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

1#

What is the correct unit of work expressed in SI unic9 g n (vt+vp.tdx :49hdlqwj,ts?

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 nom,0/-pxpxyc f 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 amou/l k/b qdi(;r)d mvbm-iit,-fnt of work yoi mm d qrl/k -bif-tv;/()dib,u 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 liftedtm /,*ms,mhb :vwgjk : 2.0 m vertically and is being held there. How much work is being done in holding the box in thij k* tm: mm,:bh,s/gvws 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 constantsykdcz5 hyhvd;e+* 1) velocity carrying a 10-N object, the amount of work you doe5sy)* d v+hchkz y1;d 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 lifteon7a6uvon)v6h( r kpb+; y8i9 il6emid vertically 3.0 m then returned to its original position. If the total weight 6hrmi68bn(vev7 9)6o iaokl+iy npu;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 tus0 r:-a5kac2hu,g3bt2v gm v*bthu:he 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 gb8 ince-dh87 eravity while the ball goes up with the sign of the work done by gravity while it goes downhi-b7nd 8 8eec.

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, onptw a;0 tie;,4za 3 2xi,fvc vi(l4szk a Force versus position (F vs. x) graph, represents;kac (evi xptzs4twl,z; i32vi,f 0 4a

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 154e gk* 7 lesqb*plkwthe work done by the forcp* 4keq 5b7gwl*sel k1e F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's ki*3rwu ifk,)hh-ei5dp netic 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 n9hb y +pzw;6gkegative, 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:lml:vyh. f-a an object is zero, 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 sq, t 2aqpg18qix 4na)dpeed of the car. Which statement is true about the truck's kinetic end)1t 8ap 4qiq,a2 qxgnergy 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 fas fgh(4- jg9b h(hya5l nujk+.ft as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to cafh9 lg+jhg ((-4afjubkhn y5.r 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 spee 9y+7rjo,o7g ud hj3wpd. What is the ratio of the final kinetiojd7o,3+urg7pjwy9 h c energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s a0fa8m3 uh ;kztt5(z hflkr6 *fnd a pebble is moving at a speed of 5 m/s. If both objects have the sametzf;u(53* t fzhamkf0krh 86l kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed - cb(c+4l h9uwfc2wh*l s:gv vi/n fo12.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Bif h- ( vc g:ov+4/sf129w cuhw*lblcnoth objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of 404s au2: bvmob ni3glyour 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 saa4g3 ov:m 2nb ilu4b0sme 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 elliptic+ dxew+jx m*0r*8e vxwal orbit. Neglecting any friction effec8*xj+*dx+w e 0wvrmexts, 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-energy7o uh 8ru*08lb8jyxya principle.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have negative potex4gy +(qmw9xs * f 1trmzaz:5bntial 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(hs+, p2)mkdbg d4.exaovdt+ second object with four times the mass of +tox)d(ab , dk e d+v4pmh2gs.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 causedwhw/)qs/- lw e0yub8s it to stretch 5.0 cm. If a 8uyslwqb)e//wd-wh 0nother 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 en9agsu(zulk76 kh40we(r (iz dergy of 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 poxabo)4/hb 3kij6j p-,vj. bpwtential ener bw bhj).kpij/v,4xpj o-6a3bgy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving fb 4y2vgm;/i9 g5cqvs 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 8o kc,w2ow(ag : 7sjuuand a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rise:o wa2guu,8c k( w7ojss 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 s:fct/ ff8p) u$m_{1}$ 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 or:7nx7bdh5eq 2if7 e sf mechanical energy for conservative forces. 2sdb7:n 7 ieqe5r7hfx

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 buh1jl+aokst.a q-4l sd,3sc7 kilding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground comparesj,1ck aosal3hl-tq+d 4.k s7 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:t1 w* qnc6x8 k 2a46qcmwqy92ixkcnw ignore air resistance. How 2ky2xqwqw:w6*cti68nxk n m1cq4c9a much gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of grarr k2u20a(daxl- z 8rsvitational potential energy. Do not-su rrk 2 alzrda(x028 ignore air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of enev +bq8,46) ,gyxssud4fq vwlergy.

