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习题练习：Physics Unit6: Work and Energy
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 作者: admin  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月26日 13:45  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work expressed in SI unia6) zuefsf: i*5ryw,u ts?

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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 systde tc2k7u.s8x em 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 stationary brick wall, the cayuu1ir,8v swu*44j , *zl lyamount of work you do*j cs1u l4, y iu4*,uy8rzlwva

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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 imv7rhy (l1 .pa9 s+d/ fylh6axs being held there. How much work is being done in hoadyp(hyfr/ lhxlv1a .+6sm97 lding 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 velocity0rq (youye(b, 4foyj0 3i+cqk carrying a 10-N object, the amount ou3( yjbfqy0ok0 y4c o+,q (iref work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then returneac 4 z 6l:d bfoxk4 m1g95q6h9rtm8jdnd to its original position. If the total weight is 30 N9n4 6htmq4:6o1dgxlj r8fz kamc59 bd, 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 actm;m 9kl16pajwnc v r6s1;g,rqing 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. Compkjf)s4;fhx ij1ofs* m ;mc/ z3gy-6ifare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.hk i*m;o)yjmf4fxc6gfs-;jf3 i /1z s

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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 positc --ch4t cit/zion (F vs. x) graph, representszcc 4-tih/ ct-

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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, a lkdo+ q3qph//nn.h;vquo+. x), what represents the work done by tnq /lhdqv +.;h qpu+o/akon 3,he force 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 ener0w(gslg0(mioe*rikc q o 2mu5t3t*8y gy

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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 obje, rvwuyz(9t: (42uxq1bsdy b hct'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 9xa eg/ybz66jobject 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 */fja+8a,rb 7mu ana was much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the aa wfam*,bu/ njra78+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 thwdb opclcs4kgbw tr 4m2 /808+e mass of car K. The kineti8k ol rm82wdbs40 +bw/4pgcctc energy 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 witko5y,y+l2w6 d j2xxzhh half of its original speed. What is the ratio of the final kinetl+6w yhxo d, k2x5j2zyic 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 mf,:xnjk,g rr l qg,k:4/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 jfkr4 , nxqg,:k,g:lrof 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 bqfs h6ln6u88*x .)w wxzs0dmwith speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.w6fnxz.*d8s su 8q m)6 lwhxb00 m/s. Both objects encounter 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 brakes of your car in a panic, and skid a cerfs;xr rkj-wxmy cw*f ml7 d .)/.zq-*ftain distance on a straight, level road. If you had been traveling 7zfw . f-r)ymklmw;x*qrj-*/.fcx ds 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 mas ;6fv:sa1mc/qd; yenzjj0fl0 s orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happensf1vmfyq00dl/j 6 ;zsne cj:a; 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 princ92+q14ym,dsc,kjf b9on zukl iple.
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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 pot zsoca ..i2zv1ential 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 f)pd(e5,w 03anh,abj9qk rhiwith four times the mass of the first if released from 3d,ka(0n f,r9jp)ibhqwa5he 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-(7ndpwsp1t k the end of a spring causes it to stretch 5.0 cm. If as t1k (-dp7pnwnother 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 eng)uc7uep0 n hv 2xsc5-ergy 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. Ccjpu,lm9(1 +q o:se)p pa pf.oompare its kinetic energy K, to its potential energy)joq+eo(s m,p:1uap pc l.9p f 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 hi 5:olmku.utq:-ihh 76h+ccup 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 veryhzr5ft;6 q;ejn31bk /jyt;gq heavy object are sliding with equal speeds along a level frictionless surface. They both slide up thyzeqt;1kh b/t jg q;5n; fj3r6e 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 wa 2c gh6p(/.dufo xr2$m_{1}$ 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 mec0 4sh14r fhc6mq *uxdthanical energy for conservative forces. m6 dr4*01s chfxuh4tq
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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 j3 57u qx ekjjsxr-61dsp25 xlpresent), to the ground below. How does the kinetic energy5xxr7j- 1j p6uq5xks j3desl2 (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 aiv*nh23c 0 thg irtk02gr resistance. How much gravitational poten*g hti0 rh2 v0cnk3gt2tial 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 dised2 w76itj7melw rn79kso2 nq3wt *4rtance and loses 30 J of gravitational potential energy. Do not ignore air resistanceworj2s* t747q2kdi9nw3wm 7e lne6 tr. How much kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservatix *ypv- pq qst/0;sap4on 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 is;dpjufxx k(w.c 40 g f21 r(wa1-hmllj

