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

1#

What is the correct uniu:s3z);j9b yj t mnz8mt of work 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 there isv*pm5jr *.inm ;0*b cprz; fct 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 againa e;b/ )55qncuhp xk/jst a stationary brick wall, the amount of work you doeu5q /xc pk)a /h5bn;j

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 y.-m,ea o9u4oc jaf*sm vertically and is being held there. How much work is befo.a9m-ou*sj4yea, cing 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 horizonta71g knb/k pz9f8j/i8mb-ml: ec dl ii4lly forward at a constant velocity carrying a 10-N objecl:l 487p 91 nfmiek8bjckg/zi i/db m-t, 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 smnfethyg2i )8z2f9 4 vertically 3.0 m then returned to its original position. Ii 4hzf2ftygm2 8n)se9f 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 z8k/yef6t/d3 w;)r oi twb8q yforce acting on an object do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball strr46vfj)e q ,nrsg13/ 5 ak55wae*rimhsr mg :maight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while i5wka 5v armrm3/r*qn ) r4 jmhsf,e:1 egi6gs5t 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 0/xwfvlui7-2+vf0 wn pprurdjc,/,u (F vs. x) graph, represents-drwpj lfvcinfu7w0u0xp,, u+//rv 2

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 posyggbdx 1b k.7hod(mq9+ /k*tfition (F vs. x), what represents the work done by theoxtm 1q7f bh(gddky*/k g.+9b 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 2 a +wljxi1lo.et(5 uathe 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 negati 9llgh, zmwb.c*,h z949rasyxve, 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 objectuaskcop :r2 m(- fwi -g;:-s zyet7(gy's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving a b 8sz4k:/qvov.a fesa -b*5oht twice the speed of the car. Which.a:bo54hb8fe sa-sk vvo *q/z statement is true about the 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 half the mass of car K. phym9e2cjk05 t8 okpdy 7 40odThe kinetic energy ofjoc9yh0ok 7pmd4 d y 2etp80k5 car J, 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 bounces back with half of its original speen:hr 8a80zp ehpa r;a,d. What is the ratio of the final kinetic energy p 0e8r8za; nhr,aph: ato the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed brmu06u5l8e5h yg rl ly92k5tof 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's mas50lly5 ru bug6hke l92mtr 5y8s?

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. A7.:oqv oxb yvyncq2rm:q l() 7 1.0-kg mass is moving with speed 4.0 m/s. Both objectv) :(mblyn v2qq7xr: o7co.yqs encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a cernebp-es7 ez c:r4e48 )bpn;trtain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under th bpec7:p n4re;)4 r8 bsnze-tee 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 ellipt6t9 j6ns +k+ 9cdnl,dptx/efbical orbit. Neglecting any friction effects, what9,pj txkb ftc9d6+enl6/sdn + happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

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

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energj0 glb ucdc0bq55 p m34)ufg3ay principle.

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 ha nja0lfvhe 72:ve negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest 5 gy*vhpd2u,x kafx(;a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy ovpa,f( 5xhy g*; kdxu2f 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 a spring causes it to stretch 5.0 cm. - iubd42+6ck1ox p4mcvr -8aqe)rxn p If another 0.200-kg mass is added to the spring, the potential energy of thebxia-2m-xv +ko61n4 cue)d 8rp pcq4r spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a e0t;o5sqth 7wsystem

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 ef/d /ul. jzxn+nergy d/nf.+xz uj l/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 drivi5u xn ecsxb54/,skcu89 8hesl e)s)e xng 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 spees5r0ex: j*x xb-cku2 eds along a level frictionles-x ckx 52*e0je rx:ubss 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 e.sj: rz2u(6 9-tot l(p:wlga dlxkq: $m_{1}$ 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 5s6kr8c1o ky d9 os;t jkz6,wou65kfefor conservative forces.kutco ;5,zoks6k 1fd 6 w9resj6ok8y5

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, throoee )d,3sru; dugh the air (air friction is present), to the ground below. How does the kinetic energy (K) just before strikus,do r e;de)3ing 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 enerzx978qv )vuql+ b)ttfgy. Do not ignore air resistance. How much gravitational potential energy did thl9+tu7))f bqx t8 qzvve 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 gravitational0guloj;k :lwg. :8rvo9uw, lx potential energy. Do not ignore airlu 98l;ulkg,ro goww:: .0jxv resistance. How much kinetic 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 conservation of energyo p*: adfle+s7 -dcu v,lrqrmlnfra u:h*;0 :;.

