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

1#

What is the correct unit ojf19*h:0d)hl6 qlstibzl f;n f 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 system if there is no ml u,s mob/bqxc6zrxt:nl8 6*2otion?

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 y7 co,g7(tf vxbrick wall, the amount of work you t v(cxo,yg7f7 do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is b k1bk tayzkgg7a+ja b4zl25 *1eing held there. How much work is being done in holdk521byj t*zag kg17ab akz4l+ing 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- da e:v/p5vm,h(wrh5aedz x- velocity carrying a 10-N object, tha v/5pare d-- xhvmwzd,(:5hee 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 vertically5v vsg x(5 (mjnsdq29pe5l(dg loug4- 3.0 m then returned to its original position. If the total weight isdo(g5mg (l-5suv 9vpn(jd 2 e5sxgql 4 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 worg-evpko15giqa-, mp n,8s+dvk 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 )m9lnoyi1o 5 xup. Compare the sign of the work done by gravity while the ball goes up with the sign of the work dym1il9xo) o5none 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 Forceh-:0ixnuu60-gx g edb versus position (F vs. x) graph, representsd 6: gg xbxe0u0in--uh

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 vebf /9rdkrn 5c;(ov 1qcrsus position (F vs. x), what represents the work done by the for/ kfvc5qr b9d(1c ;ronce 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 onhggi-ijf8 uo/7e) t 4y an object is positive, 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, then the object's kin4 7*e3dk cnbhketic 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' 0.;e;rawpcvwg:8ylp oc:e; fs 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 k2jo*6 z pf+ey)ds(j;i;vnhdc + kx a2as a car, and is moving at twice the speed of the car. Which statement is t*ky+d2s6 ; v;jk oecjahd2 xif)p(+ nzrue about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, af, qa,zts3abl ) tez/uu, 6q+gnd car J has half the mass of car K. The kinetic energy )qgs, z tblt6zq,3+,/u uaafeof 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;d*0s+lvll9ag,r klw and bounces back with half of its original speed. What is the ratio ofd rll;0,lg+a*lv9 kws the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a speed ov0 ,9l/xr bgn)j fmvzbb6es)0f 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mar6bfvb 0z,lnex)mg9v)sb j/0ss 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. p/gx5 8jor0t*v n q.8shoe*hk 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 travels0vx k 8 .8/oht5psh *ejg*nqro 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 certai(63wd vn0j cfgn distance on a straight, level road. If you had been traveling twice as fast, what distance wouf6n(vg jw0cd3 ld 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 orb :f kaj*2eqw, 5;p2 jbqitn;jrits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planarpjnjebq; q5 *;2: f2kj,wtiet'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 prinogh: 9eyar tl1i cv9:qyc :su4j/ +m1drk5vn3ciple.

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 energy, 6*v(ufnkspz ?

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 second objectt akcplo)x((jvq3f,un4i 5 7 i with four timesc)(,( fi37axn5jv lqp 4koitu the mass of the first if released from the same 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 spring causes it to stretch 5.0 cm. k hu+u f(f h1za5s87luw( uy8iIf another 0.200-kg mass is added to the spring, the8hiwf 1y7lukuhuu (5z+as8(f 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 enerx2 k hd+,tcwvr/q4 5lugy 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. Comppolqdw( -/3/z3d0m9162 ax9ez fsnqbi v rwiw are its kinetic energy K, to its potential energy -im r63sw23p/z di0aql(xbwwzf91vo d 9 /eqnU.

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 hi;h7 h2xct 5dum+y, 8fo9v82bohqhce ill.

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 slidicp v5 4*s8oaykng with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whicvysap58 *kco4h 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 j-yrpr 5ru/l8$m_{1}$ 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 conhvxz7 *i- bk +iiep,/pservation of mechanical energy for conservative forces, zei+ hixp /-*7bkipv.

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 0ty:yw* erb9c lua,* dis present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) attubcy* , a*wel9dy r0: 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 kx:h 6 itbvwdhbby)/ bm ;y.;n.inetic energy. Do not ignore air resistance. How much gravitational potential energy did theb;hn)h /;i x..ybdb:vt6ymwb 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 loses 30 J of gravitatl7*,n xcpi(yn ional potential energy. Do not ignore air resistance. 7 lnnxc(yip, *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 conser z-yz,y4 dal/fp2 w1oevation 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 ist4 xj- 3)/jqwk5bersl

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI unitn +)ntw gqw3:hs?

