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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work expressed in SI unig. 26ks9u (kda06 gviapzi6wyh tvc5* ts?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if there is no mot+ii,kvolr00h ia;w (hion?

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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 aga +xsj *(m xd5tagh lhe9-,hll0inst a stationary brick wall, the amount of work you do ahlxhd9l*xm 5g, ls- j+he0(t

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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 iqq vi0l(t:0i vq+zqy*lwp d )4s being held there. How much work is being done in holding th(qq)4+l0 w div:yilzpqq*tv 0e 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 horizo iiu)y 8r y(5-elz k5mnnim0i.ntally forward at a constant velocity carrying a 10-N object, the aml iiur-z .k yn5nm5i )y0i(me8ount 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 tr1uf 3ms+tl.r,l vg5ehen returned to its original position. If the total m+r5ruf1 ,eg vl3l ts.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 on an object do workjc,)/8, d 1;n)avym+ l-aa 9 7gpmreaaskirom 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 donkvc/hz 5)n43udiu x1,qv9 kdoe by gravity while the ball goes up with the sign of the wor k i1d5qnc93xzuovvu/,d )4hk k 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, fp:2dlr+k (er7i. cdurepresents2p ur(:elki.7fd cr d+

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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 sc;w9 ism1 +b ba.*tfz3av/7lshp t-lrepresents the work done by the 39 bt b+vsl;lcsp1*t.zs wa /ihm-af7force 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:s3 frhmtr0e.sro9y7 object is 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 doner.sh):;lc, m z7gqal(9zahire ueo 7ox,4i-p on an object is negative, then the 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 zerom+zey )0 yh8im, 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 ady jo 23vhh0 7)yoqkq;s a car, and is moving at twice the speed of the car. Which statement is tr) d;j v0kh2oh7y 3qyoque about the 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 aktsf9i-h :v /J has half the mass of car K. The kinetic energy of car a9/-h: stvkfi 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 acfl6k a1kyu9elb-fq//rv*9dv y 9 m /gnd bounces back with half of its original speed. What is the ratio of the final kinetic eny*l99d-9 ervuvqymakk / l /cfbg f6/1ergy 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 j w3i(g, bu1aj7cyx 6qy42cr3:sjrul/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of ,wju1(c6racy374sqxgju:yr li3b 2j 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 qci q s (o:r 3q0q q90;xa;gll,c-fmkwmoving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object tr0(;l;:wqls,rifo c x qg qkc-0qaqm39avels 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,0yl4c l(x6otzgx 4 dte0 1+avq and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance wou4 td0oy l1 xt640(gqxzavcl+eld 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. Negl1 z)j:(ys*uzh1w gglzecting any friction ef jlg(1:)*yz hs1zguw zfects, what happens to the planet's kinetic energy?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy principlewd wk2.r1xbb* 6n ahv,p7r fz..
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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 +/8mr aaw,zu; rmy2wa llgo0bu: 2ch(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 obje iwt5znd2(w7pk vzh)1ct with four times the mass of the first if released from the same height. Thw vtwkn)hd2 7 51pzi(ze potential energy of the second object compared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the end of a spring causesmp*70tmlk i.r ) lg)nb it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of t*m.)m7 gtbp0 lk )nirlhe 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 of a syzu(o :v6/xb 6hfa+d/ nltcf9 3qf0jr nstem

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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 z/2 wsc*m:vnc ,mydn(its kinetic energy K, to its potential energy U.n,ws vy / n:c(m2*czmd

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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 caza5e z,n)2u: qpiu /bnr driving up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and)bx1,zfuv.dhibj v; wv60*v s a very heavy object are sliding with equal speeds along a level frictiz6vsdf .wu) b1vjhb0;iv,x*v onless surface. They both slide up the same frictionless hill. Which rises to a greater height?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses o,aag g;x4 k4n$m_{1}$ 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 mecha1hs8:ngv g p;r/92txqbwc4m bnical energy for conservative forces.81bngxb2ghsqmp: r4c ;9 vw /t
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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 bu;sdo4l3rj1u;)tjgysas pnw 9p1 m7h 8ilding, through the air (air friction is present), to the ground below. How does the kinetic energysj4g aw)u s1tor738p;pdhnly1mj; s9 (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 di7u8nso jyhk a ,yk-:*astance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational*8yajk,7 yku aso-n:h 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 4*v s/vcgh9 tuand loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy di*htuc /s9gvv4 d 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 consh-( 8zs 1,7vgupb mxcuervation 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-b/3qn 5ih.mr i- p4s /utphyy

