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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 expreg3 1 t, ba24-l0wndz/nmz mwrgw6 oai+ssed 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 ther x(sjddwdyo m(:93 kh,e 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 work yo.d ww ,odtpp**uw*pw,*td dp. o 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 2.0 m vertically and is being helu:bruv.* 6boyd there. How much work is being done in :uy 6ru*bb o.vholding 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 ho(j hiu,-nzj 6hjxy5x0rizontally forward at a constant velocity carrying a 10-N object, the0 jy5(jxn6ziu xh-h,j 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 to its origin*a f:/6 j2yf0ntwlccial position. If the total weight is 30 N, how much work yw2fc:a* ncl ij0f6 t/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 bt*s)k+a2w exa3g :7ua4y9h6h pjrpwdo work on the object?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the work dn *.+gap dcvtv7yr9 (vone by gravity while the ball goes up with the sign of the *7vt+9dgnarvp y. vc(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 posit soi2;.oe9 htllai1e,p si.e7wov0(iion (F vs. x) graph, represents7.0ist2av ,l io o(o;isp e l.heiew91

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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 (* j/j5wt+j nstF vs. x), what represents the work done by the force F?wjj/+tns*t 5j

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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 kux 505ke-yf,wme( ju 2qap m9 ndd7m/hinetic 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 energu b9oncih 1i8ux7g9 f:0m n/bgy

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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 kinetizri)9*iwuvofn vc1. 1t3 q)n xc energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is moving at twice them(cyf8s +o hfo6ht7 j. speed of the car. Which statement is true about thecs .fo h7 fj8myh6o(t+ truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of qs-9j r 2ygpgfc06 v460bj gsfcar K. The k 4rp g9gcsvy-6 ffj0b62g0sqjinetic 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 bounc,. w3 .um4(cys cd owu;6euqkqes back with half of its original speed. What is thkq.w3cu;mu wd6equo(y. 4 cs ,e ratio 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 o fjj amyey9: 8e7jl+7pf 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is th7j lypma j7+:9 8fejeye 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 speed 2.0 m/s. A 1.0-kg mass is moving w83bsepar(g n 8*yfz:r ith speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travep bgr*y88a:(zrn3s efls 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* k qhzfi;)j4 5feto7c your car in a panic, and skid a certain distance on a straight, level road. If you had been travelin) f; 5ote h*7icfz4kjqg 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 n e;)p6i5g9nkrgn80ru) vyjq an elliptical orbit. Neglecting any friction effects, what happens to the planet's ki;6vnprn u9g850k) yq)jgiernnetic 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 pr7;ehh-lsd +1qspe09pzx,n .nox obs7inciple.
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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 sy2jbhtw bx 6(,astem 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 , 4dsl,6nh3sv+ v zzn3 -kdtzzheight 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 objectn l, zvss6,h+4z33 vdkz-n tzd 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 stretovr 8t:hpg+o4t.:f oo, 7z8igpk yr0hch 5.0 cm. If another 0.200-kg mass is added to the spring, the pk884ohg 0r+r,o:vi7 y zp ftthp.go o:otential 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 energys0hx+yi r;kqxeideh:2 ((os2 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 kinetic l4p3mehik xn a; t*u;2energy K, to its potential energ *eupmkhi2;4 t3 x;lany 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 aw :4mr s(uek1s 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 he+zdd-((fv 5f8b es iscavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hillie c z(8s5d+(vffsd b-. 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 ui( ++;urnh 5;wmcig q$m_{1}$ 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 energ6 i0* lar lm;jctgz5(dy for conservative forcesr(lz6a mj*i05cd ;lgt.
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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 tycgigw 9p ,2my8plpb */-q ip1bat3;ohe air (air friction is present), to the ground below. How does the kinetic ener3g, bwyc/1oy qamp9 pl ;2bg-8p tp*iigy (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 gai2dnp5 (i.7, gxcz pfzvoiy+0u ns 30 J of kinetic energy. Do not ignore air resistance. Howz (7cf+ dvy5o i.ix,np 20puzg 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 potenkw agx16 + q)rbw*6wgotial energy. Do not ignore air resistance. How much kinetic ener+r1wga k)x6ww6qo*b ggy 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 conj ikgwa:,. : izwt/i*uservation 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 isqs,h+3c qs)o2 ..syv qsa/ xxe

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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 in SI us*r au0bd/h x(nits?

