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

1#

What is the correct unit of woh4p6kiu. rg3tnn, a/vrk expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is no 6hc2p sq )+;kz6fq vmcmotion?

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, thvgk6 0a6 p2+ qbiryo;fe amount of work you dovb2+o rk 0q 6fyiag;p6

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 being held kw2x(gd y1jm-there. How much work is being done in holdi-jgdx12 wkym (ng 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 horixht)hld 3h +8ezontally forward at a constant velocity carrying a 10-N object, the amount of work you dhd+lthx 3 )h8eo 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 pocfa2, n/rgto i7msl) (sition. If the total weight is 2lsa) t(cor7/, gnifm30 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 an object do work (z y8yle jppp/w 3+5adon 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 the sign of the work done by gravit 2 gixmvk),7l)2 ;mkzldq1bmly while the ball goes up with the1mm) m;vd kk2l zxgb,7l)i2ql 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 position (F vs. x) graph, *2q6hz5pbxba z* w6lurepresents*h6lzpbaqzx 5 w*b6 u2

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), who wo x.8evtj59at represents the work done by the force F?ov.8j9x 5oew t

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 objec7*6v8 xz z( svdswbi42jbs /tst'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 negative, then the ou* 1(kruan+kc5dlj6 cbject's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then tqk qfgct8w/6/c n+bll.0h0 sghe 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 q)0okkj a2u c;,p,f qitwice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of)okf,j c2qpki ;auq,0 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, -d,lgt zclh(,and car J has half the mass of car K. The kinetic energy of car J, compared to cal l,,cz h(-dgtr 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 sp( zvrvpctml75pyzgt,d* 8e0,eed. What is the ratio of the final kinetic energ tdp7(0yzg,*58cvp, vzt elmry 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 spej;wq edk n8rtr4-p.0p ed 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 mass to the roc w rpj0q ;-n.kt8dpe4rk'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. 9 *, l-nbn;r.dvzrgx qA 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object rn -;rqz9,. v* xgdblntravels 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 y w zcdyy6q;3)of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditiocz yy;d q6)wy3ns?

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 joy2ptcey j9c 7;2cddpi2/ c3elliptical orbit. Neglecting any friction effects, what happet7e3p2;c 2y9/2 jipdjy odcccns 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 principb,at+2c c(t eule.

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 potenttuh3u wjfcim+y7 8+u2ial 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 fqep9(2f xynm2 rom rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object comparedqf2p(xn my 92e 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 attach;gxo3iju ps)( ed to the end of a spring causes it to stretch 5.0 cm. If anxs g); u(3ipojother 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; io70u snh0yq 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. Compare its kinetic energy K, to its pote6xtd*3uf vlo 5f 8p;jential energy x56ev3tfp;8 l *ujo fdU.

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 mi.eyf nit5.vu u4a 0(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 h+,e6c w:5s2y ql esjfmeavy object are sliding with equal speeds along a level frictionless surface. They both slide up thef c+q5wylsmj:ee 6,2s 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 n14 r;4mf9w epm x 7gi4vejoa-)nacrf6j-.fq$m_{1}$ 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 cb sw+ ch15u2vt )8ccmmonservation of mechanical energy for conservative forceswmct2u+ cb) 8shmc51 v.

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,-gssc8y+:i:-z si. tap1wfp g through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to thi-z.iatg sy-wsg:ppf s+ 8c:1e potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of ki+5jjqw qp,- actf i3f3netic energy. Do not ignore air resistance. How much gravitational potential energy did the bal+fc- jqjipf3a35qw t ,l 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 of91iov 5 ksj(en gravitational potential energy. Do not ignore airk15e( joi 9nsv 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 con ,ng* 65c f65bze.n1fo gdjougservation 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 isda6yl kk3.m8 h;-b::)uw xaqnldk( ia

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 expresx-. 2ldxcvf0 n:mp 1:ba3flnnsed in SI units?

A. $kg m/s^2$

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

C. $kg m^{2}/s^3$

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of powdg+d j ot *jjpx0c,((bcowf5- er?

