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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 expresse ,4oua;, s5 jcnubc9xrd 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 ep*iu/k+ gxc f9) dle: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 amount of work8eas/(1v/ 0 pgt ogi:dpgku:p/ e 6bl;cz uti, yo gt6/vka:ei pg/lcibs t 1; gud/,:oepup0 z(8u do

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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 2.0vl5 v 6eg+uzv0 m vertically and is being held there. How much worg+evv v5l0zu6 k is 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 horizontalme/n ,mg*pi7iojyuo+q j g/99 ef5x:aly forward at a constant velocity carrying a 10-N object, the amount of work you do is *amo9gyfe/gxj:o qi 57 iemp/j+n,u9

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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 theng);m0- mdz yli returned to its original position. lgdm0zmiy- ;) If the total weight is 30 N, how much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting onec; *v-0zco5m wy4n vjxa;zu + 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 sig6.sow )o a3m;b)mpgg/xj)ly(,v jdhf n of the work done by gravity while the ball goes up with the sign 3sb)g,jf)h pjo)( v/w.;xmm6gdl a yo 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 Force versus position1q o2dzf-7i+hb hmj)h (F vs. x) graph, represents-fz1j2i q h7 +bod)hhm

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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), whkjpia:p 0s 4(.; slzmpat represents the work done by the forcej l. 0kmza:is;s4( ppp 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 positivej.giz-f(v)oatm y ) 1c, 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, then thsg3 x yq9,j+mc )lijvn81,trqe 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 the objenf(k c;mut03hct'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 aw1*)0 *ujqlh;zig2 3jp ni uvk car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to th pu j)k*0luv;j3izh1n 2 wqig*at 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 astjsk; *nmmn+ 7 car K, and car J has half the mass of car K. The kinetic energy oftjn 7*+ nsm;mk 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 i un;hul w)ow;;ts original speed. What is the ratioh;wuln ou;w ); 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 m/s and a pebble is moving at * wg1.w6uwtv; bat,1jr t4dmu a speed of 5 m/s. If bwwt. u,vwu jb1ttg6a;m14*droth 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 spe,l*d+ m)nekb ded 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encou*,kbd m)del +nnter 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 cvzzu.pxev b5c4s(hwl5x-q33 x 5ms. par in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidsu bm5.e(5 h xpz sz5vl q.pv3x4wcx-3ded, 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 mao-d0* 6-pw- tswn qsetss orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kine-n *esw-6 d 0pqwtost-tic 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 pria:; ghm08 daxi m1lde1nciple.
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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 ned ms+ 08r5v arqav(qds2y62o fz+dx7kgative 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 aboveq6avs+wz8uu2if6k7 kwd i 6;m the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to thud6qsivwk fu 628+k7 zw6am;ie 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 attachene6 hb: 8d9 yd3pd,srnd to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of ye ,d :6drnps8n b39hdthe 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 /j2lh 775 p dd7-uyu3wtsdbeqenergy 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 kinc).a ppo rn50t.lwq .jetic energy K, to its potential energyo50wa crn .l pp).tj.q 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 hil9n( ld1rlx 04 ft5naowl.

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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 equal s2zl+ln;rebd iul - y1jj5 iy5;peeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to+ld jyl; blj-;ei nu5r15 yi2z 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 opphd6*t:/ggql ,a 3u a7-cwi$m_{1}$ 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-xmbhq 2 +/glk3g8+msygf-mp conservative forces. h -gpgmqk32g8fmysm-/ blx++
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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 frictiohm n7llv4o.id4 ;h5i en is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to thioiml4.vn;7 h lde4h5e 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 kird/..7y4d4 r0;uf 8ucyojv.uv x fvfjnetic energy. Do not ignore air resistance. How much gravitationalj0 47y.c ryvd jfr;uo4u.v.v/ duff8x 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 gravitationvhmmuyy8 7ug30 r k)7eal potential energy. Do not ignore air resistance. How much kinetic energy did the ball gaig mu377ry0 )k8uhvyem n?

