Physics Unit6: Work and Energy - 无忧得胜-网上国际课程 (5edu.win)

1#

What is the correct unit of work expressed cc n;,4jy e:g9:ojl7yc * eiewin 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 is9 -xet;, /ese k9qc9g/u3m(pdfpyqcs x 5nwa : no 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 amount ofbnw 0 7tjzqncqni83; * work you d0*qc qwj 3ti8b7nnnz;o

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 )duj,z0 j++qg ng2qyq held there. How much work is being done in holding the zgjj)ng++d ,qq02yu qbox in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forwkemmifmzx9db ljmj1 0nd(n 9:t1;7 /rard at a constant velocity carrying a 10-N object, j1:mtmrij19db n0znl ;(97d/e xkmf m the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 *to9a* tf pws:m then returned to its original position. If the total weigha9 ts ot:*fpw*t 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 apo4 mo*ms 7vo3n object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by gravity whyb- mf*nq)1ndile the ball goes up with the sign of the work done by gravity while it goes down)-dfqm y* n1bn.

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 2p.eqbf zd .+g(F vs. x) graph, represents.f qe. 2dbgz+p

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 d/d b3, qk8 ly)ozpx1xvs. x), what represents the work done by the fo )xl 8q dkd/oyb,xp3z1rce F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kinetic en wn,xk0;wp.oy n/epy;m8n 2 wfergy

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 ob sqx9ro7/m p:z+p* e1fcc; yrk qzi*i-ject is negative, 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 aqs+ i4ah5 ddetv 3dqcs edp;(a/b5 /4object 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 oroq/r3a -vi1. ltn 9 xr)cbf,)nkdb -as x*.tthe speed of the car. Which statement is true about t.a qt1k b-))9nfb dtcorl .irr3/xo -n,*vsax he 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 4up 85 e6ju*lzkz va;nas car K, and car J has half the mass of car K. The kinetic energy of car J5z8u *ejl6n 4zpku;va, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of it . xqb*wpx+bd+r9 c1nbs original speed. What is the ratio of the final kinetic energy to the inc+9.bx+bw qn1bpdx* r itial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a spe fjlv5:,,pwhivd76 ueph5/l ved of 5 m/s. If both objects have the same kinetic energy, what, v/,jhv 6w75e:lplhu pfi5vd 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 2.0 m/s. A 1.0-kg mass is moving with j/bcf;;iol 0kr4sa, hspeed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which obje0ahlb;ri kj/,s; c o4fct 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 panic, and skid a certain dist vbm6l4il + 0-gh.uh x)2 2xunuc;jtalance on a straight, lcal n.2v6il 0uxj)utgm2x 4 -hhu; +lbevel road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an jj qmlbd8 cc nb37,56welliptical orbit. Neglecting any frictiocb7ljc,nj 5 q86dmb3wn effects, what happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energyavvx 82od3l 3bybfm3hq(iyc.mz/-)u 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 systemk, tw* 4ql5xpb to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second objefwb+4vfq.q vwnw2 m2uy*a y7/) wsnc2ct with four times the mass of the first if released fr+4 nq. c72aw fy)/yfwnq2s*wv2bwmv uom 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 spdsstr2*m+y- ymq (iw*in 8)csring causes it to stretch 5.0 cm. If another m2ni(y8 *dt+c y*- wqri)msss 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 energzy6 vnu*ou (s23va.vc y 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 t-*)vj inbxo u)0fxj(a5, 9yb* okdpnkree. Compare its kinetic energy K, to its potential ener**j,bkfo) (nj x)i -5kpd0xano9 buyvgy 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 t3x-t 9 tqwq.v( ste0ga car driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal speedk f i/2gtnjy78s along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height7f nk /t8igjy2?

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 em5rd5bn1 8xif dqo9, $m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for ooayp1r g0 u4)vt-3lri9/d vrconservative forces.g trv1ou30)9li /v4r pr-ayod

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, pd o 8t+6khl63g0vflvthrough the air (air friction is present), to the groulv6g3vod+0 t68hlkf pnd below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do notvj:l uc *jp(j)8kjj;i ignore air resistance. How much gravitational potenpkjjj;8*j:l () ujc vitial 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 lomgsr; z (6b,doses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinet;szm6 odb,g r(ic 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 ene+d4ztzsgct m5pwc;k 0y+ p)f/rgy.