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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 hn8 gh9m:jwm1unit 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. To a54z oc*bu +vn. n1zbwdo so, your power outwo cz z4b1+ a*n.b5uvnput 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 engitw 3go7u11t4 ifoa 7mbos3;s fne 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. ) jm(t /n3boaz If the object weighs 90 N, how/( zn3m tjob)a much 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 physics book up in the air a distance of 1.0 m, 1v er yz;70f7y ebckgje 1ov535y+hvbat a constant velocity of 0k+eveo 71cygjr bfe ;1vv0y b753y 5hz.50 m/s. What is the 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 +2d,hdj bpi 2q 5fs xg+qmk1 83xhyud;pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is theb28qg yd,m 1+id+xpd32h5xuk; sqfjh 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 constantx, zotk p.*i 5.ayz0hefmm+i- force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the*mx-5ht.ap ,zi y+oi.kfez0 m 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 upwardcw:;4*h+7l iirkt wkw with a constant force of 5500 N for a distance of 50.0 m. w:+tci *7;l h w4kwkriWhat is the net work done on the elevator?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6.0 m up along pn7h,6.lp e aef*y4lw 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, inclined at(rz-y, cfwyx1+45no xf .muxt $30^{\circ}$ 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 s xts87 iw+e3yi:r/ unqurface (assume no friction), with a force of 60.0 ewrq8t+ ix:i/ny3u7sN 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 thewcxulk0/vihe,5 l ;d8m2 uj0l force. The graph in Fig. 6-1 shows the force versus the objechm icwd,ul082u velk/;0x5jl t'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 forb n ,ndsh4i7:7h;8lxssd yx)qrgg5t2 h d;(mp ce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done tshydhs82( gl7n4xdipqx;d:g,57b) h mrn;s 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 grat/1r /r cb yku-54/yulm2ovf nph in Fig. 6-1 shows the force versus uk/b-u4rt m 5frn2yv/ l1y/oc the object's position. Find the work done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. k*15ltlvcbu+1nlca/)jfa y3u6w t:g6-1 shows the force versus the object's position. Find the work 3wntu+gjbltyu c:lc1f15v* alk/ a6) 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 ap3vx5 cvyb*,jl plied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic 5xvv3,cylb j *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 (initially at rest) bgc (tu)kc8a 9c93 pgjacross a 10 m level surface. What is the fina gp8 )9jc(kc tgcu39bal 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 wrva04k8: 1votef +rh6 jjwx2. How much work is required to stop the ma10xrfte+wj8aovr v 2k6w4jh :ss?

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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 stopjidu cx w84mnl5 d+p2; a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s undd j4xd;p +u8nc ilm2w5er 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 cock8za *y45kelfm+.wz fzop) *kyed by exerting a force of 20 f5a l +y.kfpw k* yz48o*zzm)eN 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 coxh 3tkoa/ h.,c:+;lkufux g ;fmponent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionle; hfok /.ac3u ftxglux:+h,; kss 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 5f v h820zdec nwh)3rgo+mq(q shot horizontally into a bale of hay, striking the hay with a 8eozh0frh3 5n(g +)cw dqq2mv velocity of 60 m/s. It 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 above a floor to a height o97:srtukybimtk 6- w2f 13.0 m above the floor. What is the change in grai6y 7 ubrwk2-9tstmk:vitational 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 plq;du kx v1ut:mw33ttrz+t/k(u0+ ely ane. The plane is 4.0 m long and rises 2.0 m. If the plane is frimkd euu 3 t++r; u:(/ wqtz0kyxtt1vl3ctionless, 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 spring, causes the spring to str.1e)csmo p6+km aut/xb qp- 3j5mz2jw etch 2.0 cm. What is the spring conq o1cmsjj wz)+.utmm- a5kx3e6b /p2p stant?

