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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 exp 8d4.iewrv (hlxww9,kressed 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 there is no)mzm +r. :ahzh 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 walpmb:2m 6qttlu x/m7+k l, the amount of work youtbx2u7+ k:m m/6ltpqm 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 andumbxl ft:zr, qt 51v/3 is being held there. How much work is being done in holz5m: ql/v,utxr3 fbt 1ding 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 horizu)m*c) vsxyxr7q8j/v* 80l k)vmjr(cw vw1b lontally forward at a constant velocity carrying a 10-N object, the amount of work 1c lxvbrmx(8 l uws /v7))mkr jq*)8*c0jwvyvyou 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 returneedlept//y :d97; lrxo6 rz6 kdd to its original position. If the total weight is /yo;:r9e6 /x7 ezp6ddlr td kl30 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 on thyj djob+0k ; l0;pu;.nbj6rz/ q)jani e 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 c +4 hue3)+hs 5zpoqncsign of the work done by gravity while the ball goes up with the sign of the work done by co hu n 4s+)cp3qzh5+egravity 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(5hth 2f .ks nq*l2lgt3mt +nb, on a Force versus position (F vs. x) graph, represents.+t5h32nns(2blqlf thtk* mg

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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 (cse2bzqp9+ r0e 5*t biF vs. x), what represents the work done by the fot 2q0eceb* rbs+ zi9p5rce 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 the object's kin 3hdo+ oj o*f8dcfz/iw0z12 emetic 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 objectf; w exdye1(9g'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 zeroufif+voyy 5( 3n-r4jib a5v4 g, 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 adnut)87 hv.l fs much as a car, and is moving at twice the speed of the car. 7lvu.n )fth8d Which statement is true 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 Jn/; .3cgdi alv has half the mass of car K. The kinetic energy of car J, compared to car nl a3igd;/.cv K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its original speed. Wha 1*ey v(**qnpchqm2t lt is the ratio of the final kinetic energy vmh qy(e*tqn p*c2*1lto 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 spd7t qauv:v)1c eed of 5 m/s.t qu v:ca7vd)1 If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is movicq r ./y;ot7amng with speed 4.0 m/s. Both objects e .arycm t7;q/oncounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a p6 +a3yqj0kujryqbs;7 anic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skiddedr7u bkaj6+y0q3 ;ysq j, 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 orbitso(b2h1 ainl3d the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energy? n adih2blo1(3

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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 principlb-k.m 2fvkw f9e.
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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 system9i4yjn0o1 kxx oy4o4 i 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 object.rmulp4k,;ra with four times the mass of the first if released from the same height. The potential energy of ther l4 ku.p;am,r 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 it5p u*g 9/l0cl: tok oczwyv4k6 to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the 6kvc : p4 lk09ot*uowzg /5lcypotential 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 of a systyl u 5cv:hcrg*8;5sifem

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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 i5qx.47r)su b cncsda1/ 4exuk2rl x x05. cqwdts kinetic energy K, to its potential energy U4s57ku 4qd /ux1a2d x) rbxn0c.l5qrcsexwc. .

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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 hk nk0zbomzj)q-z* )u 9ill.

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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 ay8 qjf5m+.0kz(97ve2bqg u3ony fvxheavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater heifx7en jf .5vgk2ya u 3oqzbv0(98ymq+ght?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses 7zz7hurn r,8- t:so gw$m_{1}$ 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 enerudqi,; 5j+,6rd spx(m g fhtu*gy for conservative forces; rupxud,mf(5dsh* q g,ji+t6.
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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,qvfv.n gv *l89 through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before strvv.8q*n gvlf9iking 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 gatk0fw)w;h w.qins 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball l. fwhtwk ;q0w)ose?

