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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 */wcjk/zps )b)qtl:8b 1hdzrw )*yvoof work expressed 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 i:jku +p(7 xcrckju.8l s 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 y7/w/ s kahen6hard against a stationary brick wall, the amount of work you don/hy w asek/76

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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 is being held there. How muc (:abhm ,:tyn3e qqar*9t ub.eh work is being done in holding the box in thi t9urn:e3 baqq:y(aeh,t*b.m s 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 constan1zimbo:or5b oh- zs 7w 4l4r-tt velocity carrying a 10-N object, the amount of work you do ib r: 1bz47io-o-5wlozrt 4msh s

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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 returned to 1b;3d(m6 lu/urd,i*g e oh)x-rjfl yvits original position. If th-rrf;bd3* jl6idogu1,xl m)/vye h( ue total weight is 30 N, how much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acti7 *q7ge q5ulwrng 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 straig.u fvxdx b2j h/(v afte*kt2+,ht up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done byv(b2,jxt *tavff hk/ eu.xd +2 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 pbnk26 /npfy31 nz(j3t5 ; p 4ol hdlwrdhxhv+3osition (F vs. x) graph, represents23vonpddty; +bw3phr( 64z1kjl h5 xnlnh f/3

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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 represenj w8spo96+ 3shj8qcgouwoh/h 5+m ku6ts the work done by the sow u3s98k6+ho6qp ou/mch85jwj h+gforce 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 positp8sc jsd4ipqxa68 ,q 7ive, 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 object is ne h-jl wxcu/z)8cp 40kd93 bzxwgative, 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 1e.i6lyfqj/d m bb*w(, then the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as 3 f t5h)i5dvnkh0.ih ea car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared fhi i.vd05t)3h5 hkne 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.8+ 06qebzadg f The kinetic energy of car J, compared to car K b+ z86aqedfg0 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*4fi1kv rryu7 its original speed. What is the ratio of the finu4y fv 17*rirkal 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 . q9pd n2ig8u6)a x1qzsd.lts is moving at a speed of 5 m/s. If both objects have the same..sgaz q1u2l)6s9 idnqtp8dx 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 moving with speed n: ;)cgsf wd.lg j-.ko4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stoppinj- gnc)sw ;d:. lfg.kog?

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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 distance e:cvu4z 2q(z( 7vat8an znl1lon a straight, level road. If you had been traveling twice as fast, whznlva q(an:z 7c(lz 42 t8u1veat 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 orbit.xrf-ea v vl9/ bt3-gbaoe *f,s:v:oy( Neglecting any friction effects, whayov b:fva va:-s3/(f-gr ,9*eb t leoxt 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 principlen 2oo7wmlf:/a 0eipc lh+t-e,.
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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 potentiq.k a2v9les-k al 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 fromlxu((*2ry n lt;38 qo+aeqixn rest a height h above the ground. A second object with four times the mass o;8nnx ulao3xe( r*qtqi(2l+yf 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 attached to the end of a spring ca.4sqas tl2p9edso. d7 kk-p(t uses it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring 4q9ksssk tpl2oad(7 etd-p.., 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 ayleb my+7t9s h3mb w2( 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 itfaq.)gb3w:*cj; rl k cs potential energy U.*kbc )a :jl.3crwfg; q

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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 af9 p51.u0qfly 7c oi)udx 6lphill.

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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 v-vgej* xl5w: )nvo iu-u zx877vrb f*((wvpvqery heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greate* irel8b:)qx-w(pu* vw vnuv 7vxz vj(-gf7o5r 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 . r5,qrmwhocmb(b7g 70d*p4 iworul-$m_{1}$ 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 mechanto-qm+john hko6 v9;( ical energy for conservative forces.6t ; (j-9ohmoovh nq+k
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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 buildiouut.zqqyg 1:g++h 8 wng, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just beforeqz+ t1y.: +8gqhguwou 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 kineticpm pgd)p s s.7b0(7.-qsxgpmg0*zh eu energy. Do not ignore air resistance. How much gravitational potential energy did the bmx q p7ssgmupgbe(z0ps. d-gph *)0.7all 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 gravitationp6 4u **7iy j20gesalz ye) x1x+ rcji97dhjsqal potential energy. Do not ignore ai79 lhqjs )yr cj+x*1duzaie xiy* 26 je47g0psr 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 conse6wk5k m, er-g ar;;b3 v:xftqprvation of energy.
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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t is/7 ui) gaahg6 -gi+-bs 2rlhsk

