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

1#

What is the correct unit of work exo/p;zcsrg3 ip0vr6r, 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 is no w4 cu(0hy yc:amotion?

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 asdgxa6cs*lb -bh z62-j hard against a stationary brick wall, the amount of work you d26sb l-gzachj-b6xd *o

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 thehqib s,pf- 7cg9 6nb. raid7,vre. How much work is being done in holding the box in this positibrpdbcs, 97n iaivq6., gf-7hon?

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 co fvbg (z3vj)(db*l9q onstant velocity carrying a 10-N object, o(g3 lb*bv fj)v9zq(dthe amount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted verticalk4zha/6t o ,skly 3.0 m then returned to its original position. If the total weight is 30 N, how mh6 stza, /k4kouch work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force a 4eq(: rl9v jd4vtbdqmf,2km (cting on an object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Co *)7kzgb(+mmgzi/,5 b (r oajn d-kqrxmpare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes dow)7zbg- r/ +mr,x(i*j d5znaokk m bgq(n.

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 v3i jvl0l(ab qz/io6p8ersus position (F vs. x) graph, represents0( 8 vizalol/pq63bj i

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 v0u-woh h9d8 zkajd rcy +g0/9qs. x), what represents the work done by the fory0j+ 9qhzoa0rkhdu 8g cd/w9- ce 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 object's kinetic enerfu:23aska3 om4wfp)x gy

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 kiml02qyuv3 9ce sro83m netic 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, the+su:;wg r5+x* wure zjn the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed of the cu 3fzmv;0l7 a nqy0d2har. Which statement is true about the truckvlh7n0;d0 mu zya 2qf3'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 7+ylli xusbz1, ;tif5 has half the mass of car K. The kinx7z;l5ilyf1 s i+b,tuetic 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 of its orig3mwj*xt:br u j tc05/+hfzpy0f 7n*f kinal speed. What is the ratio of the final kinetic energy to the initial kinetic +kbfw0fh0urz/fj c *: t5pyt3*7 njxmenergy?

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 speed of 5 m/-a fzj n-;jvkze)u)7/cti.bru/o n 5v s. If both objects have the same kinetic energy, what is the ratio of /r-nvajeuub;nfzz) 7/ ktj5 vci- ).othe 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 mass is moving with speed 8kewksi 4q63 kc2zri34.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the grea4 8ek i63k2zcrq i3wskter 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/-av t+vq (uui of your car in a panic, and skid a certain distance on a straight, level road. If u-+( u av/vqityou 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 ; tra)pjik 4c)lvw8u0 the Sun in an elliptical orbit. Neglecting any friction eff u48)avi;pcwlrt0j )k ects, what happens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principle.6fa 3jm zp/q4: fttj(i

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 sy 9b : rd-onz;y7owmm)d lqy6b3stem to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A seconde ev dcg(a ttr(7992tf 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 firsteerttc(9 t2d97v fg a( 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)kw7rf. p .de5nkw r3-kxu +tc stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential enerkt kc r.rd7f w)w 3p.-nxe5+kugy 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 sy9* z3for7h 8;xonk.fbl7g m bustem

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 1l*ie uf:mt ft( ( msir.ce)j5potential enerimc)*ft5 u(j e1 .tsm i:lre(fgy 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 hill.b/ t oe f+-n(+ rqbc,w3b -e3gy,puvyh

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 obje(t/ fgm m; cx*r,itg9+df(ya e.u ti:nct are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionleitg t.xd/*f( crn 9e+fmm:t(uagi; y ,ss 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 l 1s:nh(fd9 y*omp5ghgcdo-1$m_{1}$ 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 mechx;1ajwp,s +rtj; f i;,xukxe+anical energy for conservative forces.ixp,s,1wtfa; ;;+k xru +xjej

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 pre 0wkp+bhshx 58sent), to the ground below. How does the kinetic energy (K) just s+0kx 85pbhw hbefore striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic ener+,d bdn+xi7bchv+j0 /kbl3j lgy. Do not ignore air resistance. x ,/h bb0d li3lv+bkd+n+cjj 7How much gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and los97uzq 8eu(l hues 30 J of gravitational potential energy. Do not ign78huu9 u zql(eore air 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 consh3v7.sp+pfa fervation 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 is50is7t x (i hsyc spc;.6:lkml