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 isvos7hh0 dk bsakbb+fal2 b*+ +sw+ r27

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 in SI u5z)z5hbznt-e/h b 3oenits?

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 r+ a, giq5fh1z /xpyv.)g;kj ois not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterdayiv gb+xdn tn+17s4 e 9cc4g s:n;rvkw), you did 3 times the work in one-third the time. To do so, your g g4vebkrd+n;9w71t4cn+x: scnv)si 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 accelera)u+z l(kmv7wfgxi uqg.k m rwi/76/5ktion, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the objet* q s-a8fyl1-cqpj k q5ytl:s)(ece4 ct weighs 90 N, how much work wa c*lyt k pe(5e lc4)s1:a8qs-qy-tfjqs done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, ,e 7f 4h6h3w8bhhw1b+h s jucmat a constant velocity of 0.50 m/s. What is the work hmshbhhu 3ewc4 w bjfh1876,+ 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 kk8ebk3nw8 m/a constant force of 5500 N for a distance of 50.0 m. What is the work done/kkn38 8mwek b 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 upwar8u7s 4g.nk9n(a -udfbw y9r5r 8sqz iid with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevator?.u8qnwg9b5 y( zs n78drirfks-9ua 4i

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500pbif50-7.i dk r;zb iounb3+9jr* ya i N for a distance of 50.0 m. What is thu- 57;z yai9nd*rbrp3 jifib0i.k ob+e 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 vi;zm4.ipzs-6.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m dow c85 h3 1mycmv8jtzkh9n a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah i6unxkyz h nz;jz0 q8--o3rzv-r d1:pon a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle -n6oo ykdq3- nrr-:z0;1z j uz8xzhvpof $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph iyaf)umq8/ r bc44wwu/n Fig. 6-1 shows the force versus the object's position. Find tr/wm yuaq /fc)wub4 84he work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of l-). , z8fea pm/wbp ky3a*yjvthe force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 -z lpf/ )e wavj y*bam,y8.3kpto 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.amd3wm 94eszgwb-2/u The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m. 2azb - /me9u4dsmwwg3

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 0b*n9(z2y s(oo4gvrfeo8ega. 6-1 shows the force versus the object's position. Find the work done when the object moves from8 zs(fovb*(9 oga oeyger240n 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 cartteb; m y;c(u3s (initially at rest) across a 10 m level surface. What is the final kinetic en ;c;uye3( mbtsergy 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 mos dk:dl )::8qlgz*lhjve a 55-kg cart (initially at rest) across a 10 m:*8s llgk:z:j )hldd q level surface. 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 with a speed of 5.0 z* :eu avyoprc+du,j0),b(bjk87 mjwm/s. How much work is required to stop the,7 0 )jczmbkupojjde8:(,y rauvb *+w 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 mmioqb:1j yj-o 4 ig*4oo0ob5p/s, what distance is required to stop a car moving at 50 m/s und 4 :y1bmjiqpo4oi05*j ogo-bo 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 gunyk2 k.*qi2 o4um8e nyo propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed willone i*yom2.uy 28k4 kq 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 vertic3rcfb-uxgmg ;/ag (6/busfa9al 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 the cart's final kinetic ener9fuf b( abg/s; gum/-rax3gc6gy?

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 horizontalb,x cr11f5x eily 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 stopping force acting on the arrow1 xc fxbi1er5,?