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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 o m)sr tw sjqg wjhh-jar8+ z0.d.09r2xf 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 :(ovt 2ej-son o174di luwcu4pq n 7l/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 time. To do h ocik7+v; 4 3y:za0bq n)dxfdso, your powerq3h4v0 :bdcda;i7yf )z+nx ko 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 05 veksjzbvvvlez*;*w 8 qp92acceleration, 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 vertical8tv4v1l)/tgvb4bm 2 in0oo u xly 2.0 m and held there. If the object weighs 90 N, how much work was ttvo840vomib v u 1/2b4lng) xdone 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 oog gpjm)z be 9a b;oko)z 6wc1dq7j7;+f 1.0 m, at a constant velocity of 0.50 m/s. What is the work done byj dzbcz););aoek+q o7 m1gpgb7 9wj o6 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 consv vciaxl))-/ wptmt.8tant force of 5500 N for a distance of 50.0 m. What is the work donc8pt/m-ixvl. w a)t) ve 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 constant force of 5500 N fki8lx+ qvd8rz-9 t(skor a distance of 50.0 m. What is t+q 8lk8 9t(dxr viz-kshe 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 wyk.:bdismel))qpnw3 ,5e oj 2ith a constant force of 5500 N for a distance of 50.0 m. What is the net work done on th):w eiyo e,nl5bm )j2sq. dk3pe 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 p4/3q73lr sa9qpzh * lzj9kbt m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slides 8.0 m down a ramp, 9n+ z.h) cz4s bo)xdtginclined 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 littl *jl(8p3zqi( fv nf3c:ex1jqae sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0381 pen( ija3cxfz l:vjq( f*q 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 directikp)t *wz4 ne7usn4.ty on of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fint4z4.n)w tkusnp 7y e*d 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 in Fig. 6-1r0xct: .* lfshl-;io d w35cc6au0t yl shows the force versus the object's position. Find the work done when the object moves from 2.00 0 rix5 :at-s .l*dlf;clhwt6c ycu3o 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 Fig. lyz30:z y; npb6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to b;3l yn0 zp:zy6.0 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 o 1o0*(e kah8 yytyls1graph in Fig. 6-1 shows the force versus the object's position. atk(0 yy1l*ho8yseo1 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 +4uac6 oux v/3wwo:x ka 55-kg cart (initially at rest) across a 10 m level surface. What is 4 owka:+/cvwxuxu36 o 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 t(rk+6i m bsmd:o move a 55-kg cart (initially at rest) across a 10 k+6m(:sbm rdi 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/sw/q 1 6 dpnor+9f)1yya,bamhf. How much work is required to stop the maaqn fh1 po9,a)y1+m/y6f bdwr 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 stop a car initially moving at 25 m/s, what +v4he e*us. qbsv nin3*f6;z rdistance is required to stop a cv6s ur3f *nb+is nq4 *;.vehezar moving at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is cock/ z-st koau0o-ed by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligiblez0o-/t oaus -k 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 compopb-mmp er0 9a/fhfdh+cxt;:(nent 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 md(p-c hhm:fr;x/ +ta0ep9bf 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 horizontally into a bale of hay, striking the tva;kgx+w w o v- /ixlu6k01,lhay with a velocity0g1k+uvxti-kl;w a o v/,6wlx 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 o9lt,xng0piep6 .x cgr;d*e9 mf 13.0 m above the floor. What is6g,r 9me;pp 09it.* cdgxlnex the 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 jhxed-.tu: )can inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done bc)-jteu. hxd :y 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, causgpzlc;h l;zv66 qy: v ww-,1gjbt4t9zes the spring to stretch 2.0 cm. What is the spring constag6;z,j1 9bv4lzwvw lp6h- z y q;ttc:gnt?

