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

1#

What is the correct unit of work expresseq ot+y3deofzo ,eg*-e6)iy )j d 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 systec9gt/bwwq7,7jnbe1.uk)ce gm if there 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 of work yoo3(mr a79jx2azn 6vir u d r(a 32 7vmrz6inaoxj9o

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 vexc-gma zw1 o2 lq*o84brtically and is being held there. How much work zmo wa*obl4 c g28-xq1is being 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 horizonb.9g obgk4znx**ekn)zaeg .5 tally forward at a constant velocity carrying a 10-N object, the amount of work you dabb .5*n9 x.oegn*kzeg)zgk 4o 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 thm dn 5p*w7)ejqen returned to its original position. If 7npm5 e*djqw)the total weight is 30 N, how 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 work on tkpd(6n p ;v b -h;o*fdk+a4dcah;g+vu he 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. Compare the sign of the 8z z,ayu86cwxwork done by gravity while the ball goes up with the sign of the work done by gravity while it goes do6zx 88y wa,zucwn.

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 a Force g3 )hqoly+dlf:q0( 7lx*d0w8o l xd jdversus position (F vs. x) graph, represents)lo:hg l8ylx+xf37wj0q0 *lddd(oqd

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 blz )yc(, ad:wthe work done by the force F? y) al,c:wbz(d

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 positiv4pr;c/fj * z 6gx-iaojm(ccwh). g/ 4mzwqx;je, 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 on an object is 5re k-xko2.xtq4r5ibb o,w o(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 oiwnk-zjwzvu55 9c +y4n an object is zero, then the 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 at twice the speed of t9 4+4hso4p (f8: jmn jxgtzeckhe car. Which statement is true about thehtc 4z+jkpoxe8nm49:j( sg4f truck's kinetic 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 car K, and car J has 9 qd4-lp,gth5cicniv;d x6 u-ld4c:bhalf the mass of car K. The kinetic energy of car J, compared to car K ictd6 -h i9;id4-lx54dqbc cgv,lnup:s

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 bounces back with half of its original speed. Whr.44hibrf qhkch, pt/-i( mm. at is the ratio of the final kinetic energy to tb /tp ih-hfm(k4qc ,.r rih.4mhe 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 of 3 m/s and aja1o ,hox* zn7 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 masso 7ax 1hj*oz,n 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 moving withte/d4h5rxh 7 de2nx8n speed 4.0 m/s. Both objects encounter the d45e t/erh2nxd78 hxnsame 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 p.wuwxy6 mp4bo;(; 0edjs 1cy5qcgrj.anic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the cap rw5(syeg c.jcj m;;0qb yo4d. 1xw6ur 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 an elliptical orbit. Negle7p/nh4.w y7q)c3jia9rath z jcting any friction effects, what happens to the planet'.4 9c/a p j)yqnj3h rt7hi7wzas 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 principlel xpdtjgi )24*vr+hy; .

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 potentiyd0/0 098 hsne,h :llmhd6dfjebaf /pal 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 2;x0dxcc ycmcm5)yo 4 height h above the ground. A second object with four times the mass of the first if rel;m5cy0xy)c4x2mo cc deased from the 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 t z7yds/ruj21nwjpmm 8;j 9xw 3o the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spu 9m/zdn7j3s jxm1j8w2ywr;pring 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 )t54 :wkp6yb aw ygh,q:4lom gsystem

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, to its potential e8n9/sintm0id: zg b/ energy U/ n/8i i:egmtzbs09nd .

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 drc g7p;))-yidbv;snuj 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 heavy object are sliding with equal speedsc5ll77 r upryw(2dg1v1 7yrrb along a level frld1rrc7 ywr17vyp 75 lru(2bg ictionless surface. They both slide up the same frictionless 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 9ayio0uuk--vpq+ arv.+h*r f$m_{1}$ 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 fofn9u5z - ;(c8jzk tvznr conservative forces zztfuk9(v-j;czn 58n .

