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

1#

What is the correct uni-na 2uqecd8y +p/mh6 ft of work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is ni+ss nlg:3 h-mrw0(fno 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 ajq(pwb.7 gsh .)jy or; stationary brick wall, the amount of work you do(7wgjhjp y.oq r;s. )b

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 q1* l:5hwz agqbeing held there. How much work is being done in holding the box in this:gl *q15zawqh 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 carrying a 1th*/ d.dv 7 1zs lth;nm8v7m7p1uywqu0-N object, the amount of work you dovwp dud h*/7utv7nt18 7z qmmh.y1l;s 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 liftedt:uivoqf*(l; 9c;g *8lqfk ol vertically 3.0 m then returned to its original position. If the ;(9ql to**8;c:f fqvug i lkoltotal 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 an object do work on the objefwp(no7fs 092zro ds 0pjf5t5ct?

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 breiv2l:ae,vvucrw:s;1 s 4 o*/w0 dyxy gravity while the ball goes up with the sign of the work done by g :4de0w/yc;x s ewr*ls1 vv2orvu:a, iravity 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 Forcxm8ai1z. dlud 7.r1 yze versus position (F vs. x) graph, representsy81z iz.d7x1.ldarm u

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the work done by t(c)8kv bfr1f9 ejfa p23sjq23 ) rrqquhe forj s(f813u rj)9pcbqr)e 2karqv 2qf3fce 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 io5jsg8yiw)aoz9g k 3wuqb 4 .)s positive, 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 negativq:*1jfm;k b)uczc,i za2re+ ekp u*1be, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kinetic energ tjfse d np-k2hk;812ty

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 akhzs:s6 y(lf45s 8aocar, and is moving at twice the speed of the car. Which statement is:a48( hza5ks ly6ossf true about the truck's kinetic energy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has (o8mqwvv5j : rhalf the mass of car K. The kinetq85ojwvr m:( vic energy 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 bach aodrv6nvw)i6(f8 0g5yy/x dk with half of its original speed. What is the ratio of the final kinetic energy to the init) yhgr6i(6y8 wfdvan5vox/0d ial 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 speedf fp2bvm-l:e wb 76ie; 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 m26m:e;7fwl f-b ibvp eass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s.r)b;hl to h3(26 bjxze A 1.0-kg mass is moving with speed 4.0 m/s. Both object6oh)ez t3hxlr; bjb2(s encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a pani pa 8cv28j-wdhdo4ouw(u+ 2eyc, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car havu82w woy+du op-e(jvah28cd 4e skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an elliptical orbit.2-:j/go7 vkyk gk 8gn+z(trh x Neglecting any friction effects, what happens to the prhko/g2 gvzkt-(+gxn8 k:yj7lanet'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 principlehza 6rclv+6p6.

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 ne6.;g2cx)lrvs2jsa pa gative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second obj3c g+u/divijd fe6jc, 4j7c: kect with four times the mas 6e,:juvkgdcd7 /c +fij 43jics of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causeq8cb6 4n0xx8oan +x dxs it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy+xonxq a x88x04dbn6c 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 systeu-3y9,gy u(q4 semkyqm

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,2vi.crfprpnie/ zo 2y(c- ;: r to its potential energy U2nrvpcf2rze/r ;iip(o: . - yc.

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 a su;g3*m/z 2wzl laan9m0) aibhill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are s)nvw2 gkb w4-mliding with equal speeds along a level frictionless surface. They both slide up g) mbvw2 n4w-kthe 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 m; bzoan0c sj:d/:m uq;m zf6xmt2 (0b$m_{1}$ 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 *93hefkjhzayrofldof l:2v8sj *6h 0g6 k,r*energy for conservative forces. fy0 v, akh*36fooellkdhgr*h*s8:f j 2 6j9rz

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 frig8 plc4h )l(euction is present), to the ground below. How does the kinetic energy (K) just before striking the ground c hceg u8pl(l)4ompare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do not ignorq730j 2l 2j2st rrabkre air resistance. How much gravitatb 2jqrr32al7jk0 s r2tional 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 potentimskh5( t i n7:cu4;w/xouu xw0al energy. Do not ignore air resistance. How much7nmok i x u;(:0/4w tc5uuxswh 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 conservati,jx -*tb 9r2btce2z7j f khs+con 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 isxb.qfn4t ab16dikkk 5 p dcm62 yw376u

