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

1#

What is the correct uwcw)gol3aj nw ;7 lo- zu(r)6unit of work expressed 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 8n pfgs mp0)loo87z6a system if 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 against a stationary brick wall, the amount ol6m4r-9 fe+4u+vr,egqu h bvn 3*xga of work you duram gvv x3geq-uo9e*+6l 4 fbr+n h4,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 ve(0lao6t.a x ovrtically and is being held there. How much work is being done in holv.(l6axo toa0 ding the box in this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carrying yc 28exjilv -g )kb-u:a 10-N object, the amoul8vx: uke)-yb2-ic jgnt 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 vertically 3.0 m h q,l6 e nz+i8i0m/himp,)qjsthen returned to its original posi)qni ,m,+8l / iihjzmpshe6 0qtion. If the total weight is 30 N, how much 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 acting on an object do work on the object?pij/p v.nu.2qy ppm)o fm -35k

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 workr4m 9 8( k3yop0owmilg done by gravity while the pmg480kriowo( yl3m9ball goes up with 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 positi4fm8:nm)l i rv *gt8waon (F vs. x) graph, representsmg8imvlw4ftr ):a8 * n

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 txzx a/axd:9, che work done by the force F?azx/ d,cx9a :x

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,dts xzf-74u2l then 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, sm + d+q: ;dh9yqk2endthen the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kinetic enej12tv, c i+m c7mq8x5wwl2 awb:t or.zrgy

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 ty/ 7ip((v/b(xyd8my- m eqxophe speed of the car. Which statement is true about the truck's kinetic energy co( (xp m8bvey//x( io-mdyqy7pmpared 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 cwjkz; *gjt ;+e;y,,azofy31fi2 : flcktm)mJ has half the mass of car K. The kinetic energy of c mlg;3+yzt1c:ijj;eok k;fat zm *w 2cf,)fy,ar 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 witl- t.*n,h , fm1szkx 8ewvtot(h half of its original speed. What is the ratio of the final kinetic energy to ,1mxze to(nw.ks -l8vt,* ft hthe 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 45aqoyda h f2-a speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the sdhay -a5 24qofame kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving wi;a8h+jud zt +nth speed 4.0 m/s. Both objects encounter the same constantd z+na 8+uthj; braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain:+8d:mn lf 2/e ynotvs distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditoelmnv+:f 8:s2n dy/ tions?

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 u:yv7 ax0hpf/xc v8-doib10 rkk8 za:orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energy08i azupd8 o7f/ :ck:x0bvyha- r v1kx?

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 prinwu9 p04glcgkz1 6s+wrciple.

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 potentia8+bsovi m ;d.hl 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 th+3b ey0eyc8sb e ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second o8 bece3 yy+bs0bject 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 spreanfhj(;tz2 vvta v,sqx/3 59ing causes it to stretch 5.0 cm. If another 0.200-kg mass i ;v/ e2ht vj9s(xanv,3zatf5qs 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 oc8mul0/t y 5hyos)pf/ f 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 tre e0 59yt8uk4gfs65;axxiijf 9yisw ) ae. Compare its kinetic energy K, to its potential ener k9ufa95xs086g)si ji ti5;fwxayey4gy 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 driviny7*3+wq ) f,.z3jk kkrsux usog 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 5)l4l*a4 m m lor:oklzwith equal speeds along a level frictionless surface. They both slide up4:o5lm ozlmk4a*rll ) the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses t2 5s)zkby2akz1 -gf nf )mri)$m_{1}$ 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 conservatu( g9qn kn+ unu* mbb8ht+dp::ion of mechanical energy for conservative forces.d g 8b*b qknu::n +np9mh+uu(t

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 buildink /2gw8mpi knaxm: ;2wg, through the air (air friction is present), to the ground below. How dom2w82 ;iakxk m:gp nw/es the kinetic 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 and gains 30 J of kinetic energy. Do not i5 ft8l j+0dllfz,rq4mgnore air resistance. How much gravij 8 0r,q 5tf4lzfdll+mtational 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 aip u,( ie.w,afnd loses 30 J of gravitational potential energy. Do not ignore air resiste w,fiaui.(p, ance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of *o5dn;onh n 1t axt,rf/ 7/kazenergy.

