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

1#

What is the correct unit of work expres92zen q) vqih+yy4 td9sed 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 n+:5yc,tx df 7qryu2p1uk(lbf o motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount oqbuf -z-d*p8ex v, b0e-5ylijzws6h 6/ntdv7 f work yoq8w 6v,d /ibpzvb5z-hx70 ydeln *6 t-uj-fseu 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 hel,.u6bv .evxpp) 5qmj1buvc6k d there. How much work is being do5 x. kpvb6 c,bme)vv1.6jqupune 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 r+ 14fe um nhuc v5vpe ta-lm;6oo76s2a constant velocity carrying a 10-N object, the amount of work youlup ; cavvnm5ou6- 4me+7rt 1fo2eh6s do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to its or/bcp sy5p5uq7 thxmbc*8h t/2iginal position. If the total weight is 30 N, how much work was do2up8 m*c5p q7ht5xcbyh b//tsne?

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 objec93ca-a3la io uz5g(ylt 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 done be 7466 8p ctqjf)mennk1e xg1vy gravity while the ball goes up with the sign of the work done by gra j7q) 1cfen1gtpxm6e n4kev68vity 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 i.l+m;x,ba c )r hozm3k fwu(8versus position (F vs. x) graph, representsc,rx +a.folkwmum()i ; h3z b8

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 done by rhx(41 lh2moxpz9:o dt zp( l19rodxxmhh4:2o 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 obje bzgdu ;ki w +oge8o6/2ej+)luct'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 object's kinetic e e;y.md dp )auo2* echgu f;amcaz5+8.nergy

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 objf5:2 ws1m a j2pi.aihyl33hu gect 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 m egwexwo75gwim /72( u.a z6nouch as a car, and is moving at twice the speed of the car. Which statoa/2g5gewue6 7 wi zon( .x7mwement is true about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has mnq6 zlo.bj,.+o hz0zhalf the mass of car K. The kinetic energy of car J, compa6nlm zqh. o0bj z,.+ozred to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of il bov2jg0jb3n su+20o ts original speed. What is t b3sj0jv+2nb 2uoo0 lghe ratio 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 pebble is dqd5vsgn(: xli/-qp 8c ts3h. moving at a speed of 5 m/s. If both objects have the sam(x p8qni g5v d3h -.s/dt:sclqe kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg zskk7aa66 nk6mass is moving with speed 4 nk66skkzaa 76.0 m/s. 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*65 4t v,/qr.ise bmacpofw q ,k1k)(ag(cft r skid a certain distance on a straigfb)mc*kc(gkv p a5iwf.a ,qr o/4(tr1teq , s6ht, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an elliptical orbit. Neglectin q3qs81s4nqku g any friction effects, what happens to the planet's kisu 4q3snq1qk8 netic 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 5hm1f6x*r1c2x m qnd bprinciple.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; kx^2$ is

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have negative ppg-yc h0a .ua )45 js1aedeqa;otential 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 groul70 cgik+6m:eft*gklsf - 2vcnd. A second object with four times the mass of the first if released from the same height. The pce2ltgs m:l+6c- 7f *gvf kki0otential energy 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-6uygkme79 q1v46 kyp ca lqf: the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energlyv m u6q1-9gpqk4a6ke :7f ycy 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 en 78(dvur:tro tvf6ux/ergy of a system

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, ton;- w4oo,rzefhp4zoj c)j: 1c its potential enerzj-o1 cjznhwo;f r ) pe:44o,cgy 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 ch nml3f:e;3yt5fm cy /ar driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object abm9d) ic09 twmi,/k cqre sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to c ,9it90db)kwic/m mq 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 r :d4k,bfx1yt7s4h rx $m_{1}$ 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 mechxw0, :nrgv9y tanical energy for conservative forces.nxw0v,gr 9 :ty

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 3ytbp7:wbba: h1d2 ag present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the a2gp3ba:bh7dt b1w y: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 energt9-lx-wb xz:tbsy1z r+(.qc h y. Do not ignore air resistance. How much gr:ty-z1w. 9( sqlb+r -zbhxtxcavitational 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 andq+*t af7 7x*n+5zgy3 ujmt 9qtuigr h( loses 30 J of gravitational potential energy. Do not ignore air resistance. ju+uz( yq3inghxt * f*t79aqtg5+r7 m How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of energyw bvovcf3)aehq95oy i 8j980n4f0t mm.

