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

1#

What is the correct unit of work expressed ;0fn(nukhknai(7 ts 8 in SI units?

A. $kg m/s^2$

B. $kg m^{2}/s$

C. $kg m^{2}/s^2$

D. $kg^2 m/s^2$

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is no; 65pj yxcu6 0zgq7iuw motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amoabm ( )o.:nqt bt7;xjyx)o2weunt of work youjetn) )b2axo7 ; :o b.qytm(xw 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 ve)ki2w 3jvde p;)9 o8mliro7*updh i8lrtically and is being held there. How much work mih8or3ewdj 8p2v *) pl 7ik;)uodli9is 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 horizontally forward at a constant velocity carrz y11zjsof8) xying a 10-N object, theyzfjo1)x1z 8s amount of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to its original po-0kdw 7ctb9f nsition. If n0 -7c9fkdwtbthe 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 azzf3 i6;3r3paj: pok1,egc jen 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. Compare thyny08x-u*+ez f;*mbplk.m kee sign of the work done by gravity while the bay+u *nkek-l .f*0xm8pybzem;ll goes up with the 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 ve+61mttt2h egu3 grud 5rsus position (F vs. x) graph, representste3hggurtud5 1m+62 t

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 represent )q e(p9l+ nlddurg1b(s the work done by theq+d)prnb((lg9e u 1l d 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 positivw5ss *beqwke20/9h 7p6i/5jxabz rth e, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negati7zu scy, eah l1(; h)l;ndd*cave, 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 z1 bx/qz ; uf w50b 5fyo-mduchg.dw.5xero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the 4bb,t9 s1 5z7unszsckspeed of the car. Which statement is true about s7b49ub, tsz zs5ck 1nthe 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 haj 0+porek 7ouww 7o4b8lf the mass of car K. The kinetic ewok 7+4 8ju eboo70rwpnergy of 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 lxb6y9k i52vb original speed. What is the ratio of the final kinetic energy to the initiab2lby 6xvi5 k9l 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 g-mhas56l/0x l7 fmjuof 5 m/s. If both objects have the same kinetic energy, what is the rat-gaxf lu0s56jl /mm7hio 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 mov7ix xe6ig,r./:qgv 1 ys2cx qaing with speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter thi qqrg.vxces17 ,a2x:6yx g/ie 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 yxp:.g: bjpoqs:mplkxztx: (bh;*:r 2our car in a panic, and skid a certain distance on a straight, level road. If you had beenq2tbm.p:s o: prb:h:jz*gx;xpx k(l : traveling twice as fast, 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 mabx-u bw,sd8ah;hx(sp;z4t ,*p yo x(hss orbits the Sun in an elliptical orbit. Neglecting any frict(azoy -bwx;u*hsp ,t hbx4d8xhp(s;, ion effects, what 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 principlez cwi( 6(gr/njtgo :cy r:w42x.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; kx^2$ is

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have negative potentiayfz+y2 r:l 99j.moty hl 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 ground. :9;ozkfnaywi 0ds5o* A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared f ooz n0y9 wi:5a*sdk;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 ih .9i9kyxc opd.5r j8ut to stretch 5.0 cm. If and oxc 9r5pjuhk9i.8 y.other 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 of a 7k 3n3v smk0udid81t asystem

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 potel99 i),(qhxj0.u8 vhrfev4dkdxip *mntial energy h*xvhk(8v, 09d qfejiir)pd9x l m4.uU.

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 oeizmka 6m mp4:gp(z:4hl.se uag( 61pf a car driving 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 onp30ysl,,q/t9 a rij object are sliding with equal speeds along a level frictionless surface. They both slide up thq9o3a ,0tj/yr p,ls nie 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 d; mfx 8f )dbp0;pc8wb$m_{1}$ 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 c v izkdt:kn(6ddh;c5: onservation of mechanical energy for conservative forces5:ck:;ihnkd6 tddv z(.

