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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 ex+ iott dw ,3iraefzq- .a4;yst9+ l:bnpressed 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 tmr6caml q 3m*nto/9 la 34rs-a system if there is no motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard againo wv0 : vpkg 19w4c6fadl,hx2mst a stationary brick wall, the amount of work yoo26 wwkxfv:d g0p am4 vc91h,lu 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 vj(u;ir .p(lg8zw+te0gkj x +is being held there. How much work is being done in holding the box i0rkv(xzl ; t8.w+ je( i+jpggun 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 forward at a constant velocity carryinxb(dsl665ru(gv+zy mg a 10-N object, the a((yzgl+murxv6sd5 6 bmount 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 ve ng2xq5fg 9 lo(q3b3yartically 3.0 m then returned to its original position. If the total weight is 30 N, how much work was done?g2fnl(q o gaq3yx35b9

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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 o;n 7y.om:0rdcgvteo /n 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 the sign oqq*.8w; p(se bishk2of the work done by gravity while the ball goes up withibqs(q8h; w.*eokp s2 the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force,utlpx c85h0( 0g*4; k yprf2lqpoiqj versus position (F vs. x) graph, representsjxf2q,u0 pqy 8p r;4(o50ihl * gtlcpk

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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.st twcyqp: ,:94/z o)bedn x(d x), what represents the work done by the force F? w:ds)y dtz4pt nbxce(/ ,q9:o

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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 kine)(m.v/m sthw4zd o;we kj3)b qtic 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 o tffd( ph.k0024 1e eh:4:jkqhbmsiv9j-sx kbbject 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 zero, then the object's kinetic v: s .mnn,)35 6xbow z(pexlqb+pm,mwenergy

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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 atn. coh, h:w6j) 9-ttb juzn:ns much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to :)oju:,wn-6zntc.jn 9hb t ththat 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 zj*h2c8u 9ha9ph.4y hqtxg j2has half the mass of car K. The kinetic energy of car J, compared to cah.zu2cj*p9j9gq th x8 h4y ha2r 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 ltxas c5d,g1y)vo8g) original speed. What is th)o8gxd1c ys5)g, av lte 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 of 3 m/s and a pebble is moving at -8o t) k7jbr6exz*dq8zz u4tj4(lc jna speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's martnj z6eqt 8*kzc4jo(bjzl4-u7)dx8ss 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 8ack1x0 6l( *2a xw(l+ dzpywbp t9vvf2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before sto(x 1tc+v falb *2vp lyx60kdzw9w 8a(ppping?

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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 nh0o bcwejg:3 rhjf f4ml2jx c (k93(;in a panic, and skid a certain distance on a straight, levef n4:( jxfhcwr9jmbh33(2el0joc kg;l road. 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 elliptical orb-.0uq4.xz zqvtus n;rit. Neglecting any friction effects, what happens to the planet's kinetic energy0zxs.u 4tvrqu-. n;qz?

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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 principy7l(a ni:i hvw4r-6j6g ,fozt le.
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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 potential 24( g6fmk: ld5 o/ pi4p/mgvonfd qfnz7ot) r*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 abover 2rm66x pl*0 rdh8emj the ground. A second object with f8l6j e0r hmd mr62*pxrour times the mass of the first if 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 attakw3 y4p,r. w)woiy 5zcched to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is adiw5p3y w 4.w),o rkzcyded to the 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/l1o-oijp2xc 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 k3+ dzog;g, pq0t4y qfoinetic energy K, to its potential energy U.ot pqgfydz30 ;4, +qog

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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 drif2u2ra o)8v222jq oyea isv76 zed7mgving 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 a very heavy object are sliding with5 5js.7u2z5cc eywcyy bm-mh0 equal speeds along a level frictiyy5s2uwm75 -yzmcejcb . 50chonless 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 lt:4 o/,n0y- ns(yhaz4wljxmmw 8k.x$m_{1}$ 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 mecy:q9hnxfe3pk f8z6/uhanical energy for conservative forcesh: q fu px6feny/kz893.
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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 ofk :( y7iblmq i5ze)ng.)rd,c z a building, through the air (air friction is present), to the ground below. How does the kinetic)g.n7ykdicm5q b :erlzz) , (i 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 aw d)t.n,gej2x8e 9iouj dx/c9ir resistance. How much gravitational potential energy did the ball losegw9jxd.tx,9 io e)u8d2cjne /?

