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

1#

What is the correct unit of work expressed in SI unitsd-5l+ y6 a1hcmbie,cx?

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 00zif c0qzi*bc lx5-xsystem 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 harywuciipq6b1k ke6/wy;:xcb.h*7 oc( d against a stationary brick wall, the amount of work you do*x7i b:c( h y; eu i/pbkkc.qywwc616o

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 vertivo+x / mtz 9-.9gsthodcally and is being held there. How much work is being done in holds o tm9- /hzxg.+9vdoting 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 *x 5l1cw) mnk5yuf 3u5vywk u6at a constant velocity carrying a 10-N object53mw65wfu kcku 5ylx1 ) *uynv, the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to itwkh)e x,a;2wd5 , e; q1uskunps original position. If the total weight is 30 N, how much work ;;s )nua,15kww x ,upekhqed 2was 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 for4h)2dyq +s1xqx jxm* qce 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. Compare the sign of the work dc;lkh.5op hdn*a4m 3o -cns3bone by gravity while the ball goes up with the sign of the work done by gravi3p-ohl*o b anm3h5d 4s.n;k ccty 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 cp qi -p.gpwt5rbl53c /urve, on a Force versus position (F vs. x) graph, representsp 53-tr .bpq pliwc/5g

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 6x4t8ou f( skj vmm/1vu20 mdkrepresents the work done by thm smkku /dv6 f0xtv21o84m( uje 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 objec hmf:ru/(*le9jl ;idjt 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 objen;0. 4o n dfy3cqpe641 gqxzcsct'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 onvs-ufv:9p; z5 t2l0* hz1lisk w iukj/ an object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the spb rbi *u-ex8p/ulz2w)df ;dx-eed of the car. Which statement is true about the truce;-8ld 2xw*izfu/rb)d x- bupk'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 asqc0r3t h+/ayv fast as car K, and car J has half the mass of car K. The kinetic energy oa0rq+3 tvyc /hf 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 bouncegr sx -zb-4igxe5n-l,y hc o68s back with half of its original speed. What is the ratio of the final kinetic 4e-g,l n i6 bzgr8oc-y-xx5hsenergy 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 moving 4r.svdopiz n(fk5he.; li 5(qf bb2* nat a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick' o4. nsq52(kile pi.v5bbd*r(fh;fz ns 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 wgjv x,p2znxmfy 3y 8f92my:6yith speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/sy:2gfy 2 ,z 893jmyvfyx 6xmpn. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certafzpc1 v;1bg -(p;cdq ein distance on a straight, level road. If you had been traveling twice as fast, what distancecg(fpqve;d1cp-; b z1 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 ellvm5fzao2;(xb v 1r.ch iptical orbit. Neglecting any friction effects, what happens to the planet's;hv1o 2(5zb xm.rvafc 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 prmbryee tj1ib21 5 7s:yinciple.

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 sysep,rp irj6c)qw-ky( l7zg 8 o)tem to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h / oeuq w0kd-r;5;ndg aabove the ground. A second object with four times the mass of the first if released from the same height. The potential e qe/ku5dwdga0o; ; r-nnergy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring 9*ear xjm71ta causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the txr7*9 1maea jspring 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 sy*r xvco,y fdz5kuc (:5stem

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. zb mgd/3yp awk/*3*lvi.hfi2Compare its kinetic energy K, to its potential energy 3hwldb/i /akp2*gm.yfz i3* vU.

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 upvwb,abm5av -- 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 g 7nkkhm x /vti5r8))l2jyb11vhx yz- very heavy object are sliding with equal speeds along a level frictionless surface1il)/k kj)8t n2gybv mrx1vh-zhy7x5 . They both slide up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses ;rdhah;i :r:qur6r (a$m_{1}$ 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 conservativeda0rh m,m: bz5244ek3vqlka s forcesmmqdab45ve2ksakl : 4h 0 ,r3z.

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 tzcnk,5u, cwz 3n)wnbg hm*um* u19j4rop of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential eck5m n*jmch *bzuu,n1ngwz),9urw4 3nergy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do s6uvm 4 dbki85w//sucnot ignore air resistance. How much gravitational potential energy i/6vmbu4 s/ku58sdcw 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 potu/xs en2uid-qj t:w2 +ential energy. Do not ignore air resistance. How much kineej+ -iu:d x/2wt2uqs ntic 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 energtu01q-s(gdh usn(c wwk kgc4 5lot*w.ee -71uy.