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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 ens //ss9w3 pyyigtu a-+ergy.
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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 ise- 9w a 6rta;kx,rt9bs

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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 gbm.psf3.wmam0 :dq2 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, whichq/q9f *geo:adl4 -oeo 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 vm6a 2 do2srp(time. To do so, your power output mod62(2 mpvrsa ust 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'w)l:q 5dgnc5 js 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 verticallynzk1-x e2r tr) 2.0 m and held there. If the object weighs 90 N, how much wo2xer1n rzk-) trk was done 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.n:ywvgl552.9ck ztpkzm1 p,n0 m, at a constant velocity of 0.50 m/s. What is z95v,5c kz1lkp2:t ngpmy w. nthe 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 constant force of 5500 N for a dis;9;qix: vsn nhs(cx;ltance of 50.0 m. What is t ;ns 9nvhlx qi;;:xcs(he work done by the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constahh9+tqe:2 e.uqfjqu4 nt force of 5500 N for a distance of 50.0 m. Whatt+eu9qq:h.h4ju eqf 2 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 constant force of 5500 )z.en+zmq0y yz3)vh au02mtoN for a distance of 50.0 m. What is the net work done on the elevazmy+on0 . yvz3mehut)q) a0z2tor?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6.0 m up along an0oysbqd+.;gipvt) : 0hu,o x $37^{\circ}$ 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 shme( s1:fef)mrr jhg1 ,v0l q;lides 8.0 m 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 sisterm cu-zxi1xuzz8n( 03i Sarah in a sled on an icy surface (assume no friction), wi0 u1mx(8 -iczziznx3uth a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of thezi. hs +hx,r(dvyq, r, force. The graph in Fig. 6-1 shows, (y.qszvrh hi+dr, ,x the force versus the object's position. Find the work done when the object moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the k ueqhya;zy 1u:,4jf2+em8ff direction of the force. The graph in Fig. 6-1 shows the force versus the object's u:h ,e 2 kya;mquf +fjf4zy81eposition. 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 graph i;tc:rrvw: ow+s swf jb9 v4 ).rzz,o:vn Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0srvt 9o f:os:;crrz:v. wvb4j z +w,)w 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 *z6t.yb 4d hpithe direction of the force. The graph in Fig. 6-1 shows the force versus the object's pos.*zty 4 6pdihbition. 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 4c avc.erth8-rest) across a 10 m level h-v4rac t 8ce.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 -q)v q,a9leo gN is applied to move a 55-kg cart (initially at rest) a9 g -l)q,aevoqcross a 10 m level surface. 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 m/s. Hobbyo )m:g5cteky j69 )p8y /vew much work is required to stop tho:j) etcyy m 8gv95e /by)6kpbe 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 moving vusu3(+kc ,mlxab*8 ltwz .(cat 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condition?, c3u (xvw mtks*( .bl+8lzcau

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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 propelh 8o,fo4sc a)pfb)jx8s 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, assumingxf)p,habo 48sjo8 )fc 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 fonmthb/ p xcf81 e.go n+x/9-component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. Whate gx-ftn9.// + pfo m1nbxcho8 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 ho 9,jty5s).cdyxd gd6rrizontally into a bale of hay, striking the hay with a velocity of 60 m/s. Ijt 9s,yg xydrd c.d65)t penetrates a depth of 20 cm before stopping. What is the 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 of 7.00 m abo u xufaf91w;cxs 7/d,ave a floor to a height of 13.0 m above the floor. What is the change axf u 7xu1,w/sfc;a9din 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 up an inclined plane. The plane is 4.0 m-ix8ja2y:m(s xrtz0k long and rises 2.0 xria jm:y02sk(-xz 8 tm. 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 sprind *-ms,uz8pcgo,u3 0 b0fsmn/ uvz)kmg, causes the spring to stretch 2.0 cm. What is the spring -s0,zgmu f*uzco8mskb03mn)v , u / pdconstant?

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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 const e/ax:91 ojkwwo9 yue8ant of 60 N/m. How much potential energy does it store, when stretched by 1.0 y/:ek9 u1 oow ej98wxacm?

