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

1#

What is the correct unit of work expressenz)lg4g l)5 kv5prf 2: z-9gocv5mybgd 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 ik+6w2fya qv-nf there is 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 brg1o ynfp +-d+bick wall, the amount of work yodbyn-1 ++po fgu do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there9r(-ebxao c5s /udbl8 . How much work is being done in holding the box in this po9 8d -x al5ec/buosrb(sition?

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 consta70 js;z(fd vzkbc(o0 zp+ p7ywnt velocity carrying a 10-N object, the amount of work you dy (obpzv(js7 0zc z0;kdp+w7fo is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned9xb juh5 lq;+j to its original position. If the total weight is 30 N, how mlb h q9xjj+;u5uch 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;:64tn seohrdkc(y4 )2i3ljj-og okp an 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 bxo j()j+ bn(psfwm8/g y gravity while the ball goes up with the sign of the work done by gravif (p)+ mb/8njsjwo( xgty while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F 8my2ez7;d3bq7c x v lfvs. x) graph, represents eq;2 3bm7f d8ycxz7lv

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 represefi02oarqb e:p4k32hieckbk;4 g 7; scnts the work done by theg k3oke27p;e24: i0cs rf4kcihbbqa; force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, th(g b-ho3-f8 wrtw c3klen 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 negative, then the orjelhlkkf2g3 e3s9 8 3bject'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,,6ej:a li;sh ()a vjn kld5-ka 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 mew: pg5:xancw k()7q auch as a car, and is moving at twice the speed of the car. Which statement iaae x7p gnq(c5w: )w:ks 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 half th c-h1slwjogz-r c s7)a4 nv,0c2ht 1mbe mass of car K. The kinetic energy of car J, comparedho0, a71c 2r4cs-ntb jz-c wvms) hg1l to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its original spez b4(utk3fk+ zed. What is the ratio of the finaukzb3k4f( tz+ l kinetic 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 and a 5c-czdvl ..mvgd..6ns nte/pi1e/f 6 ke v8ndpebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's..cnne8/vd61vp 5sdvf.e.tg cm-6 nk l/zei d 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 moving8cbj;g;sjl 4 g with speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects l;gs84jc;jgb 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 panic, and skid a celf cmw.lqn1w z6d0 9w3rtain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same con 0z1mn3f.69dq w wwllcditions?

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 bwq79ej(czuk 6w0 1 bmup4isva o8 3 hw(i)c(zSun in an elliptical orbit. Neglecting any friction effects, what happens to the plan8jow6qw((i1wvhk ) 3 uaczimb 9bu7cs 0(4pezet'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 prp4pz1tp-( eq3 nz 82kzhpvsje w1q2 n*inciple.

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 a4l86lwy9 daot system 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 sz b,4 rlcn8,ifn d0mc7econd object with four times the mass of the first if released from the same height. The potential energy of the second object compared to the 7,cidl r4 fcz0,8bmnnfirst 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 causef w3 ndkx67a.nwlse81 s it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring wil.3wea8 xnn d w71lsfk6l 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 e+xcw/8 xu/*mrmr ( sognergy 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 kin t;1t1-qo:fobr ffid;g e /dq(etic energy K, to its potential ener-1;b gff1(d :doq/;rteq iftogy 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 dxh 2)kyq9zs .sriving 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 slyezccht+at1 4k; dm+ g:8 c*uaiding with equal speeds along a level fricthad;4+:azum* ck+ c8yet1c g tionless surface. They both slide up the 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 p,hfm6hl8jgl5)x bc( *g cxz0$m_{1}$ 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 e y ,s1fhm.ip8mechanical energy for conservative forcesihfmye, 1p8s ..