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 iswc *nv(z s1c,x

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 )b7r0pjddzg4 iaj;q pd p25k: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 powersm,6 iss ,l tk:8y.xfh?

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 the time. Toc;j x:u2roej 1 do so, your power output mustc2:j oe1ur j;x 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 accel4fsxxk(6hg sbmspx 3oq);s4 5 eration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. I tp-fu.sq9/lo p+ 9yixf the object weighs 90 N, how much work was done in lxy+t u.9qs/ pof9lip-ifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a dtpd*f.y7( kx/p l.xwv istance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of th( p d7xkvy. *fxw/tl.pe 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 constdm eu,-2 y1y7c)zrb 4tgxfb+oant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N ff)- 2e4obx,+td7m grcz buyy1orce?

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 +kiwxg8x*l e1/2izy a with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the wei *le / yx8gki1xi2+azwght 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 constanzs*yn+qd bl0( t force of 5500 N for a distance of 50.0 m. What is the net work d*dqn0+ sb y(zlone 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 6ik; p4nf )ow x855pveu)dgh0r.0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit sr)5e,+ oyvge2t vcw sj7mg7q9lides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assu76 teig)w zhz*me no friction), with a force of 60.0 N at7) weizh6zgt * 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 directidz4 5u9as--ks;5pspx gnipu :on of the force. The graph in Fig. 6-1 shows the force versus the object's position. 955updga: zssxs p ;u-4nik-pFind 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 gra ccof -r-q9wb/wbndn+5zvg). ph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to -crwz9fb5d/qovbwg.-+ ) ncn 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 direccik)dz-ruk by/*jyb-)n/ u; ction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the /c ;ybcuzr*/jb)nkd )ik-u -ywork 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. T+6 uo y7gvg r0k00/bvk jkkpu/he graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object+ r0v vgoy kpk 6//uk0b7ugjk0 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-kg cartg ge7y7)v 6 bkxn wq )+c9g2,rfvps4ok (initially at rest) across a 10 m level surbnkov2p fq+k)wg veyx746 s)g, rg79cface. 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 (initially a a7ilp 3* gn.t l2:m d(lbh/9zkjime9pt rest) across a 10 m level surface. What is the final speed of dnba2lm(j:3 p9g ktphz9/ii 7eml* .lthe 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. How much w 80i(utbzsym *ork is required to stop the mass*s0 ty (m8buiz?

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 requ98 a7muv(cbm nired to stop a car moving at 50 bu(9 a78mvcnm 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 cockq2le 9yy3esb3 ed by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming b3 2syyl3e q9ethe 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 co3e 0weo 6ow0y/i mh*ui vdii::mponent 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 horizoi0iw/: e6u 0i3d *hemwoo yv:intally 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 shotr.v7s+rss +u 2vkg:dt horizontally into a bale of hay, striking the hay with a ve.2k s7g drurtv +:v+sslocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved f(am1z5l(kz-q wp fydk8 u4g.hrom a height of 7.00 m above a floor to a height of 13.0 m above the floor. Whqk(lagz.zwkd8p- (u 4fm 1y 5hat 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 4q9mh66q7f pxb7e0qb )k drsg1* b1q lu.0 m long and rises 2.0 m. If the plane is frictionless, how much woq9d6kb0xm qq buh sg 1fleb176p7r* q)rk 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 l15yg5lltw+pa1ey 3 er( ;cyo, c+upy. What is the spring cons5a+ y(5tcyw +p3oc pl,1yl1eeg;l ryutant?