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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 unc 6iarul*.lwy0rfc..o ompressed spring with a spring ri0 l co.*u6lw.f. yraconstant 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 s-j4eilgq *1e ;hls k-from x = 0.20 m to 0.25 m? (Assume the unstretched position is akle e; s*shl-ij14qg-t 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 initiall oj+agp i p. ,c(9tzhmce06vu,y compressed by 3.0 cm. How much work is required to compress the g tv(9 p.phac,j0e6m, zocu+i 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 a 50-m high slopen0b*w0fh* lcn 8r- hgc. What is the speed of the slier on reaching the bottom of the 0**0rfwbn c8n-hh lcg 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 aroi-iuk8q7ode e84 -z hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after d8ieoqro 8 kde7-4 iz-uropping 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 has c j*jltpxgkt zhpofi.)9 1/;:a speed of 9.80 m/s. What is the ver;1)p /htxlkgc:*ji pf ot .jz9tical height of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. Whenv6x9 ;x:g ktuy it is 0.70 m above the floor, its potential energy exactly equals i9yx:x6kvg;tu ts kinetic 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 kin2q9. bik9x *q v,kyepjetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To p2,vq.ixbk9y9* j qek 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 theny3f. j mrf)x z)ryq xw:5/7sw ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. Tow)y.r:q sx rf x53ymwf7z/ )jn 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 re5d:;ki e9sennst at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rol 9e:5nes d;kinler 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 stah 6v qe3d,8aesrts with a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above theve 38,adeh6sq 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 l6z4dp3jry8gg6 )fu ou,hvb i v6,4xja 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 the speed of the roller coaster at the top of the next slope, which is ur oji 38bx ,ljudpg yf6zg,4vv66h4) 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the baldkn.c/lmi .u mj 7*+zql 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 ti gb w(rqzqp nrfu5/0 9gqagga7d,;0;he vertical axis and released ;zg qfd;/a0(uq5pgag ,79w gr0bnrqifrom 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 in0l 8yu//gm: ibpbho.e itially uncompressed horizontal spring withgpi/oem8y .bh u b:/l0 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/s, slows/ddv uvm (,hp6hy jg6:ug 5x1i down her 2000 kg car to stop for a red light. What work is done by the friction force against the wheels?, gx1(m udpu6 jghi h5y6d:vv/

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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 a79q*z tosf+rq+8l4q nlg i* xy horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it sf+nqg9l4 y z**xrti8loq sq+7lide 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 69xq to1d)hk.rhd b9 rrough, level surface. It has 24 J of kinetic energy. The friction force on it is a consta rhdh9)dt9q61. krxbont 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 mass on a level surface. T;del0x;eu0 wzhe coefficient of kinetic friction between the ze;;e0d u 0wxlmass and the surface is 0.20. If the mass 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 topo k1ag l)cjtidz3/(, v of a 50-m high slope. If the work done b )iv a/,kzld (gct3o1jy friction 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 v:/bc0hc,db 3f7wk ji 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 the magnitude of the average friction force:wbd,7iv/j0 hf3 cbkc 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 aryb7k 4r-oy1cx*jywuz* ;fi4 plane inclined at 20e above horizontal. The kzx1w b4if;*yy4y rjru -oc* 7coefficient 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 a height of 16ezikqp3wg z ( (f:h;p0.0 m, and strikes the ground with a velocity of zk: wiz (63ef(pphqg; 7.00 m/s. What average force of air friction acts on it as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energyyh0 z ko4r:e exlp+4v6 when he runs up a flight of stairs 10.0-my 6e:k0h pzx4oerv l+4 high, 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 o(d rgs96 ua,xw s4rmf*vi,t-constant velocity of 5.0 m/s. What x,6ri gs9vu*fr, 4- mwos(dat power must 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 that runs forkth d/a 9ag/);khpvtj ):a:pz 1.0 hr? (1 hp = 7p tjtk:vaak/d/ ahp :g;h9) z)46 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 hlo4tc2)5d mc- kq* xqthe rate of 500 W while riding. How much force does her foot push with when sh2x tkcc *d )mh54qolq-e is traveling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average powey t 4+xub520 nh rmrkje2lha2+r delivered by thbrn+tmry02jl xe 25k4h+u2 ahe engine? (1 hp = 746 W)

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