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

1#

What is the correct unit of w 36v rhz iqosw8*bbiir1ra0kvu*) 5e7 ork expressed in SI units?

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 i94/8 ztwxsyvhere 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 stationary brick wall, the amount oiw6gk p3 gw y0wq9,rc-f work you w p39 y-g0,wwiqc6k rgdo

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 being held there. How muchz+yx9evny1wd k 1afcc6i.v*4 work is being done in holding vfi61dw x*. ve4ync9czya+ 1kthe 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 carrying a 10-(g3r)tj epc v8ht p 911az5xs/a pabh+N object, tjtcpe )h 11pa35tba a ( gx/szv+89prhhe amount of 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 then returned to mlyq7k t-h; +29p jburits original position. If the total weight is 30 N, how h9mubq kpljt2 -y7+;r much work was done?

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 do wo )jv7xxr6/b gcrk 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. s3dud0r f5ac7zr +sl *Compare the sign of the work done by gravity while the ball goes up with the siglscu add r5*sf7 3+z0rn 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, on kgo vof7o1.b1l rcz 93a Force versus position (F vs. x) graph, representscbr1o7ofk1g lz v.o93

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 represenggna0d ;:,dyq5zgr y 8ts the work done by the y gzgqgnr,08:5d; yda 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 bos.h23 6bu ig44ofbgax jj )4object is positive, then the 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 ow22yox ui0-wu0.ac194 yij r1 fa jmezn 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 the object's xbwid 3n83lu950c cv+jv)k bvkinetic 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 movi y/g;pha/z,ac ng at twice the speed of the car. Which statement is true about the truck's kinetic energy compared a ;ph//,azc gyto 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 car K, and car J has ha0gv ,f: dow0eblf the mass of car K. The kinetic energy of car Jboe:vfw,0g d 0, compared to 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 and bouncp do cyd.t5+1les back with half of its original speed. What is the ratio of the final kinetic energy to the ini+.1dt lpcd5y otial 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*()rffx)-qlvri cfz6. mcx ) k speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock'sxr)flf*6 i vc-(.fxzrqk)m)c 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-+g :yqa)s c:qzzeii2uth gm-oz*:: o,kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which:i o+qz- us*qe ,2:)tyzgaczhomi::g 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 brakelqyp5 eq.2ne 83lrbdb, qyj ):3leb*ms of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twie8reqyq db pq3b5enm)l lly*.:jb2,3ce 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 mam50qek- r8,bze ab*gcss orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens*b5ce0,mqe8a zgkrb- 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 princixzi*tb z/gzg+(k bs )7ple.

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 a system to have negative potential ene:sl 2oh c/tbu2q0:nx bq;j5mjrgy?

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 q x7jf, ,uw7zka09futrest a height h above the ground. A second object with four times the mass of the first if released from thaf0,7qftukwj 9,u7 zxe same height. The potential energy of the second object 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 end of y cfgr tbl a/m2c5;0l:a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potentia5yt;g alcc: bl0fr2/ml energy 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 energ9k xq/14g8qce vtw q)iy of a system

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 p(n :nt5ost+ tenergy K, to its potential energntt snpo5( +:ty U.

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 driving up a hmc-+s +x,cz zmill.

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 andh v)1l(8 elngsp4l t8y a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same 1lv8s ptney 4g )(8hllfrictionless hill. Which rises 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 4iz jl :/x65o nm/2ez6 pbtmhf$m_{1}$ 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 of conservation of mechanical energy for conservatibqig mh;u3(2ugesb 2 xe51p 2fve forcesighe e2(qbs 1pg2;f32uubxm5 .

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 buildino;v t(7+.ete(8n z w yuv)ztedg, through the air (air friction is present), to theu(tw)zo +vyte7;ve 8z( d .tne ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of 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 kinetic energy. Do not ignore airnq k,i)(sjsp+zix ; 33iuzgv m0n0de 1 resistance. How much gravitational potential energy did thes03u(sv,mizin3pj) z gk+dix1enq; 0 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 distanco(: a jqnkh+r3e and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the 3rn o:( qjhak+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 conservation of enerh4p0yb-kmy+1 7alnfu gy.