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 is5h6i .gcqkbhi1 qc8 55c ljmvk0qxd:2

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 powe:iu c naix, gp3(/nm8tkizy+8y 07 noor expressed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a uniukl rr o lci03:7hxp1:ndyz-/t 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, y0wlm+oyzhp,l *h:rch+.x h v 2ou did 3 times the work in one-third the time. To do so, yourm*p:z+.yh 2cwholhh x0v l,r+ power output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engine mustol7b,ruf+ 0g l

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 2.0xbbu0*szm 5gjg37fa2p0; up whf3ux/ m and held there. If the object weighs 90 N, how much work was done in liftingppa fh 32b*0w/guxs; jbmuuz fxg053 7 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 wm u)fgefp5ep 08rr(3air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of tpg eu rr 0fp8me5f)(3whe 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 ly p2xqser;40with a constant force of 5500 N for a distance of 50.s24xl ey;p0r q0 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 is pulled upw oej3ept)k12 ward with a constant force of 5500 N for a distance of 50.0 m. We2 wjk)opt3e1hat 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 upwar 1 ila es7j14n/zgnjh0d with a constant force of 5500 N for a distance n 70n1i j1j/4gzlahesof 50.0 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 along a5rvx,,;7ic8 b )z*sdczs tkzv $37^{\circ}$ 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 sl aw5x46*ovmj;b2bmu dides 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 ssb o6 ,7jvuo -om.hgl,urface (assume no friction), with a fo-bguj. 6vlhoo ,ms, o7rce 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 dpngpr+4f23wtp; 5 rjl*(lrfi9 jxk8)hl /f xcirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the worf9f j lr(jrw +)5fk8 34nlh*/2xpigx ppltc;r k 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 objectaw m/faz5:xz)e+6ufntfc96 k in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fi6u ffz caax5w9km6f n):zt+e/nd 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.intlf9, ;d aijf(y,7u The graph in Fig. 6-1 shows the force versus the object's position. Find the work donf(il,t7fudi9; y a,jne 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 grapwu;. ssyk0p(h h in Fig. 6-1 shows the force versus the object's position. Find the work done when t. s0(swhuy ;kphe 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(2g aern 7n7u1gde*pglt ny), applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of ta tndg eg* n2u7e,1 y7(rlpgn)he 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 rsqit 1h */9 ,ofy7obt(initially at rest) across a 10 m level surface. What i,/t9roo1q*hytf 7bs 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. Hori 8** m9y*x hx0(cqicndp 3hxw much work is required to stop the mass**h r di * pim9380(yxcxcxqnh?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distaq j e x-bohe5d;buu-3.nce is required to stop a car moving ae- boh5;3eq-uxj.u b dt 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. Iwl) j hma; k-v:-s6ihzt is cocked by exerting a force of 20 N over a distance of 5.0 cm. Wit-zhm; jh6avwl:)-ksi h 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 wl; xa9y t+tb3vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floorwl9y3t ax +tb;. 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 balejgp0p8x,pfa ba9() hc+zf rl5 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 stoppin0p+p 8aca9j g)bz fl5x prh,(fg 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 above a floor to a height ofd 3z7i le sckgjin.:8)k ykq.. 13.0 m above the floor. What is the change in gravitatio.dc z syke8k.. 7gi kin3jl:q)nal 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. 1ivjivwpltrgq0 f:-e,8ew 8f9u;hr 7 The plane is 4.0 m long and rises 2.0 m. vu e ew8iqr7 l;p-0fhivrj fg,tw189: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 ; aq9b o.dt( gp5d3kvzto stretch 2.0 cm. What is the sprin(oadtqkb5 3dv; p9gz. g 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 spre+ +aaf8g18lm wbmt) q2w4hzxing constant of 60 N/m. How much potential energy does it store, when stretched by 1.a+glzmqaw1 fb84 w2ex t8 +)mh0 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 uncompreec+ax* /sxu q1 vy-3llssed spring with a spring constant of 25 N/m by 10 c/es3l1 c-vuxy*a xl q+m.