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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 gravitationalkb2) vz0t, 2u+,mwr f wqmw8mx potential energy. Do not ignore air resistance. How much kinfm2+)v u2qmxw,8 z bk wr,m0twetic 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 conser8d))sl*f( mjvt ivon8vation 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 isafy5;vd570k hubwf a8

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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 exprea4x1c;zf2adpzij1 2m,q;z w*vxtemai2/ q-e ssed 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 yn0gwvp v.zn-a8-*h;ef y;o q is 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 did 3 times the work in one-third ,qu ozqng-0wpre5 )gq9pq57cm;ky 4r the time. To do so, your power output mu5k;eu qqnp)4qr0 9r w z cgp57ymog,-qst 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(l 6 lkq4u*xb jug o26v:bab/0.zzamd 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 the0 ;;y*vi-teiss :rk:k yyi*c, b 2jnqwre. If the object weighs 90 N, how much work was done in liftin,0yqkwet-** yis;2b: y jrii ;nks:c vg 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 conss pk; 6y7/zxd( bpmnh,tant velocity of 0.50 m/s. What is the work done by the weight oy hd/(6;m7 nbszppx ,kf the book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5dlvsn1q-.yq3pat/w ,8uxz ; t500 N for a distance of 50.0 m. What is the work done by the 5500 N fo1u-t;. ,sn/ pqvw dqyx3ta8lz rce?

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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 v) v3iu v4ummy/hb+/m constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the /+buvu43v /v m hm)ymielevator?

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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 wxqys,fwo k8,) tfx c xl0* ali0//a8yiith a constant force of 5500 N for a distance of 50.0 m. What is the net work done oitolaly0x, ,ywc 8/fk x8 qx)0i/s* afn 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: a0vd+yiik8oz5*s) 37jy w*aamecvg.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slides 8.0 m do+ uduhf)rzm,l phjy5c*t: i,2wn a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sanc6h/qpwy9i7y-q/ztnz .k/j rah in a sled on an icy surface (assume no friction),w9ync qy.6/zq-np 7/kh/itjz with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an objec: d5:- nyoqizft in the direction 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 0 to 2.0 i y f-:q:5donzm.


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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 o2ul)cl c*cewvfp 2nkq:+3snl ,y /3aforce. The graph in Fig. 6-1 shows the force versus the object's poc*, cp)/kn 2law v clq3u2s+e:3ofny lsition. 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 obj.vv rgfn z)8,lect in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obgnv,z fv rl.)8ject 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 gra7b1s8 /ih jly xly43v6k bjcqbb(2 d(kph in Fig. 6-1 shows the force versus the object's posik2s1b(y i 7x6kc (v/blblj 48bhy3qd jtion. 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 a 55-kg cart (initially at rest) 1w1wzw3bv10e of/l, f pdoyo: across a 10 m levef wod0:ef1wp 1yb ,w1v3z/o lol surface. What is the final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg s-k3 +ugglh4 ycart (initially at rest) across a 10 m level surface. What is the final speed o+y g-khu3sl4 gf 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 ozeak495dz0d n k ,9qljf 5.0 m/s. How much work is required to stop the m dljz94z5dak,q 9e k0nass?

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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 * )eedrls0n1q.xt fv(m/s, what distance is reque e rtf1).d*lxnv 0q(sired to stop 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 g8 sxwa 4j.a;aibf crj4* /xa(yun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. Witayfaj4cx8 .r*xj/s bia;a(w4h what speed will the dart leave the gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal component of 80 N and a vertical ;hq w1dd47zac 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 horizontd1zw;adh cq 47ally 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 o.w,3ip,yqxv8ukzb gz3ue;qv)v(q 4: nbn1ohay, striking the hay with a velocity ofvp nweuoou ;k 8)(,4qqb.n:v1v bi,33qyxzz g 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 z4xl02ebb d;j m above a floor to a height of 13.0 m above the floor. What is the chan ;ze40blb dxj2ge 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 an inclined plane. The plane is 4.u;* -ag1ykrumnng on u6 tc6ar)w( /v70 m long and rises 2.0 m. If the plane isn67m)a6*wg-;cnnu 1ry kga(t/ orv uu frictionless, 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 sp5d z4 tvh3* 6c-jcugdbring to stretch 2.0 cm. What is the spring constajd6*-bhug4 zc t v3c5dnt?