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 is l6 /cmh dhz+b 3dphv78g+j2pw

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 expressel 8kgyn:ygf)db4*x cw q8- 0dod 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 a unit of 88gdw )ube rj(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, yoclr e+v/lj;q+vl1 d6au did 3 times the work in one-third the time. To do so, your power output musvc qldr/6 +;j +1aevllt have 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 car at a / rg rai-o p6)uz1dkz4constant 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 2.02zy ) y -2ny suftpb-0yz;oejzl8yk03 m and held there. If the object weighs 90 N, ho3z2o0eutzy2)p- 8 b ;yy lzysk0 f-njyw much work was done in lifting it?

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 t li(j ahypb374mg33pphe air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of the bo(y3hj4mp ap bilp73g3ok?

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 with a constant force of 55.qg sh66ojsk8 00 N for a distance of 50.0 m. Wq.ghos68k6s j hat is the work done by the 5500 N force?

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 pulled upward wmkmh3 58c3d8;q ptr zhith a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevator?thm3p;cm8q r 5khdz38

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 fpe,vrn a5 8s+porce of 5500 N for a distance of 50.0 m. What is the net work done on thrs ppe+, nv58ae 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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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 along a8q;hl*sf 3;io1p sl yv $37^{\circ}$ 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 fruit slides 8.0 m dowzdfhgf zm77;(7i/1,g v 2nortljs:csn 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 Sara(e:nf: o.fnieh in a sled on an icy surface (assume no friction), with a force of :oe.(nnff: ei 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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 (u/ u: p wprka9yywmx2z:b8noc+gu 2;direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 topc:n xw8 ak/rmp2;9(g +z:y2uyuuowb 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 object in n2d7aplvck c+e+d) gx+9 pcv:the direction of the force. The graph in Fig. 6-1 shows the force versus the object's pogcd+pdvlc va p9k+2) cxen+7:sition. Find the work done 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 object in the direction of thoa / w0w1 +euzhc,g,0 sz5;hbb bqq/uhe force. The graph in Fig. 6-1 shows the force versus the object's positioawb zwueq ,zb+hh,u0/1 /;05oqhcgb sn. 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 gracta *ql5myy1p cf+6m2vi0-x eph in Fig. 6-1 shows the force versus the object's position. Find the work done when the objectx1 pl250iemyfm+a 6cv yc*qt- 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 ag 8oi*djh*:d z 55-kg cart (initially at rest) across a 10 m level surface. What id h *:jiodz*g8s the final 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 (inik.c+q e b8mvz7cahjec w.k a5/*ml8q,tially at rest) across a 10 e,hm. /b q7c lkkqe5a88 c+mjcawv.z*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 moving with a speed of 5.0 m/s. How much wdcy)+f4 :-l/wut ei/zg/ab hpork is required to stop the maud-y pi//c/gt ) l beafz:h+4wss?

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 moving at 25 m/s, what distance is req34)e)dvcl quguired to stop a car moving at 50 m/s undegcq )uvl3 4)der 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 guf67ds+9otzur n propels 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, assumi udotz976s +rfng the spring has negligible 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 componj6a97ty nng/vsm5 *yuent of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts fromstyy5 n6vg*9ua m 7j/n rest, and moves 2.0 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 into8oicyk 34tdwq6c6 jo - a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm befo-t6kyq 4ido36 8w ccjore stopping. What is 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 tqv 8)r lnyy5:h)8w xn/qn9t flo a height of 13.0 m above the floor. What is the change in gravitational potel w) r8y h:9qny /nq)l8n5vxtfntial 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 k *,tt cmq:jln6v0 qm4up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionlest*jv nkmm,t4cl0 q6q: s, 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 stretch 2.0 cm. What i jt -:by3+psk,q sn3 zmms+zl*s tz mm+sn,:zkyp3qts l +b-* sj3he spring 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. Hou6exm5 hm3y vfc1e.r 1w much potential energy does it store, when stretcu5mr6. xfmhe3yv1 e1c hed by 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 compressw, fh0 wr3oh2nx r++mth 8mub6 an initially uncompressed spring with a spring co f82 +,ntw mrxh+hbow0 m6u3hrnstant 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 adgv pfr+7+ fu+1b3p z0jjgx4spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position ++v pf1jf0pg7a3 4z+xujdrgb is at x = 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 initiallk awa3xv 8s /yy1ek4 ney4:ba3 cf.hz8dt;mt ,y compressed by 3.0 cm. How much work is required to avd,na y1y8 3s38eamy: btkhfzct4w;kx e4/ .compress the spring an additional 4.0 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 8 b7yn/d;jhi3n e wv:othe top of a 50-m high slope. What is the spjy;wio3 v d:7ebn h8/need of the slier on reaching the bottom of the 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 ty ;s+2 joyzrjs)es(p,he top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m i2;( pjr)y+sej ,sszyo n 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 frictionless inclined plane. n4 vu3m6nm1 *tlprq :jAt the bottom, it has a speed of 9.80 m/s. What is the vertn 3p l1ntumj6 :*v4qrmical 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 flo.kej+w;uw8zroiu j ,(or. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy;w,jwu8+ ku.zjo(ir e. 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 10 N, blasts str)c9gqb7q-(k i /baozo y fr3,vaight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mecg )9 cooa b-/i7rkbfv(3 y,qqzhanical 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 ground with a kiv: x- yumfibzqfm d)8ho:2 1w(netic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it risei21hum (oxb ywd:q)f:zm-8f v ?