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, throuhc +x,iyx ef77gh the air (air friction is present), to the ground below. H7exi,hc+y fx7ow 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 -gb82je lt*+skm ut2z +jm1 eigains 30 J of kinetic energy. Do not ignore air resistancme -+28uitmjjbkg s*t12 ez+le. How 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 diypmx-n;lz80mb3a m :ostance and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energ 0p yzo:m mlmb3;8-nxay 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 con9:)doo fyn)-im( ajj eservation 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 iss3.gz2 4 aj .zzt31t*lypzzkk

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 pi7+g5 rinq/p*hr+ cf j3 hh)csower 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, whichjvar me 24;;bt,y s8s0b6ri +pbihq7b is not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you sh*emkga h4fb)88u6rp y 1( endid 3 times the work in one-third the time. To do so, your power output musb u 1ner4ha86)pmfhg8(ksy*et 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 c22 amo oj rv;qpo8a 9sd,pt2)yar at a constant acceleration, 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 thhc, wxb(zz1 d.ere. If the object weighs 90 N, how much work was done in lh,d. b(1czzxw ifting 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 m 2ylzw jw w5uv1-j2*fin the air a distance of 1.0 m, at a constant velo v*j w252w -ujl1zfwmycity 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 azc+ pnt0ky l(3 constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N f z(tln+0p3yk corce?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a dd jw17gpbu.5fiy x/1 histance of 50.0 m ipxd51bw7 f1h/jy .ug. What 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 pul rgj5cg1ub+4a led upward with a constant force of 5500 N for a distance of 50.0 m. + 1agrc5bjg4uWhat 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 up along :pq9 tsl d2;4q0q1 b qhl;yranio5*cg 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 bu2797h.hd f; .xj km 7;omqk uk3axlh,ozur18.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume no 8z;m2 .bv+p wl5gcbw 7 twk;s.gy( ihwfriction), wit.5;+.w cb s ;wimg zwbkl78(ywvthpg 2h a force of 60.0 N at 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 i2ij v8b48cwdf0 2d*-g:x3ub w sgq aefn the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work don:ecg34 u22diws8bf b qav-f xjd08 wg*e 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 direct s:o: bramj1k-ion 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 ::k j1or-msabfrom 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. Tson)*l/quhd w0 lvw:5 he 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 uwvh)wsn*5: o0ldl q/m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6-18kgvuwgk u.2e4hh7,m ;tl93pvoltd7 shows the force versus the object's position. Find the work done when the objectg 79.t7k u l hhg2km4,ul;dvvt8we3 po 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 t cx-nqjyjq; uj/o g3e8 r0:b5,)xli gzo move a 55-kg cart (initially at rest) across a 10 m level surfabnce: xjqlj;)g 8giy ,o jx03u q/5z-rce. 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 applied tc2hdtr g 8,kl8xi*z7 xvov 5m+o move a 55-kg cart (initially at rest) across a 10 m lxiotg+8rzd lmk5 ,7vc *vhx82evel 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 spe / p+d/zotedpclz9x8)ed of 5.0 m/s. How much work is required to stop the mass?+9c/d xlop8 t/dzzp )e

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 movif(+wj+dptvvy ,g+q9 gng at 25 m/s, what distance is required to stop a car moving at 50 myg(+jvv,+dfpgwt+9q /s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerti 88riuc(rg6*bnb0 5 zcj1mmj3 az+cqj ng a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming thb uc* 0b1 (j5m83nc+r86iacqjjgmzrz e spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical component kvp,6 9jza9+ rmg y6njof 60 N. The force is applied to a box which rests on a level frictionless floor.ay9jvzp6 k+,9m r6ngj The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontalle:;yg0z -jt axsmy eu3r 6f*.fy into a bale of hay, striking the hay with a velocity o.fe*sxa3 60y-:yf u;z jrmgt ef 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 m9,2p*wfvd+c:l z0 bqzczye8 g:iim3 from a height of 7.00 m above a floor to a height of 13.0 m above tz2dqmy:w ibv+ cfl ,ezp3* 9zic8:mg0he floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 mliut*rquwfw w53.8f * long and rises 2.0 m. If the plane is frictionless, how f3rwwu f.5ul*8 wti*qmuch 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, cause y zt1fju.24phx4 oj8fs the spring to stretch 2.0 cm. What is the spring 42z.yh8 1jfoxjptf 4u 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 characterizei g7r3pf, tbykb4e 1:gd by a spring constant of 60 N/m. How much potential energy does 4gb3ef t k,1gir by7p:it store, 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 springc 03ul:fo +-h kbowei3ot)-ex,hm:jf with a spring constant of 25 N/m byx:mu-l e,h3b: 3cote+0ho )-ofj kwif 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 4ffvrlc00z0 g )0 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position iff v 0)0rzclg0s 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 8, uvqnbh cgindj482 +initially compressed by 3.0 cm. How much work is required to compress the spring an additioncb givnqdj+hnu 28 84,al 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 pq3 w;mb, h(r+ jdv.mnfrom rest from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect frictiowjdr( bn.+mqm3,;vphn.)