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 y1 vfhdw (ov6bcav0-t2f 8w5pnot a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 time)h+wdf cme82js the work in one-third the time. To do so,m8 2+fe)wc jhd your 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, thafyudjy9w ;b/b :.2 zit8a h.*g2+p rjoic f,ee 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 m8ltf 6 ):sdn;/5xzyb7vv qpl k and held there. If the object weighs 90 N, how much workl)sy87x f/kvnp:6 lz;db5tvq was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a cons2l* 2md1zml jrwiw7e3tant velocity of 0.50 m/s. What is the 2e7*irm1llw3 j 2 dmwzwork 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 Nuhctk az5d)tz7(i+a 4 for a distance o4 h+c7aa dti(k) zut5zf 50.0 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 is pulled upoxq(+):c- 6obwdj ayz ward with a constant force of 5500 N for a distance of 50.0 m. What is the workazdq jx o(o6) -wb:+yc 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 pulled4; o0zvfn 1zie*o(;4 yjqefm e upward with a constant force of 5500 N for a distance of 50.0 m. What is the ne40(y4 *fv i1; zf; oqejmzoenet 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 alo65b604r jomnye+rdw dng 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 downm4z(z (qpk) t6p ;z(hszdmu a0 a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume no fchp 4r y86jds2;uh e,d0p-qyuriction)y 40h6e8ydpsd p;,- uj2 uqcrh, 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 directi0 -ir jba.t/ifk*es8leol4 s4on of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mi4bs*lk.e fae/- s8rltoj 0 4ioves 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 d u* 0,.0 xxajlpcw0,aejfcv-airection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object x0p .jx0w*ea cv-,lj,0fcaa umoves 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 dirie7l7.f1x ziu 4d8y3zw8dnv q n+r7cnection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obc7.el88izx fur1nwn+ 4 3 idyzqd7 v7nject 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 grartsm5.b z 5jx.ph in Fig. 6-1 shows the force versus the object's position. Find the wjmb t.x5r5.z sork done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is z7qkuvg+( * s;6;qlmzy3tg po applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the finaqzpsog*mkz763 ytu+ vg;(;l ql 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 m(p eio(i1q j q84:wxns( aefa-ove a 55-kg cart (initially at rest) across a 10 m level surface. What(an(ajo1si: -eefq(q i wx8p4 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 wi(thr zri 6 ,(:bed-ht3vu0euz th a speed of 5.0 m/s. How much work is required to stop the mr hu(6z tr:b-,tvd e0e(i3uhzass?

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 initiall yo:.d:uha 7c *ut/pnxy moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same cond:. au*dun7h/ :xcptoyition?

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 cocked by exerting a fora-/a ysekx f5lf5 3;sfce of 20 N over a 5-faf 5a/yf lk3sx s;edistance 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 horizontal09q sf :6whqya 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 rest, and moves 2.0 m horizontally aloq 9h0ayf s6q:wng 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 int0 bcv+-a(lpstd- sew9o a bale of hay, striking the hay with a velocity of 60 m/ 90bw+(laesdtsp-c v-s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m0 oqjkcw70)rq above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential energ7wrk)q0 cj0 qoy?