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, through the air (air friction is presen5npi;q*r5 o89lcr ekpga lw/3 t), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at pi3r ok*l5 /cn5wgrp8ael9q; 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 o/9mziazso-ls - r ..b0 tzg1owf kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ballw al1si9z-/oztb z0mso r.g .- 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 distanc)o 6/l 1jz5u qunqd.bge and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did lu5od j1 qg)bz/6 .uqnthe 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 ozxqksvz m,g+pma y/24/f0vf4f 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 is7dyn-:*y:cgsn evm p(

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 expressed in5fut vzd.h*08m6q + 6:r;cfzxo2kvt kre jt f* 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,/3x (+ew lz90 :p0m pzcodst cr1apmb not a 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 bxasncj(s5: y hauf+/ dz 96w-one-third the time. To do so, your power output must havej 5fb zxy6s-9/uws :nhadc( +a 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 constant accy+x7ms5z. dgtm,cv e 0eleration, 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 the object wessf1oof-.ff8;; uk u si-) rxcighs 90 N, hoxou;s;f rkof -u-s ff.c81 )siw 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 the air a distance of 1.0 m, at a co,50zg. i3,wwwe gau qlnstant velocity of 0.50 m/s. What is thea3ez,g.qu wl5w0w,g i work done by 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 with a constant force of 5500 N for a distano*n5go w)9 wj, ga8nlice o8wig jonwn, )a *9l5ogf 50.0 m. What 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 uv *(l,ad st jpiyn /:9cw7lju)pward with a constant force of 5500 N for a distance of 50.0 m. What is the work donp(n*j t/,i:)la 9 ycljsv 7wdue 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 :qfo.iac7.k aa:*ap o mz- b (y*tp)vx1w-bjxpulled upward with a constant force of 5500 N for a distance of 50.0 m. What ib. bx *ti- ay(j*k:mcp qpo-xwaa.z7avf1o:) s the net work done on 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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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 whn j:v5o5 ep0a $37^{\circ}$ 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 down a ram)p7l i4 x dc+:k-npxvup, 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 onuyh2/yaqc cu n *x(2.j an icy surface (assume no frict/qhucy ac2u(*nj 2.yxion), with a force of 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 bsyb5 rnpvjb*+ 3:bi(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 mo5bsbbb: *nrypj i3+ (vves 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 object in the direction of the force. The graph in 3xut58py3 mgh38 omn7of+tpo Fig. 6-1 shows the force versus the object's position. Findho5x8uy8tmn3gf7 +p omto33 p 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 the forcel +tjz b2n un(*s+k8if. The graph in Fig. 6-1 shows the force versus the object's position. Find the work donesi ujknblf2+zn*(+t8 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 dii3ag k67(h rfdrection of the force. The graph in Fig. 6-1 shows (hk6g7f rid a3the force versus the object'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-ycw(y uc)38 iikg cart (initially at rest) across a 10 m level sucy(3ii 8cyw u)rface. What is 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 (initially at rest) yui1 iwhol,p,i: 7s,vacross a 10 m level surface. What is the finali7lvp,1i:y,sw o,uhi 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 work ism 1eg9d/,sl p1g: y,fe b1auod,p m;zp required to stop the mpadzdegg/ l1p,ofs; ,:emu 1y mpb,19ass?

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 initiatux1s-2p5j *a p1glbxlly moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same x1p-12plgub*ja5txs 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 propels a 10-g dart. It is cocked by exerting a as;dk*im63 mw. bo sw5force of 20 N over a distance of 5.0 cm. With w5ams.6 3 o*bd mkw;swihat speed will the dart leave the gun, assuming 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 component of 60n 8m bdosv3 k( lti.7p5hj+,ry N. The force is applied to a box which rests on a level frictionless floor. The cnp5 t+rsyj(3,k8.o m vh7 bldiart starts from 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 into a bale of hay, striking 3o4(k xmy9 vn)d-,u 1cldj1ei.o co.7ibjnmqthe hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Wbv.y1 1l4jmm cd()iicenujq3d9 oox.o ,nk -7hat 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 fromu lu2 .ry5h(he a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitatiue2. hyrh5(u lonal 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 plrq igst6 v03.nq yd* /kaey;a((yo0yoane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was g0akr(y6 y; *qyitadsv e(/q 3oyo0.ndone 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. Wh7o1na4ru -ocnm -q..nikx7t)ov 0to wat is the spri. v.ao0 t7uoo1-n nq)xro-7nc4 wmitkng 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 much p h1(lyy:)f3cf ya o brvm8 rwg;9x5ad;otential energy does it store,afa ;cg ;) orm y h:b53yd(8l19wxfryv when stretched 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 compress an initially uncompressed )g+gk-x;ufn)ozv. wr fanu0 -spring with a spring constant of 25 N/m)-unfvgk+ .awg0o urf;-nzx) 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 ;nr)tavk5- -pfj t)rmgjb4u 3 x = 0.20 m to 0.25 m? (Assume the unr 5jk utfrn3)4 pgamtj v--b);stretched position 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 const)g; b4 de egx7p mh.qpcrw-)he(ao4y1ant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an ; b)o p g.g14(wrp7mdqacexh -4ee)hy 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 the top of a 516h4xfug; vox/1 xnq k0-m high slope. What is the speed of the slier on reaching the bottom of ux6;vhfgn1x1/x kq 4 othe 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 f,foox5n*5w fn,),rljoj x r7hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving aj,o)n fn75,r 5*,oj offxrxwlfter 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 frictionless inclined plane. At the bott.n3b ovc qsej *x/):rwom, it has a speed of 9.80 m/s. What is the vertical height of the pl: )xveqojrs/c w*3 .bnane?