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 isk l)e cvu+ .q/1damjt+

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 pow fz mpsw:,51tver expressed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit c f0fcjl;hs(2 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 ti 05pmgd6); l6 vxdcslsmes the work in one-third the time. To do so,)6spc6l ;xd0 mdl5vsg your 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 accele ,p 1fd8)r(fd5qiizq gbx5t d/ration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.h/-qq ba,pwz )0 m and held there. If the object weighs 90 N, how much work was done in liftpzq,q)a whb/- ing 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 6cq ddz*sbb*)y ducd(u.+o+tthe air a distance of 1.0 m, at a constant velds*(b +uq.c*y6 +z)docb td udocity 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 constaib39ml :3hvfcrx i1g)nt force of 5500 N for a distancv 13rcmh :lb9gf3i) ixe of 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 force of -.:-vd(wtb+vyobn n ugw5w8 n z/t-rc 5500 N for a distance of 50.0 m. What is the work done t dywww+(tvn b-o-uz:n5v-8 bn /crg.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 with0ogi(4 t -ljhv a constant force of 5500 N for a distance oth-g oi4( jv0lf 50.0 m. What is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m u()8,g q;iu)sq hrz crgp along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of frui*,x pgdey-:w 9ccq v:tzxu :za7r+;vwt slides 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 s(7fd 9w/2 ey2igr pyc0xsgm.nister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle gm/e0 dy sy w7f9cnpg.2i(xr2of $37^{\circ}$ 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 fs3 h3 o rq5-lsuq6nk1q3oh y:torce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves 3r6 n 3y- :o1luqqhkq 3t5ssohfrom 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 gr y)kcfa1m f sv.mov1 6+.*hmkraph in Fig. 6-1 shows the force versus the object's position. . s +kr1fohka vm6m*fyv1 .)mc 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 in Fig. 6- ydftt;)zyl7 +a/ 9r6ts .2hqgd)igcf1 shows the force versus the object's position. Find the d.dc) t2/76fhqy9l+i; ggf r yat)tzs 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 we(e,f.k6f q3 c dgfh1force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when tqd.ef f3kf, we1 h6g(che object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially at reslbfruo+3yf495+ ab/+ch(bv q eg fcf1t) across a 10 m level surf uvbffa15of+yr+ cqlch4 (ebf 3 +b/9gace. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is ,so0yhn 8a g5zapplied to move a 55-kg cart (initially at rest) across a 10 m level surface. 5a ngzhs8,0o y What 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 wiuv5 ehcw+ ob05th a speed of 5.0 m/s. How much work is required to stop the maseu 5 c+vhw05obs?

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 mq n ,e1kkol/rv z/4- pqw0cck8oving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condik k1z/48oeqqk c-0p,rv lcn w/tion?

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 kkyhbgb0/ a)1 a force of 20 N over a distance of 5.0 cm. Wbka/y kb )h01gith 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 80 N and a vert7e3di*uq ye vz(ha;ym10-n knical 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 horizontallyyud -vn03ay*(me1 ;kneizh q7 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 go4ypo m-cux5g q *4:kebs1t. n is 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 stopping. What is the average.n*4ey- 14 otu qcb pomkg5x:s 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 he8.6d 0 ifcnd/qkjsz(-ns y9p iight of 13.0 m above the floor. What is the change in gravitationa qsn.9s6 yk0(fn j i-z/d8dicpl 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 pdcwer;-s44j2 feyt :klane. The plane is 4.0 m long and rises 2.0 m. If th fe-k;djw4r y42:cest e plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to sa- 9ylhsl 5 *9d0k ruhcq.hjj0tretch 2.0 cm. What is the spring co h5aju-cj*0dyhl9qs0 k9l rh. nstant?

