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

1#

What is the correct unit of work exxk7yyxllid*(5u )fkxf gs4r;: um jgpc.8m:)pressed 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 ffjf 8-ea/5s/7 rsbkl 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, th m:t(ehr nidt ;7mh49g79iyzle amount of work you4m7yh9 md7gt;ieh 9 :irnl z(t 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 muck,a tp-tj:.b uh work is being don. a,jubtk:t p-e 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 carrying a 10-N obxjvriq4ncp+: vh/vd)sm4;v (f3s+i, xm*usbject, the f( irv*;s)pnmxi: +h qjx vs+, vdcv4bs/m34uamount 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 ihv84 lf lw v)p nc4+o1:f msiimj38hy5s lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work :)lf+jvvf l4 ywc p ii3mmsh o8h1n584was 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 obj 2f;kchdr,z ,*xt z4nn2*ig awect 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 5u84tn qbpknsndby :x f0(fc ));5engthe work done by gravity while the ball goes up with the sign of the work done by gravity s05 4f( pf eydkn)u;ntb85gn qbn x):cwhile 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 ver rvth-7. x /qos x(:sjk3(aw.xlm7tlqsus position (F vs. x) graph, representss lkv3q (sx.jml7: xo7.htqxr( -w/ta

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 posit.8f 7tvu rwx)4rvhp/ tion (F vs. x), what represents the work done by the for/ r)w uft7vtvp 4x.8rhce 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, t)escggg1)f f-fi 5+cyp+r g k:hen 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 negat1t* diqlmz- f:ive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, th:uvc+ euv)sh 6en 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 movid.zvg(a9 o kb e63xhoasc)/q)ng at twice the speed of the car. Which statement is true about thc3 vo6oaq)k.)e9xd(zagh s b/e truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the mass of ca4oebakbu:nfe-g3 7;qw;o )g g r K. The kinetic energy of car J, com7bogg ea3nouq :; e)b-g kf4w;pared 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 wall0g0i.d tfxec/ and bounces back with half of its original speed. What is the ratio of tgt.0fc0d/ ei xhe 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 pebble is moving at a xbm-8 ,m/hlumbr:7d1hyy r (s speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's massr:-187dmr, /b(hyxyb su mmhl?

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. Ag5nyh)k yk(/8h:cf* p 6vh6w8uxivjd 1.0-kg mass 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 greatg8jp v /ci8 k:wky5d hx6*h6nh)y(v fuer 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 c ;.*rwn,mwye 4bevrx,ertain distance on a straight, level road. If you had been traveling tmybwr.w4,;*xv r, ee nwice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an elliptivrp zf*o:.9wpcal orbit. Neglecting any friction effects, what happens to the planet's kinetic r :owpf vpz9*.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 principlx l*+bcc u.3qux+1r * ozb4q(dms1dmpe.

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 systemh 5csz 8ifdb0. 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 aq:ro;vyh:;8y/ zy vlu height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to the fy:uh/;yv ozlvr8 :q;yirst 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 causes it to stretch q2pn2/ .iebkc 5.0 cm. If another 0.200-kg mass is added to the spring2/c pnb.qe 2ki, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a sys jk2 y2hryp9n9 jh)g2gqv/k9a tem

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 po kbqq+ ,5rl;yxwy 8:p q)*rjrj alfagx-2cy ((tential ener xq8pyja l:wklxy(rg y;qr,cb- +(*fa2 jq)r5gy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a ha409jfvu:8s 7f / h0v6pb1ly9 xe z osowfn+raill.

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 objec2ydvi9 r..ph2qw:4 /uf p sat*ablmt z53,ynx t are sliding with equal speeds along a level frictionless surface. Ths*5ahqi2dr 9nwf:. yb tp4l2avu3t,/ pz .xmyey 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 qap kh- *uhiy(1/nva:3q6utev w t 1wo5(lw*m$m_{1}$ 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 c,9qhus7g (pl s9bdu9s onservation of mechanical energy for conservative forces.ps7ss,ldu9b( 9hgu 9q

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air friction is prqhplw2fqjy +kg52 4e3esent), to the ground below. How does the kinetic energy (K) just before striking the ground compare to 2f2jgykqhe p5+w q3l 4the 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 tw5wpr;*xr 7ppms41 nkinetic energy. Do not ignore air resistance. How much gravitational potential energy did the bs rp4 r7w*x;pnp15 twmall 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 potential energ0 58dx rlxn6esy. Do not ignore air resistance. How much kinetic e en06dlrs8xx 5nergy 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 e6 q6+*kl,k, i*px.vtc khuj4tcu 6jpenergy.