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 S,mj+om8 zxm-qc +v(z vI 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 obrwm dc9bgyk7 yb7 j4*yo+5-rf 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 did 3 times the work in olb*,zrp b 9(.ofcs cc7 .t./mvakuhj -ne-third the time. To do so, your power outpurck 7 h(o. -lus jm.a9v/z*bt,cp.fbc t 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, p .t tvy/49ihge k(e6ccy: c3uthe 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 h+lzr8j,h1b ir eld there. If the object weighs 90 N, how much work was done 1 8b+jhzl,r irin 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 1.0 m,,gs)8jbk1 ialn )zh6e at a constant velocity of 0.50 m/s. What is jbs) )gelnkz81ih ,6a 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 wv 5 5(6fciqryrith a constant force of 5500 N for a distance of 50i5qf(6c r5r yv.0 m. What 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 isrn 4,3 gmvr.osd d.u3m pulled upward with a constant force of 5500 N for a distance of 50.0.sn4dudgr3 r.vm3om , m. What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a ditd2qj; vi*pm0stance of q pdmti;*vj2050.0 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 alt8l 50; .flexticvz m6ong 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 hcs- )7x2khks n1qn 7pa 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 sue1k2f,)lx twd rface (assume no fricti2,fel t1dw)kxon), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction.c20n8lttz:q3wl iw j of the force. The graph in Fig. 6-1 shows the force versus the object's position. Finl3z 28lwqij :. t0twncd 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 in Fig. 6-1uqp4; q 0x0pt xf+ieymi;e37o shows the force versus the object's posi mi+4ex oxu qftyp7;3pe;qi 00tion. 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 the direction of the force. The graph in Fig. 6-1 g2p y.om vr(l(a6bk1lshows the force versus the object's position. Find the (my.o2kga lp b 1(6vrlwork 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 d hbk7ww4gfd1 nj 7)5qgraph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 6.07 ghn5q41kdb) jwwfd7 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially a8s vucnmx6ep5vf41ykh (73ru t rest) across a 10 m level surface. W prmuy(435v7hkn8escuxv 6 f1hat 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 ap x0+q/r( ai+xyn g-bxiplied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the fi - yibax/+gxiqn(x +r0nal 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 with a speed of 5.0 m/s. Hoo 2m1lfyuzh)idq.w qkh6( *:aw much work is required to stop the yaq2)l*1 (q odzhfuhmi:w k6.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 initia;ope /3txsd 8 :)7fb9vg cfnrw1h0cjhlly moving at 25 m/s, what distance is required to stop a car moving at 50 8 gt vhexr093fc:hs op7cnw;j/1)dfbm/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 prtn80 cf m3ogw7opels 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, assumin g fot8wnm70c3g 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 8 eq jl6xuc,u4horizontal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rqu 6ec 4,l8xjuest, 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 horizontaxby/ lr/i-rt/o7di e(mo /2 inlly into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the io //bi/md r2(lo iy7- ern/xtaverage 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 aznv98r . qrqhj.+ t5fwbove a floor to a height of 13.0 m above the floor. What is the change in gravitational potential ener9+ z qw.rn8fqh.r v5tjgy?

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 h7 uj grq(1o(flong and rises 2.0 m. If the plane is frictionless, how mu (q7frh(uj1g och 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 to stretch 2.0 cm.v ezd5q5oad2 vvm )*mgw9t21 g What is the spring cv em59wg*vo)mq2 2vda 51zdgtonstant?