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 isr:)kvo3nw h: 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 in SI units?m h1xnq.(h3t*0iy32:j iups 4lfc pcu

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 sld +gvxez/r42.w+ hd not a unit 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 di9z-ykh3x;p5 n b 4ihjjd 3 times the work in one-third the time. To do so, youhz3 xnbp h5jjk9;i4y-r power output must have been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car'sos/kt .vk(ai,z c6)fxie9/n 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 ve1sm-vld s-5xnrtx8:x 7f5erycz4vz;rtically 2.0 m and held there. If the object weighs 90 N, how much work was done in lifting it?v1r5x;z8zs nm e-dsvy t:5 xx- lfrc74

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a constant ve(ppf r 1w lznic6u9f7 moc9):m ff6aw+locity of 0.50 m/s. What is the work done by the weight of pn6)f 9r:o91 w6 wcf(fm+uacml f pzi7the 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 for a disab.7y q0qe/qx tance of 50.0 m. What is the work done by t7qx.q q/ae0yb he 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 isga+muja, 5n bl )n4sg2 nf).wt*mf3mx pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevator?uw*f)n2xa 3.g m)fmsn4 b am,j5ltgn+

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 w3 y1d 8z-ku0hyp m7mluith a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the 0ml7ykudz-3 p mhy18uelevator?

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 along a *; ajf ci*aq8v$37^{\circ}$ 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 unw6sefnsp2)b o 0v;w 19.mnp.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 surfa7i(e 4z qhl6mmce (assume no friction), wi(e7qhmim 4l6z th 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. sf)73n wwb6v4; xq)tdi4gxfi The graph in Fig. 6-1 shows the force versus the object's positionw 347x f)q6)tx;in iswgvd4bf. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph inyx 4kd;b1i-pja - ps*f Fig. 6-1 shows the force versus the objebafd*;s p p1y4i- -xkjct's position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in tf,x 6yeb7 his:8zw*d18t xn sihe 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 dx:*s8 exnb61ztsi87hify , w4.0 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+5faisu q/1nh.gr.0hxxnpu) force. The graph in Fig. 6-1 shows the force versa .hniurf0+. gu5s1h x/xq)pnus the object's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200yqs6 f+/;bt:s,qe5tewy9 yh hp5 vld * N is applied to move a 55-kg cart (initially at rest) acros,h wps ebq+5y5; e9yyq vltd:6sth*/fs a 10 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 200 N is applied to move a 55-(8 ; zmbs rmaemk:yh;wmy*q(9kg cart (initially at rest) across a 10 m leya;mmy 8;k:z((*b9hes mqw rm vel surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is movinzz u .xv: sind/rb9p)4;6bbtmg with a speed of 5.0 m/s. How much work is required to stop the mast bpmb rz 9:/4;.uzib6)snxvds?

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 mo pptiy65(h8qcving at 25 m/s, what distance is required to stop a car movin yq8t6 ph5cip(g 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 cocke is;(q+uzfs;weokm.1 zd 0d4nd by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming t;fk os(n mdws.10q+zdz4u ie;he 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 verticalkhigejix ll31/.16/( c xkans component of 60 N. The force is applied to a box which rests on a level frictionless hj e.i//lnx1 gk16 icalx(3sk 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 shdeb* tv+ 0v*zyot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before *e d*v+yzvbt0 stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m a g-ajh5 bv50sobove a floor to a height of 13.0 m above the floor. What is the change in gravitational potentij05h ba-v sg5oal 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 l5.gyw a1a6 jtpong and rises 2.0 m. If the plane is frictionless, how much work was done byj.a 1wa56typg 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.yaud ia4jd ;20 What is the springd4id0;y aju a2 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 by a spring constant of 60 N/m. Ho9vcq.mpjioagh / *)d 4w much potential energy does /*go4mvp9h cdqa.ji )it 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 compresn c3aw-ac 6zi 8y)wboumzqoh4:/9x 6ms an initially uncompressed spring with a zz)yqhn/xc9 w-imoa3 6 8 4:6 coubwamspring constant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring ) *-r11+jpuiicfr5 uhhgjy3bof spring constant 40 N/m from x = 0.20 m to 0.25 m? ( -hruf5u+cbyir*g 1jphi1j) 3Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is inic2g id jd(jn(cyk( h:2/ufv 0ltially compressed by 3.0 cm. How much work is required to compress the spring an:2v y/0u(jdfldhc2c n(ij g (k 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 slope. Whatt+9zg-as3cb g1 if ,sgb.mhx3 is the speed of the skier on reaching the bottom of the slope? (neglect frictio3bth fb+azigm,.s 3g9x -1gscn)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initiy :g;1z(fb.ptaa l4hji6w, +cr+jd hh al speed of 4.0 m/s. Neglecting friction, how c ;gf+wiad tl1( baj,r.+6z yphh:j h4fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plane. At t.bgrq+i d46u fhe bottom, it has a speed of 9.80 m/s. What is the vertical height of the plane?qdbr g6 .if+u4