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 isb/* mkbh,--s7zqaf n q

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 o f6vk-* gm:eowf power expressed in SI units?

A. $kg m/s^2$

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

C. $kg m^{2}/s^3$

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of power jzd8sin x62y5?

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 :me i7o -5ifnm:,trcrdid 3 times the work in one-third the time. To do so, your power output mc,inm7ti ::erfr-m o5ust 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, thex lsg ys *57wbq/f rkv/yv*2a9 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 b6j*ydgc. ybeu 9c 9k,vertically 2.0 m and held there. If the object weighs 90 N, how much work was db cd6 gb.,ujyykc*9 9eone 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 distancec/ th m-3/gzha of 1.0 m, at a constant velocity of 0.5tm zcag/h/ h3-0 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N fob ph2u3p-nb 9rr a distance of 50.0 m. What is the work done bhp2b9 nbup -3ry 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 force of 5500 N for a distancwr ile0- 4wh5ye of 50.0 m. What is the work done by the weight of the elevator?whl5eyrw -04i

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 h k:9qsqane5/ /hcmd4 with a constant force of 5500 N for a distance of 50.0 m. What is the net wo5 qm ha4/khd:ncq/9 serk 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 uyz .6n+kfe( yc:,d)8ymkd o vup along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down e8b:y kxm:b3i cwx cjka70mvb5i ,t11a 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 Saraz ccqc6c0mm-6h in a sled on an icy surface (assume no friction), with a force of 60.0 N at an ac-qc mcz66c 0mngle 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 obje)lm d7lh 8 vt6aa)ep:hct in the direction of the force. The graph in Fig. 6-1 shows tlhptlh e )m67)a8:d vahe force versus the object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object1ox,ohl.ntw 4cw + pv/ 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 frn wv,tp/+lc4 w1 .ohoxom 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fik 2oog w42-iwbg. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 g2 ik4wbo2 w-oto 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 fihd3ajo d oe7 5jpi6+7orce. The graph in Fig. 6-1 shows the force versus the obje a7dd 7o6j+e ihjpi5o3ct's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of *ofh:pxd9)u 3 gr+rnf 200 N is applied to move a 55-kg cart (initially at rest) across a 10 u+fxo:9 h pr n)*fr3gdm level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied t 5gp) llk qnfuo5cy 42bzt (*(c)(tmtto move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the cart?mcgt(pk)tc(u (5 oztn4 fylb)q*5lt2

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 speevx;- r;q 55 nohqdipvl x1p0h5d of 5.0 m/s. How much work is required to stop the mass0;-;qhnv1xh ovlq x5pi5p5dr?

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 di iex 6b9j/d8e+dd4cfq stance is required to stbd c9xd4edj6eq/+ 8if op a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a 2hxy,duac g0;w/ tgt3 force of 20 N over a distance0/u,23tcwa ygt;x hd g of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 8xvm7q7)z :(s4fajt du0 N and a vertical component of 60 N. The force is applied to a box which re zjst dvua)4: fqmx77(sts on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic 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 p6 o5n6uj;7uog f kbe0into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. f6ej;bnuoku5o 07pg6What 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 7.00 mmukv2 m06 7 cka9xcjq)3i ed6v above a floor to a height of 13.0 m above the floor. What is the change in 926aeqc0)7 kxcukmvvdm36 ijgravitational 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 u3ib5y0eug j -g10ypf long and rises 2.0 m. If the plane is frictionless, how much work wagy1u5bpuf0i gjy30e- s 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 springra eztnx:/3(aguek *v/jc7g9 to stretch 2.0 cm. What is the spzk7*e:3taju(xgnecvg/ a9 /rring constant?

