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

1#

What is the correct uyq++4oump d. bnit of work 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 if theb(hpk+f;dw8 udf(;e z re 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 brick wall, the amounle chj:0n(z+r6(qmpcp 0nk xb1 s/+iot of work yoj(hqcz ppk0n0+( +osb:l61m/ ncix reu 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 much worm qnoj 8nhj-,5quo ehk/3fp-7k is beinuj7m-e /kphoj8n h, o q3q5f-ng done 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 horizontally forward at a constant velocity c bygyuyu zg4u.l;gso a);e-:qv-8n,uarrying a 10-N object, the asaguv- ulg4oe,gzyq8 .y); u ynbu:;-mount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to its orv-kj2xr e lq;9:c w2a te-nlx3iginal position. If the total wjeqc-l e ktx 2l;2v-:3xwna9reight 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 wor8 sja ;fry)(w*gimcb+k on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by gr83uos izfi )md.kc-)u avity while the ball goes up with the sign of the work dok. -)f8dmzs3oiiuu c) ne 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 versub86tw1ycxsu 2gz;b+y s position (F vs. x) graph, represents2wct gb;y bsx18y6+ uz

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 reprwl ub9 mn.5 zs )v ;2cdzoim/o327jffresents the work done by the fov.jf czno;7 )ib 2rlosdmmufw952/ 3z rce 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 *tppn zsyo //3object 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 the objecs6n 4mgxnozegu68 f8btm4)6 w t'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 o q 1elklpe w(p*4b;m3vbject 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 aw ve +aa+oiv)-i cwhsil4 04k3+iqh-k car, and is moving at twice the speed of the car. Which statement )isva o+h+iwc40k- qvkwlai -3+4ieh is 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 awp mv2x ba7ng,js2hib4;t: 5j s car K, and car J has half the mass of car K. The kinetic energy ofg ;j54bt2s7ba vxjp ,ni2:whm 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. What 3l,x.u1h ; iv ixvgdt;is the ratio of the final kinetic enerx;;vix ,d l 3tvi.g1uhgy 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/8b1ab6gi9( sl2cmrw0tiv) ux s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the briv96 br ub i lgti8(wca20)s1mxck'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 ma:7 tsrsi;ov+:mlp p1 fss is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distlom p;p1fvt :7s r+s:iance 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 cam(inmae;i*tmf z* n ;8r in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under thm(emz*ta n; ;iifn* m8e 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 :irx :a09 pnd mft 8wrgwf2*k1orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happen *rk fmf1i p9:g:dt8nw ar0w2xs to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

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

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy y*/1j g99n,h:grkghtg2ku p xprinciple.

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 tt--ton- fpz bwvxvl8/j4q,gijv3 (: vo 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 ser6qf mezt)4 xy5x/ 0emcond object with four times the mass of the first if released from the same height. The potential energy of the sec40f5 mxzytexqrm ) e6/ond 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 te-a84ej9lkz gyzai7;j0mm4 ri t7ap 3o the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potrm aij47z 98 im;70eapz4altgeky3-jential 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 of a system.4t0bdg umaqp,ki+ v/ma, z +s

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to its gjn/nb r438io potential energy U.irjnnb o8/g34

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 drivrj f kj;nhiu-ot; 8n86 k(zx(4dbsgi (ing 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 obje3 btq:fu9 q +/kxda-3s kq2yspct are sliding with equal speeds along a level frictionless surface. They both slide up the same friction-/yb3 ukdt3+:q pfs2q9k sx qaless 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 ict*5:f 4usob$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for coltvfsr s/dyf6 mv6b35l n+35mnservative forces3 5/vnfv lm5 smstbrf36ydl+6 .