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 .0f fxx- ags9 b d(img:qrnl.2times the work in one-third the time. To do so, youg.fnmgdq fx09(a l: xb2-. risr 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 acct(8kguih 24/tpsb rcb. .dpv1eleration, 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 vert uart+q-eeg*).*h inyically 2.0 m and held there. If the object weighs 90 N, how much work was in.- r +y)* qgeeu*tahdone 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 upuu ) gckab2w; hxv0oz2,:p7fa in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight zf vouhx2 k)7a;gpwb,: 2acu0of 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 b8b8bgkii px p:mc -8)force of 5500 N for a distance of 50.0 m. What is the work done by :)icb8km8bx gpipb8 -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 ,xr7 j5dm l7yj(yolcef-5: qnN for a distance of 50.0 m. What is ther: d coljj57-,y (nm5l7xeqfy work 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 with a covv nop,g/nt 0ykwvt,44 9r2x z*hl,g znstant force of 5500 N for a distance of 50.0 m. What is the net work done onn,w v hvtg x9*2z/zopn4lvk, tr0yg4, 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 along a qz 6mc/piiks( vjy n her: t1s9t(9:4c$37^{\circ}$ 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 rami2qa , vebgi m:lw4(0n0 cu/:qni c5g*8 zewlcp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume no fiyljq.n0rwjh g 12-6m riction), with a force of 60.0 N at an ar6-lnmj.y j qw 2g0ih1ngle 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 thsawynx8 ky 6*u1pps9h 6 ;f *:d(aqhfhe direction of the force. The graph in Fig. 6-1 shows the force versus the object's posit;hhuy*phsfspx:6k 8and1 aq f(*9w 6 yion. 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 objec2/qk3 . l.yxms.ylub ;mbvru7t in the direction of the force. The graph in Fig. 6-1 shows the forqub7mysr2l u/k mb;.ly.v x.3ce versus the object's 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 object in the direction of the force. The graph i iaa(x21w36woohspx 3 n Fig. 6-1 shows the force versus the object's position. Find whas(63xx 23powi oa1 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 direct2)dcps *ca2ut)uc6 la tmwv)9ion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 )a6usc uw)a29dm*t lpvtc )c2 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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教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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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 bu 8f3-j9qt u3t*ljsn-kg cart (initially at rest) across a 10 m level surface. What is fqbt3u3 *9t jsn8j- luthe 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 movexkx2;(k t; +dfbx/zs j.6geiy*8vw gz a 55-kg cart (initially at rest) across a 10 m level surface. Wha x;ix xgd6/s ;wbt.z*zv2yfjke( +gk8t is the 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 is required to s7mrxms1; 3 p c3hqc0jfto 1hxjm0 s3qcm fc3;pr7p the 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 n 1zo5irbynl r2d7q0 8k6d2ja25 m/s, what distance is required to stop a car5ddzl qk 0yao1n67n rr2bj28i moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. I dpltxs3:okn-/3 fe3wl4h 5ovt is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming t- :lspw5 vte33 f/lnohk4xo3dhe spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical compwek 3(5yvvv 5bonent of 60 N. The force is applied to a box which rests on eb 5vkyvw53v( 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,m24t h 35etq o2tkz)q +urpjs shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stoppi2ts)+, m tzequjtrq 25ok4 ph3ng. 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 hei3eukl 65trr fm eyt3: n*l/)xwght of 13.0 m above the floor. What is the change in gravitatwrl3e/u y3f6en: x)k 5tmt* rlional 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 inclit.:f agf .i tnv*vju /miz7j;+ned plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was df7t.vm. njj:t *z+iuf/iv g ;aone 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 sprin:gjio m+jn.9/ bkv- uwg, causes the spring to stretch 2.0 cm. What is the spri9jo imwj/ub+ .n:k-g vng constant?

