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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 uni2 x2w(c+ xspiuts?

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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 j wdu,mdt 11:*myqa/d 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 stat7,t75o(*d tkou dkaekionary brick wall, the amount of work you do, 5o 7kk*7auko(tddt e

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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 li,h q9-ssxq;x-aave6i fted 2.0 m vertically and is being held there. How much work is being done inv9aaq s hxx6;es--, qi holding the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forwpjm gt6d3h0e7 ard at a constant velocity carrying a 10-N object, the amount of work you do ihmpg7d jte036s

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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 ve.59anz5uafi u;ak7 br rtically 3.0 m then returned to its original position. If the total weight is 30 N, how much 7uknbifazr5u5. a; a9 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 centripetalb u0tfb3 75iet force acting on an object do 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 th i3spiqwjo8t( h :cgp/* f;2nbe sign of the work done by gravity while the ball goes up with the sign of the work done by gravity whiotb :ijw*hgq 3;pn8s2f/(i pc le 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) grapvxkd z3d(l.2t h, representsz3t (xd.l2vkd

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus position (F vs. x), what represents thekm vwbv0nvp(hie bi w,y *:21au-cd1 . work done by the fo0v -,dbhv vek:p(12aim*uy n w w1i.bcrce 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 y ,5)d er:mt,e*iy zmdobject 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 done on an objr )l*0kpe; ;j-otoh zm,zfes 6ect 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 z4mqe4 yq7hy0 an object 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 asssvvba6( l- 7x much as a car, and is moving at twice the speed of the car. Which statement is true about tha(v6 svs7b-lx e 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 car K. The ,tvyd/9:5kukj psr0o kinetic energy of car J,ksr vop:5,d9 jt /k0yu 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 bounces back with 1.l )ke2:k mx hnqniw+half of its original speed. What is the ratio of the final kinetic enerqmh xk)e.n1lin2k: w+ gy to the initial kinetic energy?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of .(ju ab 1hm jxx tr1rt+t++8z.2 avbhz5 m/s. If both objects have the same kinetic energy, what is the ratio ofxhjza tz.vtj1bra+t(+.ub8 2 xm1hr+ 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-dgej+ ab0or (ojt03dje:/syx8bkp *7kg 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 greatt:7pebrjex 00 g*ajd(osk j3o/8dby+er 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, and skid ap 0racjsy bq:k8 8a5r3 certain distance on a straight, level pbrq cj a8s:80ya kr53road. If you had been 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 ell7r qskul4z, g;iptical orbit. Neglecting any friction 4rk,q; g7 zlsueffects, 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 prino-0b6yif3 i fcqdd70r dzr:q2 ciple.
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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 negative potesee1u8 rg*l+q5or7 me , ovq:c yjm5(qntial 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 v+m0uk:ijb9a(xetl7 rfs s (2tg+f z,rest a height h above the ground. A second object with four times the mass of the first i k0 f x+at2+fsigm(,(7:tjl 9zsvbue rf released from the same height. The 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 causes ih9)ql:) hwxs zt to stretch 5.0 cm. If another 0.200-kg mass is added to hql)9zw) x:shthe spring, the potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy of a systempw1y* 0hi+z(gt*g zzl1 rcsc3,1d ez o

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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 energy K, to its5d8i owa qo94/b 70t+yu)gqddf8 czaw potential energy 7 )fu4 td9ay8bd+iw qo 5aw/gczqdo08U.

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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 hill/,g6sd x:p xg2-but ;tb :j.z gpplzx/.