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 s btl d5to7u,86jszol(pring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretche8 t ol(dls6 5obtj,uz7d 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 constandv+hd )ccx hkwlb4 uz(e9 47-flepr4/t of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring ank)lcrw(zp49/4vdchhb4ue 7ef + xdl - additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. What is s/of8aa9h5w;a)pmb sthe speed5af 9swsb;h8 maoa) p/ of the skier on reaching the bottom 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 top(z hj*jjt1q: 9qvrui1x +dt* p of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will jji d*qtr:hjupxz9 1qt * (v+1she 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.yjno7 x5ubp pgc.a k51;sm 00e At the bottom, it has a speed of 9.80 m/s. What is the vertical height of t;.p5g 5jo uys0ecknmb7x1 ap0he 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 0.7 5dj0ttz 7n0aj0 m above the floor, its potential e7j z0dtna5t0 jnergy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighiniyn( kh 6-l;vvg 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory(nvh v-yi6l; k, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m zo)a.d.lb x3rleaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinet oa).b3lrdx .zic 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 dgi.9k r17j hmiip (See Fig. 6-2). Neglect friction, what will be the speed ojhk1 g 9ri7i.mf the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 w; uq6k2 ldmw5m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the b; 2dm56luw kwqottom 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 th n)f k,8n)u*se/pvk ale bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglecnk fp,n/e)ksav 8lu*) t friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball qahym;q6) n3 cat 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 0.25 m away from the vertica4p 6wvlg.+vut )c0mctl sh9m)l axis and released from rest. What will be its s. w9v ptmstlc+)64u lg)h0vcmpeed at the bottom of its swing?

A. 0.344 m/s

B. 0.917 m/s

C. 1.375 m/s

D. 1.146 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 initiallyedrbzz rp;+393l) ; hu/i-4pcnyuysd uncompressed horizontal spring with ;l+d) /nuz c hred3r3s4-yppu9;ybz ispring 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, slowea/x+twq y1:c 9;xme cs down her 2000 kg car to stop for a red light. What work is done by the fricxy:;e 1ctexm9+a/qwc tion 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 oy*efq7a anb3 th*7r; ne c90zobject and a horizontal surface is 50.0 N. If the y09rabfc7*ent*enzqoah ; 3 7initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 J of ki;bo7c iax2cp 3netic energy. The friction force on it is a constant 0.50 N. op 7c 2;bai3cx 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 ( /dhk;;ocl juon a level surface. The coefficient of kinetic friction between the mass anduk/jclo;; d( h 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 sqky0r ;g:whhw* y 3-xvlope. If the work done by friction3ww;qxh gyrv h-0*ky: 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. nz8hg* hkbe.izq(x4o,. j70 xdgnv4 aThe plane is 4.0 m long and rises 2.0 m. It requires 3200 J ofkz7e(xqh.4, gx0 8z 4nbvdah* i.jgno work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20e above ygwyck xd0)4)horizontal. The coefficiexw )y )dc4gyk0nt of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and k / zmq/l7+ycustrikes the ground with a velocity of 7.00 m/s. What average foc +qz/lk7/ ymurce 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-gpe o df 7pjb/k21w.i using energy when he runs up a flight of stairs 10.0jbpof.1p 2kei- 7dwg /-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 np7wy.lk/u7-g*fbk.j ttb v,m/s. What power must be*.g, 7wv.pk- uf7tbb/kn ylj t 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 energy are used by a 1.0 hp motor thaevk28s6kb dg vgk 8p31t runs for 1.0 hr? (1 hp = 746gvkkke 1p8 v3s8bd26 g 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 r:)yq7 d hcoj k,ycez,-ate of 500 W while riding. How much force does her foot push with o -c7h zd,q,jc ye:y)kwhen 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 04h-atqqu(k0l ,xewl/ o. tw:y to 25 m/s in 7.0 s. What is the average power delivered by lq(,tu4h/ .qtky0-l e wa ox:wthe engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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