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 bioo0 jb)37q xguilding, through the air (air friction is present), to the ground below. 3 b0)7xqgojio How does the kinetic energy (K) just before striking 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 distq3mkk 8cm540pdj50 )cm wkyomance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential jmw 3o0) 8kdckmk 50p4y5cmqmenergy 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 J6x+x 2aeuol8t of gravitational potential energy. Do not ignore air resistance. How much kinetic 8+xuelatx 26oenergy 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 conserdt*xwbh (f938my kl*8ww yru+vation 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 is.yx) )qqnzia 7o4:xiqnk90cq

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 exprgre7mxf)1-d5s.yz *in ak mo7essed 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, whicazt jn4j097 8,7lwuyfpx)m tkh is not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the worm -(p3i yf8pkdd)u7-cdr-.pgy - 5xcae yxl:o k in one-third the time. To do so, youyxc p-pa8r)-dy7xpmcd-gi5:ku - yo.dfe( 3lr power output 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 constant acceleration, the car's en6aeh skt48tc2gine 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 tznm a ;vut8m617.pumthere. If the object weighs 90 N, how much work was dov71m ;8a tuuzmn6t .mpne 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 dis8g 3a* s5fsamo a+k3oytance of 1.0 m, at a constant veloga5 mfs8*+oa yak3 o3scity of 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 Negn yd,mn8u 5; k-pt*w1la6pj for a distance of 50.0 m. What la wnnk -emp1*udgt65yj;8, pis the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled ke2d/5lvywyr+d 4e;ns40vf2 vjch , supward with a constant force of 5500 N for a distance of 50.0 m. What is the 2fv0;rew+nkh/4dc vs4s d v5jl2ye, ywork 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 wii.jc +x6 ivj.uj-u1lyth a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elevxj1i.l- uu.i jyvc+j6ator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up along pj 5ns+xi6 d4fld8bmy8,l ce*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 . ffb -2-zvdebslides 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 Sarb43du dmo6ezs 3+3.a9f fcziuv1r3olah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an lf oav3b1s6m rd4zz9f+ eu3dcu 3.3 oiangle 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 b e ed8su:y,w ro9ibw73mf/.mgraph in Fig. 6-1 showfe7 byw 8o, e.im /:urmwsd93bs the force versus the object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fif5dt j;fi h4oojy*hm g gt3n /*hti7;5g. 6-1 shows the force versus the object'sn5ftht i og*3h;/;4y *7 mjdg5iofjht position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an objecwhek2 */ c4mpat in the direction of the force. The graph in Fig. 6-1 shows the force versus the2we a4kc/mph* object's position. Find the work 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. The graph in Fig. 6-n) qt, rd,jwq,c.qxfm.jlhaz8.po9 3 1 shows the3hp,aqoxwd ljq8nm q ftz) .j9, r,.c. 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 lr zcfmnu0-i: ,a7x9ua 55-kg cart (initially at rest) c ,7il- 0umafrn:x 9zuacross 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 off0;m f4rif b+ q*jlmy1 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final s0 q;m y*ljb1fi4+f mfrpeed 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 rtu 5y a2:/dprnequired to stop thd p2at:r5n u/ye 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 initially moving at 25 m/s, what disj8w 68ptck 3uf( sd96j3jhm tbtance is required to stop a car moving at 5f8k 3cjj36hpsjb9 ttd6u m(w80 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a forc8 tx+ufr(fq2pe of 20 N over a distanf(+ xtqur2p 8fce 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 0egf-h,*irtj,:a vi no lcj5 :80 N and a vertical component of 60 N. The force is applied to a box which rests on i av,:, jfc-et:0nrh5i lgoj*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, striking thslxra y .kb5(312 /om ibtfu:he hay with a velocity of 60 m/s. It penetrates a depth of 20 ci3 y1r(t:bouh xm bf5.s/2ak lm 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 fromf xdnais x.l5 d*d;90i a height of 7.00 m above a floor to a height of 13.0 m above the floor. nla9ddd s ;*ix5.fi0x What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4 ;jjwobg3s3j 7- vr:4x;h6ehbb fp+np.0 m long and rises 2.0 m. Irhs b3f;bp;g3xep7+ hjjjw4n o-vb6: f 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, ca7h nyfxo :f61tuses the spring to stretch 2.0 cm. What is the spring constant?fn1yf 67txho:

