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

1#

What is the correct unit of work expresse +p95qxnqa.jqb,8 ycna jae6* 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 system if there is no motion?i6mv5 g7 nysa 7* wy, loro,roi5aur;;

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 stawwe35m ( dugfb72w a;htionary brick wall, the amount of work you d ewufm57(ga; h db32wwo

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 bea);9rp xfnio+fev 6 f7ing held there. How much work is being done in holding the box in thif7oaxv ir; )efnpf96+s 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 ,-,:4i0tx ky yamf; jhqvghm, velocity carrying a 10-N objec ,h:0tkx,,4q m jmig;yyvaf-ht, the 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 itk/k h5lnumi7t:(f sq, ft7 9tys original position. If the total weight is 30 N, how mn 97ty:skk,qim5(f ltuf/7 thuch 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 the objec6sx,i8oi (02 nmmpghl9ik: 3pc z3ejet?

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 work done b1+7y vgj wkpf3 +s+d csnh5h,n zv2a8dy gravity while the ball goes up with the sign of the work don1j5+ 8p3hdgdf, 27wyvnk+ +sc ha nszve 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 a Force versus position.fv9 tchba x*f,5aj,b (F vs. x) graph, represents b,.* 9bc f5,fhatjvxa

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 v+c9 77hwhtrbe;o-qfqbgi +,1 vwju 7wersus position (F vs. x), what represents the work done by thert ww ib+7huof77jqq v+cw;,e b hg9-1 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 .rzaxt bz)m) 4xe cdiz,)w:h4the 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 p-l,6wn)hvbw4 boku .rl y+q.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 rr8 5q ://gygougxl )lis 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 sdy0am3mg:0cv z7u dp 0peed of the car. Which statement is true about the truck's ku 0cymg:adm0d03v7 zpinetic 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 half the mak ++ouys+b ixprjg4tyq12g;v ,m pi8:ss of car K. The kinetic energy of car J, comvigis;++pymkou:jp,+y 4t g 2r 8xb1qpared 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 bounces back withkay;,ul cm mq vt7a;1.7e.4klgrc)a n half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic vc;.gal,)7tk r y;n 4au1 e7mm.cqklaenergy?

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 a pebble is moving at a spj p89a1sqf4r8g)mrr 5ac 4xu ueed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rocxas9rmr aguuj 158)frcq p448k'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 withef/v5f , i7e8*fphkpf,l +fzl speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopel+fvpfpz*e 78 , l,h/5ifkffping?

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 5n pn;m 0krv) bpax+l+panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skiddx+0;bp5k)m nvp +nlraed, 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 o-.b mr. vjtzs.rbit. Neglecting any friction effects, what happens to the pl..t.bs mvzjr- anet'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 principlaaa 74 bayw sq)2mnx)cf3;k,fe.

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*sbsoop0c 6d.76 mbps 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 released0bu hs6jw) lt0 from rest a height h above the ground. A second object with four timeuj)0 tb0w6hsl s the mass of the first if released 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 to the end of an hc +v.sw3z:b spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to + zbvw.3c: shnthe spring, the potential 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 enerv7zf* j; guv6ggy 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 tesnmv28y ii yk:9z0a*ree. Compare its kinetic energy K, to its potential enerzinm* 29ykyveai0: s 8gy 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 hi:2 zj3bz zw-trll.

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 speeds alo3 t rmc1c2b5kmng a level frictionless surface. They both slrc5t3k1c2mmb ide 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 -patyf 3ig1/ ,spnjd5$m_{1}$ 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 conservaeh63f2v) 3pv lxu8cdu tion of mechanical energy for conservative forces 6 x3lh23v)upc uvd8ef.

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 dp gco6x1+i,rb8k5l dk rj7* ntop of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking t1cl*+inr o7bkrdg56 jxdk,p8 he 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 ig04y7l ujq -x np 56y n9kt*+kquk(rbwpnore air resistance. How much gravitational potential energy did the 4q* 7uxl wtk5j k-nqp0n(bu+yk6 ry9p 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 and loses 30 J of gravitational potentiamvc3 ;uq8m:d f(dht6bl energy. Do not ignore air resistance. How much kineticcfd mdbq83t(v: m 6u;h energy did 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 conserva 8rk;fz +wtf)5sg uw/stion 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 istl 3zxd1d * (-wgi m)gh4ztam)

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 in SI uq,;* uc+tx z7w;uj5pomx 5gbznits?

