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

1#

What is the correct unit of work t y1u.tlbzr9+pr/ow5wul5 , wexpressed 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 systeet,ymsw wwrc.2 1bt1; m 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 statp.vxnb6o(w30mbvggp nkn /p;a*2/r mionary brick wall, the amount of work yop/;mkm 03ppg/xb6 rv*2 nngwano . (vbu do

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 vertic8pxwt w9g wg3ir2x/b 8ally and is being held there. How much work is being done in holding the box in this positit8 gwgi/wp8br2x 9xw3 on?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carg,-9y zolkyy3xfg5+7ff svj (rying a 10-N object, the amount of kvyfsf(y,l5g397 f-yj+xg zo 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.om; -q4h)u.+xfrrpzs 0 m then returned to its original position. If thm+)oqr shp zr4 .;x-fue 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 af;pr:nubaqm u +008ppn 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 straight up. noc96jvp t -6w2/tu u.lmtp 4s Compare the sign of the work done by gravity while the ball goes up with theuvt/26 6w-pjc9up.o4l tstn m sign of the work done by gravity while it goes down.

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

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

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

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus positj ye8 ta5js th3kv6(4by)gve(ion (F vs. x) graph, represents6((b)jkaste vt843 jyhvyg 5 e

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 tccif:i-le;jz idz6y o1c. ,8 fhe work done by the force F?6f1 zc.iyo 8,dl: e;cjifi-zc

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 the object's kinetic eq 3jjdb .1x wryqb(j:9nergy

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 9 bfjoye*n +4gnegative, 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 zelyt+ hvsk)b0)ro, 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 twicey(hxfhkj3 g m p m.luz74r il222x*7es as much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kishxu377y42 (klm.f2rh i*glz 2 jxepmnetic 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 a (:cg6.-dn bnhn sd/yis car K, and car J has half the mass of car K. The kinetic energy of car J, com/gdin nny6cb-(d: hs. pared 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 origiw b(j m.k3kxf0v8mup lo)gm* 1nal speed. What is the ratio of the obm 8(gw1*0pxm)kl.3u jfkm vfinal kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 m/)evkaf) v v/a-,8uu)ky* s2kcj ex1sqs. If both objects have the same kinetic energy, what is the e)*kkv8e1uc)y- ,2afs)ua jk svv xq/ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0)gw.xp3 x eu7jhm.k )z-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brhp j)u3x)kmgexwz. 7.ought 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 af x-hv q0gg z*y0tv/y8 panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car yggzhqf-*80ty0 vxv / 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 orbi3a yefe:pe7 ,w 0h:cjq*o ybk+t. Neglecting any friction effects, *7yepoh ek:30y: a+we,c qjfbwhat happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

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

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy ;2upn6r.e.gm glr .,hvts/qc 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 wutw1fn)89g s /yypy.to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the grob qyy2at7zaiv:;sj+4 i -opuk sy.7e 1und. A second object withsy-vqe;ko7 .u1+yi4b:asait z72jy p four times 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 a spri d03 zbuyyy1y2gjx c;gdp-3z-qw77 cgng causes it to stretch 5.0 cm. If anotd 7-7p 1b; g -0cwjyzcg2xgzydy3uy3q her 0.200-kg mass is added to the 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 energy ofovcivd8n (63a0:lmsx en x zzje+ozk0m(/y3 . a system

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compvn3rxd kzb m)6909 wg8wl9hvuare its kinetic energy K, to its potential energy l xwwu9 60kn99m8gbv3zrvd)hU.

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 driv kjj1opq5s* egjps) *0ing 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 e*b ( 6(b*mr/e oepjgwzb;/lnequal speeds along a level frictionless surface. They both slide up the same frictionles * ez/;no/ 6bm (g*eeblbwr(pjs 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 jm/hep3-5 gbe+* vqyu$m_{1}$ 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 mechanic wpgfdc*6w0p.z0y*f m7 ,anx tal energy for conservative forces.70pd 6fp, *ytfn*gaw w.zxm c0

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 al*3djxch z;es5fgi; wd) w,;d building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the buil;l;*dj z5d; f,cx deww3isg)hding?