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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 potential 8 zi9/ qgs1mnvenergy. Do not ignore air resgm iv /qs98n1zistance. 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 enerm7 dd h66q2pw-jmdpf 3oc4i6rgy.
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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 2hsr, ,br vu*-hox0 x0ym;hlmtja)k;

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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 tq5q m2:f/-)5k ) mp mmdguf01zl rwempower 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 powefp9nj .1*xjvh y)m bz6r?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, r a8djsu6a;3 iyou did 3 times the work in one-third the time. To do so, your power output must hada83irsa;6 uj ve 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 engine mu6u,xl .dyzicd*i *7oo;3hghc(r .m ztst

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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. If the object weighs 9j : zzv;nv g-ma. o 93chvmo0-7lb)tvq0 N, how much work was do3ov9--zln gam)tcv b7:ho;v qm j0vz. ne 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, at a ch++v dvml(ie53s; ly wonstant velocity of 0sm v5l (v wi3d++ley;h.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 pulled upward with a constant force w9k00ea 4naqx s8k(.jn sh:ind(kr7lof 5500 N for a distancqx7dlnn r(.: ( kw4 ak9k80j0shai sene of 50.0 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 u8ugkely3xh4- xgs 32)mp-j3u ; epd v2lv +rolpward with a constant force of 5500 N for a distance of 50.0 m. What is the work donek2e)pexso+hl;-r3 83 d-3glvgm pj4v uyu2x l 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 ubs -cxj:7i.vr:tr t3h a constant force of 5500 N for a distance of 50.0 m. What is the ne: jxsr ir7 bvu3:c-.ttt 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 vf3 if*ksju w,69h5pialong 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 s1ejv8u kdzl+c 3rp, .alides 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 ac r70j7gqq -hu9eo .ksister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at -egcq h 97r7u 0aq.jkoan 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 directiongmg4gqy d ze3 5n983ofvnvz .. of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movesdz9f n4o3nqggg8v. ez3 .ymv5 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-p1-188euyy yc1a:11 sfwh bm1 2ukzkiof7xqj 1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.- fso711p1b wmu1q zay kki2y f11jy8cu8 eh:x


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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 do rj cq ; 9ys2t7-puzq3ca1cr3irection of the force. The graph in Fig. 6-1 shows the force versus the object's position. a z rc t;ccsu33jr297-1qqo pyFind 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 i6rkgl jodjfub3+6 9ppv 9c4 5gn Fig. 6-1 shows the force versus thel do6jb5pg34v9kguf j+6 cr9p object's position. 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 m, hmn0* geuu7p+h mt+move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the cart?p0+ + gmet*h,m7mu hnu

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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 toq-xka.nn; n( t move a 55-kg cart (initially at rest) anqta xn(.n-;kcross a 10 m level surface. What is the final speed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How much work is required tolu21l 9hi xm ipc)qp:1r jr:;e stop th ip; e1x9 uq 2:mjclri)1p:rlhe 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 (j3s 6i oa7ifj25 m/s, what distance is required to stosj 6 7ao3ifji(p a car 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 cocked by exertingw;l 48z;cx cry a force of 20 N over y8 ;lwc4cxz ;ra 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 amjbr.xi.b))9bj6 c nb nd 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, andbbj.9b)xbrc .) 6ijnm 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 horizontally into a bale of hay, striki1dl .06g*. wub4cp t2wdacxg dng the hay with a velocity of 60 m/s c bdpud.l6xgdgawtw4c *0.21. 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 79j4wq9:rznl67 .gmu )kv2rpy oh jg8b.00 m above a floor to a height of 13.0 m above the floor. What is the change in graygp68 )2ow7ngkrb rh9zjmu . 4 qvl9j: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 plane. The plane is 4.0 m lowg f: x/ ,fm3ij6vb:syng and rises 2.0 m. If the plane is frictionless, how much work was done by the push?xi6:yj: s3, fwfbvg m/

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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 stretch 2.0 cmx /v0 5ni+apmx. What is the spr p0v+xxai n/m5ing 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 N/m. How much potential 1(6cwz rxo15mdml qb4 energy does it store, when stretched by 1.0 l1cmr bw5qm(x64 o1dzcm?

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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 u,4o+unso.z u: d7rtoancompressed spring with a spring constant of 25 N/m byt7 ordo, 4z+nuuo.s: a 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 /r e9-vfqgae2constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the u v2e rqe9f/g-anstretched 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/mtuiy trz .z26 7)fklf6 is initially compressed by 3.0 cm. How much work is refu y62ttklrz7i). 6z fquired 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 slope. What is thwmysp1 gely76v0b tg9)9ik9je speed of the slier on reaching the bottom of the slope? (Neglect fgjgy909b 1 p)m t klwyesv796iriction.)