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 45 m above the bottom of a dip (Seeylg(pj 2:f4hm z e* +bj8ibm m;8o(xhw Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at :hoz xj;hw b*8ilfb+mp y4gmmje28(( 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. 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 starts with a speed of 5kic.1dw52g3i va rtd, .0 m/s 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 co3i v, 1rc5dktw.i2adgaster 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 a point 30 m above the bottom of a di)/4i uw *dvnndihk(o9p with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of tv un 9w)4ohdni*/ (idkhe 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 o kmbj nr:;7wg2so .zb(:,dukof 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 theml 3;2orj ltove2 o8-v vertical axis and released from rest. What will be its speed at thet2 o3-j o ;vvrm2el8ol 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/s hits an initi0-(lby .*lq )ptu 3tjm hinq+pally uncompressed horizontal spring with yp(n0blt.p3j)iqm ul+q -h *tspring 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 downad,r mv-sq*qta s741lfq 3 p/t her 2000 kg car to stop for a red light. Whavs7/qt 4*aqr fd 3qp,1lm-t ast work is done by the friction force against the wheels?

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 +: kh4)a2 r z o)v7cshmprpts/60.0-kg object and a horizontal surface is 50.0 N. If the initial speedr+a 4:hz rk7)vpc th)pssm/ 2o of the object is 25.0 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 mo x3kqts3)ov.x yvk7/mving on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. 3/vyvk.x 3km qs)ox t7How far will it 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 to a 2.0-kg mass on a level surfac2tpg)v0mzaj4c u0l(azzy/- k qhqf2 -e. The coefficient of kinetic frcq(0- qz va ym/alk02pt)fju gz4 h-z2iction 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?

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 top of / /fe al( aejq6y.f),yun8lsua 50-m high slope. If the work done by fri6)a e/(8sj .ylqu,nfuy /aelf ction 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 .8jmpzvm.s7p. 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 plan8. v.z7smp pjme. What was the magnitude of the average friction force 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 ,jh:6/(8tgycsa )f 0cwe dzctthe top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed ogt dc,t0 (s /jface:8hcyzw6)f the mass after sliding 4.0 m along the plane?

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 height of 10.0 m, and strikes w 3equhi,8d3/u ne2f jf8 :ruuthe ground with a vel,ujfqw3 r/:nehu i2838ued fuocity of 7.00 m/s. What average force of air friction acts on 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 60.0-kg boy using energy when he runs up a flight of snfyg0;1n.xb b-x od;utairs 10.0-m hionxb1bf.un -0d; ygx ;gh, 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 move an object wo)2j **1ftvycols 51*bo t3 gw hceg1xith a constant velocity of 5.0 m/s. What power mu1o yox wfh)*so3g5t*j1gl v12c etbc *st 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 energy are used by a 1.0 hp motor that runs for 1.0 hr? (0jebx 41mtl; u1 hp = bt4uex 0jml;1 746 W)

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 riding. How much forcu qb sdt0x)b wu4.0pzor07) aze does her foot push with when she is traxt0zrud 74qbsoz0)aw b0.) u pveling at 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 accelerates from 0 to 25 m/s in 7.0 s. What is the average p./.xduqtw+d deb() s,bt qfw ;ower delivered by th,(w;w sfteqb) duqt+ .xdd./be engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95