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 aft*q1al 9v6la)+hul

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 psbq x(psj5ge;pfz /s2t )ye-8ower expressed 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 unc /yt 6v k2i p+rd6ib-wbdji*1it 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,c b3+ kaew5;ig17 cwuo you did 3 times the work in one-third the time. To do so, your power output mubie a;o1 +5wcuwckg73st 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 iu2w-a oz.fu/ at a constant acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If thewtrh+q5a/1r(2k un4 bsb.kpt object weighs 90 N, how much work was done in lifat+k1. /2br ktnqhwpsb4(ru5ting 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 a7 gwqkt8x63uesm 0u/m3 )v9n0hxxrxq constant velocity of 0.50 m/s. What is the work done by the weight of the 86k rqn00xvt3x3q7/9hxgex )su um mwbook?

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 consta h0f(o+ar gej: jbv6n2nt force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N noeav0jh +b (g:2f jr6force?

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 nds 1+vksj +w g8+mmw,a distance of 50.0 m. What is the woj +k+ sm d+vnww81m,sgrk done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward wi 5sdnz:yald :k52qakwo:e2 f9th a constant force of 5500 N for a distance of 50.d:d2o a9 :kfk:ealz2 w55qyns0 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 6.0 mbid5d 3b,q;8 ow+tous 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 8.0 m down a rampex)/+o6; zgi tncb7kr ,hc b6a, 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 litt eel 6w9g4g3e86g bqhyx/z0qt:rgu y1le sister Sarah in a sled on an icy surface (assume no friction), with a force6g1egru g0:qze/8qbxhyy 6 9g3 wt4le 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 object9r 0p)h 0zbglh 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 ml p0bh 9r)h0zgoves 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 theq tq m,yvb/(r) force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when th q(v/,qbt)mr ye 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. The graph in Fig. 6*e1*b o)vl fts-1 shows the force versus the object's position. Find the worv1b e)tfos* l*k 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. Theiqg o0d8 aa(.hvx 32qapl79ab graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from ib0xaq7aadopg.h 8v la(93q 20 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially at rest) p-b67f+htu yxg xp ,p(across a 10 m level surface. What is-gp, +px6p yuh7 bxt(f 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 app:4,8x i3vlkthst rw7y6vgq 1 zlied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the ,htvl rq:yzwx i6s8k7tv4g13final 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 is require kpst3apr7dku7r/ 4u va9x n/)d to stop the massa) /kvtp7k9u3r rd sn4au7xp /?

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 adm2 a83tv f7xs car initially moving at 25 m/s, what distance is required to stop av8 72xtmfd3as 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. Itsb+edmdue)e33 u1v u ru0d1c/ is cocked by exerting a force of 20 Nr v +bu113e d/mu es3ue0dd)uc over a distance of 5.0 cm. With what 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 componf,/ qb7 4fvaweent of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts qwfe 4bvaf/ 7,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 bale5c 6rduh.ijy iek45t + of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arro ecyr6 ui 5htki.4jd+5w?