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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 hiw1ok :374g3ku b xhnx)jrv+vfll with an initial speed of 4.0 m/s. Neglecting friction, how fast will she vn j)14rguovkx+x7b :3fwh 3kbe 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 planr q17ghkpur2 0i2sy/+hl8px ee. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plane0 /p7rir8ekhyp2+u1 lxg hq2s?

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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 fw :;u 5fom7hryj9xd3zloor, its potential energy exactly equals its kinetic energy. How fast is it moviy 9x j;wum:ohf zdr573ng?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighifo ;kt5vrvp lnwud 3)/*4acb9ng 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is )9k*ub3afl/o v4 vwcd5;rn tp140 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 thehw)6p34l ky0qra azp;ldx,-s ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To ;qlp,kld0h a4y-xr)63zpaw swhat 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 ge d6 2eqoth*vio,6pas33.gk at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed o t,2 h.a*qoesi3 3dk6e6pgogv f 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 cbgd*: ggi7p ;yb;l(jj tr9.fa point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller g:b;bp gt.g9yjcl;f *i(7jrdcoaster 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 8a2u;ahwe /,w zz.swc m above the bottom of a dip with a speed of 25 m/s wa.w s2zhecw /; 8,azu(See Fig. 6-2). Neglect friction, what will 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 bottom of itsd c(k1- wli6jw 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 pulsnrotx43ckav+ /0 du 69uwj q5led 30 cm away from the vertical axis and released from rest. What will be its speed at the4n 93xusc56kq/ ovtd+ua wr0j 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 uncwyepb(4n(sc 3v(k(, cdbznd ,ompressed horizontal spring with spds(y bce pv(bnk,d n4wz(,c(3 ring 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 pbcl) w3 fdf;o5 rk,p,p:zs4v her 2000 kg car to stop for a red light. What work is done by the fricti b k ):p, oc3zfpd;4,wpsrfv5lon 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 horf 9*+tq)jbtr d7ws jh;izontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what dis * sw;jtjdhqr97) ft+btance 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 surfah3q 4c nbiql99gkc;6j ce. It has 24 J of kinetic energy. The fricti 9 ngc4k639blcj;qiq hon 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 q8wb54pv rwd. level surface. 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 change in ibd qr .p5w8wv4ts 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 wl)x usa:egzq8o,+ -8d bqj4r 50-m high slope. If the work done by fricl qxd :r+)s gaojz4b-eu88 w,qtion 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 inclinvv o)4w9yfb7 ked plane. The plane is 4.0 m long and rises v7yk9 fv 4ow)b2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force 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 thep:fatux x-sscbhh,:57dtq ,9 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 after t5p hsxf at:d9s:7q,,hb-xc usliding 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 strikes the ground wofdp3l0batc4vo )xc( x ik45-ith a velocity of 7.00 m/s. Whdxvo xkc)( 54 bto 4la30cpf-iat average force of air friction acts on it as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energ/vw8 l1; kdu9+ks4dmm ybqa1zy when he runs up a flight of stairs 10.0-m hi9mqlyzm +/kd;8buv4w ask 1d 1gh, 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 velocitv7zp5ii/n l * 63ndml.garci, y of 5.0 m/s. What power must be delivered /cn57dp vi iz,a ir lngl.*m63to 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 for 1.0 hr? (1 ikupk6u +*2xl 1 pp5xshp = p 6px 1u+k2ui5lxskp*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 th3l6 g ;vybd*f /gp vb0q,ud.q9v 9ospme rate of 500 W while riding. How much force does her foot push with when she vylb0;pq3q*b /,mpfsvg6d d.u9 g vo9is traveling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average h:0mtj 7 onyi(:+g 6w;pq)totak2zui power delivered by the engine? (tot+:tai;g2 kpn7jhz:w)oq60miu y(1 hp = 746 W)

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