Physics Unit6: Work and Energy - 题库网 (tiku.one)

1#

What is the correct unit of work expressed in SI uniod,cexs fr z+/.pbnric 0w ftx:(u-+-ts?

A. $kg m/s^2$

B. $kg m^{2}/s$

C. $kg m^{2}/s^2$

D. $kg^2 m/s^2$

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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 t/d8w mt9,cpm 1ns x*fxhere is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

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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 stationarydh 5 va k.4,qfkl*tw:w brick wall, the amount of work you ,45dl qf .*tvk:kwhwado

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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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 mzbw );bk6za .e5+sxobeing held there. How much work is bebaz+b.w)5mes 6x ;kzoing done in holding the box in this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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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 cx*8t(lr poj5b -ti8 muarrying a 10-N object, the amount op jtu8t(5rilx8m*o-b f work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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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 then2n6)p usf )c16nn jdbn returned to its original position. If the total weight is 30 N, how much work was do61jun6 p)2nbfcnd) s nne?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No 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 acting on an object dpl1b 4k v:ezpkm o(i;:o work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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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. Compar:olhw;7f zran gkvf0p+( -/ rue the sign of the work done by gravity while the ball goes up with the siv; f7ral gp/o :wu-nhz(k0r+fgn of the work done by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way 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, op (i(hac +)wgk13pq-z pbiw2 un a Force versus position (F vs. x) graph, represents ib1(uk-gzicq+a(h)2pw ppw3

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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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 the work done by tcxeg-4w/8 xn unx- gx4w /8ucehe force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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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

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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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)qcse ) yxal8 w,-douf6 0gap object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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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 o1:v(tko y ujvdo4r8o w0em- n,n an object is negative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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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 blr1 v-ll.dk)y nk 0bz9j+f7gthe object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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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 a c7, i/-9 zfpmjybcbgkv2e5(nt twice the speed of the car. Which statement is true about the truck's kine jcenmb(,cif g2vpy 5-7zb9 k/tic energy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy 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 carlze75 m 0j010bazmzkf K, and car J has half the mass of car K. The kinetic energy of car J, compared afl5mbez0km7 1 0 j0zzto car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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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 andp*0utczshk k7k ucvzjsozp1*74 ( l01 bounces back with half of its original speed. What is the ratio of the final kinetij(*sk107c c7zv ktz *okulzhu0sp 4p 1c energy to the initial kinetic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

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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 ofw scnln6,8b 7f 3 m/s and a pebble is moving at a speed of 5 m/s. If both obje,67wlf 8scnn bcts have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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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 movingwscsek )* u/wr.u19bu with speed 4.cu1bu *s9r e)kwus /w.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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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 dista8ru b1puk1(uo-fzfp1+er ( pj nce on a straight,pj(urfu1f8bzu(pk+1-1pr eo level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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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 xixup9 g8qr:,an elliptical orbit. Neglecting any fric:qu px,i9rx8g tion effects, what happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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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.er3*g r l6 1d8yqwj5bnb o4:j:gvj d4k

该题自我估分: (必填) (满分:1.0分)

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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

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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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 a4eysqj atv) *, system to have negative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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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 ground. A second object wizyki 39y5-l.z sm4hk amh0py.vi0 6gz th four times the mass of the first if released from the same height. The potential energy of the second ob39yzkks5i zymgi. h- zm4 lv0a6 0h.ypject compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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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 enh gc*1on+(*c6yxk bgsvc :f4 ad of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy (6kf b:vc*csy+n41oa ghc*gx of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a systqrp3od)o3;7k f0elaq 5lg *pvem

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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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, ,p-i7w+n6x*eq kvtqn to its potential energy U.ni -x6p7qe *wv,qnt+k

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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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 drb,5 rhhvu;+knp0u( ju iving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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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 kj9 wx6 s0hl9wdui 9.lheavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rwj0w99 h 9.slxku6dli ises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses ytai;xy41j/l iru ( -d$m_{1}$ 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?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle ud3hbn*d0,d7p p q.wqof conservation of mechanical energy for conservative forces3 w .*0qpqb,dhndpud7.

该题自我估分: (必填) (满分:1.0分)

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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, throughg p w1*m j+yphig0**ooio u.v+ 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) at the top oo*oyp0*gw + g.hi 1*jov umip+f the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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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 k4ww;0p 8 fq,fmn7mgvsinetic energy. Do not ignore air resistance. How much gravitationa 8mw0 w7; vqmg4f,spfnl potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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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:slazr.mfxu 7o, 2b j. and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did of,:bl.jsz7x am. u2r the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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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 consf2*bzbi fd at7*pj:)v ervation of energy.