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. Whej lfoeqfm-56 tl0p )x3(un hm(n it is 0.70 m above the floor, its potential energy exactle nhmqf3ul(jx 6m-fo)(l 0tp5y equals 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 straight:avup ;jf-0wk up from ground level with a kinetic energy of 40 J. At the exact va 0;kpwju-:f 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 lem11 p p.f;9dpk, gayvqaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, rqa1m1 .df;k 9gpv y,ppelative 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 abj h9ay-qh74qm*ro60 nayun5z vwx0e*ove the bottom of a dip (See Fig. 6-2). Neglect frzo5xhurhj qe4**nq7 aym0avwy9 60-niction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5f: x6nc8jp r-ave zw,1.0 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 abovw j:ncpxr f -v1aze6,8e the bottom of the dip?

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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 starwphm (p4je ;f(ts at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will jp ewpm(hf(;4be 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 its2cyvafk)m, af1+y s;7l5bqi8jxz xx 3 swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.21 m away from the vert* q0av 0ztvexzg g30n(ical axis and released from rest. What will be it00znz3* v g0(v qagtxes speed at the bottom of its swing?

A. 0.2856 m/s

B. 0.762 m/s

C. 1.142 m/s

D. 0.952 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 b)tre+jcnep -e;7vo z/m2do/horizontal spring with spring const +tn d2eez;/pm- or7b)vojc/e ant 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 /k+) hwti x(eddid/m *her 2000 kg car to stop for a red light. What work is done by the friction force against the whwed m* /tdi d+i/h(k)xeels?

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 ;aui+w g7//wf5jcdqz*g/t sz kjnzl1. oi-.a between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance wiq f1*+n/.;tgadcz 5jlwiw 7kjz- .ai/gs/uozll 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) j./vw0g2d n7djv xfzsy/as8 rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constdwds f0an)2gs xz. vj8/v/y j7ant 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 appl31/q.o*fsx p)+fl w+h dw imgmied horizontally to 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 of 10 m, what is the change in its k+wg f* fimw / qs+m.p1xho)3ldinetic 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 rey 36yim f -(+lf mrm3vpv,wj)est from the top of a 50-m high slope. If the work done by fricti3rmy-vlw pjie+ m6v,y(3 )ffmon 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 planej pt7y ,7yc xf-g5+rmb is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane.p7-y +m,rgjx cfy5tb7 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 i3me c,xvir t t)q3(,ggnclined at 20e above horizontal. The coefficiemit( ect ,g3v3qr)xg,nt of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped p-z1 xsvs/m3ofrom a height of 10.0 m, and strikes the ground with a velocity ox3z-mo v s/1spf 7.00 m/s. What average force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using e :sxqp/i/ki 6 vgp,zh+upd2 n*nergy when he runs up a flight of stairs 10.0-m , zx/*p2+q6:nk/uhidvg i psphigh, 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 velocitynxk 7zw9-f22d, 2qa/.e4/kiy buy l x bdqmzs, of 5.0 m/s. What power must be deliksl/ywx imdkz/x,. z9dq4a 2b2yq nefub72,-vered 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 kv;f,lxw +bz/hp motor that runs for 1.0 hr? (1 hp = 746 fz klv+;/w bx,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 mu ,kw0 ;qra0imyo/rq-f ch force does her foot push with when she is tray-q ,ar0r;o/mi qwf 0kveling 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 rocs6t j77 fq)s. What is the average power delivered byq7sf6or)cj 7t the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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