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

1#

What is the correct unit of work expressed in SI unitsx,/hhx +py uu6?

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 motdyh42v2naje wl l m+9d;c hr:;ion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, thesin(vxmk-1 )5 9.x 8qirat*i:oc byls amount of work you q kx(:ybor8 ia i 5nvix -l)*s.tm91csdo

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 beiq); aq1sg7uref/zm d2ng held there. How much wor/)squmr g;faz27d 1e qk is being done in holding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m hop q0ec( qz,sfph10lx2 f9s k)prizontally forward at a constant velocity carrying a 10-N object, the amouns 01p 0s, ppql(kxfq)fz29hc et 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 vertcq3j/dyxm 3 34h/um zeically 3.0 m then returned to its original position. If the total wez yqjc 43xh3/m3/uedmight 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 fo6xd; 1z,k+ k1kgwmrj 3bir4zorce 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 straight up. Cg2a ngfbmp3o2g+n.2 hompare the sign of the work done by gravity while the ball goes up with the sign of the work done b2g2gbmpfo 3 ng+a n.h2y 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 cur*p2 x.wcp bkg 81a +jhanj gse1sys(61ve, on a Force versus position (F vs. x) graph, representsg11aghs.wp x*pkjb+6 sen1( cajs28y

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 posi/ku mcrc8,arvld)el +ng2k4+ tion (F vs. x), what represents the work done by th+ru24, mnldra ev8/)kc g+lc ke 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 the object's kinetic e f+mn w(45tmq5tosb k,- hupn;nergy

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 negative, then the object's kinetic x 1sxamd,gr x *v52k;ccfh+kfi- m/*henergy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kinetic enerd6 4 4gcye.tthrx ql z(5 uii.nv*66aigy

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 speedp (oa(s7iynt6 of the car. Which statement is true about the truck's kinetic energy compared to that (yn ps7ta6o(i 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 cad5* w35 zuqxiyr K. The kinetic energy of car* d55iyux zqw3 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 speed. Whahamp8y. +n:3d+lw hjw7vexe fb4(+yt t is the ratiwp3w4jv8tb + nxe yhlm:. ++a h7eyf(do of the final 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 spe9vy 47hc:.yoxvuk8 ,uolz p0qed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass87y9: vq v4p cx.ku youoz0lh, 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 at64o.,zmrpike 3 pl,c+- 0 atiwlc3bm/s. A 1.0-kg mass is moving with speed 4.0 m/s. Bo-w t,mc z6.etpc+lli,0aa3irbo p 3k 4th objects 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 a9mi/ eb.hc cla (e/h2car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fas(abme 2l /e./chacih9 t, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an ellipti hq9/fkvs+ x5asp .w.lg: f9xrcal orbit. Neglecting any friction effects, what happens to the planet's kinetic en/ff x5k+:9p.wx 9. rsasgvq lhergy?

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 principle0aqzn *9)+ kw x6bxanj.

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 as;mk9q -eslc ;8msn /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 gzzh+5 haml0 d2 t 9wtyb+i4 j3lr(fv(h above the ground. A second object with four times the mass of the first tlrvhbw3z i( +(+jd2f0t m9y zg54hlaif 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 spring causes it to strelc/7 n8 t cdy*n-p49nr;g awcgtch 5.0 cm. If another 0.200-kg mass is addpnagclcn *g7d;-8 9wn4 r tc/yed 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 of a s: bgz8cs jgt8)1wd t 6f6hncm3ystem

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 kin5g4m/t3l kojex1ug2 r etic energy K, to its potential energu 45ole2jk/ gr tg1mx3y 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 ap6qqez :caf,o:jq+9 v 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 objec8ac 36so4rm3vo 9x +gqa:y tul4a1wb rt are sliding with equal speeds along a level frictionless s+9v3xa8wa ogablct m 6yqsu3 14:4rrourface. 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 3ve/4v( a*a+pxhg 9sw4 )2 h wxiynevu$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservative ixr(p-mzt;whd 8;7hgforceshw-grdimh x;t(p87z;.

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air friction is presepc0,p; lpj1 s)hzemn o* y(5crnt), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potentiayl1np,ez *(mp0)c os r;c jph5l 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 anm+ta7 a76y qydd gains 30 J of kinetic energy. Do not ignore air resi6a q md7+7yaytstance. How much gravitational 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 gravitational potekfxn 3mr 1*h5dz v7.ahntial energy. Do not ignore air*fv mh7.d31 rk5hnxa z 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 efjx3 9+af -uedjw --zcnergy.

