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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 xruu gmz7ng. b5t9:+ wunits?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if there is no n ym 8480s kwkohaz52ymotion?

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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, thec ))e re2ftb2e amount of work you dorfce bet2) e2)

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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 gok9ok010q dibeing held there. How much work0o0kkgio9q1 d is being done in 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 flp tuv f(+ht40q1jvj(b2g gm;z kl71corward at a constant velocity carrying a 10-N object, the amount41mhvjb + (c0l 7g tj g2pzvqk(;flt1u 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 l09 kdeb: qmlerv8*0vvifted vertically 3.0 m then returned to its original position.0veqd9r:e mkvv0 lb8* If the 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 2ftf; p1 23j 0nl;azdxe(ij nsftg2 4hforce 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 the sign of the work d xw-0hgkhz 3w7ng5x:ione by gravity while the ball goes up w 5iww3znx70 h: hgg-kxith 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, oan330k3o fomlu zr ni6l p::3jn a Force versus position (F vs. x) graph, represents i3ro n: 3umofn6k:azlj303lp

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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 vk1j7 ( *j edcfd;xsyi3s. x), what represents the work done by the force cd 1k; xsd(3fji jye*7F?

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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 o7jyo:uf a;e u.bject 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 amu/ndh 1 0xs8ln object 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 objec / yvmrmg5p9 p6xd*r3jt 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 as much as a car, and is moving at twice the speed oh;iwhezf 2 u;3mtw)b: f the car. Which statement is true );fbht2weuzmh3w:; iabout the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of car K. 4ft4l3rh xmr qs.m,w4 The kinetic ene4.wm fm3 qrh 4lx,4rstrgy of car J, 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 spmx9: rc i45o w9pw2fyc*nu:ipeed. What is the ratio of the final kinetic energy to the initial kinetip2wpy9 u :5fw*ci4coxr:nm 9ic 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 mov+8ha kx-r uvn35ld13 7elxk riing at a speed of 5 m/s. If bov r73n+e - rxulkxdh5k 1ia8l3th objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed f; fvvlz ;klbk-qbd.6 l *:rqajbr8/9 2.0 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. W-;a/fqbbr9 vlfr zq;:l6k*.bkd 8jl vhich 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 jy9gl)g +teb b d*mj((your car in a panic, and skid a certain distance on a straight, level road. If youjb(9 gtm+ )*(yjelgdb 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 Sul;jj4z557jjxrb c6lhl t) n(jyy +m.z n in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinet.+(rj64h7zljyj xmylc ) 5j ;jnzl 5btic 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-energyh(l sob2*v.0 ct87b+owhfqxx principle.
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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 podv sr5canzs m *;7r4 3q;afz1utential 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 grobj zaa4mm) /-s1r5 kef8ofjn/vw b :v/und. A second object with four times the mass of the first if released from th-:k f)w z jarb/evo5mbaj1mv84sfn/ /e 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 -7vjv4ax+ g mq44aslhs boc 8:causes it to stretch 5.0 cm. If anov-4 8bg+l4s x4aaq:hjms c7vother 0.200-kg mass is 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 energuotmnt4 t62 yv/6nu.wy 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 ene )d0oz23t/v1 mc):fd rpnnwzhrgy K, to its potential energyw:zrvf)2m) pd1/ dzh otc30 nn U.

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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 driadm: d 699:l .fzdywueving 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 slidonsb1b s4qt1o4k h50.)aleuding with equal speeds along a level frictionless surface. They both slide up the same frictionles d1t sq4lb0b oh)4ous1enak5 .s 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 cc+j9 ttyk ,p;$m_{1}$ 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 comj1q bl) 6mqilg 8ed2(i4va2fnservation of mechanical energy for conservative forcesdm bjg2eq )ql6fi 182l(ma4vi.
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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 topzo h(v kc;uqce0k9/ h: of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U)(hqc90;ozkkh/ucve : 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 ignoreo.ycq3t9 it*ge4wph 1lz+df2b* w0crl+-pyl air resistance. How much gravitational potential energy did the ball los2l b0ec.3yqpy+tlor4 +if*ldwcg p z*t -w91he?

