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

1#

What is the correct unit of work expsgk4iwc6y2 ,cressed 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 there is / npqef; y:.ogno 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 station-vc1x/b5eierw6 ow 4 sary brick wall, the amount of work youes 4x 5ebrw cio1v/6-w 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 beij 7tdg. z thki3o zm;lz,;ea7id :d1ov 6z+8jsng held there. How much work is being do.t3isj mz1hd7 jdtdza8;;z,kv+e oi zlg o7:6ne 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 carryin n7a q8ml2;jq mfp0rc(g a 10-N object,qfc2(p7 m; 0 rjma8lqn 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 liftedz*1bw jknxj+bd : 6r(h7wfk/ g vertically 3.0 m then returned to its original position. If the total weight isfjb r+6djkbwh(zw:k1n g* /7x 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 oa8)dt dnmn p//b mr5*tn 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 u/vxp8 av0 x 8n;u/crjdone by gravity while the ball goc auv8jvx/ p/x8n;0ures 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 poszs. )x lb y5y6zrk.*loition (F vs. x) graph, represents zlo.xysbly56 kzr)*.

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 represents the work donksmas+(+a gex *n7*oc/ bnzk* e by tekmx(/a*kan 7s+**g bcs z+no he 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 objectl 4.8djnz,epwm cw-hy8z+c : e'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 onh y3r. ik.r4+q3zvd pd an object is negative, 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 zers( g8bfdb(uix-mp co5b(gl+;o, 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 th9p ksq -2lq*oqe speed of the car. Which statement is true about the truck's kinetic ko-ls2* q9q qpenergy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the mass of car K. T;tx lmg6z z;s34(d gkcmk75kdhe kinetic energy of car J, compared to car K ismd4zmgld(g;xs3z k 7t kc;56k

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 bacai xb/-;aagy 2k with half of its original speed. What is the ratio gbayaxi2;/ a-of the final kinetic energy to the initial kinetic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebbletx 6.w4oht*)t8ib zy n/q; j*gq zwbo3 is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of th4 nbhytqzb/*zt3;gow 6oj*8wxti q ).e 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;pm 4 +dgmix,y. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force,idp+yx 4;,g mm 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 x*9/nh2dma)raaw emcyhl ( )+ skid a certain distance on a straight, level road. If you had been traveling twice asmwe )yaa xlh rc)/9n2a* dh+m( 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 masw7zof( 7kr p0ks orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet'kwrk 0(p7f 7ozs 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 principle.m2s cfos 2ymdvjw6/ /9

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 haveaezh8h1 x e 1nxkcpm,g2 vr:0. 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 grap)i4l408pjd pyatba a7x6 z4 ound. A second object with four times the mass of the first if released from the same height. The potential energy of the 8d0pl ijp6aa4xzpay44 ) b at7second 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 t/9olql d5afkwllb04+ o the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the w 9llq/+kd5 0bfo4allpotential 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 3yu rce*f*t4 ac)fr;sa system

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare itxf dbzi /3:9gq-nhh 6ms kinetic energy K, to its potential energy Ufn-b6g: h3 hq/id 9zmx.

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 f 0e idcmh*c0rd: txu .h;ys91up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal speeds4,4mmg nc:v gj along a level frictionless surface. They both slide up the same frictionless hill. Which jm:c4ggmv ,n 4rises 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 +,c/ u;rm6o l2/ixrjlx fogp,$m_{1}$ 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 mec m4k0fc y dw4i.icjr2*hanical energy for conservative forcesr.mdiwi*2ck 04ycj f4 .

