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

1#

What is the correct unit of worku7.. u(-j szoo s+.0jzr lutgu expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if03 v,/d/gmj6city5 nqnfet2p 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 a -.6zexf4igkx* emvr:gainst a stationary brick wall, the amount of work you e*ri6e: -fvxm4k.g zx 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 there. How vncqfg: yo 7 ly+nuu;0c l;*j3fup6k-much work is being donc; j+k y;n-vuuc3 ll:n0gy*p f7o qu6fe in holding the box 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 horih c(v1m im2o/5+ed mazzontally forward at a constant velocity carrying a 10-N object, the amount of m vce12 zi/+om(m da5hwork 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 m then returned to its original 4 e e/dpuso +.pgu9jhxu.xc4v*z/hx5 position. If the total weight is 30 N, how much work was d /c*g eh+x.. jzhxu9ouu/p4vxep4 ds5one?

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 centripetal5kn lxwjx9jt1yx6./l force acting on 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. Cd*yo4u27acs q7o -st fompare the sign of the work done by gravity while coqsso4y-77* utdf 2athe ball goes up with the sign of the work done by 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 versus position (F vs. x) +yhmqq(8- n uj ws9.jygraph, represents+s n.q u (8qmjyh-j9yw

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 h0 wkxbp-6f5c(ss)y m (F vs. x), what represents the work done by thx 6swch05 () k-pbmysfe 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, then the objetl e)qav82)na ct'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 nef 5zz,r1 oc9eegative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object'sctc/mcpxm1 j :9z1ii: kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed ofg)k4d(0+c vh2y lbwgr the car. Which statement is true abog r+ 4)dh gly(vcb0wk2ut 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 halj;-6i7sl39 im ju7cyunz+ee if the mass of car K. The kinetic energy mc7uj7yen;zsu i6+-9jei 3liof car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its original speed. Wha j.3dtag32gr, auz 6avt is the ratio of the final kinetic energytdjagvuzg ,33 .a6ra2 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 pebble is m idsr;e5gh+:h;:mf rz/ gg6acoving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of tr;rg5: i/dh:geh scf;+ gazm6 he 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 spurh /*6t:vbd9aff u*veed 4.0 m/s. Both objects encou rt*v a6f9fdu:/*v hubnter 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 pa t6ul(;i+juh8*zow/l g 8oqqrnic, and skid a certain distance on a straight, level road. If you wjr*l 6t88+h gql uooqu/ i(;zhad 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 elliptical orbit. Negl0n.:d+ g4l njkondb 4lyor-r) ecting any friction effects, what happens to the planet's kinetic e0gd4n l-on oy4lb+) nd.:rjrk nergy?

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 prin4g+ lgxv)n+ 3 fgilx.wciple.

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 7wf 3vb+3ekwx hop/q5v9gqv c 01o7mpnegative 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 fryubm :8afa hy u4(kr:9om rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second obj: uba ay(kuh9:fm8y4rect 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 attacjin(*4fo+7n s5l xfylhed to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mas *jfn4is5 ofxnyl(7+ls 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 energy *)b0 pyabh a:mof 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. Cob tu:0,k3 fq bz* rr2fzvxul./mpare its kinetic energy K, to its potential energy Uut.rx kvl* rb3 z:fqz0b/fu2 ,.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a hill. a8fp9v/io yi1p9gp2 w

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 equyx1-58yuus c eu 0m8jnal speeds along a level frictionless surface. They both slide up the same frictio -ux5 cyu1nu0ey8js8m nless 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 46xbkjucp/ v6 $m_{1}$ 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 5anvn9h r(q c-for conservative forces.r5v(qa n-c9 hn

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 buildinc; 4fhi8 vfq;u6ygul5g, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before s6gqlc ; yufuhi 4;v85ftriking 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 kin4 o7e*ltzv4oqetic energy. Do not ignore air resistance. How much gravitational potential energy did theol7tq4o*4 v ze 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 distawv715o3uhh +7x8j6 yv1 jqbiql lrwu (nce and loses 30 J of gravitational potential energy. Do not ignore air resistance. How wr5xj1qyu(+v7 6uih1o7hl l b38jwqv much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of mo ,4a ;c qhmu3r5uyv2energy.