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 height8v7pygv e( k+1w btjm: di.dk. of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potentied.v+ g(t8mk db1v:wypji k.7al energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m loneb1ssa-d a;y2 g and rises 2.0 m. If the plane is frictionless, how much work was done by tay a -d;e2ssb1he 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 sp 0 azn7nf7c+sm*i4j3vlmy2jcring to stretch 2.0 cm. What is the sprin v+ 034yfczj s27jnam *min7lcg 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 by a sp8qm4 p,yltmu wev)7y;m 2hu-dring constant of 60 N/m. How much potential energy does it s ,uqmt2whvlmue4y8ymd) 7 ;-ptore, 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 uncompressed spring 7f 56bmv7w5jaujszn1 with a spr15nujfmav 5jz7sw 67b ing constant 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-;:vwcfgybi )/pi yi 5yya(p4 spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched posi ) y agy/yi:cwy-4bpi5(fpi;v tion 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. +1px9ncdg, jh6bkpm30 cm. How much work is required to compress the spring db6k+1j3,pg n9xpm chan 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 highj2 znhd454q tw slope. What is the speed of the skier on reaching the bottom of the slope? (ne4nd5jh4t2z wqglect 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 a-w7/96ahr xsnb2atl m hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving afterx ha 7bwrm-92n/a tls6 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 incli 58fy-i1jicfgmgiu q1 e5;6d )zljo ps51je)hned plane. At the bottom, it has a speed of us h5 ) 5ie clfep1-51fjigdiqy 86)gm1 oz;jj9.80 m/s. What is the vertical 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. When i+d co*c.x f8wbdq z/g(t is 0.70 m above the floor, its potential energy exactdgcxw8*ofb(. /qz+ cdly 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 N, blasts straight up8oij eh v+;kvrb(nx5+ from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise+r;(njvvxob5ihk +e 8?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic energy of 220 J. 1ry1)tukq v(n At the highest point in its tu(q1tv k)nr1 yrajectory, 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 starts fromz p)onin-4 wfu1-nk2e rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect o - n4i)nwup2n1kzef-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/oq dnw-(f)j2 ukexd 2/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 2/jd nd-qwk fexu )2o(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 ab 5r r:hg:/i (edb58ps dzxfezjt2kw+-ove the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, gsf :dk:zjep r2dtx+r -/ i5(w5ebhz8 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 atvfu:* ;tsvs i- 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 2-kg pendulum of length 50 cm is pulled 0.28 m away from the ve;7 bn2.wt3ji mb qsh3lrtical axis and released from rest. What will be iti;33bsbjn mlth7 q2 .ws speed at the bottom of its swing?

A. 0.389 m/s

B. 1.037 m/s

C. 1.556 m/s

D. 1.297 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 initia 1:9x6edwmwxnlly uncompressed horizontal spring with spring constant1dx:mxn9ew w6 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/sy*t. 6t azth neksv5r9.:s40)lj+sh cw na2bd , slows down her 2000 kg car to stop for a red light. What work is done by the friction force against the wheels?njk4*.ew5ntvsls 2 r6zsh.)b0a d: +9 hct tay

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 surfxh3xd23tvcb(jyl31 c82 gkm3 ghor; yace is 50.0 N. If the inv m dxy23 ; g8hyh33(c1jko2xlgcbrt 3itial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24,:oaisvgr)6 m J of kinetic energy. The:iso vr,6)mga friction 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-rri; wv+9-zfokg mass on a level surface. The coefficient of kinetic fzr ro+ fw9;-viriction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. If the work .q8e;hls/ qh cdhhq.e ;s lq8/cone by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined popolv2,i0 eccs gho;07,3oi vlane. 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 ma37oi,l0i vgpes oc 0 ;2ohvo,cgnitude 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 plapq/3i774w ((xiwh( sf;ruw bubyawj5ne inclined at 20e above horizontal. The coefficient of kinetic friction between t4h/uypw7 r( awfibqui;(3 b(wws7 jx5he mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, an.rzzo ,bvplsnq/,6jv/p; ek ;d strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it a z,qok;pbsp;v/r6 l v/.,jenzs 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 energyf *pm+ 4ilbv mdyx6/j) when he runs up a flight of stairs 10.0- +i ylmmfvj6/p4d*x)bm 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 uckzmgy fic,:o+(v) *dyb6g-to move an object with a constant velocity of 5.0 m/s. What power must be delivered t *you6 gcyz-+),g vf icd:mbk(o 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 ruh ..z-jgyez nnfop(11 ns for 1.0 hr? (1 hp = 746 W)p1oy-.hn.zf ngz 1e( j

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. m277pw pr1an5az7sw qr9p p w5 How much force does her foot push with when she is tr7r mawpp n apwz2 5q1s9wr5p77aveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average powmaz0jh3o)r.f3n (xwuer delivereo3. zna3 0) mhjrfx(wud by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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

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