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, f j z+.0b-ne*33rkgdv j t4zvlthrough the air (air friction is present), to the gv3nr*+e.4 v kbtljfjd0zg3z -round below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. 6 q-sjc ho sq1g,o7c;xu*wsz) Do not ignore air resistance. How much gravishgj s co6x-o;)7 q1us*,wqcz tational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational p v gys02.dcqukcd(ialt+d*;3otential energy. Do not ignore air resistance. How much kl(ckvi; a2q dg +cusdyd3t *.0inetic 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 e-r;cypxw6x p 3nergy.

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 is9/ xa j6ws1 nzkcv qdc)30x6sl

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI units+x*6 xtr:xv xu?

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 poq0qmxh i43j (dwer?

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 thee7wa d;tet 7x: work in one-third the time. To do so, your power outpw; atxe:e77t dut 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 ac4adg w j--e+jiceleration, 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 ,sov 3 ho53m2qike(flheld there. If the object weighs 90 N, how much work was done in lifting v o(qhi3kl5ms e 32f,oit?

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 zh1nsu v:*te- the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What iss z u-*t:e1hvn 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 constanty -gwii7ixt 4c5c bhna*3;+ub force of 5500 N for a distance of 50.0a*xc-bugi t+ w7 b;34yhic 5ni m. What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a c-i ul+,1f0 a4 eioktgzonstant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of-z eki ag10iou4tl f+, 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 pug i 2+2cu(aaql.gp+svlled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net wor uqgvl a +.scp+2(iag2k 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 alonghri s,;t6 ejpfva :/l, 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 p- s)mepwev.8mi fy -;v7f6ruramp, 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 icx :nw riv(ex o5mkmu4:y;og(* y surface (assume no friction), with a force of 60.0 N*w4e xo:xg yo mr(kuim;5:vn( 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 oftqb/ wyn3/: mf the force. The graph in Fig. 6-1 shows the force versus theyqfw3t/bn :m/ 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 objeh;1,pur0-c gbku 9me vd vppr2hi559e ct in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when thu 1ruvp9,;i 9-0gdpc55 bm hk eehr2vpe 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 ;7/+mne vehxp 7d+y2kpoj, b aof the force. The graph in Fig. 6-1 shows ,y/joh dpa2x7m b7 pve+;n ek+the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force.rt :h oy rcz4a9*g3y:t The graph in Fig. 6-1 shows the force versus the object's position. Find the t othc:yarz :y* r39g4work 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 move a 55-k0qx- -q56tm mi b)fpmjg cart (initially at rest) across a 10 m lev65 -q mt-0fjmqb)xi pmel 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 to move a 55-kg cart;zgw; .iz)3fxlcxti1 (initially at rest) across a 10 m level)xt1 xc ;ziw;3gfzl .i surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed ofq93 pcmno wyf(;,1ybf 5.0 m/s. How much work is required to stop q9;ym(c1wnf,ypbo3f 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, whatepk i c2oyj8;k go.oz2i9 u26am (7wsk distance is required to stop a car moving at 50 m/s under the same condsa wg.2upyeioockz ;o72862ik m9j(k ition?

