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

1#

What is the correct unit of work expressed in SI unit6aeekc(7))(duee y sq s?

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 nobpzre *ctj2rr),jg5prp 0. g9 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 stationaryygyk g, u e+ 53sdqca;o4,q.sfr2z.ms brick wall, the amount of work you do. gfs;c352 umz+s y gayer4,ks.o,qqd

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 lif)ne.0(s4djgx o:*lt fv / eyslted 2.0 m vertically and is being held there. How much work is being done in holding the box in vs (/ t* 0egjdoynl4.:exlf)s 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 fo5m/zf3v* yrtj rward at a constant velocity carrying a 10-N object, the amounyzm*5j tr/3f vt 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 is9tx;3 *dkjfg/ u sx0rb lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much worft;xu/ dk* s3gbjrx9 0k was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on thj5k0elx9d6 z ve 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 f,;*jgj;eai bi(cwsg.ppm+* done by gravity while the ball goes up with the sign of the work done by gravity while it ag .* ijcwp*mei ( s+b;j;,gpfgoes 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 position (F vmr f7w7x ,5jks z;off2s. x) graph, represents7r7jx 2wsfk; 5mofzf,

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 de: or- zqw8u8v v8v)xlone by the force Fue8zo:lr8 vqwx8vv-) ?

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, the0jqq9o. yxyh7 f*ji.zn the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's kinet)rmq5ihgo cg,1 + y o:q4f.zua 2jswz,ic 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, then the object'su4 3vtw z+8n ;-iv6hdmh wru,c1s6 qvw 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 cart+gj)hpay9 8q, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the caj 9gypqat h+)8r?

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 hasc vwm3eny1x1va4 .b4i half the mass of car K. The kinm4 c 43iwv.xvy1eba1netic energy of car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half *1wuw+nk 4hcdsbav .+of its original speed. What is the ratio of the final kinew+wb.u+*ack nvds4h 1tic 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 0 g(ivkhv6-txrs 59fbd 28ybu m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the5i sry8buk9fx0 vg2hd6t (v b- 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 mass is moving wd pl)e) wkbu4fp2.:ivc 1.ofq ith speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distapk) c .w4 pbl df1oefvi2):.qunce 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 skid2(t(pt.jha6 y-tvs n e a certain distance on a straight vt.2tp(y- st jn6(ahe, 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. Negle2li::z w 2o9kzavaeq)cting any friction effects, what happens to the planet's kinetic energ2 ezaqw2la::9v zk) ioy?

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 +q*pt8h96riao,js4 d)n:ax gdkf s)u principle.

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 negaes4b4* 9n0nfy 9u);))qvxrwx czins ctive 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 rrinndcyr),) 5 o8m1hrest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential en)ni rmh r8r,)c odyn51ergy 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 attac)t:ws e1 xle..s/4v,b izzzob hed to 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 energy of the vx/1zwz ebzso:)i, ..s 4lte bspring 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 ai9kd(4) x3*bl hi /zizppzb /m 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. Compaf y,ek 1luewnv11o4 ywe/77my re its kinetic energy K, to its potential energy 1n 1 7 eye1vue/lw7fym4,kwoy 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) dm )lkd2vx/l0 5 .bpwdofj:b 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 are sliding witlwq n48t7tek jbsxp -)v ukc. :-hwe,)h equal speeds along a level frictionless surface. They both slide up the same fric:th. p wenqe,v-cx ) u-8s7k)bk4tlwj tionless 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 (z0q,8kqn erv $m_{1}$ 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 o2;v (uoz8mxs3;d rskmq i a)l5f conservation of mechanical energy for conservative forces.suom 8;3 )2 ;iazlsxrkdv(q5m

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 buil 6iro,g-qa / -1opzuljding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (Uoz/ jpgiauqo-, r1 6-l) 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 g0 75wwje a4ghvains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potenhvwg0e47j w a5tial 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 loss6lrh(wpqdhre o-36k ,bcz 8;r b8uc -es 30 J of gravitational potential energy. Do not ignore air,p;8sr- z wl c8hq 6rr-6edubc3hok b( resistance. 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 conservu6)e z oma,x:;;k gkivation 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 is4 pshhu1i c.q (:j oatbsk1bc,8p 26wt