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 82mb1e dzr03i d5tdks constant of 60 N/m. How much potential energy does it sri s 812dtde md53k0zbtore, 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 ah bylj+ioe *oi 5 2wjob rtuh+*.d6a8)n initially uncompressed spring with a spring constant l*oiua6bo. h j hd+8ie *r2+wo)yjb5t 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 constant 40 N/m from xqr* q zk e m8/l9g,bp-b5)jgrkcv(qj, = 0.20 m to 0.25 m? (Assume the cr,jk -m98 zlqgrjgbq(e) /b,q*v5pk 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 constanhm8 svgj-t t/0-l8v o6pi2hpft of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4pis mgfvjpvlt 2th-- 0oh6/88.0 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 bn0ayave568i1 r7ck cqs4r; sthe top of a 50-m high slope. What is the speesre0sc ycb 6k a54 qirn1a;v87d of the slier on reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill w xno+tkp7-bh1 4 vx-onith an initial speed of 4.0 m/s. Neglecting friction, how fast will she be mox7h +k1tv-n4 onbp-oxving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined p38bps q (nkz:bs3v* 3f4m zgfylane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of 8 :fy 3sn4k33qzbmfb g*zv (psthe 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 vz4awfnsa3o0 c 6yo5fa)e91 nthe floor. When it is 0.70 m above the floor, its potential energy eefz4yaowa0a 1vfc 9s6n)3on 5xactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighingy,9ghwub qd t0/c *+n vw.(fen 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 14(e*chq0nu, v gwd9. fyt+/b nw0 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 220 J. Aq6/w ;gdx kw9et the highest point in its trajectory, its kine/wq dw69kgx ;etic 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 tb-f7h35hx h xuhe bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rollhhubx-3x57hf 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. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a j kkwdfp-di: 9mvg t7ry(dp5 iv:94o7point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of 7 ij9i4 kp9ydv:-kdt(g :v7 mrd o5wpfthe 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 botto*q.d k mkpdqil9 zyk93w4cg .;m of a dip with a speed of 25 m/s (See Fig. 6-.m9ld zk3*k9k.p q4wgc;qyi d 2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of ixaki(a r78)exts 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 axc2+lhhy,qnxli522 boifh7hg ( r7 o9gis and releaseo2r2qyhl 2h5ncf +g 7i li9 (g,xhboh7d from rest. 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 uncompressejb)(5vr(9n )r)zji y)4skoa i c-weg gd horizontal spring with spring constaeg)(9r(k 4)zi bi)nr -w5jvajgysc o)nt 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*1ks;7om0* zstxzb ph m/s, slows down her 2000 kg car to stop for a red light. What workz *szos;1k 0hb7xpm*t 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 object and a horqh 0/lbr kt(k7izontal surface is 50.0 N. If the initial speed of 7klkb r/qt( 0hthe 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 rouv6( ( r2ex t3de.fanwsgh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it sl26tsrwfa3e. v exd(n (ide?

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 surfarjbx3 jx;ms*(qhk)a ,ce. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is thm,xhjx*a;jr b kq)s(3 e change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. If thd:pp ) mvvmt6jct5)* y1 waws*e work done bytv5tvwm1 ))dcpjpsw y:* 6*ma 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 inclined plane. T(v w.vpbhmnv4he i06 b l5g-u(he plane is 4.0 m long and rises 2.0 m. It requir v v6ige5pu(0h.mblvwhn(4 b-es 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20e abrot v4: 2rkf1:d y3eigove horizontal. The coefficient of kinetic vfr2:di43yto:erk1 gfriction 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?

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 frw*hx )2erhh ;aom a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frictioexharhw *;)2hn 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 up a flightlym , a; a/qrhkzg0r,; of stairs 10.0-r;a,a mgr0lqh ,/yzk;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 wit2o3 sd)1 t wpf4d46hvgwm)y rtb)tx. sh a constant velocity of 5.0 m/s. What power must)ftbd.)s42 h g r s 4d13yv6m)xptowwt be delivered 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 enerfw osw0gn7v dxm: ,v+8gy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = w7 v:n fv0+dosm 8w,xg746 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. How much for0w*x4xv 76niahpe*jv ce does her foot push wx0en*6w ahx 74*p vjivith when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 sj1 sgydet8q; +. What is the average power delivered by the engine? (1 hp =dt1 g+j;eq 8sy 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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