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 expressed izv9 )7.bq in;oqp9a)y4e+cve lqeg x :n 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 unita .6,fjs6hj4m xou+eh w5qgx. 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 work in onex,4 routh8glf e d8vbd4je 7o 8)v;mf/-third the time. To do so, your power output mou8r4o fxv8ve jb/ h;m) e,f74dld8tgust 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 a1,xtg(jd .wlg cl86gx iy9*g'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 v/ ec; hdaym(e; s;y5qoertically 2.0 m and held there. If the object weighs 90 N, how much work was done in liftyc/ed;hy e;5so;a m(qing it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a consplq3mh ez.-w: tant velocity of 0.50 m/s. What is the work q zewp.hl3: m-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 upwa;j-c59 ol jc.tmengy+rd with a constant force of 5500 N for a distance o9;ltjy5e.+ cojc ngm -f 50.0 m. What is 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 upward with a constant fy*37kt1caji-a 0uyk e orce of 5500 N for a distance of 50.0 m. W1j k*-ay ai0c7kteu3yhat is the 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 upwkvr/f3e1s 2de ard with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on thedvk/3f s2ee1r 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 alon m4ex) yrpl+ p0xt,khn2i ng:0g 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, inclined at8ox0osl(u98d02 lxf 1xhso tf $30^{\circ}$ 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:7hd bf ef ) hpxgqa-0yi p2/(oa9:mok a sled on an icy surface (assume no friction), with a force of 60.0 N ah(i:7p/q omfb)ayafge0xo 2kh-p: 9 dt 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 directionxmlj k6 fxr1 ei4il1.ww ;5y7h 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 froml ewfwmi17 yjl54i1rxx.h;k6 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 inj ;8 /txr, pp ,q4v.;6xj1ckykke x,xlfg( yll Fig. 6-1 shows the force versus the object's position. Find the work done when the obj l (,cp.8qp,fx/k ;4,1 rxkljlt 6v xxg;ekyyject 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 dirm3t1 4k01lhv2 bx;bcpk c.klcection of the force. The graph in Fig. 6-1 shows the fk31 vht bck1pb0 .mcx4cl lk2;orce versus the 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. 650wkt62sm46d vqew04xhdwty)wa. y v-1 shows the force versus the object's position. Find the work done when the object mov dw50twwe 6am6tsv2 wv 0).44d kyyhqxes 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 200fi-b t+ /o z8pseu0mi n-v9dpbb a:4n; N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energyb0mdbv/ p;8az--iot n p+ins 9u4feb: of the cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (init9lofu2pc.wno*u kn:g 2qoy l2 ; o*ef)ially at rest) across a 10 m level surface. What is the final speed of the carc2ollof. nf:uqe;wu 9 poy o*n2)k *2gt?

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 ,pm *t.pb6fpi a speed of 5.0 m/s. How much work is required to stop tpf,.tibp6p * mhe 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 distance 3xugq;ykn1-cq 4 wf8b is required to stop a car moving at 50 m/s undxbkc;3ynqfu 8-1qw4g er 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 1c;*jla* k iteid. 59pw0-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With wh9lw dc.* ti pja*i5;keat 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 cw ak05mb2i/flrd g :n l3fl7.component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is l 0:3 lbadwg./ff 5r 2kcmi7nlthe 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 hath /u:rauwmeoh45 36w xz*8 rpkh3:iiy, striking the hay with a8m5ohkw i i34uwx ar:3hre / 6u*zpht: velocity of 60 m/s. It penetrates a depth 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 heightefw : 1qz;jd cwd2u161uh av2b of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential ededhqbvz;1 6ufu:1j w2a2w 1cnergy?

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 pla3t6iorkj(0gk-:j a qtne. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was drg ttaqj:k oji k630-(one 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 the spring to str5gvc 0z4);;dtmk4isy )hffi i etch 2.0 cm. What is the spring constzf;tmiidfh4 ;k5 sc )iyg)4v0ant?