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 bui it lp1 fwp l,; qi12gj6e5dj+hii8.lolding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compaq li 285;6i+t1 g l,pl.hwiof1piedj jre 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 distanc ju2cbgu,; f*be and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitaf 2bjbu*g uc,;tional 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 gravitationamm jp59gup0wus 2u6q:l potential energy. Do not ignore air resistance. How much kinetic energy :mgsu5ju0qu 9p2w6pm 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 conservaekoe-*v3(c qc .;my wwr *zz0ction of energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t isjeuwwdxpy557a bw( ;jg99-regt 3 z (z

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 expresnh85jtuu w znx m(di1.iq. iq6:,t /cxsed 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 uzx8(nlrzgg pr2)1/8 gae .l pqnit 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 di16r saepfy hl i,sb;/-d 3 times the work in one-third the time. To do so, your power output m ah-i ,fre6yb1sl/ p;sust 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 67sqp5a6cy (dziv ()tfb4;x imf5hym 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 2.5/cxw eed vn*.0 m and held there. If the object weighs 90 N, how much work was vedwe.n* /5cxdone 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 kx;18l xe6wlvvnuh*ez9 r ;b7distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of the b1;br e 8l9*xh7lexuznw 6v kv;ook?

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 u y5 q+,f*.+voavm +2rdw epl,gxdhoo- pward with a constant force of 5500 N for a distance of 50.0 m. What is the work donvl,w5.ofq rgea,2- y +mxh vp*odod++e 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 constant forqmmk4i)fi g* /c*ac1gce of 5500 N for a distance of 50.0 m. What is the work done by the weight of thi g4qi *m)ma kf/1c*gce 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 pulledwouho2 1* jlafg+ eip,q+- 8eq()cdpm upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work djqio+c- wfo8(2 l qug+ e me*),dahp1pone 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 au/du x0 rh w 1yl.dtc n1n0it)(ni;v-rlong 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 alt1s.ah(ykb m fs1771 cfkb5vt $30^{\circ}$ 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 o 9s 4a y.xu)a./k7+nsjcqjtgen an icy surface (assume no fricc s+74tn9y .aja/qu jsx.gek)tion), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph nuc8 s8c3gle je;w299dcc-hgg (rc o-in Fig. 6-1 shows the force versus the object's position. F8ch3ce- (g9;cre9 d j-nw oucg2 cls8gind 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 .r* oqxa nd3gn; i*z/jdirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obje;* on*x3 g/iznq.drajct 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 tp 2sty:my19fu he direction of the force. The graph in Fig. 6-1 shows the force versus the object's posiup2yy 91s f:tmtion. 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 objec6hoxwds-k .dxx3xey 4;1vp7)m yz r*d t 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 the object moves from .yyrdpxkd vh6*o1) s4xzx-;ex w73dm0 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 cart (initially at x *tfy qt39 ,if/r2(kzipomq ,6ht 3wcrest) across a 10 t9fi ,i(qfow6 tkpr3,hmyc2t3/qx*z m level surface. What is the final kinetic energy of the cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200l xg:z upgb n fb906ohn.+z3n.ss .si) N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the cart? zf 9s:ibo+b .nshg n6x).zlug0spn3.

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. Howxfembn.;x ag.;25h c b95o hjh much work is required to stop the maebfhh x.mo9x 5ga;jn5.2b hc;ss?

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 sto1ilo/4giy.7f ) zmgxvp a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condii)1fl4 / imgg7xy.o zvtion?

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 prom zpv/i be7:*opels 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 theoe7iz *vpmb/: dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical component of )q dlqu.5sb4b60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetid4q)bl qb5u s.c 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 into a bale of hay, str08kv57erft n7z5f 2zj4 ksxf dtyj0;jiking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before78 4 j ktdffjxe570 0nt;kj5z fry2szv 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 me:m*) r1vz/qs 2vvkk ,y2tcptoved from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the2v ,v srk1 *2pm:cyzv)ttq k/e 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 longorl o2;xmu -o0 and rises 2.0 m. If the plane is frictouxoo0l;2- mr 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 sp a(l5t3bco c,bring to stretch 2.0 cm. What is the spring con,botl(cc3 a b5stant?

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 constanio :ocw wb ok-0zh:0b9t of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm o0w:b c-ow:b9hoiz 0k?