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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 juzv4( )9gr y qd*ukvy-p,*pqvery heavy object are sliding with equal speeds along a le p9kyy z (*j*,p vqu-ugq4drv)vel frictionless 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 ix)ozh8cr6gt - yl. ;w$m_{1}$ 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 energy for c2ql+9+ jcazeb onservative forces+jabze ql+2c9.
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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 /se h,y(vdut5 friction is present), to theye, dvh(5/s ut ground below. How does the kinetic 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 energy. Do not ignore m ld.2 yk9n( rob2rfu 2n)gbf(air resistance. How much gravitational potential energy di d.lon( 9yfu2)b2r (mr2knbfgd 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 i ko6u6 kqxphn*)+2tu2 r *gwigravitational potential energy. Do not i **qi2xk o6puk r)hi2u tng6w+gnore air resistance. How much kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation ofb uutpdn7n )h /u6(8du 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+7t3tu yi-td 7:qy bwm

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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 exp x+(*t7 *ru8ns6u fnciwlbp/s ressed 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 2 zahyj bf22p l7ks/,jis not a 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 /7p1soq7k jlk did 3 times the work in one-third the time. To do so, your power out 71 qk/7pojsklput 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 m)u6d kfl;k9 qa constant acceleration, 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. If the object weqps,q);vfq*8q jqk)l ighs 90 N, ho; jfqsqkpq ,)l 8)*qvqw 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 airxy ,hx-d27jb **mpbtq a distance of 1.0 m, at a constant velocity of 0.50 m/s. Wh2-ptjxb ym7x*d,* hqbat 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 .xw 5t.yu wd*g ajlt(u p1hv;nuk.5w; a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 *5hv jytuu15ul.w ;dka.x(w;.tpn wgN 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 forhn:v h zzq6lu*yr9 07qce of 5500 N for a distance of 50.0 m. What is the work done by the weil 7zz rqnuh hq09:y*v6ght of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 N for a distaw q7me 264 ybnoja0lfr4:ey*vnce of 50.0 m. What is the n4*2jb o eml04:ewryvya fq7n 6et 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 *as .spbr j02uu5hfc* 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, inclined afk5 v-p8oaxkd61r7vpob1;j,erw;mj t $30^{\circ}$ 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 x:xzpw)2lg)w7 b9sy.ha:vyf6i ki4o surface (assume no friction), with a force of 60kb6 xz:)9)2yxoif a.i 7yv shl pg4:ww.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 direction of the force. The graph in Figbr7u jm.kb )v5. 6-1 shows tk5)v mubb.7j rhe force versus 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 foy +x uva.t w6r c6t1s,rvl:jj*rce. The graph in Fig. 6-1 shows the frsxyjc +lt :t6j, wv6ra.vu1* orce versus 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 directi tzy: too kkz7eto +-.52-cctlon of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to 6.02 +ke:-czto.ttooc- zytl 7k5 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.kna x9. 0fbb7i The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from nxbf 7ka09b.i0 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 o cl;klnuek705k f7hzyf g k;6 h:)m.bef 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level ee mkugfhykkh. :nbf)0;5kzc67l 7l; 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 20 p1 tao7-fv4i b*nvl;lv3.fi/ih qd 7b0 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the cartav-dp7ioi* 7b lf/i4.btv 1nhvf 3l q;?