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 1qpy y/)whyfr8i l:e4 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 thmlp ui. ;txml5djp+i8 ,:o0x7v. h ovve time. To do so, your power output must have b.:t7, 0h+ uj8vp p o idv.5o;ixmmlxlveen

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 acckr0u )z*7+q/1 u( uxmgp unoceeleration, 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 objectf l1dby wt)ka,quq vxq6;n 4 l*d*;m4n weighs 90 N, how much wobl;ml,4** xtq)nddw ;k1 6q4 vuy fqnark 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 bo4*v ,3kvblsiz:s so0z5 /myhzok up in the 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 thz:*z i vslsys zv km/obh,4530e 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 pull /,rx.uw)byq5fglbx qt;2psae6t (7z ed upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 xxq/g bs,uf7et2 lw)(z5yaqtb. ;p6rN 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 with a constant force of 5500 N for a 3vrvb)t8 w *gcb* 3g-*fkci yvdistance of 50.0 m. What is the work done by the w*cbrcv-w8*v3* g i ykbtgv3f )eight 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 zbkn asph- v9 n+8(o0)/h nxvvwith a constant force of 5500 N for a distance of v9(ob+anxv-8h shn) vn0k p /z50.0 m. What is 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 6.0hvz(((4u5zhrq . vwzes2bxr:8bq j8y 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 fruit slides 8vke0pot; s1y+u z u ,smfa)/2b.x x/v i9he1iv.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 icy surface (assumx8 jy fg(htibx9t(ht82 mzv/0e no friction), with a force of 60.0 N at x mtf8gth/(i hv80j(xtzyb 29an 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 direction of the force. The graph in Fig. 6-1;a9oq::n4djltd8r 1fp m gg/os6l p2j sh2:dfpsldg 814qm/ jnot9rp ;6a j :gloows the force versus 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 object in the direction of thlt x7)ci jq+no(8xhj8+,-ts lqmp4dx e force. The graph in Fig. 6-1 shows the force versus the object's position. Find the )qlx 4 sj(++x-c 7iopd8 txn,jtqhm8lwork 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 force:e*er fe-g7eq . The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object:f 7eeeqer* -g 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 foyq4hk pr-),yr vwb6e+rce. The graph in Fig. 6-1 shows the force versus the object's positioqy-pvw+kr4eyr, h )b6n. 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 Njd4h*+sxyp v*0a:dpnv r ba .: is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the finy:4n*.0v*hs a xd dp vpa+:jrbal 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 (initial00rkb ) g2z0zvd ycr(cly at rest) across a 10 m level surface. What is the final gd vyzc)ck2 r(r0z00bspeed 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 g -ejm 3a/g/)skoyzh+is required to stop the masss) o3+ -e khgzjmayg//?

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 movin zfn1nktl1l ,5g at 25 m/s, what distance is required to stonl, lt fk511nzp 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 propels a 10-g dart. It is cocked b)e8vnrc dg 8sv7-fr1 qvbx ,z)y exerting a force of 20 N over a distance of 5.0 cm. With what spe,zngqc88xse rv1 ) d)b-fv7rved 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 67 0gjze 6kre7)ra9knv0 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's )r6zje k egv97r7kan 0final 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 ol(ecjg s/y 3:vm 16jldf hay, striking the hay with a velocity of 60 m/s. Itl/jgjcmvs ( eyd16l3: penetrates a depth of 20 cm before 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 floorw3qb *b-pw7sg to a height of 13.0qs7-wpb3 b*w g m above the floor. What 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 upixloi,y( qx) qc ;vi90 an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plioqc;q)i09 y,xvix( l ane is 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 sprinksgxl l w-tv klfz01kmlb:w,3+ .3nw :g to stretch 2.0 cm. What is the sprinlv b nk1::tlxwgl,s w3.kkz+ wmlf 03-g 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 sprin eop,tgivd 4/0g constant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm?e0 4 /,vtogidp