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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 e;x8)q8q4xna- lc xdac xpressed 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 u6eqfy4sw-7tf 4p tv2whq1,+yobk v(init 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, youya 6j(t/ bgtn; did 3 times the work in one-third the time. To do so, your power output must have ;a tj/(y6nbtgbeen

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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 accs*odk,.qt.p ;)j)x gi5 lrtm,hl v dn-eleration, 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 heldk t1(0wp0; vbptlzg*x there. If the object weighs 90 N, how much work was dozl1p*tp(txv0g b w0k; ne 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 ascplw1 4u 3t0-iqw lu/ir a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work doniu t3cl 4s0wwq1-up/ le 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 constant force of 51 xegol; xa-; :(rnpni500 N for a distance of 50.0 m. What is the work done by the (a-l1 ;;gripx n:xone5500 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 f pfw+7z rx2xa4f70 hxpulled upward with a constant force of 5500 N for a distance of xf7+ ar2xhfxz4f7p 0w50.0 m. What is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constantnyqf6wj( h7n+u -plb2 force of 5500 N for a distance of 50.0 m. What iq+nwbnfyh(- l 276 ujps 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 65i mpv1uggx2(.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slides 8.0 m down a ramp, inclin:s -3jtq txvv7 )(rcck)rm biwpy44 e8ed 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 sleo8 xd2k9sz yd2h ia+d)d on an icy surface (assume no friction), with a force of 60.0 N atzdxsoa 2yd2hd)+k 9i 8 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 thed :b2y -xw y)1drdxr6m direction of the force. The graph in Fig. 6-1 shows the force versus the object's6x)dxbd2yd rry1- mw: 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 object in the direction of the foo r*wqy3ucvc)z (.ef- rce. The graph in Fig. 6-1 shows the force versus the object's pos -)qcc vwz(3f* e.oryuition. 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. The grapyc5r zqo1os.1 h in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves1oz s1r.yocq5 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 sp1i,o,7+ 3gix lmt6vson)x zforce. The graph in Fig. 6-1 shows the force versus the object's position. Find n7 ,xstix)i z1sg3ov o,l+m p6the 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 i*hsrq/nibug 95s)yi rgd31, N is applied to move a 55-kg cart (initially at rest) gq)r3 nsisu br1yi,i*9/h d5gacross 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 move a 55-kg cart (init fifw ykt4a,h 7,v32wiially at rest) across a 10 m level surface. Whawth,,347 ifi ay 2fkwvt 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 maan:1a )uru8 j/s. How much work is required to stop thej n)8:uaar1 au mass?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initially movind5vz .rcwvt h0+p8 c:qg at 25 m/s, what distance is required to stop 0d+pv 5 .c hqcw8z:rvta car moving at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is 8y nj5 gj;o/xdjr- s yl,j7e-vcocked 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 negligiblej8j,j-/gdjr n oxysvy5l7 ;e- 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 cox8 ;x5.e r+rwpkkx z5qmponent of 80 N and a vertical component of 60 N. The force is .xwkx55;kp erqz +8rxapplied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 op w +c1:kc.brg is shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is th bk1:cprcw+ o.e average 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 ofkrc yrj ev,q.b;l0;/ rod0a6 lxpw9t+ 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potent,l;;/qt or leyb6rw x00r+dcv p.k9aj ial energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plmxv2z7ne 6 ecwmu90 aod/ 6u0lane. The plane is 4.0 m long and rises 2.0 m.e0 6dl/e0 vxocmm9u n2z76w ua 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 .k ,iotoru6n0 spring, causes the spring to stretch 2.0 cm. What is the spr, ronku6. toi0ing 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 characterizwl0 r 6sf42rvded by a spring constant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cms0 2w4lrdrfv6?