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 o05 j,s thbfx+cf kinetic energy. Do not ignore air resistance. How much gravitationalfb+h05j, s cxt potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gruw k.kbd:w7toa:8n( it-5 l fuavitational potential energy. Do not ig::7a fdwiou .u ktbl8-wk(t5nnore air 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 conservl *t4;fj0w lpv 7pky3sation 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 ishh0:pcn ( od7q

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 expressuhtr b,+2dfto 4 hcd( 7;8mpnzed 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 /0 *ntoqgtfv+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 tias5(j af -is+:se+go2 bh,w rpmes the work in one-third the time. To do so, your power output m2 ,s+ spgehrb aj:if5(o-a ws+ust have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant a3q/24q b;s78qmhnq6aw hh m gicceleration, 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 anda6geh4i.7-:/m9 o dete4lk 6mpo ngno held there. If the object weighs 90 N, how much work w el. n:im9 o6h en/t4egma k7ood-g6p4as 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 constaqp n x3iyhalz q,7c4z) fu;a27nt velocity of 0.50 m/s. What is the work done by the weight of the z caqnx7 zl2 )yqh fu,4a3ip;7book?

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 )(kyo /goq6hvr7sn a9of 5500 N for a distance of 50.0 m. What is the work do7hak qo/ v)gn s6o(ry9ne by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 Nv)jz gq n9uohfk1;j ,+ for a distance of 50.0 m. What is the work done by the weight okj q ,+g)vzjnuf9 1;hof the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force ofafl7f6 p0v:5av n 8ol/cc0eeg 5500 N for a distance p n 05evvfaa/o:70e8gccl6 lf of 50.0 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 6.0 m up alk rgp( z*lql1nfbd)l a(5p,t (ong 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 slidevs*k iql.;o0ks 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister S.ijze52 b .lzearah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an z e l5j.ez.b2iangle 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 o7a:ik)yl ;n8dn8f w gbf the force. The graph in Fig. 6-1 shows the force versus the object's position. Find th) d78 l ;8kwbfynign:ae 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 the force. The r9nst-i2:t sobrtxt*ba0. + igraph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0n9b 0i2tx t+st*.trrib: o a-s 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. 6-1 ssawaap2k:5 3 ohows the force versus the object's position. Find the work done when the obje2osa3w :aa5p kct 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.d2otzm o )p9x7 The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 09 p2dooxm)z t7 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 is1gewxo *s z1-u applied to move a 55-kg cart (initially at rest) acros*wo1-zx1 ue gss a 10 m level surface. 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 zkgc7pc-,( cm cart (initially at rest) across a 10 m level surface. What is the finalm,c- (gk cpzc7 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 required t jv8lhl)diu b0p t*p)x8lwz3*o stop thhp)d0iwl tb *x l*u3p vz)8jl8e mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initil9s6d uvj h h7bd4xv0u+z8* zqally moving at 25 m/s, what distance is required to stop a car moving at 50 m/s unv huz bq*vsu +40dx9 l7hj68dzder 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 by exerting a for*k;*agu ld ,cuce of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, ass, ac*lu;gdu *kuming 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 ifd wqsscvy; t- ./1d, 3vd;chN and a vertical component of 60 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 final kinetic energc- f;;vsthq31s,wy/v .did cdy?

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 01g )frbnrs ,oof 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 a0) sr no1fgrb,rrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor to ahmim9h (s uezau/n;8: height of 13.0 m above the floor. What is the change in gravitational potential enu:z;h m hsinma(89/ue ergy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long logsao+ d(8(vcwl5mj/-2pd 0s b oqi /and rises 2.0 m. If the plane is frictionless, how much work was done by the push? sg2mb+i 58l dop0a-/ l/wocs odj(q(v

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. Wha3cv4 n qmhn1qd 6kvt57t is the spring conkt61d nc4vhn7v3q5m qstant?