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 is.dz5l-yk fqy(ru a6n-

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 zr:;5nam sx;imw v 1l7+ 4mesr.g ti3iof power 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 uniqap2u( zk/:ad- ;w4, ieyjvdrt of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third then(l3j bbyk 3l4 time. To do so, your power output mus 34 3bjykllbn(t 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 musjiiop/ ch2z9v6 xl0z8t

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 objec r0+0hj of*zwe(fovi3t weighs 90 N, howz(vj 0re +0f wo*ho3fi much 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 of 1.0 m yxqwrgae(9th9 wj4 .9, at a constant velocjaeh 499rgy9xtw. qw (ity of 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant forcr mq/gg*cxc3. e of 5500 N for a distance of 50.0 m. What is the work done by the / crmgx.qc3*g5500 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 dixkfuyc1w98 i2ps q-j(stance of 50.0 m. What is the work done by the weight ( 9k-xuwfic1q2sj yp8of 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 1xpkox q):w pixv,;;fforce of 5500 N for a distance of 50.0 m. What is the net work i;qfoxpx) w, ;xkv:p1done 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 upvy5nrq l2)uu* 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 down a ramp, inclined jwth kil ar,cd h3/1t 665jehw69ph-vat $30^{\circ}$ 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 in7 *y):ug)as3 7cnm uea v2lnpw a sled on an icy surface (assume no frictionw) 7nl:*np7ascmg uy e)va2u3), 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 direcby 1cj1tf lw03tion of the force. The graph in Fig. 6-1 sh 0f t1wbc1l3jyows the force versus the object's 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 direction of the force. The graph in Fig. 6- vcz/rrpajmx5( qkpd8jfi6ej .*-+7g1 shows the force versus the object'sj 8m7i-jp * dv/ac qf6(gxk r+zjr.p5e position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fi;nlp ayg4 (*3q*zfakdg. 6-1 shows the force versus the object's position. Find the woa4kadnf y q;*z 3g(lp*rk done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fiav2xn )n 78xfpg. 6-1 shows the v2xn) a 8xf7npforce versus 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 moviuta- st,4o;nc21upa51kts ve a 55-kg cart (initially at rest) across a 10 m level surface. What is thea5u4tsn ks-1uv 1pa2 t,ti;oc 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 to move a 55-kg cart (initially at r+oit -( cvf-6j kkztge e(9wk*j 7b8;4wahdmfest) across a 10 m level surface. What is the final speed of the carkw+c(h 9df- e*6i(4bgtt7kj ;jk w8ozv mea -ft?

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 r7ut(d xv:i l4of 5.0 m/s. How much work is required to stop the masu(vt: rxl4 d7is?

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 dis r*ma):zha)tjt n r;z:((rja ltance is required to stop a car moving at 50 m/s under the same conditira:(l*za a rrh;j:)z)tm (njt on?

