0r tz d/f0mqf;cn1+v.6em jub 5bgy?

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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 h7bg b4hsxp p(- ,n fmmlwxr:+0igh slope. If the work done by friction is7hx , s0rp(n mb4fb-xmwgl :p+ $-6.0 \times 10^{3} \; J$, 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 inclinv(bo; shzo -7 (-lztuoed 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 the magnitude of the average friction f zso u;-z7to(vb(h-o lorce 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 ofa:qbs.q+z (o g a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the+.sbqogz :q(a mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a height of 10.0 m, and strikes the g9anw*ocb 0k z1round with a velocity of 7.00 m/akc wo9 z1n*0bs. 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-kg boy using energy when he ruk .nx lyv2;z(nx :p4fsns up a flight of stairs 10.0-m hig xnks(2y: x4 lf;z.pvnh, 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 of 5.0 m/ro :y( y*xj8 k2m-quzye3cp u2s. What power must be delivered to the objem2 jczu: pr83-yuy y(xke*2qoct by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp5ytrok kb5b3veur+), = 746k3 ),uoy5vb br k5+ert 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 pdhig+nm ka.g:,s:)r riding. How much force does her foot p ,dhsm: pi)+k.gnar:gush with 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 0spep,sbo dfp0 v58a:0 to 25 m/s in 7.0 s. What is the average power delivered by the engined 0ossp5ve8 f:b,a0pp? (1 hp = 746 W)

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