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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 6qdyg-i2p+lzunits?

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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 sysx)ev/m a3d du7tem 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 against a stationary brick wall, the ajx55 t*bm;hotxl m-sz2bz7v 0mount of work youox*5ltz j m2 0bsxmb5zv t7-;h 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 verticall2i 79kgjkq0 q -s kvc0roh60(kigsj+ky and is being held there. How much work is being done in holding the box in th c09gk+q-0 i hsk2g 7jsi0koj6k(qvr kis 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 veloci;,,x a p4utgcity carrying a 10-N object, the amount of wor,gxa cip;4,ut k 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 waterl -q/e/ena5jt is lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how j-a t/q/n5l eemuch 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 acting0 1ssgs kmyy.t/6)bw w5edt, j 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 stras)(vv qoolgp(+o9 :8gdf uvw1sc 0a 4aight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the w1) (pv qv 89 dgovwluaooc0 ssfa:g(+4ork 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, representp)+z:d pu(je vq6q *wmsw* pdqpq()v m 6eu+j:z

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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 tcc xh3cd nrk0q w5w7o *ig.a;.he work done by th 5c;cc.7w whioxa.n0dgrq* k3e force 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 the9*7r0mcxk*o )w r c p9ms9b6clz0xdyr 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 object is negative, then the object's ka e0+3; gdbl lvkoz,g-inetic 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 kinetzbas- 4 ozg4sg3 w-pn7ic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is moving at twice the spee x,0ex,iv- vy,jbyr1ed of the car. Which statement is true about the truck's kinet e,vx,,y1eb ri-0xyvjic 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, p0w-8,x hk*kyr b 9w/v1cwghk and car J has half the mass of car K. The kinetic energy of car 9 g*xkkr- 80 wckpwyb,vw1/hhJ, 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 half of its original speed. What n- 43advv+njra x09p his the ratio ofp av+d0-j3ax4 9nrvnh 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 t-pg1rl j 8 0zjbkv 1hzjv d(qdl-i/(6a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the rat-kvj p-0qr 1ld8id( j6bzzh lg(t1vj/io of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving witbp:- ls9/ohv6t8 e ebfh speed 4.0 m/s. Both objects encounter the same constant braking force, and arbphesfv9t -:/b86o el e 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 panic, and skid a certain distan()wxnn/* jq: yt7v uyece on a straight, level road. If you had been traveling twice as fast, what distance would the car have skiddede tq/yxv*()n 7 yw:nju, 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 te3 kogow :o9uh*5lyc2 he Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's o:5uky9 3o*oegh wc2l 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 principle.jpn:if1q88 0g, u tajk-i;orn
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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 syste(k86 zkeb y9;tdwr)j qah( /sfm 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 )7t hxty)pb4cground. A second object with four times the mass of the first if released from the same heighty4hp) tx)c b7t. 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 causlg,7wo qj,s )ces it to stretch 5.0 cm. If another 0.200-kg mass is,7lgws)jc ,qo added 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 ene4. .b0vzgge*zhqnv7 nrgy of a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy K, to c :mr) jrusi,70p1 fzfits potential energy ,)fcrjrui1 0 m:z7 pfsU.

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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 yerbyk 94rgtve 94c)pg; v30z 6mehq;a car 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 a very heavy object a4lx11sl uqx17b *vzk ire sliding with equal speeds along a level frsu1xzqxiv *l k4117b lictionless 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 crhi duf8d69 +)co6pw $m_{1}$ 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 odr b.+koahq7 +n0w 9uk (vmup3f mechanical energy for conservative forces3vdu .mp(n0 k q+7h+b krouwa9.
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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 friction .6 q4zubogh g0is present), to the ground below. How does the kinetic energy (K) just before striki gg46 b.0zhuoqng 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 ofqzv788kseoc 0lw;xe:wvpd1qwf b5 4) kinetic energy. Do not ignore air resistance. How much gravitational potential enw5 fd0x: z)w vwqc8pk7b;q8e1lsve 4oergy did the ball lose?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and loses 30 J of gravitational pg0*8dj2i(q ychf lx8x l*3nlmotential energy. Do not ignore air resistance. How much kinet(f*8qc lh lnxl208gmy 3*j idxic 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 conservacip) ty-aj.fyyk:c(: tion 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 isbnog 7; 7hajh)