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/noyk09wx v*q wi* yaepn6x.;

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 un (y,bz f.2qz*qxf2 66vslb zzeit of power 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 0cnv9 iry7s*up, 7jy6 zwr-e unot a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times th uv)ulurcb(ywg78o 824gsqr,fu x,s:e work in one-third the time. To do so, your power out gl: c,gqfs4uo7u sy 8 ubwuv)x,82rr(put must 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 constab wo ouc,jap+:uz o1qbs/*y1ho8 3/ohnt 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. I2 pm j)cf hvrs4)k8pq8 19yifvf the object weighs 90 N, how much wov2prvfk8ip m 8ycq9sh )f)1j4rk was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air:xxlge)2e )w66(d pnhcqy2e t a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done byxhe2(6 ytqe6p)dnw :2lxeg )c the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upwpskaa / c8 or:ccee99u:yrn 09ard with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N rocca:as/c9pr9 u8k: y0en e 9force?

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 co0tuk sab2ue rl4; b..mnstant force of 5500 N for a distance of 50.0 m. What is the work domt e u4kbl b0s.a2;r.une 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 with a constant force of 5500 N for asmve 0o 6u+0gxt+inkfcf( 3o : distance of 50.0 m. What is the net work done on the es0k+eno3 vum( 60togxf +ic:flevator?

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 3;t px2uv2x j 06sd h7kugf:hwm 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 ramp, incliy/ a ,5bzy,cmined 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 Sa x6.s0;wi;tgtgyc y6 hrah in a sled on an icy surface (assume no friction), with a 6;x;hiw 6 c0ytgy g.tsforce of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in r.d01xi;tsf7 uke .hy Fig. 6-1 shows the force versus the object's position. Find the 7kst.fu;x di. 0e hy1rwork 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 fo/ er:y;wtqa2gv:yu8 js, ci( srce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work d jcq;ery2s:w 8gv:(t , yuais/one 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 twnnavf 6)mzb.6/8b/2f i huu phe 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 moveh )amwzun/6 /bifpubn2f6v .8s 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 d/r7 byrjf. ,jz0eqg2 the force. The graph in Fig. 6-1 shows f0q 2r7yj.r,ezd/gbj the force versus the object's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg carvj6qb0 h in9o .zj)ud7*rq0xe2smtv0 t (initially at rest) across a 10 m level surface. What is the final kinetic energy onq b) 0xu t2o sdr*j0v 9vq6jhime70.zf 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 o8y;qi,vd l kcr9+a nrcr +p6*of 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the ,6;qd+*cc8rk npra+iryol9 v final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much work is8h/ bqpulh c6 ;tiiu4qmuw9*:azkf9+ required to stop the k:9lah q+ ubz cf;u4pi*9/hmtqu8i6wmass?

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 stop5 ,,plf ewx,d58w-rhpu+ dsip a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the 8 ppd-fsh,l,pr,i we+u5d5xw 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 gunsiy :*v;dx /+;h5bh6zv li cnj propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed wv5;v jh 6iix*z/d+ hs ;lynb:cill 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 ver;pomx,v97zw mb;we ,ho voxvh0 o2q69tical component of 60 N. The force is applied to a b2ovv; ez9h 0ho9ox7 pv;wmq,,wom b 6xox 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 energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay,w l,1nh 7xen8;xkef( t striking the hay with a velocity of 60 m/s. It penetrates a d,(xene7 h nl 8x;k1tfwepth 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 floor to a height of i1vxt d 7zo-hww873vfu2/b ptg9i i:g13.0 m above the floor. What is the change in gravitational potential enp38bii1 tu7- 2dhg9wigzoxv 7fv/w: tergy?