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 s;2)lqt ,rxm1gv,(vh og kts9rpeed of 4.0 m/s. Neglecting frictktm ,qlsr1), 9;go2r hx (gvvtion, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless incwjocj 5py()0 75s/olj9 4o bfcx0mehklined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical heightwjkh7oom cybp f4s5o 0e5( 9/cx)j0jl 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 flbmi+yj/ t4x( koor. When it is 0.70 m above the floor, its potential energy exactly eqkbxmt(4+yij / uals 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 up from ground leveu21xhz.s5 lvcq6 yz ifq0rx vt k9,.*ml with a kinetic energy of 40 J. At the exac 21hx9s*r5 ,qvqf0myuctv6k x.zz i. lt 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 the ground with a kvqu x:j9+a 544 ayuwdginetic energy of 220 J. At the highest point in its tra+g4v45aau:ud wxj q9 yjectory, 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 from rest at a point 45 m above the bottom g46kbgb- kvp /of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at th4k /p gb6v-bkge 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* rvvscvq 1: jx2;)l;3 fyh9ufousx.n.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2).r1)f;u :s juvv;2xs3hlvq*y . cfox9 n 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. 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 d :7 h+,adhslwdip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the spel, 7sda :hh+wded of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its swii; w*dnn3iuqr105nlv ng (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 :9wt3 n3gbg ttaway from the vertical axis and released from rest. What will be its speed at the bottom of its swin:39n3bwtg tt gg?

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 a)rvsh0.oo6ji a.u)f dt 25 m/s hits an initially uncompressed horizontal spring w.hou a.v)ois06fj )drith 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 hyll;4le7 zdr62ckxc 0bnq;mm+ l )3 twer 2000 kg car to stop for a red light. What work is done by the friction force against the whe6 wc c)ll+;;2lt43b7xlk qnmze d0mryels?

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 60.71h+ 9wta zhv ba2b0voz bi.a-0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance wiha90hwtvvbaoib +z712a zb - .ll 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 J of kinet1 ll:sf+8yzxjll2-ome7a b5bic energy. The friction force on it is a constant 0.50 N.:zl5j+2bmle1fa s8b- ly o x7l 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 horizon3c1e:r) tfcrmeaha(z - ti-.ntally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what rc n-tezm:31)a.(e c hir-fatis 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 frp0r)j1 fik2v s1 lj6 57uqo;tkyuyid5 om rest from the top of a 50-m high slope. If the work done by frifd6qui ykrs15 1 pil7 yot ;)kj2uj50vction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 )e(rlo :oy 8bvd8ow6r )z (afn-w0ggsm long and rises 2.0 m. rg(rw8z ao y)0odsel)8(f :wg-6nb vo It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest atc)ac;0 0 eulzw the top of a plane inclined at 20e above horizontal. c)ul0a;0ez wc The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes tp: p29; oroqcmhe ground with a velocity of 7.00 m/s. What average for :p o9;pcqom2rce of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight of s9y e :xo w0nyd8qr)j7og67akbtairs 10.wb y en go8q:9r7xj7y6k)o0 ad0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed t/i15lti biunu;gy 24do move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object ui4tni5d2l/ u1igy b ;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 hr? (1 hx(e lr78 /dugdp = /le(gx7dru8 d 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 500 W while riding. t/ccw h(a1rc cn4 vl5;How much force does her foot push with when she is /5hav1c4cc (w;nr lc ttraveling 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 thwhfcfg3kr 8( o3 :8rcido4o9oe average power delivered by the engine? (1 hp = 74go9frk hc 38(iw48 ocor3fd o:6 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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