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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 compress59e0)y lfp lpkkc7h:o an initially uncompressed spring with a spring constant of 25 ecf)p: k5ol y9 h7lp0kN/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 ty2txo 03c( garmjd*;t o stretch a spring of spring constant 40 N/m from x = 0.20 m to 0. 3x2ocy;ar(0tm*gtdj25 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 constauv38a /*: uvxcf c 4b4.h(arcmu/hjmgnt of 15 N/m is initially compressed by 3.0 cm. How much work is fuj/uxmucav:.3* 4mc/vgba4( h r 8 hcrequired 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 starts0-, njig57dpb9u0j wq- nalt d from rest from the top of a 50-m high slope. What is the spt-lub,gp0i jnj 09w5q7 dad -need 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 k o +4mb gf-h,pm+xjln90d6 ,cdmxl m,dg, pushes off 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+dlo6,dfm ,ghbmlx4jmmdcxp9, -0+ n 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.hw, .u), qk ypvfelu* has a speed of 9.80 m/s. What is the vertical heuy ,*q.,u)w feh.lpkvight of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, its po p*a-h9p soa.g;ft,rhi3kll g33jt 5 utential energy exactly equals its kinetic enel a aph3pt; tkuri 53*9- lfhg3gjo,.srgy. 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 fro. +xjmaikrlog5p1:t 7 m ground level with a kinetic energ1 :.jro5kgt x+7p imaly of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the grounrfmjfyf +o xi+72y)5 8tzvl4.8aka ndd with a kinetic energy of 220 J. At the hiot)f8.n yxkzf+l5d2 8m+r 7ijy4v aafghest point in its 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 fdwp; l7xg 9zo*x/p7ca point 45 m above the bottom of a dip (See Fig. 6-2). Neglect fri/xol ;zwx7dc pg9*7f pction, what 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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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed o(bp *997c t4znye( 6oogln wmof 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 *to 7w49en o 69gnzyp bo(l(cm30 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 poi;+ ,fwox d3bdant 30 m above 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, whidda+f x,w 3;boch is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ba gsmbsy-(x exh-2 n)nuzh)0- ull at the bottom 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 cm away from the vertical axis and renjb-6 33dhwjz g8ew5gzqf7g +b / 49re;lcbuxleased from rest. What will be its speed at the bottom of itbrnx4 8eu/ jdz b5;-c 93f6 bw3+qgj zghlw7ges 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 ini9jtp t 7-g7gw rup85jqzg* 61h,jf wbgtially uncompressed horizontal spring wizhp*wjpwb-97t8 gg6j qt7 5jrgfgu,1 th spring 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 at 22 m/sqyd bd3u5dh -r7bc97dw1n s)c+;xn- rthz1q f, slows down her 2000 kg car to stop for a red light. Wha1d hdfz y717whx s dnd )nu b3rq;q9-t-+bcr5ct work is done by the friction force against the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg object and a horize3wcxe -v(gw3ontal surface is 50.0 N. If the initial spe(xe3ww-3 gveced 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, level surfacefh3j ,e4kbj;q . It has 24 J of kinetic energy. The friction q3;f j h,4jebkforce on it is a constant 0.50 N. How far will it slide?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N is applied horizontally to a 2.0-kg mrkriee filamu28 ( 3(3ass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a em(3lf 2ikrru8 3(ie adistance 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 workijb*9 .)+l 0q/ukt) iav6oot+lq ypq j done by friction l9 k*.iqltv/ joopj +i uqa)y6)+tb0qis $-6.0 \times 10^{3} \; J$, 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 inclinei/c vb4m6.u0/a jj wmed plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200.j 64cwjbuem /v/ i0ma 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 ;c4p*qg6z, 83 (bj :tl(apuuqt ts kqvthe top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plal cpt*qb(3( qsvaq6:u, t8gjzt u4p;kne 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 10.90(v8jrc:qfau/ qb rfxim;k zt2 v87s0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it asvqci/q; ffv2r:j(mtka9x srz880 b u7 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 energytel7bfr9k9p,6w cs h+ when he runs up a flight of stairs 10.0-m high, i96 bt,slfh w +c7rep9kn
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 omxv; .qu2l*n fbject with a constant velocity of 5.0 m/s. What power must be delivered to the object by m fvn.x;ulq *2the 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 en/,;m;*vo:lsg)i/dl jz hcix7z sl, pkergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W,sil) d/x :lk cp, z; jsi/7g;lzhmvo*)

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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. Hj hfk;a)ui 5rkm4r8ey.2rw5low much force does her foot push with when she is travelingrel2w8 k; ufrk4r ).m5jh yi5a 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 0hcafosbx y xi/j.(;2 5 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 74sc(2xj h;ix 5bf./oya6 W)

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