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 and r tohdj 9.2sat5ises 2.0 m. Ifah t5s jto.2d9 the plane 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 tgz:)b74 zu1mc kms;, wiyrt8 fj;-e yxhe spring to stretch 2.0 cm. What is the spring constant?bj 8rxfui,wg7z t; :y- e)km;cs1my4z

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant o- dcyt9)fo u)s: 8hmonf 60 N/m. How much potential energy doy 8)f:usd) nmc -th9ooes it store, when stretched by 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initiw jqth*t+*qwn; 3wyl3ally uncompressed spring with a spring constant of 25 *;3*3w wnytqtwl+qj hN/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 lo2 a 8f3xeci8 hxcg:/stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched poi8 o f3cax:8legh/2xc sition is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0q h 59x)qpg)k,bh: mb*-c fdwj cm. How much work is required to combk hmfqw5pb)dj)-q: 9 hxg*,cpress 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 50-m high slope. What i 2k ssko 1cb 40b5k,,1yyewrrns the speed 42r0syero kw bc1y,b, 5k1nskof the 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 t 4pf+do;oc ; 7jrggny;op of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after droppingy; ;drgng7; +oopj4 fc 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plane. At the bos ezd b*qy:pnd 76ipe7r75i q.ttom, it has a speed of 9.80 m/s. What is the veri6n7sr *7ep. i dqz:q7depy5 btical 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 qm;ko ,*o*wrpqvd3g/ the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energyv3 m op*drqkqow;*/ g,. 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 with a kinetm mk(d.rn 1a)bic energydmmn .)(1bka r 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 leaves the ground with a kinetic energy of 22ddn7 2*3ghrd4 lrd3bz;(fbjam(9 wkw 0 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vert3 b rwldd2gmj(4n fd;bakrz *dw(79h3ical 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 xl82h.(fl kmu xb8i4bim;mt,the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of;ih.8ub( 8tlmfl2,i xbm mkx4 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 plkqtorx, 7fr;ftd+ru8a o(l7 (w5i ) jx3h y7m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, whichrxf 5 l7ryx +atk)q8(;u7wth(ilo r ,fo73pjd 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 (y24ksl7q* xhn je0mt 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 k4tm7 2njhs0*l (ye qxof 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 o +a va q/xcf*-5xbt.xhf 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 0.11 m away from the veri8 3c.xct r z, 7tk1c;qdpdn)htical axis and released from rest. What will be its speed at thckc xq8)137dtrcz , t .d;ihpne 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 ygad5jaq9a4 ) 25 m/s hits an initially uncompressed horizontal spring wq)5a a9aj 4gydith spring 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 hegkakiw;xdl7r v914z v8 h: c,cr 2000 kg car to stop for a red light. What ;akvl8v9hk c:x74cg izd,w r1work is done by the friction force against the wheels?

A. $-2.2 \times 10^{4} \; J$

B. $-4.4 \times 10^{4} \; J$

C. $-4.84 \times 10^{5} \; J$

D. $-9.68 \times 10^{5} \; J$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg objbdy/3tbrxo ..e hm+ ,8 (pzbkaect and a horizontal surface is 50.0 N. If the initial sbp3b8hxbt,(a.e yz r d ok.m+/peed 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 roug.. lwg8rqwu+*q:b k8drh .xzuh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will.:.ug8rqhwbu xzw dqrl +. 8*k it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surface. Thsm 3 4b d/yezzc(a/e+a+e1m lle coefficient of kzl/ (e/+4mlsb1a e m+3zda ceyinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a arzn pj /o94e,:hcsh vxkn;v1 2,)oxn 50-m high slope. If the work donxvkrsv, 2) 94z;nnohce jno ax1, :/hpe by 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 inclinedu0 il98 wrec+q0rzg2f plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of woq r00r 8 +9eu2glcizfwrk to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane incli8j4 n gpxis9srwsoi n5n067ckb )6ypq*cd5b5ned 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 along the plane)6s4 0xjip b5cs6* 59rd sqkpo 5ibncwgn8ny 7?

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 ground wxmky8qc7rw+ c0 f x)4kmrl2t*ith a velocity of 7.00 m/s. What average force of air frk r) 4c7cqy r2fw8*0lmxkx+mt iction 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)o 3n aw3cg5 lthbn*/b-kg boy using energy when he runs up a flight of stairs 10n l5o/cbng3w*b t3 )ha.0-m high, 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 e nd1x d:h-(mtd) f(lq5.0 m/s. What power must be deliveredq1h( -(:exddfmn)lt d 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 runsk39g; acx swt- iq:b6s for 1.0 hr? (1 hp = 74qw3bt ;a9:gc-ks ixs66 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. oy,23emrfwu 9How much force does her foot push with whou 93mf,ywre2en she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average p*gem8.r7s 8nkn) vi tiower delivered by the engine? ik7 )rgn nsm88.ve *it(1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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