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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/q lv:,2pvbmvb t )9im work is required to stop tt,v)pvb m9/vi2:b lqmhe 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 skc-*js-ra:ne5l jdd;-0 ju h dtop a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under t5 nsde* -juckr-j;jl:-0 dh adhe 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 exertj qqhg;mn:5 */ kb rrm:d1el(jing a force of 20 N obh5 d(:;q1e j/rqkrlm:n* jmg ver 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 vert8v payq+ 4g(deical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the f aqyp(+dv48 egloor. 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 1 j9jfun ophb2a iv;r(5mk2w30gbk e: the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before1 rmeb9ju2g(hp 5i3 f0bo w2kknvj:a ; 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 heigh 07bgi(-q 1bev ay-rd chm36vu2s7hz pt of 13.0 m above the floor. What is the change in gr- y(6gp-i0zv ea urdh 7hc3bsm7bvq21avitational 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 ups,j /v um9a5rp an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frict,am ujr5 9v/psionless, 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, cahy0ntb) z//sp- xa 6i;ald 9ocuses the spring to stretch 2.0 cm. What is the spr6p) 9sa x/in ld/ctohy;0-zabing 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 f9oe)q ku9n)o constant of 60 N/m. How much potential energy does it store, when stretched by 1.o nfqo9))ek9u 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 tog i0 o bur+it:;/ipcx+ compress an initially uncompressed spring with a spring constaii o+t;0u/ +x:icgrpbnt of 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 fp / w(whv8*evwm8mh: of spring constant 40 N/m from x = 0.20 m(wvem*p8mhhw /v8f:w to 0.25 m? (Assume the unstretched 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 i ;vv;xsmf1wh ,s initially compressed by 3.0 cm. How s h;vvm; x,wf1much 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 re/o( ;n4vqfsep t)ary9q .e cz+st from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (N/qqen;po4c r+etf9a )yv zs .(eglect 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, pusc8 f(, w 2-bwrck8yzbzhes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how zw8 ck,y8z 2-f(b cwrbfast 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 planf6-jvu(jfvne . yq7 0ue. At the bottom, it has a speed of 9.80 m/s. What is the vertical h7ff6u(ey 0v q.u-n jvjeight 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 t(,.wk5av4w8jwtzw n :zkha8mo the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic enwvz8a w:4jh tm, kwk( n.wa5z8ergy. 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 fromhl*z sip2:u z1r:rcw 9 ground level with a kinetic energy of 40 J. At the exact top of its trajector:ripzr9uws 2czl :*1h y, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a k n3pug)jjzc8ab8n-/ winetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relati)8n zcj a83bjnw-p/ ugve 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 ab5hpd6 ij)5wtsj- +5zpmva+ u wove 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 m above 5vmpthwi5 +z6- d)aj+sw j 5puthe 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 p 6fccb:j6 (levoint 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be th6jvcf6: bel (ce 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 pointyt9k-vk v/ddps s+m z1d-5dr 3 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, which is 45 m above the bottom v13ksm5 kz -sdyt dvdd+p-/9rof the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its)0 aa. w ej -1 h7gq,esd9wdjscvvl/y2 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 fnzi7 jrq23tc 4rom the vertical axis and released from rest. What will be its speed at the bozt2i nq3jr4c7 ttom 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 uncom6,e dbluv,s b8pressed horizontal spring with spring constae lbbdvu,s6 8,nt 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 d4t0pu g;u:bm gg+x,b)ngab i9 own her 2000 kg car to stop for a red light. What work is done by:+ngagi;40) u p bmx tu,9gbbg the friction force against the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg (jnvsm-,:sqy nal-b8object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 -8:s,-a (lbqymsvnjn 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. Itkmit3zdi0 hrb jm5ln kr3 )336 has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slid0 3hrjl6z3krim3tn3 )b kmdi5e?

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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 tofzk1d9) , ref 8kh3ji83xyyad a 2.0-kg mass on a level surface. The coefficient of kinetic ffh8ka 9 zxe 3,rj 1fy3ydi)dk8riction 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 a 50-m high slope. If 0)+klxp:e9avan sf xwb5qt04 the work dbxt )a+al0f psxe:q45wv0kn9one 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 inclin.ux dhpo:8 j*wgk6r/ ded plane. The plane is 4.0 m long and rises 2.0 kr:doxw d*8/h.jgp6u 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 the top of a plane inclined at 2x:8o:kp 6xsj.i g* iuv0e above horizontal. The coefficient of kinetic friction between the mass ujxx6s:iiok*8:g. vp 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 stri,-0bvebbxzom/kviqxm 12 +f) kes the ground with a velocity of 7.00 m/s. What average force of air friction mbb iv,x zoq0 bvme 1f)k-+x2/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 b) o5p,xenwe c6qoi, .flight of stairs 10.0-m h)ewo .xbc5np, o 6iq,eigh, 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 x2 f.t2 omj .aho9yisk3 e-w3dan object with a constant velocity of 5.0 m/s. What power must bo -ys92. ohkfxjeat d3m3w2.ie delivered to the object by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr?k21 x9-jybqtcjph8ubt45p+ c (1 hp = 21-j pjc8 9hpt yt uqc5kb+b4x746 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 4w:n54yy l8 v;ltcok nW while riding. How much force does her foot push with when sk8w4 :nyyv 5 ;lconlt4he 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 th8 qfg+a0r wd:ze average power delivered by the engine? (1 hp = 7468qzf+ r gwa0d: W)

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