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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 uni4+, tnkkkhn8omgr :k*t of 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 2gem0t qza/+k4r o/ogunit 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 df(avuyb. r *z1c z jip8.w(-e9df k)utid 3 times the work in one-third the time. To do so,b( c.faw.)kuv iryepd1f9 z8tu-*z( j your power 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 acceleratio6a6,w1 m:pu/ih mmz4qijql dy6ht +9 mn, 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 heeuewmt q*tv *;wzao; x :qn9w d6n*i.-ld there. If the object weighs 90 N, a;x u*q-z i6w:ttd.ewm9*v nn o;*q wehow much work was done in lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distance of 1.0 :qxw)u57-o zwhlvow7m, at a constant velocitzwh7o-x7w)5 vqwou l:y of 0.50 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 of 5500 N fo )qlpl5ey.tha(atc;)r a distance of 50.0 m. What is the work done by the l(atah 5l)eqtc;.)yp 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 5504 h yr7r 21uac ;4zwtkn+1orxn0 N for a distance of 50.0 m. What is the work done by the weight ua;17x co2zwr1 y+hr4 krn 4tnof 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 pcf kx9 9r0hl)8mqpkr0ulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net wf9k00lrpk xc8mqr h)9ork 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 al7 spa1e zboq v,7dpfbw(6:r5:d umxc-ong 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 frui bz+dr/l0f5wcj -xtf /t slides 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 sister Sarah in a sla)gejm20wu84 y 8f k9nc9jnsl ;sa3sned on an icy surface (assume no friction), with a force of 60.0 N at an angleunj0n s32ca9mjk4y8sa fenws g;98l) 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 objecdwg pq zliqp9-cp.,s4)v80 qvt in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's posi- p. zdc ppi) vv98,qsg40qlqwtion. 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 force. Theh3qt846gnjvex xz. . y;t94gi e.u rc fulvx+/ graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from c3 h9 / 4.gr6yj nivxzu+;8ve4le.. xfxgqtut2.0 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 n cg8d /ow+b(cdirection of the force. The graph in Fig. 6-1 showsog/ +c cnd8wb( the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. 6-k9maf(; nikdm q;*u9f1 shows the for mud;i*k9 (fnafqm9 k;ce versus the 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 movvzianqs;.* j,e a 55-kg cart (initially at rest) across a 10 m level surface. Wha sv*j,;nqz.a it 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 appvqp(-h/ zs f22ef) zgblied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed o) sz/hbgve p-z2qf2f(f 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 ng9w kheg8 f66 7wn2lmwork is required to stop the mash2mlf6e 9gn w78nw 6kgs?

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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 v6a9m ;vuelc)reb+ c /car initially moving at 25 m/s, what distance is required vbuc;rce elva+9) m6/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 gun propels a 10-g dart. It is cocked by exerti 6e,y+qz8bp1pr+e jjk 3buk w6+aqoh. f8-jj png a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the swe+arjp++b8 , jkb-uyehp8 1of.k36 qjq6jzppring 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 oh0fn,hn6 i e2a5/6 xeq2g(jlq(xlkd80 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 fromhqj(6( oi,lqn2ehnx/lg6k 5x ef20ad rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizontally into a bale of hay, striking v;9-(1 y hp+ n7vvvpx lagkc7mthe hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on thegy+ ;7ckv9 vvxp1v(hl -np m7a 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 toi9*kop 5tvh(m a height of 13.0 m above the floor. What is the change in gravita vh 9(tmok5p*itional 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 long ai /9stv),lm x+ dkvq3byxe8h)nd rises 2.0 m. If the plane is frictionle)klv)3 9 xbt+mvx s,/ dq8eiyhss, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cmldc b(d/isc 4m ra l9iu;jn913. What is the spring consid 9;l3d(4c1 / 9bmlcinsurjatant?