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

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

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized -v ch2pzc 0c-w( nfef;by a spring constant of 60 N/m. How much potential energy does it cfw zv hn02cp e-;cf-(store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initd zbdvq3:;;xna: d 7zcially uncompressed spring with a spriz7 zbc;3:vd ;q x:ndadng 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 requiredwuo0.ii,uy m0 to stretch a spring of spring constant 40 N/m from x = 0.20 0 owi myu.i,0um to 0.25 m? (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 +rf:; qg,si v8epyvs*u;2wq c constant of 15 N/m is initially compressed by 3.0 cm. How much p:fiqe ,ygrs;uvc 8*s+w ;2q vwork is 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 fk .e93ydq /yvhrom rest from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect.d eqyykh 9v3/ friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with a3m p ,n;*u2jh k5udw o5itwku:3qr1( gb3ewj un initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving afto,jw 5*jtund2w5;kwk3 u um qp31g:(ibru3 eh er 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. Atd4, x+gd4n eu)j 7lnez the bottom, it has a speed of 9.80 m/s. What is the verticjglx7 nedz),d 4un+e4 al 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 ih6d 3;ob*vndka6rsb 4t is 0.70 m above the floor, its potential energy exactly equals b 6;3kdsd64vhobr*na its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts strai0n d- yhc1,kmeght up from ground level with a kinetic energykc,ymeh 10 dn- of 40 J. At the exact top of its 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 gr 7r7pzs-ye dsp9(udg:ound with a kinetic energy of 220 J. At the highest point in 9 7dgr(up 7y z:sdspe-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 45b(p p(n 2yo1r.r*0v9rk-n z8ebarhu f m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rollrvn*u-rerh 9nkp pb( z 0yo2 b8raf1.(er coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of3q(9bpfyc5osk n h29j 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 9nfy9j hcops2(b35 kq 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 bottom of a dip with a 6.v: ths yj jja- ev,mrsbe 7/dv,r) 2w5;dmqcspeed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster aj2. w; ) ae,:,r/brd ydsmj7 6sjv q5mtchv-vet 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 2wmei sgor-yoh(*f- lj,9h*i 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 cmtam ha9wko //m; u*)m. eqe(cj is pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of its swie.k(ma/ct/mw)* 9;joah qmue ng?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed5pg50ioi iz) ncfw 4h1 horizontal spring with sponc5fihpzi0 4 g5i)1 wring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to st gvgyj +9+ tvg9tvwb3dr;d;,b op for a red light. What work is done by the friction force addvg+t9w3b+9 ;v;j ygrbv gt,gainst 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 horiz40to y2l dvqn/l2a sk)ds1 8gzontal surface is 50.0 N. If the initial speev 8sdy2aq 0ks l)dlgt1o4/2nzd 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 rougs.468orfax v vh, level surface. It has 24 J of kinetic energy. The friv .orx4f68 vasction 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 level surface. )g 5hnmh1w+ ka( fl:h 4d0sinxThe coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in mnxsk5hhhwa( 0 g:4i1ldfn)+ 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 si/u2bq u(qu-*nir l .zlope. If the work d.2z / ru qq*(uubini-lone by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an id,qp31 4appb6fhghi 2gps:0g nclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to4p pfbg qgp6ph10is2 g3h:ad, 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 resvgwe 2ekdr9 6n8ecs 6rt 23)1mafyuq.t 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 the mass afc s )m63e a6eq8 v2engwrdu192fy.ktrter 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*yn ue +i:- tu sc umb7a6/a.zamo/8ls the ground with a velocity of 7.y6/ am:m7u* zabt s/+oauu8ei-slcn .00 m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a o8o6bqw94t vbkbj.jj;.f b l 8flight of stairs 10.0-m high, 848j.oqb w;.jokb 6jv lbtfb9in
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 oc m9:bjr055 n/7 xwtjseon:t j/d 1geybject with a constant velocity of 5.0 m/s. What power must be delivered to the object by the fneojgn7/ y05/ctsrb xm:t:95 1d wjjeorce?

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 mr d5bjj.z/zor trj 0(+otor that runs for 1.0 hr? (1 hp = 746 ro j0ztj(zr +d.5/jrb 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 x.iuu 4kv05/ ouc ,hgythe rate of 500 W while riding. How much force does her foot push wi/,o4i.0ycxuh gv5 kuuth 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 the average powe- h-jj5tamg9y r delivered by tjh- -m9gyja5 the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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