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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 c* y x;q-3v8zjc*vidwn onstant of 60 N/m. How much potential energy does it store, when stry-3iv v;qdz*cxn8*jwetched 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 ir3 .tpbn*x4c to compress an initially uncompressed spring with a spring constant of 25 N/.icp4b*3trn x 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 x =7 1p3 (8 +g 9tv1dm(6mischxdwbkbnsx 0.20 m to 0.25 m? (Assume the unstretchet h3mws1kx9((d+mi1pngv7bs6bc 8d xd 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 compressed by0v2ld /0sj vf/t5fgvh 3.0 cm. How much work is 0lv /v sj2fg0fh5/dvtrequired 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 t1c 9r,4l8i jrtemdn4b he speed of the skn crdt9b84 i m1lrj,4eier on 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 initial speed of e,7 tdd +xtzj74.0 m/s. Neglecting friction, how fastje xtz ,+7dd7t will she be moving after dropping 10 m in elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plane. At the bottom,0rgf .a36iz 7 q,xxskk it has a speed of 9.80 m/s. What is the vertical height of the p gfx0 z6.,s3kq7rix aklane?

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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 floor mvk/je*xw,b+dt+0i d*8 aglv, its potentia+b0v/vt, eg*ajd k wx8+dim*ll energy exactly equals 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 straight up fr p1g.s+ su-k srcw/oi.zv7mr3om ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its towrs +.-/mucv 3ipkgrsosz1 .7tal 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 leavhujppif4+dq ,65k 1uk es the ground with a kinetic energy of 220 J. At the highest point in its traqu kf 1h6k4ij5pu+,pdjectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 4oyozl kkp)tzb 05vz 2zh-j2:+w *2tkj5 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 m above the bottom of the dipyhzk)-tlz:z2ko0pz vkb o2+5w*t2jj?


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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.+tu knm mrryl,5e 48a40 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the spe5em,yrkmt4a 8+lu n4r ed 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 start d6pfwz *7nelgr1)v.i/ ut /jbs at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45b /*lfje.gviz7 d /6w1ut )npr m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its swik9-ddt um q c/u349dr0//ta k9nlft q r7)zvrxng (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 ,f*jb/8pykt ac8/ -nj chxa+ s50 cm is pulled 0.18 m away from the vertical axis and released from rest. What will be its speed at the bottom of h+c ja-aty8fj/ kcpbn*,8xs/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 uncompresselsxx43ror9npygtsu5 p :stt*5f- z1-d horizontal spring with spring constz fo 5r31- 4psgxtt-s9yx tu pr*s:5lnant 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, sl 1* m+-e hsefej5s:e;y6b yjfsows down her 2000 kg car to stop for a red light. ymse* 5h+:f ;eb ejes1syj- f6 What work is done by 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 object and a horizvx dzpf. (mf9fd + vxo:u5/o0eontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it s xvoxv o+9fe u.dd5mp:/ 0fzf(lide 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 surfl.vxf4fx69;o9 cfzd (d, ,0z3wab1thgjv jyt ace. It has 24 J of kinetic energy. The friction force on it is a consxv,.zztb6(ytf ho 4 9 jxdv,gf09cwaj; ld f13tant 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 magd b(cr5x reg3fty8)* ss on a level surface. The coefficient of kinetic friction between the mass and the surface i( rt5g) b*e xcy3gfdr8s 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 hi2/hje -oxh5 pfgh slope. If the work done beh/hf2o 5xj- py 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. The plane is 4.o0,5* l-;fpod z ;hcsdn,ncoq 0 m long and rises 2.0 m. It requires -0do nhql;sccnf,d5o ,p;zo* 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 4vs :4ordw, bkplane inclined at 20e above horizontal. The coefficient of kinetic friords, w4 v:k4bction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground wihf 9(5epbnprhcxe99qm 1:.c tth a velocity pph:fcmenq ( 95etc9h1 xr9 b.of 7.00 m/s. What 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 energy when he runs up a flight ofsp+55b sh8adu stairs 10.+s8hb audp5 s50-m high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with a constfo b4v, m:):/wdkacvy ant velocity of 5.0 m/s. What power must be delivered to v4 mb:aof,:ky) cdvw/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 h9r 9n c4k9vod ii,r zpo/tw -s17e0jzused by a 1.0 hp motor that runs for 1.0 hr? (1 hp = o/od4j r s-e9vz itwz1hp 07in9c,kr9 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 riding. How mu2he4 t7;xhjetch force does her e42x 7;hehtj tfoot push 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 4r sj8o )r:e;rv 5ob gmuqi*5rs. What is the average power delivereq;54gs5bm o*)r8 uorr:v irejd by the engine? (1 hp = 746 W)

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