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 spr)1, fwtd fdedy); gwu;nkbfg odol60u9 a26d.ing constant of 60 N/m. How much potential energy dogl2yu;f9db, fek6a)0gw odw.t o d16 fdun;d)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 required to compress an initially uncomprg0;zf t.li x:mlblh; w*jz4d0essed spring with a spring constant of ;x i:lf*tb0m4 z wj.l;zdgh0l25 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 of sprijhx7t+2 qt+t)a k n.uhng constant 40 N/m from x = 0.20 m to 0.25 m? (Assume thtj xu)qa++k thh7 t2n.e 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 initially compresyau u*gkkq0 /pni63 6me,rk/ tsed by 3.0 cm. How much work is required,/ 0*u3kukkp6 /gy 6iar mnteq 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 frove919z i6: qdsw6uk ;8/s(ca caxozjam rest from the top of a 50-m high slope. What is the speed of the skier on reaching the bottom of the slope? (neglect f89 suac:(1kjvz;ax6za 6wqd/9isoc e riction)

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 g*d o5thn4w *qkg, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will s54gnw o*thq d*he 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 the bottom, it has a m db)4(o h,zel-fipmr ; n,v.m0(e dhkb-4 chaspeed of 9.80 m/s. What is the vertical height of the plm(c-n)le,,4 h ( pvdm.f -ki dezh;o0rh4bbam ane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m abovem53iuv zs;cl- the floor, its potential energy exactly equalczv3 i 5lmu;-ss 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 straighogieht 94am8 *t up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertihi98ao me* t4gcal height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic eszmwr)i38mo1 r v8w t.nergy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vert3mw)vw irmr8.81 szotical 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 theeyf b6hlv, (9e bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of thflbey( 9v 6he,e 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 5.0 m/s at a po .:pymn+yzavs1 pzl).int 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what w.zn.l+:y1pzm y) apvsill be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a( y3 jrl2rza :osr0de. point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of th: .dzr2r lejo3r(a0yse 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 balledr f-we:- :yh 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 xz/jq g j64y2lis pulled 0.22 m away from the vertical axis and released from resgz2x j/ 4q6yjlt. What will be its speed at the bottom of its swing?

A. 0.30 m/s

B. 0.80 m/s

C. 1.20 m/s

D. 1.00 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 hifvkqpq6, i lb-t fjfd-sxr-)ll/35 r6ts an initially uncompressed horizontal spring with spring constantr - ix6)rkb,v- 5/lq6fjl lftdp3-qfs of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for c)nh xeld*qd+x p6 w17a red light. What work is done by the frictipqxwdh enc d+)1*7x l6on 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 focogy - 5 iaev47/+dyvdrce 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 di54+aye gi-o 7vd vdy/cstance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 J of k9mjn8zu4p 9fkoi( gf,s/ un38e)ni brzx **ehinetic energy. The friction force on it is a consns i8*, 4 znge uiux9p*(j9femfz/ )b38rno hktant 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 a*(gvk(ef .4ksry.ho lpplied horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic fr4e .hos g*vk.((yflkriction 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 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+l3qxj; oip/a slope. If the work done b+a p/lo;x q3ijy friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane i9w2rfp+l62cju 2 f(i o-qshd 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 the2cis f( 2 rq-26dfiuhwoj+9l p 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 incli(qw+ b 6zmxi9hj qxu66*; dtomned at 20e above horizontal. The coefficient of kinetic friction between the mass and biq* +9d(hjtxoz66;6 mmw uqxthe 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 msvorn66ta78m x/ t4 h-esfa/lpe-m)h, and strikes the ground with a velo-enfa6x/a7h t s orvt/4 l-mmpe )sh68city of 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 energy when he runs up a flight ot)e eo/0z2zt f5 roc1af stairs 10.0-m high, ia5ez/)ze2c0tr1 to ofn
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 con)9lztca :c5x 3zs(ft/sb- 5ncggd x2b stant velocity of 5.0 m/s. What power must be del( :gn d- cxc9gs)3/zttbxa cb52z5lfs ivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp me 7;fq1y, y,njt*p0mkdyv9e sotor that runs for 1.0 hr? (1 hp = 71f7*; ,0mktdypjq, ys9nv eey46 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 w, :d rdr 13:l0bg/ 5a;tzeeh3xgv dzyihile riding. How much force does her foot push with when she is travelingg 3/rebt z;ld zr xi3: ,1d0:vdyagh5e 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 averag 4tjf8 vygqb:*e power delive*q jyf:tvg 84bred by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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