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

1#

What is the correct unit of work expressed in ll6 6pmgy xnfv4o 952pSI 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 if0ds7)wab-sl y there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard again2oj lecx.zpqgh+ -k h uxu.:a8v. c4,yst a stationary brick wall, the amount of work you docyl2v h4 kx:o a.px.-8huu ,c.eg+qjz

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 andu5 j/km(qrac* is being held there. How much work r/ca*k(m5u j qis being done 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 forwa +u oz x(wlunshwy2(,*rd at a constant velocity carrying a 10-N object, the amount of work yw ysuu h,( +n2l(zox*wou 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 verticallyc3kwfj32h, w6i uw za7 3.0 m then returned to its original position. If the total weight is 30 N, how much work cuz2kw, 7 h6i3w fwj3awas 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 wob +dpy(w)0hu.gexe8 x rk 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 signce19s c 4hps+k of the work done by gravity while the ball goes up wisp4se1ck+h c9 th the sign of the work done by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) graph, rdka 0q h03m d2l0qfr7jepresentsd0hr3 7j200mq kafdl q

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 positio31s oezdwrtk xg1vl,j662 a)an (F vs. x), what represents the work done by the v21t1d6,e6k lgr o z)w xja3saforce 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, to-o ,1 kxacli9;k7dxr hen the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's kisk,ams db-;c; 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, then the object's grcc879efev +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 +w2g 4hy(;qnbzimd q1qf 1cl8car. Which statement is true about the truck's kinetic energy compare( yw1qqd8q+ b2 i;41nmlfczh gd to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the massa s gfd- 93d,q)ie(e okvr78pl of car K. The kinetic energy ofl )d(3k7 g8qaspr 9vfi-eod,e 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 ch;dlv-0bf*cqtjyjoy ./1v /bounces back with half of its original speed. What is the ratio of the final kinetic energy to t;/ coj h*0tv.j bycvf- q1ly/dhe initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving b3xky0qmp-djy l36r:at a speed of 5 m/s. If k63 - yx:r3pjbdlqm 0yboth objects have the same 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. s7 aw mw2,x.zr A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the 27zxw.rma,ws 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, ys sv/j e0i9x x6jrc+l m9ps-8and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, un ijr e c/8s6jy99lv sx+mspx-0der 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 orbitjq +tk 3lfv9s/x;s e*ks the Sun in an elliptical orbit. Neglecting any friction effects, what se 3 ;jktv/sxk9qf+*l 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 princip2ubpynz nyo .1 6n(vs /q.y,0dwevk a.le.

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 potential ej08c.0q 4 mjnw 6iwg9n j)k qfthai.e zsr,6q,nergy?

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 7(i6 c/s4k.o ozhlpjeabove the ground. A second object with four times the mass of the first if released from the sami(h lozo7cj6p. /e4ske height. The potential 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 the end of a k7zos;qpfp 2+vu m14t spring causes it to stretch 5.0 cm. If another 0.20 ;o t4fkzpq21s+u 7mvp0-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy w ggqh-)f58bf 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, w.z v p2 *o7 6w+xjopkxalp3x(to its potential energl( paxw36poov7kxw*+pj2x z. y 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 hlq,hp++)ui ffill.

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 )vbigem ap/ l+qo52 *g,im2plsliding with equal speeds along a level frictionless surface. They both slide up the same frictionl2*ie)+2v,l l p mmoqgpg/i5abess 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 ni.t4 ncv-zps:x21 lu$m_{1}$ 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 o hspn/jm; y hc/*y/+r+.+nxktlrt j6af conservation of mechanical energy for conservative forces/t+./nr6j /skxah nhtjymr; yl+cp*+.

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 frictio:d5tftutmct4*g-y1 z n is present), to the ground below. How does the k 5tc 4tdftgty:z m*u-1inetic energy (K) just before 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 etg81 rl - nx;6uu+frva*t9hm and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose?e;-xu g *ur fal 6v1nt8+rhm9t

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 loseae *.sjr7me9z9;gguo s 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy dem gu*j9ag9 r o.s7e;zid 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 energ t0owvo)yk, 1c wq2u48gv zv(uy.