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 le-cc uc 6.+rld 7 w5rw.obxs*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 i, y2coe.pjl n7s 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 yesterda(y7: fgqwxmg) y, you did 3 times the work in one-third the time. To do so, yoyq7g:)(gw x fmur 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 an6y)jean.uk 0 cceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held thern9jzm1otg2 7bf) -ocss; pdz; e. If the object weighs 90 N,sn;2c-p1g;mdoz9b7j tz s ) of how much work was done 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 distance of 1.d9ef e9:e(ys7/ ansaa 0 m, at a constant velocity of 0.50 m/s. What is tes afa9yenaes(9 7 d:/he 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 3s5(t8 g d 9yovqlioyst0ld7.with a constant force of 5500 N for a distance of 50.0 m. Wha l0 t7d o(ss59gyv3.oi8qd tylt is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upwar to3hcz j9ir15d with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the oj9c1r3htz 5 ielevator?

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 upld7x 7twzpihrp*ub 0+n 1 pnj(:ku0d8adq -9mward with a constant force of 5500 N for a distance of 50.0piz lu*a8r+mdp0ktw q xd(7: n- hu j71p0bn9d m. What is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up alqubrl:2 *zp-l 594vnqg fr4ciong 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 fruit3:tomi u5zlx t5*n6 ep slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume no fri +oy9vcz a+3lgction), with a force of 60.0 N at an angle ofa+vy go+czl 39 $37^{\circ}$ 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. s y;w5sjc,n-/ npj7e6l8 h*u b:dwx xx The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obj *be 7,ws5nxuw6 l-x/h pnc8jjys;dx :ect 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 in/hiyepa3z-0f g7 ln t( Fig. 6-1 shows the force versus the object's position. Find thh-fela03 ni ( z/ypg7te 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 the dirvn*;gm2,v z cgtw7:bw ection of the force. The graph in Fig. 6-1 shows the force versus the object's positzmw gbtv;w, cgv7*:2nion. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. w* d- 0k, ,ks,vt 0zj.dbpna;0yo xhuf6-1 shows the force versus the object's position. Find the work0xj,o,-,p0svyd .ktkna u*; hb zw0df done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart ( g12*5i4(dq qfq tqj,jdspq5finitially at rest) across a 152 qqf1(*dq jq4,diqsj tp5fg0 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 iq9ke fp6cf ,:7il4drms applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final cpmqf7:4 ,6rfke9ild speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving ( q hr x2:)4f5hkkliks-:v cujwith a speed of 5.0 m/s. How much work is required to stop h k-s:2hkf)l5k:( j4xrv qicuthe mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially movi 9dd rkix:g8b)ng at 25 m/s, what distance is required to stop a ca9:g bdr8)xkdir 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 gc yi+)wtx)8q fun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligiblef+ q))8wxyi ct 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 horizono7fum+va grl3oj3 2 e;tal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on ljv r27o mf;oa ug3+e3a 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 into a bale of hay) ld7;gni 0hemug76 jv, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before s)0 hgnvg76li dm;j7 eutopping. 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 abovknd57: udm n8.3sk1 nhh4 goma0cge-re a floor to a height of 13.0 m above the floor. What is the changeahmskr mo eg0 dn3u58g 7khc4n: d-n.1 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 4rql(np/px8lgx)i z, long and rises 28n l ,)pzp x/(lr4qxig.0 m. If the plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring tep)i)y9sc h u*mqzp.wkvh ) ),o stretch 2.0 cm. What is the spri u m,*wpq)k) s i9y)hhpcve.z)ng 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. Ho6 9gwfo, :hws e3)vk)ixr) fnyw much potential energy do)3)rs nwi x96h:kogyve f,fw)es 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 requbs80 -, tkq):oawyuvz2n r of jr-3nh5ired to compress an initially uncompressed spring with a spring constant of 2qn0bz )k :-,s2tv5ar f rh-o8oj unw3y5 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 g nnd3,/uk* vbstretch a spring of spring constant 40 N/m from x = 0.20 m tkv *nbun, 3gd/o 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 cy-cni465q jh )h q:rbj jfvc10onstant of 15 N/m is initially compressed by 3.0 cm. How much work isjch5b:i)j y- q v 41j6nhcrfq0 required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest fro, 8t4 cgaz1jtiz0m2epm the top of a 50-m high slope. What is the speed of the skier on reaching the bottom of the slojtp,0eg2z18tiac z4 mpe? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the /o4tyr s ;/qqbds-0b ytop of a hill with an initial speed of 4.0 m/s. Ndqs y;stbo 40/-rbq/yeglecting friction, how fast 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 incli1gqj 0 -2mx-yin2nvui7 ;uq coned plane. At the bottom, it has a speed of 9.cgmoqv 1nux; 0 2un7-q2ijy-i 80 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it v;. 2ywv(jkoris 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How frjv o.; 2vwyk(ast 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 st -q)64l bxj-hwiqu; k;fygohg0v(u5zraight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its totalhb4)u6( gz0ofihju- qy; -5;lqv w xgk mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground wix 74bon j14tlp7bw 0-k aam5bj.y0kik th a kinetic energy of 220 J. At the highest point in its trajectory, ibmaabkjl54b07j 74t0 n .w1-ikox pkyts 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 (See7hbuyrg5ljd7b3p xp cq6 rh ,(w7 5w7y 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 abovb 5wgpxcp 7j y77 (rrhb5367hqw,uldy e 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 5.0 m/s at a point 45 m above tjf br*g a/lp9g3 5u0wrhe 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 dip? rlfw*/u5ag9j 03rbpg