该题自我估分: (必填) (满分:1.0分)

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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 isyfd3ax h8(f84ewdz d 8

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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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 exprl )d;s 2xh)diwessed in SI units?

A. $kg m/s^2$

B. $kg m^{2}/s^2$

C. $kg m^{2}/s^3$

D. $kg^2 m/s^2$

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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 ak.edr snul(6sk l79.8 ydrnu+ unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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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 the tij 3 ua o*ndb4cgf/oqs+/2f6gime. To do so, your power output must uq bg4fn*+36oifc/ a dgo/js 2have been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your ced9;, krm3rnq ar at a constant acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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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 t6ow3irr5 pdj;pqu: 6phe object weighs 90 N, how much work was done in lifting itqrpuw:j 5 3;oir6pdp6 ?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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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 const06osdqbt8c3hg7 rk .rnl 8- pgant velocity of 0.50 m/s. What is the work done b 3lts08 c8ng rqpogrh.kd76 b-y the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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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 wi. - yi)jcch6xuth a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N f-iu hjc6x)yc.orce?

A. $2.75 \times 10^{5} \; J$

B. $-2.45 \times 10^{5} \; J$

C. $3.00 \times 10^{4} \; J$

D. $-5.20 \times 10^{5} \; J$

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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 oopztsdo1 z))-uwuh sc /8v+3pulled upward with a constant force of 5500 N for a distance o )hotwo z 3sdsu1+ uovzc8p/)-f 50.0 m. What is the work done by the weight of the elevator?

A. $2.75 \times 10^{5} \; J$

B. $-2.45 \times 10^{5} \; J$

C. $3.00 \times 10^{4} \; J$

D. $-5.20 \times 10^{5} \; J$

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 .m.kl 7v sxgs+fu8,.l wktm2d N for a distance of 50.0 m. What is the net work done on the eleva7 .m , u2t+v8s.ms.glkdkf xwltor?

A. $2.75 \times 10^{5} \; J$

B. $-2.45 \times 10^{5} \; J$

C. $3.00 \times 10^{4} \; J$

D. $-5.20 \times 10^{5} \; J$

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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 6.0q tun2*q,dejc5a ; z0h m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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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 fruita 78tvb+g(da,spyb 8m 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?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an isj*6,i/v n yumcy surface (assume no friction), with a force of 60.0 N at an angle of*,u 6mi/snjy v $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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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 dir x,)n3)5 9 dwsgjorxfiection of the force. The graph in Fig. 6-1 shows the force f5jo,)n sg 3x)i9rdwxversus the object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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 objeczh) ih.o :1t5s5x exdbt in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work ddoxx5s ) 1: hhzbe5it.one when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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 objec t* jlr4h0g dr+wil;7et in the direction of the force. The graph in Fig. 6-1 shows the force versusr;j drlw4h*t7i+0 le g the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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- 1q x2suox (vmqk/:jb61 shows the force versus the oj 1:x(vok2ubqq m6s/xbject's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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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 caro1 z-vzicdxuuubv0r i di;q28r.)90kt (initially at rest) across a 10 m level surface. What is the finald1orir 0vib2diqx0 zz) -8 ukuuc;9v. kinetic energy of the cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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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 (initi -upgs+2i(xv ,spwj-fally at rest) 2 v-fug xss+pp -(jw,iacross a 10 m level surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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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 movi;ab; :-lf vugdp) qxa0ng with a speed of 5.0 m/s. How much work is required to stop -x: qubv;)0lp; adgfathe mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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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 movi4 vga;cebm,q niv3 y.5j p,8isng at 25 m/s, what distance is requirj,m,snv;egp 4iya5c b q3iv8. ed to stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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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 as*rk aaw +c9)r+ k7ok (u7;eeyv sr6apropels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negw*aa e77csorkak sr6y );kea uv+r(9+ ligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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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 compw: ubrq-*tm ,ir:*ym vonent of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2i-:*m *r:umvtyq,rb w.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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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, strir:pbc j.kt.ugp4-bp + king the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What iptpg +c:4 r..bp bjk-us the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor to a ma0w,x)3;nxa qx4.fm qs5jbj height of 13.0 m above the floor. a .m 4fx3xq;nbj0 m5jwq,x )asWhat is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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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 tn 0j+hnb6gmds2 jdf be (x-2v5(iz 62axrk4w 4.0 m long and rises 2.0 m. If the plane is j2642xwgd6nvdbr mxkaz(2 f+in5hjb et- s (0 frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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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 stqvhu,- lz1 yo:retch 2.0 cm. What is the sprinhyu o-l,v 1q:zg constant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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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 mus+)9p h2eohn sch potential energy does it store, when stretched by)pe s9h hson2+ 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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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 initially uncompressefwpl p6.f/c 2td spring with a spring copc2t/wpff. l6 nstant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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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 x(ipm1vvb qg-:/wi ;r= 0.20 m to 0.25 m? (Assume the unstretched position is at x = m/v: gv;i pxi(qrb1-w 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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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 ini1*wth/lg*-ju56hbn t cya sk7tially compressed by 3.0 cm. How much work is required to compress the spring an additional 4- 7c/ hw*5*bsknyt lt h1agu6j.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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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 h0acua6y6w1evfdi5 l vv-o7g + igh slope. What is the speed of the slier on reaching the bottom of theeyv f6w+a1c65lvva07idug o - slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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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 spoox;gsfku(m /svs3yi -k r4b,-: j*oaeed of 4.0 m/s. Neglecting frikjso: -s-y3k;sr4uobxm, ig /ao(fv *ction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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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 frictionlessmumyosf(.p*lx1ui4 8 inclined plane. At the bottom, it has a spee8. us4l1(i xuymmf*op d of 9.80 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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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 abovo3qrjkktgdpt4zty1ki:-)j6b5ju4 -e the floor, its potential energy exactly equals its kinetic energy. t1 j t3 k4:bzg-y) tjdirjpq4ok6- uk5 How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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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 u5r-2:ndest awkd1) li+1m ts 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its t )e+5- adi1:mud 2nrl tkw1stsotal mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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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 ground9zu(fn 6 wxs sa:brw7j- 1pk5j with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its7wu9jxpsa (jf nk-1:5zrb 6 sw launch point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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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 47 x4t 5jnt+ (a:c; byu24ca blpd3uubd5 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 the7 cbuaalbddp4j( 35t c:xy t ;+b2u4un bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster start;z smvb2k3py6s with a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). skm;32pvb zy6 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?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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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 :l :q8bxe psknx12)kv2)98hgau hhcv a point 30 m above the bottom of a dip with a speed of 25 m/s (Sehxh:kpbx n l182q:c2 ev))k 9uhasgv8e 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 dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed ofv ow: n-mr 3sts3y8s ;bj ur9u/nm7a+f the ball at the bottom 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