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 .myc+cgk a:,wconstant of 60 N/m. How much potential energy does it store, when stretched by ,+wyc:camkg. 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 a:94 *spm d;)r+kqj9anjllue o+n2k pcompress an initially uncompressed spring with a spring constqa2:k pp j+n*4mrajo esl +l9;dnk)9uant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring cdh.wti-sv5s)xygfd 08 b4yp +zy9 m3s onstant 40 N/m from x = 0.20 m to 0.25 m? (Assu psgmsth.y)ds4 y-bzxi 30+w vd 589yfme the 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 1n zh**cw 4nbjconstant of 15 N/m is initially compressed by 3.0 cm. How much work is recn4** wj1zn hbquired 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 t*/1wq- b ir zbkg*a wb7cf0h9top of a 50-m high slope. What is the speed of thef*wtrb*c b/i0w7za -q1h gkb9 skier on reaching 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 spev3jx urz6rh+1 *un3h ped of 4.0 m/s. Neglecting friction, how fast will she be moving afuxn3z1rp+*6h 3 vr hujter 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 fthm5 ab :o9bw;rictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plan; bh9wot :mb5ae?

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 the floor, its pot ol0 ;sogs ,e;.m3y xvv/erm6lential energy exactly equals ;ee,xylvgo/v s63os;r. m0 ml 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 ground level wite fx:v6sfdrk0z9 8ip46q 10z idp qr(wv* :grfh a kinetic enegie 4fp f: fz6 qdx(r:dsi0z0rq 6v*pvr819 kwrgy 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 leavesf)u:y6qvt xb:k:uw 0 w the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertw60b:y ukf)u tx:qw:vical 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 zz3owwa c8 vwq4d,( /5wtg+ jt-rhtk0rest 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 tz (qwjckaww gz/34t,t +t08 5rw vho-dhe 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 witctsbf1c 6+1b oh 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 thebfct+1 so6b1c roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom 9itd870pv.d8dbxzcw 16i n w kof 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 oxd76 dk iwp cz8v09b.wdt 1i8nf 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 of its swing (poino. enx43 ;pylet

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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 0.11 m away from the vertical axis andfc-tut1 ez.)* g-ag 2u ofdoc1 released from rest. Wha-t)fe.2z* o- 1d1ao u ggtfcuct will be its speed at the bottom of its swing?

A. 0.147 m/s

B. 0.392 m/s

C. 0.588 m/s

D. 0.49 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 initiallytdiacov 8q696ed(h pa/(1tbl c f8+ eb uncompressed horizontal spring with sprinao1 e(9 q+l6t 88i chddv6e fba(p/tcbg constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red k:hhjp3 2m tb9 y:gn/xlight. What work is done by the fpj3g bhx9/: :ytm2nhkriction 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 horizontal surface dx(grz3h) frh sqteps /w) 7jb.,3rj9 is 50.0 N. If the ,e (r93)rrhztf3)wd pb g/hx.jq sjs 7initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 J of kinetic evs c v-*abo6k)nergy. The friction force on it is a constant 0.50 N. How far will it skb*c a-vv)os6lide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally t9pge)fi u1dp 7 hqw*n4o a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass 7e pfpn*wg4hd u19)iq 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 t,,olj:3rp 2ek.hm0a imw);rmjjb8 d e/xs7 qfhe top of a 50-m high slope. If the work done j bae 8s ,lmd mj 3e; 2fxkmrj:,h70rip)wq./oby friction 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 up an inclil1 d+7i. j-kk 7lnccaxned 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 the average. dckjnicl-l7x+a 71 k 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 toir8k6t v).mbmp 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 amm6 tv .8b)rkifter sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground9l zm6p f8-x 3kug/hjn with a velocity of 7.00 m/g-6j3f plu h8z/k9 mxns. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs u;v(kk (th /qnlvr76aop a flight of stairs 10.0-m h6 ktnh/ lk a7vr(o;vq(igh, 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 o /ot kpptq :,du*.dbz4iw 4sd gz;,k8of 5.0 m/s. What power must be delivered to th obds. d do;zup,z4/4 qg:pw8kitk* t,e 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 mot d2l37)f+ uq1iysd3jv 6tcicv or that runs for 1.0 hr? (1 hpv6d q3+)uyvcfi 7j1isdtc 23l = 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while ridxedd *y ,n8 ,uls:ggl4ing. How much force does her foot push with8u llnx:ye,,ds gg*4d 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.+v9tp.0gotq3p 2 f9brc2ltd sj4 in4i0 s. What is the average power delivered by the en3q 2fbit pcvpdo2 ijn lg9rt4.9st04+gine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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