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 ixj,n ay0x/; fss cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave tx y;0/xan,jfs he 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 vertical component x*0;roxjg9xri + -,1uuyftmp of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from reso p;m,xt1-gir9y* rxfju u0x+t, 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 hhfcgk.7(g /pge6l1xwk:r ;giorizontally into a bale of hay, striking the hay with a velocity of 60g;e/7hlg g (gckr6:fpiw k1.x 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 f0j/q xz u;j)pprom a height of 7.00 m above a floor to a height of 13.0 m above the floor. p) uj0;xqp/jz 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 m long and rises 2mj 0+)u.bsrk1x *i* *u yajmcy.0 m. If the plane is frictionless, how much work+ikj** ) bxmu*cr01myuy.as j 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,n y /4losay. 4rts-)qa causes the spring to stretch 2.0 cm. What is the spring cot sqnra-yya44o /ls.)nstant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is charactel) m o(tk,gdai:gmjj; 9p/ o45styi)frized by a spring constant of 60 N/m. How much potential energy does it:mg(gft,ma4ipok /5 it9o)ld ;j s) yj 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 sprinv h, alug oa5q5f4c*+hg with a spring constant of 25 N/m b 5f ql45u c,+a*hhagovy 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 2nnh+kln6*ab9 va-krw 80 w1fy pp hl9spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Ass a fbhnw+ 01h k*lwkry986pp2 -nla9vnume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressuz qmcq* n;c /s kd()837tvskied by 3.0 cm. How much work is required to compress tkq )s8;ik sdv*z /(3tcn7m quche 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 sdqqz(io2 s1mm63)hu60.s0p abkb ex from rest from the top of a 50-m high slope. What is the speed of the slier on reachingbmpokq) m3h6. s (dx2 isseqau6b0 z01 the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial s b0yepcsojr,m*1 907(i sih*tvr(uy npeed of 4.0 m/s. Neglecting friht0 ryibe n 019cm*rusp,y( ojsv(*7iction, 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 inclined plane. At the bottom, q4/,a w*k /hypqeg0jfit has a speed of 9.80 m/s. What is the vertical qfj/4 kgw,q *0 pyha/eheight 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 t -/qr*io yhb2yo the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinyor2biy* h/q -etic 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 fromec zgryn*l 5er 5n(to u zd793 pyzx471d4mox7 ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To(ron7c y 3md5yle5po*71r x4z dx9gzne 4 zu7t 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 leave;ba kulb/tf0-a mnn 1-g+7a nes the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what-gaf amt /7na-;kbn 1ebnu+l0 vertical height, relative to its launch point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom o/ost/p(7 fn10 fophc 74z hk3ir v)uoaf a dip (See Fig. 6-2). Neglect fri4k/h v7tho)073f(z/onci 1asfu pr opction, 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 with41q veyk.y ,2hovy9p klf2 zirr;22s r a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be yp k or1.s2yl2h; 9zqifrk v, 42rve2ythe 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 poinoq pjgri-js g0-43op pl0 yi4-t 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope0ol -4y p04 -pp3g-oisjgirqj, 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 sy)yusus izyb69w4j 8uq 8i3i(wing (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 i+.x5gp l p/(4mn zaadas pulled 30 cm away from the vertical axis and released f.(zna4glpma /x5a+pd rom rest. What will be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizon8kbz il pne2 /z7ymo4;tal spring with spr p8k4 z;i2ybo/ n7ezlming 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/nh2xb8)jbs f8 s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force against the wheel8jx)b h s2bnf8s?

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 objeusyz9wq *;.e ect and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 .q ;w9suee y*zm/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 ro-cl prt18 ckj:bnjl( 1ugh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slikrcb- t8jj11:n( lclp de?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level v)yh2 a +xcl o6)xuq j/rzxo4ee/*6jusurface. The coefficient of kinetic friction between the mass and/qu 2z)hj+e/xyu rl6*6 xoov xe)4cja 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 hg8y);q8pz3jat i go5 *cvx c8the top of a 50-m high slope. If the work done by friction jot)*ccgh;3yaxpgv58z iq 88 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 m long and riseses7eu 6ea(se2 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on a2e7s(6ueees 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 .w,;h-l, dcr;s ( vfnzf2pmo: en*hlqfrom rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.er;nqfdvo;n(- ,mlc,sl2 :.pf*wh hz20. 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 dro ;2/s3 +zh og/.p,dkmdfk5h dmoyfrp+pped from a height of 10.0 m, and strikes the ground with a velocity ofdh+sdg;5fp./y kp 2 mod3fh/ +rok,z m 7.00 m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy usingf,n:dlzcto qmau *8/1 energy when he runs up a flight of stairs 10.0dnulf1o t:* zc8/maq,-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 to move an/z-u-hgprk /dtg/ o4h object with a constant velocity of 5.0 m/s. What poweh-t ou-/gh 4kg /r/dzpr must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.o ufn*. 4iewrr;ep69ot(g0o z 0 hp motor that runs for 1.0 hr? (1 hp = 746 Wno.e9er46it ow;fg0uo p zr*()

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. How much force b ym8m f)pbc6wo*i t5-does her foot push with when she is p6bim5- *8 my)tfbowc traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s i3rfr85bvtha wgh+hghpu +- 72n 7.0 s. What is the average power delivered by the engin 2+g+tav783 hr- rubwhhh5fpge? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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