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 c n hp,:phko3. 1sq)sljdj js9d3u2g +gonstant of 60 N/m. How much potential energy does it store, when stretchedsjq3h9 sljsdg g+:hu., 1 opjp3)2ndk 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 uncompressed spr3ix3faibvh51meg k331tgl u- ing with a spring constaeu- fi1li1 g53tvgx 3 bmk3ah3nt 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 40x*4yb6,lku )) kvuxe* hcinm, N/m from x = 0.20 m to 0.25 m? henxu 6),kkl*i*b) 4vuxycm,(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 of 15 N/m is initially compressed by 3.0 cllo4 zl+d2 xcn v, uz) *(2zer**lxkzkm. How mucxkz*2kz ) l24c uxvell *dlnorzz(, +*h work is required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope.e xbhg p;6;qr. What is the speed of the slier on reaching the ghb ;;xper6q .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 with an initial 3cbgruzsph/ tui 2).l8y 6 ):b nrba2mspeed of 4.0 m/s. Neglecting friction, how fasmu b:83c 2bt/p uy ar).s)2zglnhib6rt 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 frictionless w:h4 weh3dotqvx4uqo ( . 3de9heb*n.inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the veq( :q.wtx9ud.bv 4eh *now34o3edh hertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. lc rh0tckd, * gmes.lo2h1)5 b When it is 0.70 m above the floor, its potentih,h1m k sd)t ec2*b.l5 rclo0gal energy exactly 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, weighing 10 Nf/o(wu fg zg-7jq)yn2 , blasts straight up from ground level with a kinetic energy of fw -n7)u(/gfq2 zyjgo 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves u3v5 5)vkdirr2 5vxr vthe ground with a kinetic energy of 220 J. At the highest point in its traj)virk3v552v r5 ru dvxectory, its kinetic 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 start;r1o* zx fh7gt ./qmils from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, w .rz;ot1*qmx i7l h/fghat 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.g(,t wh0;dzrb t:v3x o0 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 is 30 m above the bottom of z3;b:thwvt, x( gd0or 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 staqib:+ zhs b;7krts at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coasb:7 k+sz;bhq iter 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 a(4 oluehx7hzt ug340ca s wz),t the bottom 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 pendulum of length 50 cm is pulled 30 cm awa c fh.m)ee7a9gy from the vertical axis and releas)c9e m7hefa g.ed 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 uncompressed horizontal sprr1dg( o02v oqu 4-cgvwing with spring concwvo -g1 rgv0q4 2(udostant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red 9q gr6 05, 9 :dyn*xwksdcxhislight. What work is done by the friction force x,xd wn99sd05h*ksyrq:cgi6against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal surfaz a 6z,ubibw46,o)(j;/l auvs0 o pevyce is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a sowa6,y6bjp z)vo/vis(ub;lez4,a 0 u top?

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 surface0ftl bmys0 20qcbdiyi4;)d :u. It has 24 J of kinetic energy. The frictmy is0 udc0b2:0 qiylfb);4dtion 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-kg mass on a level surfa y-nf9yg i )igx*l18kace. The coefficient of kinetic frx 1gfgia) k9*i8ny-lyiction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the tzj yx 8ue.)2v;z a2hqy ljh;;dop of a 50-m high slope. If the work done by friction el; )jj.yv ;axqy8 2hhu 2zz;dis $-6.0 \times 10^{3} \; J$, 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. The plane is 4.0 m long and j6 ct5iozqb lvk9 sl,b/ 219t6vl9va)r p 1vokrises 2.0 m. It requires 3200 J of work to get the box to the top of rvk /vz 596jla s tvlbo1kt,bpico 9q62l 1)9vthe 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 pq3)o-ta17 4nfu oxibinclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. )pounoibx3af -1 t4q 7What 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 droppedtwt9p 7 1p3pel from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it 1p7tl3p pew9t 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 ener;zzmd9/x lov . x,gpnahls.+/ gl :cm( zyt6+mgy when he runs up a flight of stairs 10.0-mol/v /sm+cytd zxa g+,n hml z 9(:.x6zl.pm;g high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant vel*cd p.0wil+)op hjr5locity of 5.0 m/s. What powerli.r+ jp*ho p05cd)wl must 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 energy are used by a 1.0 hp motor that runs for 1.0 t3g(do 05i :; xgx,x0fxd z.y uja;r*2jvzloqhr? (1 hp = 75x2 qo3y ifagdjzxu xg.x :v0r(*do ;;t0l,jz46 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. Hgh7m/t r i y)bai)exw1 ;xtg-i1u4 1dzow much force does her foot push with when she is41g1bhm)giiyt1dw xu7 t-)e r ;/izax 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. What1r*inx.i 4pzu is the average power delivered by the engin 1*xr4 niip.zue? (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