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 inb.ig/ovo 1y1 ditially uncompressed spring with a spring constant of 25 Ny11o ig/b.vod /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 spring cokc62 2cz+b i; gwxa(9c) 6i;lpewpify nstant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched posi9wax c6 i fl; 62)w;bz epccyp+2kig(ition 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 compressed by 3i.0y oaoux6h e du+i.6.0 cm. How much work is r io.0ueydax66.h io u+equired 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 frv dzo7t -g2;gxom the top of a 50-m high slope. What is the spzd27ov-ggx ;teed of the slier on reaching 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 ofr 47b.nmj ;zlbgd.4kh a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be mo7n4bg .mdbh4lkj.r;zving 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, it +kuk x-5+qu,mkpmm8 m 4tif:jj qs;/vhas a speed stm5mi m+k -k xfvq:j,;jpqk8u4u+/ m of 9.80 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 4xlmu1r f6rggfm-b85 9 avgb0 it is 0.70 m above the floor, its potential energy exactly equals its kinetic energyb 5ur-x9 8frmb0v6 f14m glgag. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground leveu3qoz:8xntb:5 a.m4lk x: ueol with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To whaxztq3b xm4:kn: a. 5u:olo8eut 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 kinetic energy of 220 J.;((ts;pa,nzys *qx nk At the highest poi y;ta,( xkns*spn(;zq nt in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom of a dip (Seelkop*6l:tx o0s5 dxe 8 Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next sl* 0t58lelksd:6ooxp xope, 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 star,v:i9f qmxec 8ts with 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, which is 30 m above the bottom of the vi: x9 f8,qmecdip?

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 bot o o8/jd7 0hedms:-waptom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the spesdpwj/8hao7 :d0 emo-ed 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 bo j9ti l0sk.u*ottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled e3r )chq. 4llf30 cm away from the vertical axis and released from rest. What will bq. h3elrl4 )cfe 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 o i(bjvz ml:jutm19-k- ; r;rxan initially uncompressed horizontal spring with spring ;zmr(kb- rmtv9: u jxi1oj -;lconstant 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 li/kvnk 1/tw,jtght. What work is done by the friction force againsttv,j1/t/wk kn 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.z+i h(ef1ibb :0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25 fbhi (+ibz1:e.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 Jj/wohy4 -y, xkkupnx*zy 1ouwm.;/: d of kinetic energy. The fricthk . *;dux/ w-,omxwo:p4j uzy/y nk1yion 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 tohq ilyua1t( ;9mc7 5go a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance oog9h;tq1a lc( mui y57f 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 high 9e o/h0xa8noqj+ tx/xdnmc** slope. If the work done by friction iso+j*chdet90 xxmx/o *nqna8/ $-6.0 \times 10^{3} \; J$, 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 rises l(j,w+oz jdsy ;si75j2.0 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 the boxoljwsji5 7z+d;sy,j( ?

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 fro:nc)kza9 t9xuvl l* o;niw7h)m rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of theax *): woi7nc9 lvuzkhl t;9n) 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 ground xc 8qdkk9,xcj 1ua5mxh,m,d : with a velocity of 7.00 m/s. What average force of air friction acts on it as itjkx :dhux9 k 15 mmqacxc,,8d, 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 flighta9d 5ucab2 bt, of stairs 10.0-m high, ,59 abcua2tbdin
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 obj-nsyj dbn3( *eu:*wr7jjc:m oect with a constant velocity of 5.0 m/s. What power must be delivered to the object by tr*:djn- se*7(boj :y3ucnmwj he 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 r ;pba gb6np0s-uns for 1.0 hr? (1 hp; 6pn g0bs-bpa = 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 much force does hege 0 ko.adtvdkwtcl;4.,* m4xr fooxmcv kt a4*kl ;.dgd4o0,tew.t push with when she is 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 in 7.0 s. What is thbhab*6 ad1o-,off-sgf h : ad3e average power delivered by the engine? (1 h-oa6d bf- *gaoh 1h:3as,bffd p = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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