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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 mcdwaogio0 p 5(q+ yg3ug:o ++h/.ls jguch potential energy does it store, when stretched b5. 3+ y(gg+gloio0o/cj hdqgspau:+w y 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 initiallbqk:d8l om 1mv l/f,w1* 7jjafy uncompressed spring with a spring constant of 25 N,* kvwmmfd87fj: /llo j1ab1q/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 fz 1jd24 ama;mN/m from x = 0.20 m to 0.25 m? (Assume the unsmaf2 1mazd4j; tretched 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 initiala/ he0t 7l7oodm9l4wmr5 co8jly compressed by 3.0 cm. How much work is md7mwr/o40oc 5 alho97 te8jl 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 hig *, egu6;l6v9r:jauc 9oifou3xce3ss h slope. What is the speed of the slier on reaching the bottolu3x*3:e ueirss 9,a6ojc o9uvg;6fcm 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 w25t yjnu70txpeep4u :-vp 9m kg, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dm74 uee 9 pxp:tpw5y0vn- j2turopping 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, itar cei,;(r)yf fj236 j1 lgfpb has a speed fljc;yf1gj 2i) ra 3 er(6p,bfof 9.80 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 imj z/t7e0jnky 8 6i5kes 0.70 m above the floor, its potential energy exactly equals its kinetic energy. Howeeij65z0m yt j7/nkk8 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 from ground levq90(qw )yuhuqel with a kinetic energy of 40 J. At the exact tow)09 (qqquyuhp of its trajectory, 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 gro 7xyt4/f(ua z0vpvvn) und with a kinetic energy of 220 J. At the hi pa)un vzxv7/ y(v4f0tghest point in its trajectory, 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 45 m above the botngf;( 7f8ll netom 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 dipl ;ngf( 87lfne?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the bovf ;e6/;sg9lxpr6dt8xkj;kx 73iaj q ttom 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 mtpksx96;36kdf q;v8;lx gi/7aj exj r 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 th1p+qlq nkn*mol f jio-;g1k+1 e 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 of the po1k mlkl;j*q1+-1qnf+oi n gdip?


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78#
 
  What is the minimum speed of the ball at the bottom of ik35op od3o dhap1;x3lo g; hc g3hm0n+g2on y4ts 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 58 sr mnvlt*)5a0 cm is pulled 30 cm away from the vertical axis and released from rest. Wl astmrv*85 n)hat 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 horihph 79 kj m92 1o- p1fp2tysyyhn.cqk-zontal spring with spring constant1h22-tpy-h9nf1k kyy9qc o mp h7.spj 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 carz k4 gm.6xzumu8j8ao a8p wo2+w q(ye;3u/mzr to stop for a red light. What work is done by the fricmkgu2a8; +yzeprzx uowqu38m m4o.6a z/w (j 8tion 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 di fxv)k4o /rtb;96 e o7si 9rsph*a5qobject and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will iti )s7eo5k p4hbrti/ osa9qr;9xdv6f* 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. It has 24 J of m8o0 64i.m aix ,zuyvjkinetic energy. The friction force on it is a constant 0.50 N. How far will it, a8o6vxu ji4m.0m yzi 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 horizonta xhf61 g1 7e1g0fezn;-af 1cc-g ttkyilly to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass 1h0 fge7ftxz6nkefc -gcy;ag111ti-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 re,k1: s2gvv rn4iulta (af324a)ol vzast from the top of a 50-m high slope. If the work dog2vaa ni 43l2)zvvoas kftr4 :(,1laune 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. The plan8) nj1 .n*emchf(sz dqe is 4.0 m long and rises 2.0 m. It requires 38f s h.m*enq )ndcz(1j200 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 planev;zh) iu13mc bmwms7; 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 sliding 4.0 m along thwm;b )usvc; m1imzh 37e 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 tlr, /mht ul49 9quh3btpmp 3+of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frictir,9up493l + htbmtmhp3 ltqu/on 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 ofah1 tkt+nb 6a 0i)zgn/ stairs 10ian )/azbhn+0g 1 ttk6.0-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 constant velocity of 5.0 m/s.5uv /jotvm.4jb,+ 5vg.gi orx What power must be,/v .j+55v uivg j.ogm4xr obt 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 rqr.mez: c f( cpwq0v:0uns for 1.0 hr? (1 hp = c:: fvcwe(0q qm0zp. r746 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 ap x+ix /*c3cju1;actlt the rate of 500 W while riding. How much force does her foot push with when she is travelingticx ;aujc3/ c1x*pl + 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 avec oglzr x(x;;+rage power delivered by the engine? (1 hp = 746 zrocl; (+ ;gxxW)

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