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

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

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized bgk+cl;g ;kuc7t: )93m)nta saw*,k z zkr:yx cy a spring constant of 60 N/m. How much potential energy does it s *axk7st g,3tu:c crk:k)kz; 9a;+ygm cn)zlwtore, 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 initially ugiy2oh0v77t p4lxh-v ncompressed spring with a spring constt0hv27l4xy7- ihvp g oant 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 l(w5/q6s3o- qz eqmpw.fc 8 rlstretch a spring of spring constant 40 N/m from x = 0.20 c 8lpfs 5rwmeq3 /6-loqz.w( qm to 0.25 m? (Assume 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 constant ofl7kn ufhrd+p3;9 8loc 15 N/m is initially compressed by 3.0 cm. How much work is required to nu79 pd l8ko+;lhr 3fccompress 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 from8bsdqj wr9)k + ;k7m bs3)xhcm the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect frictiob3+jsm ) dm;)kwhs7qb rkc9x 8n.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial speed of 4fpve :rar90h+ .0 m/s. Negle:a9hev+ r0pfrcting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionlltnk:6 jc0 t;xess inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the pla0:ntclx j 6kt;ne?

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 tm3 lwnv,ed w2f wbb/a 3mst);9he floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is nadw2mb3 mwf;b3 sv ,e/lw)t9 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 kineticr. t)1+rtxy(b vp- c1m5zcbpu energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it risrb(1bvc rz+p1 xmu.t5p t c-y)e?

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 offe 7bmrz):cbx -y (:cs e3op 0grg*g9l 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its gzr r*ce ep(-os70cfl m3g:b)y9: bxg 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 r/ , k7;utfhm;iv-zoei est at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the s7 hkfi/;- ,o;vtzmueipeed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts9 cmp(s6yj j fvs :hea37aj6p/ with 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 the roller coaster at the top of the next slope, which isj 3fyssp7a ajmpc/:9jvh 66( e 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with4oxaj )hfbp.fg0mnp;+8d 6 97 cvgbzv a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the spee nzbf j9v8p d. ga0h4+m7xcf;pov6g)bd 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 its swingf sz1edt fb0x5;5sl-bqk ho6.*u31ct;kkd yu (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 0u(yycy) )y/( q1 lgedj8vaouthe vertical axis and released fromdy(u )yol)1egu8 0v y yq(/cja 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 uncomp-f lqnmkf-g1 ,-z3 mmm9hfun4 -q4co +f nix6oressed horizontal spring with sp-f64m mq nk+h ,zmolf-f 31 qn-fnmx9iu4 og-cring 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 20cc inhd 17.pj900 kg car to stop for a red light.dcjph1 ci9.7n What work is done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a hor,err )zp a )5)rry2)4: erfxil sfwjd*izontal surface is 50.0 N. If the initial speed of t5ad2:w)*l)r)z fxse4r) f,jrr pry e ihe 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,9v d6 *ker )-hkqs36d; lmkdm:7ezmtm level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will l k39m rs7d6e;mm 6zhddm-)v:ke q*tkit 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 surfaru2 ;7ygmy6 swq4f 8dh;*1ly4qlgr vuce. 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 the change in its kineti 474fq ygqmlr;suygdr; uv2l*6yh 8 1wc 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 ws;hi 85 vlmr 8p0xtr450-m high slope. If the work done by fritlvr58 mrxi4 s;w80 hpction 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 planjmyoei t9 jhst68,tgkb(6/y1 e. The plane is 4.0 m long and rises 2.0 eit98/g6hk,6tbyyot m 1 j(sj m. It requires 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 1+ grcefn;: wwm z916xs1(fadonep6jtop of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass c6 (+nropadmgfw sfxe16wn:j ;91z1eand 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 from a heightena +a,3o8d 6 :rvf3o2hqvb psx5ras9 of 10.0 m, and strikes the ground with a velocity of 7.00 v nr6a,as2ohaq xpd5se3+b:38r ofv9m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flo9bo )adv8oe: ight of stairs 10.0-m high, i v:a8eod9 )oobn
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 t hjuovwo l0--rsw h2(z5us 5.2m nj0dvelocity of 5.0 m/s. What power must be delivered to the objw ho-o-l5 z5.umt20n0 svrdhw u2s(jject 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 moto u3bq-;m, pv+uen 0kiqr that runs for 1.0 hr? (1 hp = 746 Wm+ nqiu,0 ;kupev-qb 3)

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 vttb2: 8nkk7en6fkp * much force does her foot push wite:kn p28fbn7*t kkt6 vh 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 s. What is the am0 (n5p6 h w9rafgugd6verage power delivered by h 5a 6gn(u 9wfgdrpm06the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95