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 is y.q:xj)p n3mx7gbp5 v

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 dnd8v:ue2 .3r3fy fw wexpressed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is no8lz7n 46z birqt 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,:+lbdqbb4ev ;w.cu85z hu 9rv you did 3 times the work in one-third the time. To do so, yu czdw q8ebl.hb+bu9r: vv54; our 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's(b4 aqj *3v/nkqg*zrb 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 there.m85;cm4progrhzc )ca3eg9aui )+ 0q*gp/ jqh If the object weighs 90 N, how much work was done in lifting augm cmr ajz)qheg40;g)3r * /iqp9c5+pco h8 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 inr4 hp6daq/+ fe+n6 stp the air a distance of 1.0 m, at a constant velocit fpnq4tde+ h66pa+/sr y of 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a xb.k; usav9 to.*d(qoh4r 7eq ws)ef0 distance of 50.0 m. What is the work done by t7su)s0f ;. .vqwe(qrak4b*d 9o eoxhthe 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 upwarv *ae 0jv(2,oicw/t:v e7sknmd with a constant force of 5500 N for a distance of 50.0 miac2/vvkm(o,tevw :e7 0 sjn*. 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 -zdn2 a7n 1ke.2dtac/kcwnlq 6kj15 jpulled upward with a constant force of 5500 N for a distance of 50.0 1l . jz/cd-7n 15 tnnk2ka62e qwkcjadm. 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 ucht3 g2tn2;t*1xtwrf )p s 7ghp along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides ;v :sq -wf3z6b ygmqzy( 3;ekm8.0 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 siste * axin)sjts-9r Sarah in a sled on an icy surface (assume no friction)as x-stjin*)9, with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. lnbpc43(c11maud4 )tj7xs p:b vol 6f6-1 shows the force versus the objella6v btb p47x41c3uc(1ds:mojn )f pct's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph.qtd5kk1 ahdd7 -c9e c in Fig. 6-1 shows the force versus the object's position. d57tk- ke.ahc1q9cdd 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 jwdcs49 hxuq6; dl4*o shows the force versus the objecs ux6 d*jqdo49 4w;clht's position. 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 F2y37lx-wk4d ym onzo8 ig. 6-1 shows the force versus the object's position. Find the work dondyk z-n 8lmo437ow2xy e 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 (initially at rest) xv /7( neabzldzv46v7 across a 10 m level surface. What is the fina zlan bv(v /v74ex67zdl 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-kg cart (j2mf:i)b*6- z. b(rih 8gb3cskqbgzl initially at rest) across a 10 m level surface.* f l2b8g) q:(kzbgc6.3r ib-sbjhmi z 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 moving with a speed of 5.0 m/s. Hb(rckwz 2k: c5ow much work is required to sto ccw(b2 :kz5rkp the 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 moving atv s tfg n6(kbc6i(h5ofvi *+/b 25 m/s, what distance is required to /6(t*+ bvi c ( ogivks6hffbn5stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is co2;/pq *a-4yz ca w vh6xd;xkitz.lv9fcked by exerting a force of 20 N ovezwa;dk zx. 9;i- t2 vqlfycv*hp4/ax6r a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a 0/wj(9 k7m miuzoj ad;vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and mmwjuiz 7/ 9d(om ;jak0oves 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 arx:dlrr:wi91bztk. ) 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 average stopprri l)z. rk:dbw1:9txing 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 hei,;)dy*if fo g fglc(t9rf ov,9ght of 7.00 m above a floor to a height of 13.0 m above the floor. What i* (g;f9 gfol,vt9r,d fc )ofiys the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an incl*-(ejy )fns-jdx u)wkined plane. The plane is 4.0 m long and rises 2.0 m. If thef ujk)nj*-)s-y dw(xe 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 spri:baa ;;worrl ,ng to stretch 2.0 cm. What is the spring ,brr: woaal;; 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 fdu1nv t/j+cdeq5k *zy9y a(.constant of 60 N/m. How much potential energydu q1+ct/9af z kj.vn5y( yde* does 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 uncompr:7d iczj(vyz em 9zy4r6ww t;*essed spring with a spring conrc vm6w *d:iz y4;wz tz9ey(7jstant 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 st66 .awk3d5lzfd 6:cx 0rjf qufretch a spring of spring constant 40 N/m from x = 0.20 m to 0.2q63 xrd0afczj d6.u 6:l5ffkw5 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 constant of 15 N/m is initz6 cw ao9faaub)+(s k4ially compressed by 3.0 cm. How much work is reqkzfw( )acuao4b9as 6+uired 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 from thuxz04i .m2ik qe top of a 50-m high slope. What is the speed of the skier on reaching the bo.ux4i2mqz0 ikttom of the slope? (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 exd 4/c0z9nd(pq;jdv ;xx f3atop of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast4zx/jd;xqef cad9;30 (pnvxd 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 inh-pwe h nb,k5ldmnk4p r3u-*w-l6hx;clined plane. At the bottom, it has a speed of 9.80 m/s. What is the verticah-bk -ml4n- luw 3h *w,ep6ph;kr 5nxdl 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 is 0.70 m above the floor, itpidxywk. )a6er o; 7-do3bf6ds potential energy exactly equals its kinetic energy. How fast is it moving?7opy boe6) ida;kwxd- f36. dr

