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习题练习:Physics Unit6: Work and Energy



 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 +6 /vg y-toppsc)nul)p- (wuyunit of work expressed 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 sx-gne .a(t2a8u/ cs o uh0x1qaystem 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 amount of wsir:yp-5ij g6z5xr/b ork your szbj ii-5pygxr:/65 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 liftez;*)h/. 4ucco tn8 luph y8wcjd 2.0 m vertically and is being held there. How much work is being done in holding the box in thish ph*)/8cy;c jcut wou8.znl4 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 ai8cbym i7 xt 2y08 heb:w6:lhzt a constant velocity carrying a 10-N obh7lii8bxy 8y :wmhc b2e0t: z6ject, the 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 returnb qg1iz(r8g.ned to its original position. If the total weighg1(rbqn ig.8z t 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 on an object do work oytg +,gnijcwb8ftk7l2q5q ,5 n 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 done by gr3us0rynn,e ct) na8u9avity while the ball goes up wisrc nnau9e38 uy0)n ,tth 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 Force versus position (F vs. x) graph, r rwg. jh-je:a-epresentsjg.-:eaj - wrh

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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 veq u0ut2,;u *m2upnf+hc3 9ka8mmi+gty znd9lrsus position (F vs. x), what represents the work done by the force 2gfln0*c98uim,9+ ;amduk qtnmuh +zypt 2u3F?

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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 isvorxv7+jj * ;bshs+0m positive, 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 the object's kinetic sojii+a+i0lshz *56v9:iknf 0 d ge,r 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. c-1cw2uc.g6c)y.z+r: ht sj bnfu hr 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 as much b69 ,abywu du1nr:w t8p/,yfv d6q6evas a car, and is moving at twice the speed of the car. Which statement is true about the truck'u n9dyb1/66tr,va8bpy:6wdw e vu q,f 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 :6,a bneo5isw has half the mass of car K. The kinetic energy of car J, compared to car Kie,5s 6nabw:o is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its original speed. Wrns 7t .6ujtj.hat is the ration6t.. su7jrtj 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 pebblee .sw:7mwr wv3 icao1oa)0h.m is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rocko0m w mc hr1v wswoe7a.3:).ia'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 ee4dlqmx ps9 cr 46-wuq l:44qyfm)d n47l a1t2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance-ma67p: qecsn4t 9 udx)few4 4lrm4ql yld4q 1 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 certain distagpw6 e au:j2v4w nu/rhfz)-7znce on a straight, level road. If you had behzne: r)64/j uz-g7vw2uaf pwen 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 elliptical orbit. Neglecting anyrxz96 r(qnu 6tye/vf6 friction effects, what hapq xrf 9(yeutnv 6z/6r6pens 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-energyk /k :h i9f531*ilq)srrjyeuk principle.
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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 smw-54jvvo. l4nl gk 4 ak1nb/system 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 axhnru 1kn 1r;.p 0;e2vmud)jm height h above 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 obdj0 hr)mme;k2r1v1pnnuu ; x. ject 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. fqx d2uijz9) :xvo: z)If another 0.200-kg mass is added to the spring, the potui zx 92:fq) )jvxod:zential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy oix vcfw+in ,28f 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 y8 yg ziq-0trlx+f5iyw d:b85bhu y:t ;oyk54a tree. Compare its kinetic energy K, to its potential energy i ;yy+tg:qb8-5ditrl0okz5 hy4: f 8u5xybwyU.

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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 hilldfb; wdk7w2 ,u (wte ;xhdk rw:te8-g-.

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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 sp .4r)lta4dtoxexqi,(iwf:/r eeds along a level frictionless surface. They both slide up the same frictionless hill. Which l .)rdtoir4 t:ew4 ixxaq(f/, 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 /w.pjizc9 x,dpz)+im$m_{1}$ 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 mev6m ::hv-hl7 7gbw ,:m+pemezrzq y:nchanical energy for conservative forcesgbw6,y-mv:z::vhn e:7hr eq7pz l m+m .
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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/x::lvf(o hmu is present), to the ground below. How does the kmv(uf hl:o:/xinetic 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 eneeoqfa5lchh/4(h z w +1g l7:uergy. Do not ignore air resistance. h/:4lh5gwof7 q+a cu(eh1 lez How much gravitational 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 poten5ez 208bywlu9* q xyfytial energy. Do not ignore air resista0 bq5*2xzyfey98wuy lnce. 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 conservation of e *o1f2 v wxuqoo-(6pgdhr :/munergy.
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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 is9(6mew hrjv1 j/i 9ggi