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 pw; yf: lbei7,tropels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave thfei;y tw,: b7le 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+4w:u tcz jmf6 and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cu:j4+m wtf6zc art 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 horizontally igzx9kv71e 3s onto a bale of hay, striking the hay with a velocity of 60 m/s. It penetrk3o sgv1z ex97ates 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 of / l,cg1us v8eu,jh1tjohw .o;7.00 m above a floor to a height of 13.0 m atu vo,jh8 ;ojsgl1/1c h., wuebove 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 plane is 4.q9yu6,kz*p 2 :frlpnc0 m long and rises 2.0 m. If the plane is frict9 k *pl6cqzfu p:rn2y,ionless, 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 2.0 cm.8 h0mevyea b(: What is the sehm b a:e(y8v0pring 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 characte8, hlrdc-e:thi,2f8x zpk ;uorized by a spring constant of 60 N/m. How much potential energy does it store, when stretched by h;288:i-k xpoltdefrc , uh z,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 initiallyh-:ofkqe. qc8 uncompressed spring with a .kec8qq-f o:hspring constant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of sprkx b/*,/kz 2krn uhc/hing constant 40 N/m from x = 0.20 m to 0.25 m? (hrn k*c,/2/bzh xu/kk Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compress5pbv9 f(. cg* zqdo.woed by 3.0 cm. How much work is required to compress the spring an additional 4.v g*z(od qbpof.w95c.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high /a2v y*bh4o vgslope. What is the speed of the skier on reaching the bottom of the slope? (neglect fvg2v* oa byh/4riction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top lw vyqvm2v*2 b/cs)ps7jmj0*of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be jsvc/7w* 2q*)20mpjvvby sm lmoving 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 bottf.j,kscj 18 aor k. pt.v9wa/nw)uoj0om, it has a speed of 9.80 m/s. What is 9p.jwfan )k. k/uvac. ,r 0j 1jwto8sothe vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floors+e+wzsci r9), its potential energy exactly equals iez+srsc)+w 9its 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, bd.:oq3c 0wybk lasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectoo c.dw0by: 3qkry, 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 le*tjz it :flz;um,+ za6aves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, iz;t:t +6imz al*, jzfuts 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 startsyljy8w5vpokye178 i ac2 r )de,0k7ah from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom pr8jvyoke0ykihl7wy c),e 82 7da a15of the dip?

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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 w r(nw2b -.i *-ahzyyqqith 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 the speed of the roller coaster at the top of the next slope, w2 qhyr-(*n- yai bq.zwhich 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 pd6e( inv xhm; br*6:gabove the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect fric*rxnge( 6d p:ibhmv6;tion, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball aw 8u9qdxrs cq359 ay(dt the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.28 m away ff(5v xzzmh+jq c:1c9 v;r*u qarom the vertical axis and r x9q:rqz hvcm 1;cf(u+j5 zav*eleased from rest. What will be its speed at the bottom of its swing?

A. 0.389 m/s

B. 1.037 m/s

C. 1.556 m/s

D. 1.297 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed h/6fcl-2ch9l b5igri corizontal spring with spring cons5b2ilcg 6-h9 frcil /ctant 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, slowu52h/etdmg dp-;i ch+s down her 2000 kg car to stop for a red light. What work is dpehi5h -utc;+2g/ddmone by 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 z jwei8;+z/un 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object;w +zejnz/u8 i is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 J r7l3+,-eg rgt ztspo 8)8goosof kinetic energy. Tgr38 r-7+t8o,eog gsz tls)po he friction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a ez )6b (hgtjs3level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved )jb6h sgt(3e za distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the txwcm nz8x5x+ ,f+,napwj d96e op of a 50-m high slope. If the work done 6xxnx,8p5a 9nmje+fc+ w dzw,by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and riseoe+(3)k.z- 9cxzhpaaqs y dv)s 2.0 m. It requires 3200 J of work to get 3e)v y)(kps9oa a+c- h.xqzdz 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 atn1 m 4hzen1nw3 20e above horizontal. The coefficient of kinetic frictio4wh nne11mn z3n 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 herx) xy 0t-r,ozldv42k ight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frictio yt r)4zk2x0rld,v-xon 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 staic8z42ijhhjbr 1 q9fc k*-0 c8e 5pjoiwrs 10.0bfqpc ej jzh2k 9r-hj4w5c0 oc881i i*-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 object with a constant velocity owg4 df w,x.qnbn4n4,g f 5.0 m/s. What power must be delivered to the object by the4 n4qxfw ,.gnb4nd ,wg 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 h-zdp11mu2kx8gj;k ysdt1d / for 1.0 hr? (1 hp1j/hmpk-xg 8;t1ddy uksdz21 = 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. How muy*i+:sc-vm) jnyj c )/fd(carch force does her foot push with when she is traveling at 8.0 drfj c)jsi:-mc /y()n av c*y+m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average powcoqb9 t e;k)x8y6 n8qaer deliv8;a kq)b8qn69otxeyc ered by the engine? (1 hp = 746 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