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground leve d-h+tmb0lf8 9yxmj z4l with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height dz0h d l+j8xm9 4bt-fmyoes 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 theufx3zz;(- unk ground with a kinetic energy of 220 J. At the highestfku(nxz;zu 3 - point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts frog- )mhi inqd+b5dr i54m rest 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 thehgrdi5m iqd -)ib4n+5 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 5s of xvw/8i4vlzpv 4;2.0 m/s at a point 45 m above the bottom of a 2i wl44 vxf/8vvspo;zdip (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?

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 vyt;menn).y 0a06pzht g20e(4 se jzzdip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be 0e; pv gn2 )z. n0jh0t4s6at(eezy ymzthe 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 its swybbd ldx1i-3n.5x u +jing (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 ctilr50tetna,ys/*oli+m i k-x)5cn 6m is pulled 0.22 m away from the vertical axis and released frolr,-i*t5 n / i6l)xm kya+oi0e5ttcsnm rest. 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 hits an initially uncompress 4 nm)hn+b4yzl2zrpc3ed horizontal spring with spzzl3h4r2n4)n+cm b ypring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg j ;hie l/h,7 ya u(v3yisp+ng8car to stop for a red light. What worjaii/l v (;3u p87sh,+yenyg hk is done by the 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 object and a ho; eq d (vo1o( ybv9sg:alxo68v8eiz3orizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to o;z(sl8y9e dxq 3eb16o i(ovvovag8: 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 2f uezn0 c)p4vj7o7q s54 J of kinetic energy. The frictioc0p 5 )4uz7sejqnfov7n force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is appvuoylud pd8 3-1ez+2o lied horizontally to a 2.0-kg mass on a level surface. Thoz8p 2vuoe -ydl3u+ 1de 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 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 fj2 b96 ( qxyhn/qa/fns2 osx5from the top of a 50-m high slope. If the work done byb/ (ahx2f qnfnys96jqox/2 5 s 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 .dm iw-dnn87gup an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the tn.gd8 min w-7dop of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane incl7f4iptro - 0rky) dg,ofls.z7 ined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass fk, 7loyrzd)- igt.07ospfr4 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 he3ytv u166(8 pen;vzq cwkc: uflo30fp ight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frcfcuty3 ;okpq0uvnzp :wv(68el6f13iction 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 flighp j8 a95i+(jm)hdqkp ip 4py7tt of stairs 10.0-m high,pqt7 8)p4phi(+jjm 5dpiya9 k 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 velem;ju 3ozc9ee1mif;;msl .es;. q5 pbocity of 5.0 m/s. What power must be delivered to the object by the fezu m1sf3. o;me e;c9pqm;b j;lei5.sorce?

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 en:iio9nx(1i3 s .t y nxvlz(ds(ergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 Wsv xi9: xd3o(niilz.(( t 1ysn)

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 ovmg7k(hop 32zf 500 W while riding. How much force does her f( voph2z m3g7koot push with when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. lbw )9 d5k8o6k*rpxhi a hmn fl,.uh(. What is the average power deli l *6.)aihod95 mhk.bpu,nkh8fr(l wxvered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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