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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 expressedwj)sh+k z.nb6/+i 0 pdvc5q wd 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 uni p m6tz5rcj79mt 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 time. oe (- czi9gdo.i0n8 jun9 ei/gTo do so, your power oj ignno9 e/z8u(0iocig9.-de utput 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 0 z1xvtp:hu8i*38j y 1:ogjq wyomb y6acceleration, 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 there. zq6h4o svu6 1bIf the object weighs 90 N, how much work was done in hu4 obq6zv s16lifting 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,,n rfm8 dxi3q the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the i3dr n,x ,mq8fweight 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 dist eo9o*dy8ikv bpv5c-6 ance of eokvb-c p6*iov9yd 5850.0 m. What is the 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 up27pw e;5z7 tzb odrdz*ward with a constant force of 5500 N for a distance of 50.0 m. What itdbp zz7e2 zd5;owr7 *s 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 wit/fdz6m4iz* bhh a constant force of 5500 N for a distance of 50.0 m. What is the net work done6d/hmbi4z* zf 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 8x1/r 1n upsjaf,t3zf 6.0 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 d4ou7njz( w k-8 r a*3faeume.nown 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 sled on an icy surfau295ie /earx)171yco)td4g oy elmchce (assume no friction), with au 4)ee 5do9t2xaycoig 71y h)1/ lrmce 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 direxm 6:5lqoy0 ihction of the force. The graph in Fig. 6-1 shows the force ve xm5l6h y:oqi0rsus 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 direction of the force. The graph inw jwfiz)*r 2z,q;u dt)a xt(3o Fig. 6-1 shows the force verad3wx;z*t)q jr owz2 (utif),sus the object's position. 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 in Fi 9e84czfa hg+pqd2rc- g. 6-1 shows the force versus the object's posr8ch c-2 4dgp9fa+ez qition. 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 in Fig. 6c/ cd*fdhm *3q-1 shows the force versus the object's position. f/ch d3d **qcmFind 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 (initial ni81jj6gsb(f ly at rest) across aj jgi(b1 f8ns6 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 h p/9g7c1agvp to move a 55-kg cart (initially at rest) across a 10 m level surfac a p1vg/h79gpce. 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 workeb /:lxqbg61d( zrnjj de)yl+4lfo0 - is required to stop zxlneb 1b j+l ye -gd4jrd:o q0)l/(f6the 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 is reolv :,eld3ov 4quired to stop a car moving e: v l4,d3oovlat 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 10lj(7tj v8w.c /ku9;dvqx)j( cp0kidg -g dart. It is cocked by exerting a force of 20 pj8d gjw (tqk7 i0cc( ;j/v)l 9xd.vukN over a distance of 5.0 cm. With what speed will the 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 ofys0 n)lpi.iwae8j-jda +(: 6ti mh i)y 60 N. The force is ap it+-wsp0 ae8hyli jndj.m(6i) )ya:iplied 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 g is shot:s0hqmiz 6*o2kgg 9p fpu j 74(k/pivc horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before s9j/i*6zik0uqh p2p sfc gmv7k 4pg(: otopping. 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 heif vrmnqe,*h4 *ght of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potentiv n h*4mf,qe*ral 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 planer :fd ou8(t6tg is 4.0 m long and rises 2.0 m. If the plane is frictionl ftgtdru6:o8 (ess, 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 :zxu0 t8 p gu n,p0h.(pt3rnckrln+9wa spring, causes the spring to stretch 2.0 cm. What is the spring0x n (t3cn9t+l :n, wk0u ruzgprpph8. 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 characterized27sfi ;1wnc da by a spring constant of 60 N/m. How much potential energy does;1a ifnc7swd2 it store, when stretched by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompressed sprvgf+u, ud8; kling with a spring constant ofg v,; k+du8ufl 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 4wkmazpq5 iaa /b*lt)gq129i(0 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched po2z1ak(*5ltpa qbiqga9w m/)isition 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 constant of 15 N/m is initially comprt/e4 e +hfb h9iawhtlc-,kb0nx:.d.aessed by 3.0 cm. How much work is required to compress the spring an additional 4.w.:xe4nb0b-hc9,li.d e f hkth+t / aa0 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 toppml 5mjnrw 67b2tj+)t of a 50-m high slope. What is the speed of the skier on reaching the bottom of the slope? ( 7lbt)mjj2p m56tw+ nrneglect 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 i- y::x/v svea*:l gcrku cc6:kg, pushes off the top of a hill with an initial speed of 4.0 m/s. Negle*y :::krs vcu /i:egx- ccval6cting 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 inclined plane. At the e ) 3guh+e9frfw.xwy*u7* glebottom, it has a speed of 9.80 m/s. What f.+ew3xyweg7r**uhfe u )l g9is the vertical 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 above the fviun2 5xl1.mqb(up h.loor, its potential energy exactly equals its kinetic eneq5n.21.pib hxlv mu(urgy. 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 * n6mor-0vsx1wa8zxu from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanicals1n6u- ar8x*x0wvm z o 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 ground with a kinetic ener0e+a4bylszgg*tg+a ( it/,k)u ih(4nh a3 t mtgy of 220 J. At the highest point in its trajectory, its kinetic energy isslyi3,0h )*b t/(t uzam 4a+ghk+etigg(tan4 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 a point 45 m above the bottom of ag ps msn4dw( lvj(v*- i,0o+cl 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 the bottom of thel4dwc vop(g+l0 - s*ijmvn(s, 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 8gkm.ns b. y r o -:6y/jh*;t+pfhjtxx45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will besy b8k jjt+:nhp-*rxm ;tg/6 oh..fyx 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 ahtm u.fn 5ju4jln+ s(zo8iz 45t a 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, whif4n5i5shu8ulz tm jz+ n4.( ojch is 45 m above the bottom of the dip?