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 at qp( -e9:f4srf:enhl speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the rtln :4 e-:p f(s9qhferoller 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 ofd, errfw. sj72 the ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulled 0.23 m away from the vertical axis s/m1(ddnce;i and released from rest. What will be its speed at the beins;ddm 1(c/ ottom of its swing?

A. 0.3144 m/s

B. 0.838 m/s

C. 1.258 m/s

D. 1.048 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 homlu5o2e 4wudrc8b1c : rizontal spring with spring 1b :uourwl5c4mdce 82 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 b4 c fkel/ ;bavhq*.k(her 2000 kg car to stop for a red light. What work is done by tq.ck4(a/bf l*b;ek v hhe friction force against the wheels?

A. $-2.2 \times 10^{4} \; J$

B. $-4.4 \times 10^{4} \; J$

C. $-4.84 \times 10^{5} \; J$

D. $-9.68 \times 10^{5} \; J$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg objsvo/n5ta/tu)qdzvg y6 q53eb ;u,r 3 qect and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slideyv;3g3/n q5dv e r,ztoustb)quq56/a 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. pxvp3/rj(n:tia : i0c It has 24 J of kinetic energy. The friction p r/j:0ta vn(3:ixp ciforce 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. v80lzhir 9(pj 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 kinetvpz(8 hj9irl0 ic 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 vy -nf1jw xb- nzio6:1from rest from the top of a 50-m high slope. If the work done by friction x1-b 1zwn 6ij:o-fyvn 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 pla,rr1 jkz3 fkdnd,n .1qne. The plane 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. What was the magnitude of the averag,f.r qjd1 ,kznnkdr31e 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 reno t na*;n5sl*2j--ee2eb5t: aqopztst at the top of a plane inclined at 20e above horizontal. The coefficient of kinetttjol 2-a- sqntee;nn:*b 2 5 azoep*5ic 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 from a height of 10.0 m, and sc,63* y mdnfmftv c 3-fmz,ml)trikes the ground with a velocity of 7.00 m/s. What average force of f-fcy) 3cm,3v z6tmn f,d lmm*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 energ t6i-mng/yl*s(g y2pqy when he runs up a flight of stairs 10l -q(*2tyng/sp6g iym.0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5.0 m/s. Wlfbla )(g*vn5k - fsk;hat powe)v;5- lfgbfnk akls*(r must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energn5bitczh3f 8 .oz3jg;y are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 Wizgz5c38tjfobh.n ;3 )

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 br 36uodj83gb8 2rhzz5q fce ;the rate of 500 W while riding. How much force does her foot push 8b82choqd u53jbgz;zrre3 f6 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 the average powk9p.c.f9nl nue ,m5fc er delivered by the engine? (1 hp = 746 Wenmulc5 nf9.c pfk.,9)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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