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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 ex/rbo8 c :7mnb9ml6r vkt tyt+9pressed 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 w7pl n04d:r wy/ul8cq a system 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 amo ykk)h:rh) 7rhunt of work you kh:hhy)r)rk7 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 liftcs:643 /d1sbarb n isced 2.0 m vertically and is being held there. How much work is n/c:bs6 a134i sdsrbc being done in holding the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocity carrying a 10-Ngccu 8n *(6k2 xoz0era ks 6e,hm:o6jn object, om60 nhakre8ucc2osz :*k6g,(n6x ejthe 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 lifted vertically 3.0 m then returned tos8q+gx 3*kisne(l)cdl2ys7*s /j eq v its original position. If the total weight is 30 N, how/s *lgyl sc 3xqvks 2ne8(de7j+*si)q 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 object do wze* q4 .x s6q6:rkivpyork 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)bo uzml q1)vtjo x,b 56;lsx4 of the work done by gravity while the ball goe4mvjlbq5 t1; 6))oboulszx x, s up with the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a For ;*bp h(ps,fb l/zv2nrce versus position (F vs. x) graph, represents;zpl*bhfrbn/2(v p ,s

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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 represents the work done by zt6 r1b 3cmpffa7:aay;cd+wm7; st . sthe for.+67c fasmtfb;3zd; rs1a:p yawt7m cce 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 ,o.bs74sh wyathe 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 the object's kin2 4so4(osv3rq g uxay:etic 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 object's kinetic xan- d5ql,4jbon8aw) 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,6zbyj5 akzvn8 m.l80a and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to thavj.6ya5b8n8m az0 lk zt 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 fakufr; 3b:,g zi uy4;kist as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to car;:iif ykb4r;ku g,3zu 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 bac3zvza0bb0 x 7j:yzb7o k with half of its original speed. What is the ratio of the fiz vbz 0zyb03j:x77abonal 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 a speed of 5 m/sh6)y0yrbeu;-hyr, dhy aef2.5; xio t . If both objects have the same kinetic energy, what is the ratio of the brick's mass to the roc, if2eh xy;6h. h05a;o)by-eyd rtyurk'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 z,g /ocinf2mp +;1vwbm/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force,n1;/wob gzmf,i p +2vc 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, vns*vua6.:0tglc1vhnjd-0 qyee -r/ and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what diav eh00n. cvq1l6* sjt ye/v:gn du-r-stance 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 elliptican+ob3 2h7rlg1/gv qtdl orbit. Neglecting any friction effects, what happens to the planet's kinetin r7 l321hdo qg/tv+bgc 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 pri e5ldqu n pmw+5()n .tjl4j1mknciple.
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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 systz q-0w9u ki7t(orn ejr z91ka;em to 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 objtcan36j gu. z(uqvbxm 3-bu8)ect with four times the mass of the first if released from the same height. The pote 38 q) uc.mutu (bbjx3vg-z6nantial 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. If gts9m ii(wy2nx ;00w panother 0.200-kg masig(m9tw0 xn;p 2s yw0is 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 enhek z:3tg5(*m lwa .dnergy 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. Compu8x5lh+t)5 vquy6a4gsu zc )sare its kinetic energy K, to its potential energy y6ls4sc+zhva5 u)u5q8xu)g t 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 cn,,:o)3cl fuoq4kgg 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 object are sliding with equal spdg+ 7 n a7,jpiw9tz(lieeds along a level frictionless surface. They both slide up the same frictionless hzn+,p79 idaj iw g(l7till. 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 5kr(0m 4xldhe89 7f5wrskw ueh7jc *b$m_{1}$ 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 mechaimfmxrj4. cvn9r d e 5e,vedr:1y5f98 nical energy for conservative forcesdcf5rve 5 xm9irefnyj.18dme49vr ,: .
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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 q h.14vvdtl g3g me 6z9wath26present), to the ground below. How does the kinetic energy (K) jus.1 ewvla3tmgdthqz92v6 g46ht 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 ofz(mtc *5 ,wvyt kinetic energy. Do not ignore air resistance. How much gravitational(5t wcyz*,t vm 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 gravitational pote*;te6adv5zu -si;memj lv( 9w ntial energy. Do n 5ai;tmz6evl uwv*(mj;d-se9 ot ignore air resistance. 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 conser-.m pn8ni ,, h(a,pn/elsu zhsvation 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* 3n/e is/,wzrbt*spa

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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 ddtijdi(/1 o. 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 poweryv2 gjw;; wokn7yd8sl68*r-6og* aw0lzpmvg?