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the vertical axis and relea5j3g332yi mh-s nafxasem a3-yx3 h jgi53nafs2d from rest. What will be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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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/ xv/4tfn;w gqx4x/u a5s hits an initially uncompressed horizontal spring wi /qv44x 5x/ng wxafu;tth spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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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 fod1 cc;eupjtmb(,;k( k -xxl7mr a red light. What work is done by the friction force against the wheels?dkjcmcx(mp 1t ;e-u ,; lk(bx7

A. $-2.2 \times 10^{4} \; J$

B. $-4.4 \times 10^{4} \; J$

C. $-4.84 \times 10^{5} \; J$

D. $-9.68 \times 10^{5} \; J$

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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 anvr9p6to36ih6k cpm 5ls7y t1hd a horizontal surface is 50.0 N. If the initial speed of the object is 25.09py ocp376 t6ks t6h5 iv1lrmh m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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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 kineticw p,0mrkthu,v9; 6drd energy. The friction force on it is a constant 0.50 N. How far will it m hkrd6ur p0dw; 9v,t,slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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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 qpbj;kukku.gxy673hii- o d 3u79j 5qto a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. 53i ;quoj7i6gdqk-9hy3u7kx. pju k b If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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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 n 7bd; m.ae1citop of a 50-m high slope. If the work done by fr;7mic1 . nbedaiction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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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 4.0 m longomp bmz-++d0u 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 average friction f0umopm-b+ zd +orce on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 2 )du;(axwzc/q7b /smg0e 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 the pla x(;/qzmwag )7u sd/bcne?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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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 hege(qi;c-gx+ : 1agjv +76kbqk fk)pceight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts o kqf)kkqeaxc(-+ j i+7ve;bp g16:cggn it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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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.c) b du.nv: 2lkhra)p;0-kg boy using energy when he runs up a flight of stairs 10.0-m highl)crva:d.bup;h2) n k , in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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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 j 5lv8jq4/otveg 4kp-move an object with a constant velocity of 5.0 m/s. W5/tvvjqo8k4l e pg j-4hat power must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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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 exs): ay6q8kyr:yko4b nergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 qso yk: :ayk8xy4r) 6bW)

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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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 wqjtkz097 as +o +j-ldriding. How much force does her foot push with when she is traveling a+tj-9l0 jqwok7d z +ast 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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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 accelera4-ju ) 4qx zn g.xiejm+3g4gpbr q-q/ktes from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engi gn/)gp44u xb-e4-qqkj.m+q z3gr ixjne? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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