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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 N/m. How much (s 7,aa6k psk) u7mbsupotential energy does it store, pa) ms,7u subksk7 6(awhen 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 compr(7moe i9lwqno ws 7vvo.ou:2+ess an initially uncompressed spring with a spring constant of niv+lv9meo2 u7.swow oo:7q(25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of spring constant 40 N/m from nl2ffwx; 8 p18-byqse;t*h bnx = 0.20 m to 0.25 m? (Assume the unstes b 8y ;bf-8nltp2 fqx*w1n;hretched 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 constant of 15 N/m is initially compresix dk)z.p)sri(*n h/ xh nz6i6sed by 3.0 cm. How much work is required to compress h/xi i .p6r nxd*is z6)hnk)z(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 starts fr u6vf *au,i8bm(yl wzn7vor:-om rest from the top of a 50-m high slope. What is the speed of the slier o6y(*bawzn: mor8i uvu7-v,l f n reaching the bottom of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a hill with an initia,xmj 1k/vbo0-vz/ze yl speed of 4.0 m/s. Neglecting friction, how fb/e - ,yj01kmzv /zvoxast 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 plaqk),n(n3tjn y c (wgg7cxxn 75ne. At the bottom, it has a speed of 9.80 m/s. What ixng,7 cwjx( k cng5t73q)n(n ys 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 0.70wqnzh6hp/-d (7v5 ockctx + +f m above the floor, its potential energy exactly equals its kinh-qhdc6/( 75+kxcwf zv+pnotetic 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 straightk 7ed uu6+h0lin xw-w8 up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanicaux6w8 kwn0 ud7+-il ehl 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 ther 9b6wz mprfv4lh c0)8 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, relatipw)rh0 c 8vmrl z6f94bve 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 rpf2 2i+hj2up im3p) a vyvnja+40dvo8est 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 hdmvpy3 fi 2 0viu ovajp)nj2a++p248m 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 bot. az0m6ydt:gjc i6ol-tom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rolg -0zo 6jc:6y tima.dller 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 poihe3ej 4eco/ x ;.jt/utumkf1( nt 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what wijmx.tek;3(e14j/t o/huecfu ll be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the botd- rbq4am/3 fltom 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 vertxdx6t+,swn6rb ( /.iqe jff9 uical axis and released from r6 ,uxr(/ 6f9+.enf sjdiqwt bxest. 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 hvxcdqnq v7e2;:s 3c:25 m/s hits an initially uncompressed horizontal spring with sprivdq3 v:sxne7c2hq c:;ng 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 down her 2000 kg c h1 1s,jcp.yfh znh1y6ar to stop for a red light. What work is done by the fri 1hh1,sj1yc 6zfhn.yp ction 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 t)6(6ij rlluw and a horizontal surface is 50.0 N. If the initial spee(j66 )uitwll rd 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 surface fac 3ct:z:3axhh82e x. It has 24 J of kinetic energy. The fh: t:fz 3x ha2c8ea3xcriction force 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 mass on a level surf) i5lq -u)rc 8xvgave*.l4jr lace. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the chan.)llur*lj8-gv vax i 4)q5e crge 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. Ini: coo9 v1su6z ,tk(h m3kwi4f the work done by frict(kos94 : nw3 huivtomi, 6z1ckion 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 inclined plane. The play z5a z8*l,5 ct0flbrxne is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the tozlt8r5fzy,b c0*l xa5 p 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 the top of a plane inclinecj *m*f-nhuur8 u/nz+ d at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. Whuz*h j8r um/*-fnn+ucat 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 hb3;(h2+-diw+ a ht lzerejqu -eight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What ave zh 32hi+ aqu trejwd-b;(-el+rage 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 usin,cb fmmzt19 g+ ywp4q,g energy when he runs up a flight of stairs 10.0-m higgm+, q ty4bp,mzcwf91h, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with a constant velocity eiwk yd 1g,.0fof 5.0 m/s. What power must be delivered to thkd.fwig 10y,e e 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 a.czpq/e b f:y.re used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = b.qc ezy/f.p: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 rivj 8ucs25 )1bp cfphb,ding. How much force does her foot pusp fp2b)s 8chub15c vj,h with when she is traveling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What i*s888ujqk8zkh osk ,y63mgb vs the average power delivered by the engine? (1h k*,o3 jbvkysug8q 8mzk8s68 hp = 746 W)

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