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

1#

What is the correct unit of work expressed in SI un60: -)vih ,lqkjv w)fry3biqdits?

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 ahx/u 9y e.,vfm system if 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 skdtg65 h nt o,:c h.x 5zg/9bi)is.lmotationary brick wall, the amount of work yo i :clsxi oog6bhz 9 mh,k/5)td5ngt..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 lifted 2.0 m vert0;d;beaqrtw x (jz6cnh: /;htically and is being held there. How much work is being done in holding the box in thish(xt;cwq :; /za6;debn 0jhrt position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carrying pcymd 3/2bdmbtp1+ ,ga 10-N object, the amount of work yot 1,dy3gpbb /mp+m 2dcu 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 m then returned to itr/h .ss5s*gxfgd 5 d-arfrzvk6 :)p7ys original position. If the total weighsp 65rz7d5.fdvfa: k *sgrxr -s/)yhgt 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 t-mkau2o2g;wp 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 gr9 )jx)- xfp:jq mce9fsavity while the ball goes up with the sign of the work done b )e cxf:-jqmxp)j 9sf9y gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force vt)kt// lppkce (loe *5ersus position (F vs. x) graph, represents*5ktlp cote/()le pk/

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 versfc/3 o5xwman6q3 yi6 qus position (F vs. x), what represents the work done by the forcei3/wco nfmq6x aq56 y3 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 objebfuu/r xq 3 ahfb/-zuqx,a.2(ct is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then thec:kq9g*tgy v5 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 objec bqqjrs 8k.nys:hv-89t 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 f+,hnh m4 8umc.b+bfg car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to c ff+bbh+4u 8,m .gmhnthat 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 twdp re8)d3h-op; z0rphe mass of car K. The kinetic energy of car J8wpded zph30;rp- )ro, 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 its original speed h/:vih. 7x8zht4zbx p. What is the ratio ofhz i7h x.xvbtpz4h 8:/ the final 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 ofq8 e 6 3o5lf4ouilfnnin4 e/z1 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have ln36 l5i/ 1zeq f8enfn4i 4oouthe same 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 2.0 m/s. A 1.0-k)o-6 wq e2ak4tisj v; xz,5lxeg mass is moving with speed 4.0 m/s. Both objects encounter the same const s;4l ,q)tx kzoeajwx562vei-ant 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 brak.1gww8c k.+4e zom-x qzvvk 6,okth8 zes of your car in a panic, and skid a certain distance on a straight, level road. If you had beenm4te8 1 z+z cv6o.kzhkqxkgvo w8.,- w 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 Sulvino *ydo1*s7co 5fi: htr7 :n in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic enidofl 77hst *:5ro*cvon1 y:iergy?

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 principlt )h++5a4i msgc bcd)be.

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 negativ3nztvu qx6 +2fe 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 hphv4e*t6 60v igne 9pk4;i(ihnxy8wc above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the8i60gh xwn;i ( 9e kv6iv4tpp*ch4y ne 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 sprin ebg i(1js3rf2g causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the sp3(eis j 2fgr1bring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of7ukr2m(g)s uisfe1c 0 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,26-.bli 0tkxy+ bahdg to its potential energbl xh2b .dtia -g06k+yy 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 ca(v wktn0vmuec74h 7g um(6j4mr 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 wp*1 cin/tvq /sz(q6 /jixu (4hrqb5lspeeds along a level frictionless surface. They both slide up tqqlh1/( zcj5i vn( u/qt6 /rp b4iws*xhe 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 9 kr5 c,uw)1m-gyhzasp , g,rr$m_{1}$ 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 energyq/4 pmrr 9o/9l/xbv dj for conservative forces.99drrl/p4vm / xq/bj o

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air friction is pres u;vek32o vve,/ ,nv9wvu;tw kent), to the ground below. How does the kinetic energy (K) just beforkwkevv v, 9tu neu3,/;2vv;o we 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 euj x es6 gxfcmc;ih3fi6/0.l) nergy. Do not ignore air resistance. Ho ilu; seci3g.)m66xh x0j/cffw 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 loses52 0qoo1w5y d.jqokx u ;4kqkh 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy dwukq5qy042jq;5h d.kok oxo1 id the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of con)oqo04n;g f;7vb+ sijic o3 wcservation 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 isaq 4ptjis : 9k1elt-m-