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 isdmhy0zq 5dkl3i);+z imt o8q; 4.0 m long and rises 2.0 m. If the plan o;qy0iqi3;dkmlh +mz)dt 58ze 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 to stretch 2.0 cm. What i +;cfhn;0jv w*rg:oe3p bp8bps the spring consjb+ f3op; b ;ng8r0p: *vechpwtant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. Ho e t-m jjyb8-)m /ot+u6tsgo,lw much potential energy does it store, when stretched by 1u bjt8je -tols +)m o6-gy,t/m.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 uncompressed sprs7fh3 c/cyq- bing with a spring constant of 25q b7s/cf cyh-3 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 t;,out k,6vxkio stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at xku,ox i ;6k,vt = 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 conyq/b7qv5(4tii4b n2 l: md or4f i;qbfstant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additi f5 tibfn/:4 lqmq7bib;d4yi q 4r2vo(onal 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 startst1 afyiy t15t wxt m++v;g-svy3q+,tf from rest from the top of a 50-m high slope. What is the speed of t ytf ,xayv ttv1iq+ ft+-5yw3tg;1s m+he 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 of aaagp6mm8 g1 x9 hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be movinp m19gx6 am8agg 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, itf-q4. vgrp-hr has a speed ofrg-.v -4p qfrh 9.80 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, wc,7u: tocbtr7p01myits potential energy exactly equals its kinetic energy. How fast is ctcu :7b m7, yp0to1rwit 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,p hlk6yqyxa/5+p2sn3fc 1 g3g blasts straight 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. Tcsh/ aqyx533l6 +p1pgy fkn 2go what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic energy of 220 J. At+mtj.eha3 f8w the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did i h ta8+fw3.mjet rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom of a dip (Seelfai+g29rdnkw5a8ute( - 4 +vejfz 2j Fig. 6-2). Neglect friction,(j td ugf2ek5 -98+rna+afvi2e lw 4zj what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the botto/ry9e w-gu1ot+ t ke6tm 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 +-u1 rge oyt9t/k 6twethe 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 thka + kb0h6bjei* r n.c1 ,qp(zzexw6efgk7. s1e bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what wil briq(0.*xe6cjz+pkz1hw1n e g.se6kaf,k7bl 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 at the ,f 6bdz ;ga;1uhuge7g 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 thn4s nn9i4/ll9 8x xbpvt)c( (jez;4pwclna+z e vertical axis and released from rest. What will be its speed at the bottowep i(4/ t lnja lp(;+9n4 c8s)xc vxnlznbz49m 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 aspr6 -:lzoz p7 qog:sx4 akm08n initially uncompressed horizontal spring with spring c:0rao p lmg:po ss -6k74zx8qzonstant 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 a red ligbdklx1g;z i; 0ht. What work is done by the frxz idglk; b1;0iction 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 qhc8kd8m2b8kff3i3.u, y4 gg9 newyc a 60.0-kg object and a horizontal surface is 50.0 N. If the initial spe8df83 k my ,ckcfn g48y3h.w9guib 2qeed 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.y yq.+6 mx;z/ul9i: zhqujg a, level surface. It has 24 J of kinetic energy. The frictioqgyqz/h9 m6ay:izju x+;.u l.n 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 applied hor y es,/;gb. t 1dikj,uv9uy7mnizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what iu/,dye.9 v;bky nts,1m7 ijugs 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 slope. If the wopi*--lxna(6f/pwa nsxn *s* wwc4(ww rk done by friction *wfxw(s spa n nw*a4-(x /-w*p clin6wis $-6.0 \times 10^{3} \; J$, 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 is bl1cq: 7q9 c r,ola+k+rlaye arv4*:m 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of*a+79ec:a4 vkbrq, lq+:oall 1rcym r 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 inclin/ z:xyv0 xvu40 o(afba .ryf(ded at 20e above horizontal. The coefficient of kinetic friction between the mass and the planevbz(: yyd4fuaa0vx( x rf./0o 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 dr dnvi zi 42d.5to:nsu3opped from a height of 10.0 m, and strikes the ground with a velocity nivnu d3zo:4 2s ti.5dof 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 of staig4+t (j pf2lgbrs 10fgt (pblj2+4g.0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a oaedby -z6.ng)m3)io1h; yhs constant velocity of 5.0 m/s. What power must be delivered to to ah)- m ise6yby3zg1nd;).hohe 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 hwz8 ppqlaw )*v 0n//tz 48ksozp motor that runs for 1.0 hr? (1 hp = wzq*w/s4k 8 alo0vzpz p8/)nt 746 W)

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while d9dmi2:sh g( 1 gupyvaq9xp bd*8t-9eriding. How much force does her foot pepg9x 9u t2i 1aqg(bshd *8my9 dv-dp:ush 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+/puwwiwx1 qaj1lm-0/z9 kbju65 jub to 25 m/s in 7.0 s. What is the average power u-awjwq l 0p zb5ujb1i /k6u+19/jmxwdelivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95