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 abov0ibj3p 9fwa/z:se u: de a floor to a height of 13.0 m above the floor. Wha :9 :d3eb apzu0wsfji/t is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclinsxy f+(quaz1+::v9q cu6sb pqed plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionlesvufs z9++x q: 6qqc(syp1bua: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, causes3+ *fdmh act1r the spring to stretch 2.0 cm. What is the springdh t+acmr 3*f1 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 constan-h+lx -mamh0isa5qs)g p (5 nqt of 60 N/m. How much potential energy does it store, wi a5 mgs-p5(lqam)q+0 hhs x-nhen 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 uncompresse7 f1, *cemz n,9omsvwmd spring with a sprin,zcmm o1n7wf s mev,*9g constant 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 springtpe3p v pxh+osx7js.5;z;ye, constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched p +ezxp ovjs; hxs,ey.t35p7;p osition 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 sprit68qj8txrw4mt:q b;ybjw 80 r ng constant of 15 N/m is initially compressed by 3.0 cm. How much work is required48 6t8mqj rt y wbqjt8:;xr0wb to 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 the top of a 50mwus m*+9 3ivy-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglyv+*3m iws9um ect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an innoeaz7: pmd24z/z, 2tf+ jka q irew-7itial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 me /-t2zonj rzq a7dp2ki+mfze :a,4w7 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 inclinesa b; 823:j/0rg .vfn/k.wd tlmorjowd plane. At the bottom, it has a speed of 9.80 m/s. What is the vertof; njm:8glrt/0wr2.bd.ojkw 3 vs/ aical 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 flooz*r,ip0q pi)qqq j; w(r. When it is 0.70 m above the floor, its potential energy exactly equals iqq(0 )zrq, iqi ;jppw*ts 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 fr*, qb4lnyzna 2)sbv0 4g(vbh qom ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J*b qnvnq0gb ,z4sy)vhl2a4 b(. 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 energ u6( rc v)hry9pxb6go+y of 220 J. At the highest poin rgb ruy+vxh )6c6op9(t in its trajectory, its kinetic energy is 120 J. To 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 45 m above th: cu;qev a*x;am+ 8+vyjy-ithe bottom of a dip (See Fig. 6-yvqi8*a ;:;ae m+ujtcyvh-+ x2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 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.dvn-l3 ,mw pn*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 rolln mn3pld-v w,*er coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip wf95 k6 hdqnj1h e e8z0jmn-s8aith a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the tjskj 8hhd5q m6f0ne 9n 8e-a1zop 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 ball at the bottom yj3 asnm:o i8h02frm(of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the vertical axis and relq(( e9yc)s vjf2qgep 8eased from res(svy8ceep(gqj)f 92q t. 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 xr3(poeg1x3 itn8fj d e+/cr 2horizontal spring with (gn32+rd8x i 3epcrtjfx 1e/ospring 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, shic,x//; ajwq lows down her 2000 kg car to stop for a red light. Whatwa; /x ic,/qjh 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:dfyv(e7w 0o +c)ir14s lc etp force between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?+t4e 0edyc1rs(o:pv ic 7l )fw

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 roughr )1zn02p 8wzvl0vk5dlnae (k, level surface. It has 24 J of kinetic energy. The friclwe zp85vdvn2k n10 rka)l0z(tion 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 horizonta0otet8u r i/:klly 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 okr/uo8 t :ti0ef 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 from9 xlpa+y a ufc*pl1kuo +,p2b8w8 x*fx rest from the top of a 50-m high slope. If the work done bxp ,82xuucpoky8wf*lap1lax* f + + 9by friction 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 inclf30 jvcc.tmqtbi+tr iq5p402ined 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 wa+jb tt0r cvi20pcq3 .f4m t5qis 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 r6mitr37t s5k kh*mphn*3by- yest at the 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 of the mass ht3-s7itybrh5* mmpk ky6 3n*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 z7a unuxqsi9w3t4 4+6x ni f7p10.0 m, and strikes the ground with a velocity of 7.00wp4xi7s3nq uu9+ ai6 fx4 z7nt 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-kgxcvcgq79 jtjb, 2a:b7 boy using energy when he runs up a flight of stairs 10.0-m high,cqx7 c7 9:jbgv2,jbta 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 with a constant velocity of 5.xp*97 p9xqv6q w-uchm0 m/s. What power must be delivere9c -q h79xppvm 6qx*uwd 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 t* sj ouaif9-1a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 t9fuoa1 j-*isW)

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(l0m o o8nqcjgz 3 )8rbp+wa7v rate of 500 W while riding. How much force does her foot push with when she is traveling at 8.0( + 738m orqvlg)wa8cjp0obn z 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 t1sf 5cld nvl-o/1kv+qo 25 m/s in 7.0 s. What is the average power delivered by /-o15v d clvnkls+ fq1the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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61	62	63	64	65	66	67	68	69	70
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

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
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