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 poweru r3(ttgz) x2rfa4 m)(eu;zc m 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 of ponzk vu01f( 2ajma/ uu/wer?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work inka1v 2zqtiwoq5(+ n2 j one-third the time. To do so, your pojzkv( o iwa215 nq+tq2wer 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 acceleration, the car's engine muspz y0*6ch 5d w8h2crhct

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 he reo3e 9esyf t+7erewy(yz*(, ld there. If the object weighs 90 N, how muc(+sr9*fet e(zyey ,ro3y7 we eh work was 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 y*/ 374qhvsqdeah(tw irw+,t of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done(4q *+ hsh/ww,eyqdrti7av3t 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 9yi v-yxi-t5n2fw- +ij lgm::br n ;ybconstant force of 5500 N for a distance of 50.0 m. What is the work done by til9g--5+-vi nfwn:bm:i;yyr tj b2yx he 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a i 2ns/utm3) h4nfiym9distance of 50.0 m. What is the wor/94s)im 3in htny f2umk done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a lqwgb1z3 *6(ztxd dy-distance of 50.0 m. What is the net work done onb d -3yl1zxwqzd t6g(* 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 alol mtb8f)g6-ge ng a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a tn7 uuromf676 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 otii/ eodtj,77 n an icy surface (assume no fricodj/ ei,7ti 7ttion), with 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 in the direction of the forc6o8mog61* 9 gyrtv l3.qpwfphy (.efqe. The graph in Fig. 6-1 shows the force versus the object'ovyp( w qg l.g m1.ot 9e3rqphf*66fy8s position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the directioi z-fs; a.3ipydee 2,an of the force. The graph in Fig. 6-1 shows the force versus the object's poe-syiz f;.aid, 3e2pa sition. 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 aqbwy:t9ti/y -j4l2f. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movq4ytlt 2b/ji:9a -ywfes from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The0 dl5w9mbaws8w: xh5y graph in Fig. 6-1 shows the force ve9058lb 5y dwxwh a:wmsrsus the object's position. Find the work done when the 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 movkq5 ez+n nyfbej:g+.(e a 55-kg cart (initially at rest) across( enqyg.+bzf+:nke j5 a 10 m level surface. 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 fmvx1z2 hpx z07)k lkr,isa-3to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of th , 1 plakz)f 23vxk7s-mrih0xze cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. Ho :nsy9q x+c(giw much work is required to stogs( qn ycix9+:p the mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distance is rebmnatcfa h9b h3w4 4u:) 7fm:pquired34:babp 7n 9c mwhtahf)4umf: to stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exertingggb0e,*4cvpy mn(kw - a force of 20 N over a distance of 5.0 cm. With what mkb(eggn4y- v,* 0wcp 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 of5 kq1dba-jc6e 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energa b6e1jq5- ckdy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally int6i+vlt u f77y:a/ o xm) of1wn*k+sbvao a bale of hay, striking the hay with a velocity of 60 m/s.kafynw o7t 7v*x+:filbs )uv +1mo/a6 It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height oy-kuflnpgkg+6)b/7 8l rc :cpl5 q7 jdf 7.00 m above a floor to a height of 13.0 m abou gp 65l7fcq prbdl 7-l:8 n)ykjg/kc+ve the 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 plad/wq w25.acv.jk3 whyne is 4.0 m long and rises 2.0 m. If the plane is frh w3. q2ykw./jc vwd5aictionless, 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 stretch 2.0xnrg5z ((lkc6z 1 5/d olvf:eh5ue)at cm. What is the spf(:dz 5 lx/)er1ua(6kel tn5 5hgcz ovring 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 baro4 xyu f6g;jbj405 a spring constant of 60 N/m. How much potential energy4y u5ra f;0xgjboj64b does 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 compi/hxg2 *+bd vbzk1m 5eress an initially uncompressed spring with a spring conib/eb+v1* zdx h2 m5kgstant 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 qlgo n6p7iyl3;khi /-of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is a-k6i nl i7h ;ogpl3/yqt 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 