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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 gramtcd g;v. 3c+avitational potential energy. Do not ignore air resistance. How much kinet 3gcd+; vma.ctic 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 j.br wwv7n(c8of 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 isfnzcc7, 1+giji:j ob /

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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 expressed in SI units?vr 5 1uk*tt+x k,sq-fp

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unit of po ; ya;*ocykbu)wer?

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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-tp(j tv 34cw2yp6cft* ohird the time. To do so, your power oupow3 tv4cyt*c6(2 pfj tput 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 acceleration, the car's engine mustam/1 .qjn lvo1

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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 objexz1wj6e; ; zy n*j0vwnct weighs 90 N, how much work wasenx zw6w0 jn;;1vzyj* 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 m, at a constyyj:iug7ozj yk) r3cz. -1y1:7akbbsant velocity of 0.50 o.-1y3bgju7 :srzik )7 zba kcy1y:yj 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 constan ur+dvdsbt+. jd7-h 7st force of 5500 N for a distancus.dd rsd7 - bv++th7je of 50.0 m. What is the work done by the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant forceuog n a59drt:gl*/ kk3:nv nq4 of 5500 N for a distance of 50.0 m. Whatgaun:n *k3vn :4o5grtd9k/ l q is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a conssn++q+b a) sivtant force of 5500 N for a distance o ++sbaqv+si)nf 50.0 m. What is 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 pulled6cafr/g)1x xf6 ol /ti 6.0 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,lf 5g;9ionb m76xlyc2+o dd,q 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 Sa8vw aqh3rxt0w3 iz//om4e/pi7fm h-wrah in a sled on an icy surface (assume no friction), with a force of 60.0 wxohf8 aem/70zh3im /4p-3 ivwrtq/w 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 objelh2)wzs tnbc0s:kfs 374zcu2ct 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 02wb37kzhf uzl0t s:n4csc2)s 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 gr7)d2dob16cxqs8 sk qha: d6jdcn* je 0aph in Fig. 6-1 shows the force versus the object's poss d0shx2j7 6 cka6 jqnc8dd*e1ob)d:qition. 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 gra5;vrf(rqcmw+z h0r +zph in Fig. 6-1 shows the force versus the object's positiw0mz;rr rq5(+h+ fvcz on. 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 tkhqpkfb5/(fy z ce0 )ovx3;/bhe direction of the force. The graph in Fig. 6-1 shows the fb3y;)5kkfo ( qc/ xv0fe/hzbp orce 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 move a 55-kg cart (initial1mle;mj t g89a (1chg/7spwvcly at rest) across a 10 m level surface. What is the9j8( cs te1hma1mvggp7cl; /w 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 (ini( m,/e-r osmg(m7snmkbs9 l9ztially at rest) across a 10 m level sursrlb7e/ 9((m9so-,s zmn kmgmface. 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 apw+qv6) h) ia joilfk-wt3/0v speed of 5.0 m/s. How much work is required to stop the mastw3l)qv-0 jia)/hokiwv pf 6+s?

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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 m/r33z0 vgs tc6as, what distance is required to stop a car moving at tvz 3r0cs 6ga350 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 cyt60pxt kt/1 focked by exerting a force of 20 N over a distance of 5.0 cm. With what speftyx/06 t1tkp ed 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 anf08. 7rxjj:tbvx6 q z vertical component of 60 N. The force is applied to a box which rests on a level frictionless fq:.6x0xr f8n zj7 jbvtloor. The cart starts from 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, strikinga eaf :wrr3o4al4xgj/ 4/ig, r the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm befor4:r ,3gxeag// r4ofaj4wrl ia e 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 ri7q2cp(qjr9 .00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential en2pqr ci7jqr(9ergy?

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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 inclined2slxy 1r5d o5y plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how m2xryo ld 15y5such 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, cause7w/ dbt*vu;xl s the spring to stretch 2.0 cm. What is the spring c 7 tubv*/dx;lwonstant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring constant of 60 N/m. How much potentialu/t.y z5 yb(lpyc4uih6 w9sl; energy does it store,uy/6h.5u ly lw; (tyci z94bps when stretched 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 requ ;r aev3k+d* nj)u7touired to compress an initially uncompressed spring with a spring c3r)javn k* 7;dut+euo onstant 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 stretcy* hvq75z 4t4ju nz;mqh a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched po5m4qqn;j*y zvz7tuh 4 sition 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 6mdo vh yf)m**sdp*26xq :sm lN/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 qm hymldm* s*)6 v:ofs x*dp26cm?