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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 timel6v,j phfv-6gs the work in one-third the time. To do so, your powerjvf, 6-l6v gph 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 enginew: /l 5d9llhk( zzfxds/4idx0 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 4seb*+8 p+zb)ki2qzso 4a rj u ;ht/nb2.0 m and held there. If the object weighs 90 N, how mq48 sz +sah r ;eu )tb2nbzi4k/*p+ojbuch work 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 physi*p/1+0kyk3hh7a7z z mf gehb kejdd03u+q4sdcs book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done b4 3h 71f+3qk7a zj0 ueedhg/ pkh0sm*b d+ydkzy 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 cos d*mw(s2ef/xnstant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N f dw sx(/m*se2force?

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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 withv bgkn 1m)u:9n a constant force of 5500 N for a distance of 50.0 m. What isg vun1)k mb:n9 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 kb rv9xgnx m -u/)k9nkk5 ha**5500 N for a distance of 50.0 m. What is the net woh5ux* xk)-knnkrk9/ m av9b*g rk 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 6k)gbc p de1urne n3)d 6*9261bvnjzih.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 slosag.9 1eun/a ph dm9j b7g.0lides 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 sister Sarah in a s v39z: 8el 2,h:qeexi,xhplrebq,yt8led on an icy surface (assume no friction), with a force of 60.0 N at an anret pql2xv8:z,ee8by:9l3 eq, ih , xhgle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig.q,j(f zpr ya+w0a2 0rgcxlc /9 6-1 shows the force versus the object's position. Find the worg(2 jr a0zfp,qwrx /+lac yc90k 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 force. The grapp1).nd- )rfap8ef rq2pio p;oci3v ( sh in Fig. 6-1 shows the force versus the object's poso1e-sod fcnr.pi f)v2q ia r8pp)(;p3ition. 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 n s;rt/+z hnv)s-j3tn graph in Fig. 6-1 shows the force versus the object's position. Find the w;n)n3+zj-hsnvst /rt ork 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 gral * 1 ur*kx//q pqq*sbm3tzi5eph in Fig. 6-1 shows the force versus the object's position. xleqpk1sq*t q m*ibz r/3 /u*5 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 rel*0y 4t (bouwust) across a 10 m level surface l*(0otu uyb4w. 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 ca.no bd hxzoa,tahuptj*;3, tl0 b u03;rt (initially at rest) across a 10 m level d;*tpb0hu. hx,3l ztu0;o ton ,jb3 aasurface. 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. How much work is requi .u*ebn2ip. nared to stoe.*a bi.2npun p the 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 at 25 m/s, what distance i;dlz l5 (hiomchu:w2(s required to stop a car mo 5hh ;ll (ozcdw2:imu(ving 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 propelyq35a)tiwgh(sbf + x;lc 12 +z wvvl-fs 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 th vs(5lfww+)v- b2 ft1i;lzxqhy gac3+e 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 6jl gvky.48tde vr.w -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. What is the cart's final kineg4w -jy v.r kv8l.td6etic 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 haipewga.;8ul;2znfj.r z5 q. 7rjcq .ag)e-l ny, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping forcnz.za en.j5lq;) wgcl-jiefqau .p27 8. r;gre 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 to a heighj9s8h/yu jq jk-jqv::t of 13.0 m above the floor. What is / hjk 8q- suq:j9:yjjvthe change in gravitational potential energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plane. The plane is )tqimb:2v j9 h)zh2fz 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work2qj9i)v h zhf mz2)bt: 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 sprin9f d(gg8.yz0vw-3z.dz kji tr g, causes the spring to stretch 2.0 cm. What is the sp-(8dgk0.fjiztygv9 d3wz z r. ring 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 constant of 60 mry1a gls-,2iN/m. How much potential energy does it store, when stretched by 1.0 iar,-2s m1lgy cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initia/yl ;nhkkt 3q1lly uncompressed spring with a spring constant of 25 N/m byly/h3;1k ntkq 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 =4o5pvt(rnsvx( p2q( wk) m,mlgx6 9 gp 0.20 m to 0.25 m? (Assume the unstretcp9x gwsrntvv,2op( l 6(k5mxp) mg4q(hed 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 con5hci-jz v n 1fls879iustant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the sp7 cvlni 18iuhzj9s5-f 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 high8w1;vfc ;ddic3zgpwb6nkbfa(* vj5+ slope. What is the speed of the slier on reaching the bottom of thecawd;n(1bjc ;3 8zip* kv+5dgvf6 wfb 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 pv:/d6bxv t0hnj( k+tkg, 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 t +b:k xt v6/0(jhpdnvdropping 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 frxo j, 6qu-l nvvbk4 *7kf(iq3pictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the ver(nkk6-q 3lj ibv4f *vqpo,x u7tical 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. When it is 0.70 m a1j . +kvhjapw*;km2;x3rgcjibove the floor, its potential energy exactly equals its kinet kjp+rjj1k;;a 3h gc xi2m*wv.ic 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 ad h;:)otu/ wu*zapg*h kinetic energy of 40 a*d:;u*h ohz)t/p w ugJ. 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 leavrjvx,y/p z wusk -9f+gy1k3g) ffkz.-es the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it ris vk1r3fg-w 9j+p,f ugsy/zx-.ykf k)ze?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above the bottom of a dip q4axfcuf0:4xwxmc 1+(See Fig. 6-2). Neglect friction, whatqcw+xa 4cx xf1u fm:40 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 of 5.0 m/s at a point 45 m above the bottox )bwrf/ muaqw1hg90sg ,2cv:m of a dip (xqs,:/wg u 2hrvg0baw)mfc9 1 See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of 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 bottomiu /qug6hz4ba,p u2eb2)d1nf5 bm2gv of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the ru4bnb 21efm6,q25p2g a vhg)/izduuboller 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 speedj -b/w 6g6(jnwkdhps 2 of the ball 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 fr: 6 9dbrh60 l+eu,brv xh7gb1h fuxk 5qnms4y,om the vertical axis and released from rest. What will be its speed at+nkb6g4: 5r,dl hb0r 6, 17ushx 9yfqxvhembu 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 uncompressed h ly1/b3pty *e56g3usx ezqe /xorizontal spring with spring c/e z16y3gq5/ u3 *yxl xpbseteonstant 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 for a red lf xkl0,qs6 rk 054rhjeight. What wo e5ksxfq6kr0l4 rh,0 jrk 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 horizontal sur3jyjzem0gmf +,rm;dn 6 1kl4nface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it sl 1ym0jdm6nj ge,n 4;3kzl fr+mide 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 o .8bu30w eciu wv,)al0yd k.drn a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0u0dyc ku), .v3.w rlai80eb dw.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 azrful(7j zg16+q g:mz 8 e:zwqpplied horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass e:z(zzw1q+l fgr8 6:uj7qzmgand 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 top of a 50-m high slope.r0m yexlu290 l If the work done by friction 0lly29mu ex0r 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 aif2a ,ile. 5qfn 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 planeq.f afe i,5l2i. 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 resvkxbo 0)g.e+ rt at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass aftkvgbx0re. +)oer 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 ;ueyfz+)4m j aa height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air4ufj)ymz +ae; 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-hydb;1koqf/ j *5 2efykg boy using energy when he runs up a flight of stairs 10.hb5;o2ed ykyj * f/q1f0-m 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 q:i mz8+d .qxdry,wh ;constant velocity of 5.0 m/s. Whad,x .i+h qd8wryq :;mzt 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 fw2fxrah7n59zxk oi1 r0yhc9) or 1.0 hr? (1 hpi0hza9r9)ynx7 f 2 wo5hck1rx = 746 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 does v .3l;j:qjizp zfzz1, her foot push with when she is tralf vj.3qp 1z j,iz;z:zveling 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. ccj2 :7b-whgwpbb6 -s/rkq/s What is the average power delivqbswh7bp:-wsg/ 6 j-cb2rck / ered by the engine? (1 hp = 746 W)

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