initi): a; wxi id/o0+wvfpially compressed by 3.0 cm. How much work is required to compress thevf+ /w o0pwi; )x:adii 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:8 hfg1i8 68v uftqcjo from 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 friction. f88t8uq:v ohjgi6f1c)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial speed of 46k-7p hjlhas2pse 2of ,o6i i-,pwow2.0 m/s. Neglecting frswokp ihf oh6a7,sj-,2wipl22p e-6o iction, 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 frictionle52-, cvftzax6au c3ncss inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical heighc3 zt,aaxc6u fvc5n-2 t 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 it is 0.70 m above the floor, its potedam )xz e/:l,g2fen hq 2;j;z :op5agxntial engz;:ne q 2apx zlgaxd 2eo),5;f /jhm:ergy 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 N, blasts straight up from ground level wii/i foyq-li62 1r7wff t31zgrth a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what v2iqr ogfr6l1-y f 1w3fitiz/7ertical 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 kin i *300d31uxhzmowyhjqtj8u3 etic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertity83j jqm*hz3 iuh3owx0 0u 1dcal 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 an/fncl7w /otzjw * .6ebove the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller nwc6o7/* e lwtn j.fz/coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m abov.u(kp;:fnspi g *yz r;e the bottom of a dip (See Fig. 6-2). Neglect friction, what zp * :grsfup (y;;ki.nwill 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 iie,9a 5er)tj 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 coaster at the top of the next slope, wej9atieir ,) 5hich 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 ballkr8 w1ld8 u;ib at 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 away from tt j n.u4.qamu )1ls4cuhe vertical axis and released from reuj ua44t1lm.ncq. u)sst. 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 him ihsefs 5ihm( 98;d4ets an initially uncompressed horizontal spring with spring consie d4 ;i9fs8(5msmhhetant 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 ca0v03zb gji:par to stop for a red light. What work is done bgb:ai vp00 3zjy the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontalnxwe ;zxj;n62* 4cdtm surface is 50.0 N. If the initiatzj w2dn;*ce ; x6mx4nl 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 h*yugus.s qmd4c 0 -/vlas 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far yml 0*q -v/ dgs4.usucwill 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 horiz3h l8.xz) z)m.jf:wbcbqw wl/ ontally to a 2.0-kg mass on a level surface. The coefficw/8b c).hmll)3zw.zfbjw q:x ient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its 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 startss1ifw )1hq/e+o lqf.v from rest from the top of a 50-m high slope. If the work done by friction is 1/. hq +ew)ifso l1vqf$-6.0 \times 10^{3} \; J$, 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 pl7 ngs4p.ed/ krane is 4.0 m long and rises 2.0 m. It requires 32004 sn7dgr/ .pke J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined atag+:*e jin;tfh5qpv i ;4 dtt- 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the ma *t n5 p+;avt;gq :4fhe-tjdiiss 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 fnwhmj)60 8u xthe ground with a velocity of 7.00 m/s. What average force o 08mf)xhu jn6wf 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 o acz b(nv,)(. nju-dy 20ttjjuf stairs 10.0-m higb( 0.ctnzjjuv2ut dy),-jn (ah, 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 object3m ,vc7: gmr x9kam 1n (f14aaxuhiwy1 with a constant velocity of 5.0 m/s. What powe(yv: 9hir fm mgxx1w4,1amuan3k1ac7 r 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 energyfoms13 z dze.drh 3dp/) v1c)z are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 74/o1hmd) 1 zcr 3.3z sdde)pvfz6 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+s6bu://xrjf hj po2zy ;tm5i of 500 W while riding. How much force does her foot push with when she is traveling at 8.i t/ h2jx/y: bj s6fm5ur;o+zp0 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+, s t0;k .4vmubjyyug1e8ihq in 7.0 s. What is the average power delivered b t0uu1bvey.y4s8 ,;ji+qkmhgy the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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