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 of 60 N/m. How much p m-kw+t+x iso+(u3liz otential energy does it store, when stretched (xkom3+ tw- ui +siz+lby 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 uncompressed pg ny/l8 ,cix2spring with a spring constant , n2gxpiyc8 l/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 conso csj/dq17 +vhtant 40 N/m from x = 0.20 m to 0.2 d7o/q1jhcsv+ 5 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 constane63eysrb tl32.ph7phnts( i,t of 15 N/m is initially compressed by 3.0 cm. How much work is r6 rh2t,(.s37i 3 seynbehpl tpequired to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from r16wfbqki6llrx0olt 5m+ j0 u *est from the top of a 50-m high slope. What is the speed of the skier on reaching the bottooj 6rx lm1luqt+5w0kl i *f06bm of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of rf,w5d f/ cyqzmn(f )*a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevation),*( q 5fmfzwndryc/f?

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 rr. cum6r;sc1nw.cc 3the bottom, it has a speed of 9.80 m/s. What is the vertical he. s cm ur6ccc1;rrn3.wight of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor ix*1 *rg5wp 2vi2ca fhn:yjs2. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic enerhi2ji :cp2gy5 fw1 2v asx**nrgy. 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 grounuo5xoizs4 ng) kb)x8mmkr6 u;)1d;4v l yul5 ud level with a kinetic energy of 40 J. At the exact top of its traj5ol)m8sb4iu ux y)ov4mzkgd ru;)x1 ;nu6 kl5ectory, 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 22n /lrf dtq j7(,smo**9zm)kn i0 J. At the highest point in its trajectory, its kinetic energy is 120 J. *is9r m)l fjzn7o ,ndmk(t/q*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 the bottom o+* hjxm0z zvp0r.46n oakws e2f a dip (See Fi64o zvnxwr.h2 zpe+s*0ma jk0g. 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 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 point 45 m above the( biorei/ e0(c9pfv, smo zz:p(n ;sy9 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 b n0vi:,s((e r9 s/; b9p(cozyefzimpoottom 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 withdf46b /uvs /tau7qi 9f a speed of 25 m/s (See Fig. 6-2). Neglect /7a9ti fq /dus6 uv4fbfriction, 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 bkb,v kn */x3ei(oap/ eottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cmh gf1gx)u4d 52 v.x tcct5zo*f is pulled 0.18 m away from the vertical axis and released from rest. What will be its speed at the g1 xo4duhcfxtz 2f. 5cg) *tv5bottom of its swing?

A. 0.243 m/s

B. 0.649 m/s

C. 0.973 m/s

D. 0.811 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed hori;s /;vglaou). dy26i zlrwy)we 9g d1kzontal spring wi9;s)dwu ) 6io w l.ylzgeaygk;1r /d2vth 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 her 2000 kg car to stopn,w5 -xakc6i s for a red light. What work is done by the friction force5,sxc6n ak-wi 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 agfx jw: q;b2t+nd a horizontal surface is 50.0 N. If the initial speed of the object is 25.0wt2qxg:+f ;j b m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surfacewspngnpuce9+2 gu;) ,. It has 24 J of kinetic energy. The nu,9sp +n geu)p2g;c wfriction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kgp(q -kd4bum4c cn+5as mass on a level surface. The coefficient ofc pb5dn4aq4 +s k-c(mu 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 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 qptm9 8i;nv x:ou8v, sn;jvs5from rest from the top of a 50-m high slope. If the work done by frictmvvq8tuj98 ;spn s5x,:iovn;ion 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 inky w+a5 /od lo:z,bt.tclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force ot+ :z.k5lobd/ aw,ot yn 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 ofuv+;w f3dq b;k a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What qfwuv+d ;;b3k 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 drofgor89oze ,tx dvi. h 2u0+2ccpped from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. c8fhgou20 vr o2t9d z+.e,cxi 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.dn1p zo4(v *4z)zy kmh0-kg boy using energy when he runs up a flight of stairs 10.0-m high, i k1op(*hmyzdzv4) 4zn n
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 cotqpa wa*yu+n6 7- r7u+eqiua9nstant velocity of 5.0 m/s. What power m 7uq7ruit qanwu*9ae6 +py+a-ust 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 enerxtb: (4,z ws,gv,oj p6dkqf 5igy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp =tbkdx(f ,,ws6v pi,5z4:gjqo 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 5003b9p0;yp wf tq *ip;dd W while riding. How much force does her foot push with when she wy if*qpp;3;pdd0tb9 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 25qnjsf v qv;g, /ov0qi; u 40mv*vei-0d m/s in 7.0 s. What is the average power delivered by the env0jqn,v4;0 me vi;oqigvud-*s q 0v/fgine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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