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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 sq/ca3j0 klvq0iji 1/j(d 3tp wntwzq,9lg9 5 is the speed of the slier on reaching the bottom of9ncj9/q/ gs0 lv p,j(kzl1 ti3q3tjwa50w dqi 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 isx(il9o* o3;+fzf f jdq )vj/snitial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevatij+3fd;oqj*9siflsfx (o) vz/on?

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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 frici92:t*lfczb hzfe+ x9tionless inclined plane. At the bottom, it has a speed of 9.80 m/s.tex h9fzb92fil:z*c+ 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 f7 ya+yrmm, o0the floor. When it is 0.70 m above the floor, its potential energy exacf y0o,rma+m 7ytly 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, weighinibxyu1iv9w1,793gd tfo k 6 pjg 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical heightkiwv 1 937u, poxfbjyi9 16gtd 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 leyfg 9aqb7xu8a s34167cawpbpaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, rel78s76a 1bp bu pcqyf93 gxa4waative 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 starts41 xtcch5ns agqni ;n8w7i26q from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller cg t n8n2h 4qi71c6x5wcasiqn; oaster 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 a point 45 h45duwj.eeda4 j( f7im above the bottom of a dip (See Fig. 6-2).j.7d 4ujade5 hi4f( ew 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 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 the bottom of a din(6,wp ma xqo0yu87a.a mpsv9p with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what wiq(0ox ay.p pn97mas ,u8m a6vwll 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 bottotrz1 3yx; ywe r)qd/;4+da qram of its 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+2 *n7i0h7lk hiqssp z zexn:2 pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom sie:i+7l*h7nxnphz 22 z qs0k 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 hdw +:x rybg9-iorizontal spring with spring consyd g +x-i:w9brtant 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 car to stop for a red l, w wzfgy5g-*night. What nz,-y* gg5fww 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 becowxrkw7 s239tween a 60.0-kg object and a horizontal surface is 50.0 N. w3x72sk rocw9 If the initial 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 surface. fbybp56 y3 oli/yx +m7 It has 24 J of kinetic energy. The friction force on it is a constan 7oibbml365+ fyxy /ypt 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-ki. itba i./y;ig mass on a level surface. The coefficient of kinetic friction between the mass and the iy/;i. aii.b tsurface 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 hizjqwxl1 o r7 0jpx .2av 7muf0tpw6+c/gh slope. If the work done by m7wr/wofl1 xzu capjjx6q70ptv . +20 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 planegln4srdq2 , 3cek ho20*eot2k. 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 the plane. What was the magnitude of the averh,t 3qn402cglereod2k k*s o 2age 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 releasedu hgymbg;a,) l zo(9b2 from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and thmylohz;u, ab9(2) bgge 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 grounu+euk0384 gwny wz3nmd with a velocity of 7.00 m/s. What average force of air friction acts g0 u338y4wmnewz+k un 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 60.0j:az2tb fez3e x18f.i-kg boy using energy when he runs up a flight of stairs 10.0-m hijtaizx .ezf1f23:8eb gh, 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 velocmk gg wrr58 r 7vmlt:*,atfx+kx,*x s.ity of 5.0 m/s. What power must be deg7r lwavx,* kk*r 8 xx5smf.r:tm g+t,livered 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 5sig34.za v 5sn 6xicfare used by a 1.0 hp motor that runs for 1.0 hr? (1 hp 3i 6cxaz5ss45.gi vfn= 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 Wb 0wt )69sv6uoei vu/3*(wew 5 vxwwrs while riding. How much force does her foot push witwt5v(6ww*w9 /6vr uei)x3s wbo0eu svh 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 s. What is the average po-. oda,oy17jbfn hd ht91rko2 wer delivered by the engine? (1 hp d2k jtr9ho f17ado , .1bh-ony= 746 W)

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