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 uncrau /)cwsy 59eompressed spring with a spring constant of 25 N/m by/9r)s c uaw5ye 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 fro8aajc pe )-3dhm x = 0.20 m to 0.25 m? (Assume tp-)8hc3 aadej he unstretched 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 constant of 1m aef(paqd.9z2a io0)5 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring aaaefdqa( o2i.)m 09 zpn 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 bjh d cl8w1t 5im)/gbyt ma*0;n/ad3 ia 50-m high slope. What is the speed of the skier on reachin )nhd dw//cyg;m tla0j*a 1b8bt5im i3g the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 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 speed vhb qi.24kr+3t s+bnrof 4.0 m/s. Neglecting+b+iqnkt2r bh rs4v. 3 friction, 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 frictionless inclined plq hpict+tt96jn2 , 5okane. At the bottom, it has a speed of 9.80 m/s. What is the vertical hek9jitq+,o2n cth5 6ptight 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 above thevn-x-. ,mbjcax0s/ 1s dwqhu: tkq0s;:en+ny floor, its potential energy exactly equals its kinetic energy. How fast is it mow1me. b 0-dxy/q:+0 -qxtsjs :u k;vn, cnanhsving?

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 ground level with a kinet ho0ge p 5i*ii+s:oj/wic enjoi+ pgiw5/ :0ies ho*ergy of 40 J. At the exact top of its trajectory, 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 leaves8q.*lm b x9fkr the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To fl.rkb89xm *q what vertical height, relative 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 at a point 45pp2hw35e+a7a9v( )i;- udxuo spsat-gb. j in m above the bottom of a dip (See Fig. 6-2). Neglect fricton.2sw sd795 ( )--p xip+ae3agvuhb t;uipa jion, 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. 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 5.0 m/s at a+6u up 2ci0r kf(r+.yiq5yacq point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the royrq0 yc(qfu+ck2aip6.ur+ i 5 ller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

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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 3ghg1bivs+ x/3 0 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of t +xi1s3 hvg/gbhe 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 ball at the bottom avr5 dv/c5.jd1p,3l ms; cnibof 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 2-kg pendulum of length 50 cm is pulled 0.23 m away l1,zorgr3 3zz from the vertical axis and released from rest. What will bz 3,ozr13grzle its speed at the bottom of its swing?

A. 0.3144 m/s

B. 0.838 m/s

C. 1.258 m/s

D. 1.048 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 fdcg *a7rxjra hi5 h1.31 kp1nxd,i6ohits an initially uncompressed horizontal spring with spring constaxi jgn.,rfh5p161 dha*kx3 1oi7 d rcant 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 0nwkei6 nsz28 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction foe8 02kz6wnns irce 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 ho;w 4grk7u ,xg 8alth+,uwtp a+rizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it 7+wut+lg; ar,4hk a xg wu8,ptslide 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 kinfi cf:7rdr f6e8)o -0s, sli,/o3df;yy rfdgcetic energy. The friction force on it is a constant 0.50 N.c3 8 lf,d6 r g/7oi:ef0cydrssr-f )y;dfo ,fi 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 1fj8xev 7n *9lo 0nryhhorizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the 0jhl9n7or*x8 1 nvfye 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 a 50-m high slope. If the wor 09qmku :txi-fk oj(wzku1. k1k done by f1 w . (uxi1mkkjo-tf9k0uzq:kriction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed m-3+t h sbm61qptzv w,up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of ,t-s h v+3zpb6mmwq 1tthe 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 plane i,v *nd lofiy15nclined at 20e 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 alonni 1ldov*5 yf,g 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 h; f32ljpt0tkry/ ax d)f8 rc2seight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of 0pls8 txj k2)a;frrdyc/3t2 fair 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 1e/5p n bwhxo3( vh9lousing energy when he runs up a flight of stairs 10.0-m high, in e5/wp1no xo(hbv3lh9
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 )+bvajczfmqx,8 , 8gp object with a constant velocity of 5.0 m/s. What power must be delba,g8, mcqxz+8f) jvp ivered 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 r.ugaizr 21 l kjxya,.4uns for 1.0 hr? (1 hp = rzy1.a xl 4k, jig.au2746 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 Wmyjf0m6ae 5o5 while riding. How much force does her foot push with when she isme5j0f6a 5ym o 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 w2qb cvbu v b7omq89gd 5g9d-.is the average power delivered by the engine? (1 hp = 746quwv9b b8d. gg9bc75dovmq2 - W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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