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

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

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. How much po8x ,shzir 06fd*qcbm 0tential energy does it store, when stretched by 1.0 cmri6,d* xmzsc 0bq08hf?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed spring wn;)r+ 5d h8fe*atlt qoith a spring constant of d8 floe*tnt q r)a5h;+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 strm r f ;mwk(+oeai;hy i5kz7d.6etch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched positz ymkrmi h(7;+i6.fek;5wa o dion 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 sprinwg ;km9pv27thah5jr om*m 7h0 g constant of 15 N/m is initially compressed by 3.0 cm. How much work i7 jp;wav9 5h0m2tgkrmoh*m7hs required to compress the 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 from rest from the top of a 50-m high slopel5 kvdh01rdi ,. What is the speedkl, ri1dvh0 d5 of the skier on reaching the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg,owkli6- nw(g- pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in k-(nw-l go w6ielevation?

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 pycqexwcj :e,d+d2a b9;fh2 ,v lane. At the bottom, it has a speed of 9., jecc9w;yfx,v+ ba de2:q2hd 80 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m abon5arcjo0g41u5kexz /w )iu: xve the floor, its potential energy exactly equals its kinetic energy. How fast is it movin5n ze1ugj x0c4 ak5i)x:rw /oug?

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 with a kinetrt(57xf gb,9db0mw zfic energy of 40 J. At the exact top of itsgw9bz(5 x, fbtr7d 0fm trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a e9( 1htb jnqrdtrc/;(kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch pneqj1(c r9d /;br(httoint, 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 poinrp9tod n*5mx if*nv, .t 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what wid9n *ovirm f, *.pt5xnll 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 startsasq 1-v 4s; ptmh)m;qz with a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Negla tm vzh;1qmqs-;p4s)ect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bor b9la 5ny:0pm.mqub9 r wn4z(ttom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what w y pnub9w4rbl n5az.9mm(qr :0ill 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 at the bottom of ik (k +n+cfeejg 5kd(7uts 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 lene8u s pmu+-f,. yqy8ltgth 50 cm is pulled 0.15 m away from the vertical axis and released from rest. What will be its speed at the botfpmy ul.- 8+eyus,t 8qtom of its swing?

A. 0.2016 m/s

B. 0.538 m/s

C. 0.806 m/s

D. 0.672 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 horizontal sprin.( mufy rf)fa92) jd3gc7h hxg.x-hxjg with spring constant x3rc(d hhhjuayjm7 2f-) 9)xgf xf. g.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 car to stop for a red/x a7+xyqid2x f6 mkx1ho/0 ol light. What work is done by the friction forxmx k 2/hiqy+do xx/afo071l6 ce 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 horizontalx 0 ke6f18z88nuevppu surface is 50.0 N. Ifuu0z x8688p pvke1nfe the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 21j4ghzvj a 54* 0z+ wpjo+med;ad ,wqi4 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slide?,m+5wizp4w a4 j*+ag0q hezvd;j 1odj

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 surfacsbb wq-/cl rb hrzq+7w7my(7 4e. The coefficient of kinetic friction between the b ls 7h b4q+zm7/wy(qb-7rrwc mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m highmfq7*(c j8dis8plfp 6jv4m;q slope. If the work done bys;8 6vmjm lfcqij4(78*pdfq p 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 lonon5:qo/gq21kv7ph i lg and rises 2.0 m. It requires 3200 J of work to g:/q iqpolhn52g k 1vo7et 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 at ,:a,izhlg z1pr5e1t d 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be ,lh az:r1 15,gpiztedthe speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the groundec4r -l *rhj;*fbx-ld6 e6ogi with a velocity of 7.00 m/s. What a dxo 6 6bj-r-cr*g4ehifll e;*verage 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 using energy w ih 8;xfu3qntx8x )eo0qex (m5hen he runs up a flight of stairs 10.0-m he0x8t3i qnxfhe 5o m;8)(xuxqigh, 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 of 5.0 m/s. t1gh:jg1 );+x ufsfq2h:iik e What power must :tiqx1 + f1)g: k2; husifgjhebe 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 1.0 hp motor that runn h ltqijau1ou9o.dzg).:p.4j8v9t o s for 1.0 hr? (1 hp = 7j8:).4l a t9h.odtnj1uqou z p .voig946 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 much force does hpwon*..k d(vd l;wk4evpp9n , er foot push with when she is traveling at 8.0 m., e;w(nwko4pl9vpv npd* dk./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 frfjow e j4xw d3qhj*24+om 0 to 25 m/s in 7.0 s. What is the average power delivered by the 24jj wh+do f 4wxje3*qengine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95