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78#
 
  What is the minimum sp(xoq 6h p(o qlxzzz)r83sn,k(eed 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 2-kg pendulum of length 50 cm is pulled 0.18 m away from the vertical4whpub xk+ ,n) axis and releanb +h)pxw,k4used from 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 initially uncompressed horior imwsg)1sv/,r52d cq nbm83 (wfp5pzontal spring with spring c5 fw, rv2/ip 85grn31odss( )qcbw mpmonstant 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 h9q s5yx22te eo( mjtg7er 2000 kg car to stop for a red light. What work is done by the friction force against 2o5gm2t eyteqjx7(9s 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-zz uqz7a 2l0 5uv93:hesy k:axkg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/sqxykev0 5zz:ush zaa793l :2u , 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, w0de tiwy3f7 on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant eiw7 w3yt df0,0.50 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 o .0k,p+tty lnb oy0o:/3cyjucn a level surface. The coefficient of yytc. k py/j,ot+n:oubl 003ckinetic 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 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 p n fa+f 427:ug+v ahuxfwrb0*a 50-m high slope. If the work donu+u+ 2n b4f frfwx hp:0a*gav7e by 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 4h r*/i x8knaainclined 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 wasan8 ha*/ir4kx 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 fr: -vabo)izz-wt q;7lizvno 71om rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction betweenq-vt:lw)z-i; nzv1a b zi 77oo 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 topi6u1uq7l l :oy//l height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average fory 6 :oulq//o1tul lip7ce 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 runs up a flight of s3t4a dq+a n7estairs 10.0+daes qa 47t3n-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 constanq5 l3wtyb4 .lcd25rlrt velocity of 5.0 m/s. What power must be delivered to the object bly5 cbt54r rq.23llwdy 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 energai2jo4tcl1: +k:t epty are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W)2lj :14o+tk cpt et:ia

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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 forcepz c;cw/,/ xjbfll46t does her foot push with when she is traw lcljp/4b/z cxf;t,6veling 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 thjvx enbl8iy*0li,-j.e6 z y l*e average power delivered by the engine? (1 hibly8,y*6i-lne .v*e0 zlxjj p = 746 W)

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