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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 expre)mc5a6/u c+ns ob .inzssed 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, whlubx 1 (07wv8oxu af0lich 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 e *34ascptv a5one-third the time. To do so, your power output must have ea vpc4sat* 35been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your c vq/c5,y1jozb4 rbr++dy/ oh mar at a 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 objp2bsvx ih c(qn2v6b 02f83nnaect weighs 90 N, how much work was done in liftb2hixsbfn3q 8n vv2a 2c(0n6ping 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 4 1 2g-yco 5cdlzr/swrdistance of 1.0 m, at a constant velocity of 0.50 m/s. What is the worzow4ys 5r1cd lr-/2 gck 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 constantztc9 iu h*l,s7 force of 5500 N for a distance of 50.0 m. What iss, *icutl zh97 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 upward with a constant force of 5g8zxc+ec-w ac)dxlqwa*(2o5 g8 0 enc500 N for a distance of 50.0 m. What is the work done by the weightw8x5on+* e-dc a2 xe)gczqc(w a0clg 8 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 7esf p.vwme qe0ke0r6*oi59p force of 5500 N for a distance of 50.0 m. What ivrkf .o7i9emw*0es pqpe06e5 s the net 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.psn/1 hd.yb f+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 down a ramp, inclin8y/ nvb rte,j;ed 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 siibzi 0(zzn z 1go 7l)tf7,vvvd8kw05rster Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle of),bz7d0g07nk185l w zvoiz zfr(t viv $37^{\circ}$ 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 Fi: :ol;u9 rr)zmc o3ztzg. 6-1 shows the force versus thor9::)tz3 oumz lz rc;e 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 force. The graph in Fik*ize,s t: 0 poiur(5ng. 6-1 shows the force versus the obe(unrpii*: kos0 5tz,ject'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 direction of the force. The graph in Fig. 6-1 yt :mxj 2 j7bxv*erlk2t5h5y 2shows the force versus the object's posit2xyl5b2yx vt* m:k jhj25tr 7eion. 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 ofxe(.fx* /u n.pukdil- the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objectu.l /-dp ukn(xe.*ifx 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 (initial0 fv2 -vk,*myz3oe 3itrx epp2ly at rest) across a 10 m level surfak0*x3mp i ve22 p-etvory3zf,ce. 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 cart (initially p*2jqolkk3m:y;lf+o at rest) pk;:3o*k ll q+j yfmo2across 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 qagoe +xb:6;2f *8v l.odspb oto st;:dgfo .v* olbxae qo2ps8+6bop the 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 carx6;-k3 wkpbh/r3jb mv initially moving at 25 m/s, what distance is required to sh kj3 p rbk3/-m6;xbvwtop 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-yr 9pm.r/:h):*)m pibnk oca1 scacz4 g dart. It is cocked by exerting a force of 20 N op 4: 1on*)kbp zh m.mcr ay9ci/)r:acsver 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,s hb(js da /6u99urpo cuk4/q and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. u/(uj pas6,9kub 9rdo/sc4hq 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, difba+x9 b .l:striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stoppxdai+:b .f9bling. 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 heig s6kp,a ;l 0zms/t6kf1rjr(nmu aof7( ht of 7.00 m above a floor to a height of 13.0 m above tpr7(okm fsam0st6u/ 16n j;frlk ( ,azhe floor. What is the change in gravitational potential energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plane. Thvjqfpba2p6mhxk6 /p * b/00gde plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by 0 kh6/b ap pbmg *v/6d0xp2jfqthe 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 cm. What is t2oqy1d4,c0.;p dl7 p q wpxaiphe spring ca7 .dp o 4pcx 1;2qipdwylq0p,onstant?

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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 consta1 (qdz1n((lif(rxm-u4 ikue *vr1l tjnt of 60 N/m. How much potential energy does it store, when streuiz(1 q4l*r(1k m1(urne fd(- viljxttched 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 iun * 8r:jel rt:bx9b)to compress an initially uncompressed spring with a spring constant of 25 N/m by 10 cmnl8r* b u) i:r:jbe9xt.