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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 fyzzez59r;;fol+z j, fsuj (/ a spring constant of 60 N/m. How much potential energy does it store, when stretche sozuj9;5zrf el/ff;+ zjy(,zd 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 uncompress9)97ueo zrnc/- rao k+1 coyy-rhumc,ed spring with a spring constant of 25 N/m by19oe aozyymc/- cu-rr 7rc+ unko) h,9 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 constan,u56qexok -lu,( q1eqig :et zt 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is ate( exq,, quzke:1uio 5g-6qtl 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 ia qrf*h5heu0. s initially compressed by 3.0 cm. Howh.erqah*5 u0 f much work is required to compress the spring an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high sl,jsq2w bpo7:jde- uf/wr/r.zope. What is the speed of the skier on reaching thb,ju /sr/w:2w7dje - rpo.fq ze 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 ini a5guip2gd cao.8z6 c;tial speed of 4.0 m/s. Neglecting friction, how fast will she be moving afa8 6i2zucgg;.do5ap c ter 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 bottom, vpo*oj:bb58fz d (n(bit has a speed of 95:8bno bvb(odj*(p zf.80 m/s. What is 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 d9-xt 8b l9,jw7-soxnbm qmc2m above the floor, its potential energy exactly b8 -qn xls7 o-cwmt,xm 9jb29dequals its 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 st2yzqos 9dc1b2x eth 1f(t0 j3h7 rjdy2)szl d,raight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does ib,z7cez2 h2 1sht(f tx0d91 )jlq 3sro 2yyjddt 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 en ; d tnd+.brr4tro8sk7ergy 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, dibndotrk8.+t 4r;7 srdd 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 th50:fqe y8 o;8suagp hoe bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coasasq o:p eg;u hy0fo885ter 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 jc;aq2p-n 9 g8mcl7 emabove the bottom of a dip (See Fig. 6-2). c- gclen2 79apjmq;8 mNeglect 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 e + o)vclg-tw8the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the spw+)l8eo-gtv c eed 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 ta01+0p 2,oyl e7yezfzis y0941qe4hthxof rrhe 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 0.26 m away from tas yl9:8ollufd30z; i he vertical axis and releay:l f 8za;dsl 3oiul09sed 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 horic*kjnp )f8g: af;: d6ja7lp qwzontal spring w6g: 8acp f;):w7 kpa*fnldqjjith 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 down her 2000 kg car to stop for a r4x 0qjqjog6al* 6e n:ded light. What work is done by the friction force against the e0q6xg6jl ad:j no*4qwheels?

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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 sb-3dxh3 ll- d;hav9 dfurface is 50.0 N. If the initial speed ofh hb;9da3d- -fdvllx3 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 2rem/*dgt yh)8ya - 59mvyjj usurface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How fam)v/ ayh y9ty2me u8d5gj *-rjr 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 oo 0f/ -ru79 0wyd c 4s dur7yalkf(r.lrzqv83surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance4d o7-u93az( v 78 drsc flrrlqw0rk. 0ufyo/y of 10 m, what is the change in its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slope. If the wor5*go m 78dbu :(uzsim*x g6krzk done*sx m65*8rizd umo(kggu: 7zb 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 inclined plane.s, m0) ung2/l. c8 kzsoy-wrrv pg8u,e The plane is 4.0 m long and rises 2.0 m. It requires 3200 Js)/ kn,rw g-elpm2 c0 u8z.,y8ogsvur of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the top of a p 1c -z1uw)dmxq)w dyg/lane inclined at 20e above horizontal. The coefficient of kinetic friction between the mx-cd1zwqgu ) ywdm1/)ass 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 10.0 m, and s84;b/j l1brorsc rp, itrikes the ground with a velocity of 7.00 m/s. What average force of air frictrsrbb/;1r8l4c ip, ojion 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 u2 8tw.o ldp*dgp a flight of stairs 10.0-lgdo p.w* 8td2m 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 tojl3 ,l8nb .zz, nswtv- move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the fl.3z, tj,lzn8swnb v-orce?

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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 eneg3 1obc r6-ugvofv b83g3h /tirgy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746obv gg3o1/hvc6-ri tbug3f 83 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 g/2j- ,a)n1d)epuu ;sptewi vrate of 500 W while riding. How much force does her foot push with whe-/v)it du p nepe)jw,1;ua2g sn 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 is the bf n hb7-thkolv*338a average power delivered by the engine? (1 hp = 746vf albn*73ho8h-3b k t W)

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