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 0.7lr ;dye,/h )ld0 m above the floor, its potential energy )/,ld;r ehdly exactly equals its kinetic energy. 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 straight up from g47 mgpax (fv; ub-yf3yround level with a kinetic energy of 40 J. At the exact top of its trg yp73 ;f4m-vu fbya(xajectory, its total 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 ground with a kinetic energy of yw)b zc cr36n5220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relativen)z6yb c 5wcr3 to its 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 ab+wm*gh u65 .hdtp nc/t a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of thedw c5g* 6pnhmth+./u b 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 wikp ll2i7 gw 0+eja1ys(th a speed of 5.0 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 coaster at the top of the next slope, which is 30 m above the b ipk2ag0w+s71lylej ( ottom 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 30x.fc-isy:. - nv3zzuf m above the bottom of a dip with a speed of 253uzs c.-x.nyz :ifvf - m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the 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 of the bal/gfz y8hn/ *jll 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 cmm, v24roumd9:ly z49suq 9r fs away from the vertical axis and released from restqrfo :mru9 ,9mv d4yzuss9l24. 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/s hits an initially uncompressed horizontal spri1 xnay- w(-fvfw1lv4:6glh mkng with spring constant ofyvm xv16: lnal1f(-4gf k-w wh $2.0 \times 10^6 \; N/m$. 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 s1h (:d;rx ftgj*1)trld vok4 jtop for a red light. What work is done by the f1jk:1jrg )fhvd4d;lrtx t o( *riction 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 60.0-kg object and a horizofeamap38jhmka22w 3; x0 jd 7.18yay6cqkjacntal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distamj7a fj .1epcy08a 38axwa6k3jc2m;dhqayk 2 nce 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 ofx)1m+5e yi, lck(ajoc kinetic energy. The fce(jm+aix5 1ko), ylcriction force on it is a constant 0.50 N. How 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 hoc6w* ave hz4j4arlk fz43d+2frizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, whatalcr46+*zd az 3ehk4 v fw4f2j 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 rehgsgs1 yu+u a0d;+ ,qtu6qp5hroi5l*st from the top of a 50-m high slope. If the work done by friu0go l*tugh6r5 pd h uyiq+5 ss;1+qa,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. The planexpv-+ pale, 2y is 4.0 m long and rises 2.0 m. It requir+ alp-,xp ey2ves 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

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 p lmgh,/td(a *alane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane a a(,*dm/hl gtis 0.20. What will be the speed of 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: .ov y(s eo54fwnra, fica:/ri y/es7 height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. Wh view:oayyf r nsa i4,:/s(5f /o.r7ecat 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 using62esa, ui 62 *z8zlsjeznqm0pek q/l. energy when he runs up a flight of stairs 10.0-m high, inz/ zn spekz6qj6a es8m02uq*i2le l.,
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 objeqt.gpvng-,x5 ct with a constant velocity of 5.0 m/s. What power must be delivered to the object by the force?g vgx.-pnt q5,

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 energyye .z..zl vbg;74z koc are used by a 1.0 hp motor that runs for 1.0 hr? (1 hpovbcz..e;z 4z gl.7ky = 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 hiq i 47 bfgqqr c,*y28yyrz88W while riding. How much force does her footr yr zg8i4y*qhyb8 i28qc f,q7 push with when she is traveling 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 power be.vp4euvj44jwym 97 deliubmee9w44v. j p4y7v jvered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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