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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/b2kjq7 c2jh 1h a5:gm9e:rekam from x = 0.20 kb chjee5k: m27:a ajh1q9g2rm 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 is initially compressed by 3.0 cm. jfu1 67rdakp*How much work is required to com7 p6d1aj kr*fupress 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 1x ;vw-lakwoplv0 ;w.the top of a 50-m high slope. What is the speed of the slier on reaching the v.wo;1-w x llpvka0;wbottom 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 spee*y /qyhyuupvq60u0/fe t:u*+7b itfrd of 4.0 m/s. Neglecting frictio 0+fruu utqieq /vyythu6b*7py0f /*:n, how fast 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 u hybz2t 7 l*0wd(r3q:t;og hginclined plane. At the bottom, it has a speed olo t;0b27( tghr 3hgdqu*w:yzf 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 is 0.70 m above .zgbc krq p5jow d6ue(9l 0.b;the floor, its potential energy exactly equals its kinetic 6d zo lb.q95 brcpg;ujk0.e(wenergy. 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 from ground level with qb ..kz mc;ap0*+ ckmla kinetic energy of 40 J. At the exact top of its tra m;qck*bka.lc +z0p. mjectory, 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 gr 8j qmcse0m 4+6b:vc/h1zpxmq ound with a kinetic energy of 220 J. At the highest point in its trajectp 4 c/hx+j bm:smmq6qe0 v81czory, 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 bottom of a dip (Szf9 /tz fj(f)+o og27bn jjh0see Fig. 6-2). 7zfh/fz(no)j js 2fo t0bj+9gNeglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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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 e fhgc1e4/(ufa point 45 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 boe eu(fcfgh4/1ttom 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 ah oq8m:p7cba+ewl0w;)h i u :mt a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect fimp8wq:m +boe;)l hw07: chauriction, 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 its swing 28l kp6e;uhv:ge :xlv rmf,a*(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 isz psq v.3r6bz6kmbv9)zc h8f, pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of its swifkz6c.br9h6z8)z 3qv,bmsv p ng?

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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 uncomf-9 bogdy/v: l*lcq5kpressed horizontal spring with spriov l/d-qyb 9*gk5lf:c ng 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 2 cqod1imudnh -u5er88d /+7x f2 m/s, slows down her 2000 kg car to stop for a red light. What work is done by tq87-8d/f5 +rd d icouum1nexhhe 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 between9dtvwt- e x)2i a 60.0-kg object and a horizontal surface is 50.0 N. If the 9)-ivw dtt2e xinitial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, level sawyt7lldx. 71urface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far wild aw.7lxy1t7ll 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 tog bxn2v:8 c;nd a 2.0-kg mass on a level surface. The coefficient of kinetic friction:nx2v b8; dgcn 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 ofy 9muuw xj0xrat* ;/z6 a 50-m high slope. If the work done by friction i ru 6;*m9w0azj/tuxy xs $-6.0 \times 10^{3} \; J$, 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 planetv05d perufv92h/lp*khl- h 2. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of thehht2/d*0lf ph 5- 2rku9ev vlp 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 ok4w wlm7oo v1;mh9ebf,yyi 5-f a plane inclined at 20e above horizontal. The coefficient of kinetic friction between thy-w49eo olhf yv,mi;k1mb57 w e 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 heighdq y9 /kf60mknzi ps.2k i g9+4jzs8tit of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What+sfyizd. giz9i k9k0ts24 68/mqkpn j 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-(f+ mazj +* iof3emaf*wcqp/7kg boy using energy when he runs up a flight of stairs 10.mmf pqfz7oa3* (ja f*w e+/+ci0-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 a,xtnnp2e//gn m nw20bn object with a constant velocity of 5.0 m/s. What 2n/x2b gt,0enn / pmwnpower must be 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 l+-grfli25lte,n:2+jfa gll by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 er5ll ilg2j2 ff:ltnl +,- +agW)

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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 much force xizdb+mxl/ dc e)e/3tm)bv 2. does her foot pt//bx3il ed. e)zm bmd2) vxc+ush 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 imbg :7wusuq)k1rbn0cjmmqv:+x o0/s 5x *4lln 7.0 s. What is the average power skx0wn*0g7 b roqmu/5bu+1q vl jsl)m::xm4cdelivered by the engine? (1 hp = 746 W)

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