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

1#

What is the correct unai /5 :1u i9zmv;pxgh(ouk28:czd uirit 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 system if there is no mojb.v 1-rkn :9o25x2uwtyqq pption?

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 ad7r mbu +m0/,qnne06c.le kxof work you denaem/ur+7b6n0 q,xm0.lkcd 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 21rd :8 vr;atxnv5vxgst -j7/t .0 m vertically and is being held there. How much work is being done in holding the box: rs-/vxj5ra1v tt8d7; x nvgt 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 constans:dz6ilw 1si)zgi3h -t velocity carrying a 10-N object, the amount of work you gwlz) zisi-ih1s3d 6: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 then req 4b :icdj usk2i1o39iturned to its original position. If the total we s94cudkq3ioii1 :b 2jight 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 objecte9 tgb-l8ss .u?

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.1);ibr gfcvp2t pw2 d. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goer.w db;g)22p 1fpict vs 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 Foe1wr :vn: wc;fm(uph *rce versus position (F vs. x) graph, representsmu:crh(e wf1p v:*n;w

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 reprj 5tj5hw ,q p0zy3tl4vesents the work done by the forch , pvjzl3w q4yj5t0t5e F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; mv^2$ is

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then t ,xrn/ rk a7g sjfkfss2 h-40jlhm;..ohe 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 onqyi6rq:a gnpz u1;0b4 an object is negative, then 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 doneg f9it:g8uxfc l)pr 9gh k00c5 on an object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is m o wu iwgq*dg69(yyb, k- h3ef)ouq:8noving at twice the speed of the car. Which statemenf9eoh-y:3nyb6quw),*uk wgio q8( dgt is true 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, and car J l n.hyq s0v;vy6t7h n:has half the mass of car K. The kinetic energy of carqv tvy sn;ly6hn.70:h J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its orig wo1.mfif b z41jj6u7yinal speed. What is the ratio of the final kinetic energy to tfj4wj u7bi .zo1fm1y6he 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 sph2uc(,gi 5 )dioqq .xqeed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kq qho52 x u(g)dici.q,inetic 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 speedv/y ,c9e ait9aghba2d59fe6 u 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and ay,u afiae /5cd96btg9hev92are 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 distancr ihd4x,gev2szu8eem4*v y5.q eqo 4,v+1vjfe on a straight, level road. If you had been traveling twice as fast, what distance x5d4e*j+zr,meqvu4y 1 v. , foh4eqgv28v ieswould the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in anyou b.uuev50 cph wc-4lw;) b: elliptical orbit. Neglecting any friction effects, what hap )0wb;b-: evlc yh u4.wu5cuoppens 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-energye,m 1a,6qgcv/b /z pt5xp; izg principle.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; kx^2$ is

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to ha.zp-emp x )usw8:qb40eiw* hvve negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the grojs. z .kl+/yxaund. A second object withlz. .ykj/axs+ four times 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 th;p/ vgk4iq07gg* tfxhe end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added t 0pvq t fx*i7/g4hg;gko 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 enerv;8mcuhys ) s. 1l/-hwu6z dwggy 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, 0 rl5wvo.;oyc1 s0su bgy7m: eto its potential energyr10byv7s0; o5msu:e cly.gwo 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 hillgp, sm.d8d 7eo6p ;j)z.hcbft.

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 verp40// - ; ai sfu+mg/tgxs; gkrpm ojt)6jy*gxy heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the samyr;u/g/6f/jgxks 4t p 0gmx p; t*is+jam-g)oe 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 mjl+*bp0e;- jbhkjg+ $m_{1}$ 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 conservq1.jnmyt7sd- ation of mechanical energy for conservative forces1tsydmj7 q- .n.

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 buildin9 xa*ihus xa)7y-rw9uhgsj)ci 5 7j/xg, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the build jxrgi) xacs9 /-a7*)5 xusywjh7hi9uing?

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 f06xp;z.ccgz ;qeax0 energy. Do not ignore air resistance. How much gravitational potential energy did the cz cx.x; f0ap zqeg0;6ball 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 14lw t bj(/ 7e.xuzphigravitational potential energy. Do no 4b7xetju1lh/ zip.(w t ignore air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of consewb*+e 3m+ .l6x vfdktle(v.md8 eshf 6rvation 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 isd xifwvo, /1q,

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 43- wjep2: rqmeo5t)r0rigs funit of power 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, whichoytn;x 8oz;vquh +2u. is not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did q mdbwyoyei 0sbt*oq,;n. q529++ dwj3 times the work in one-third the time. To do so, youy*q j0qd95ei.stq m+wdo;nyb+,b wo2r 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 itd2 ,f-wr( joa constant acceleration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. Ifxdlvrs , :/ 0zjz*wny+ the object weighs 90 N, how much work was done in lifting iw0 xvs+: jzrd/znl*y,t?

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 di7m/ui +gmgoz,stance of 1.0 m, at a constant velocity o7gzgu,mio/+ m f 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 pullesay y+00 .yjcq81aro,ggc*du d upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by .8ray*uy y+01saqjgc0 d cg,othe 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 upward with a constant force of 550l3ja,0 s 6ujg5qysxb/ 0 N for a distance of 50.0 m. W3sy /lj g0x6 5aqbjsu,hat is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a *w;q3*g z,hab 6c4s-ehovg am distance of 50hv a;*b, 6z -3coqeg g*smha4w.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 6.0sp+ fy) jezq47 m up 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 8.0 m down a ramp,ws(03be:vr pr 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 Sara 7ijycfr7 ,*q m61czs nayh4bg4d.mp :h in a sled on an icy surface (assume no fricti47 gjcri6p ymh1by ,7 mcn4 z.qsf*d:aon), 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. -r1lcd mk .vkmf ao;0-The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object ar-lv -cod;k.0 f1mkm 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 thg84.i7nu-lu y2 mmi0uyut g0ddp+ib - e force. The graph in Fig. 6-1 shows the f0pmyuiu-g0 udn.d4l8y i -+2mbiugt7 orce versus the object's position. 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 tui( -cway oqre/3 c(,phe force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves f/,rypieq( cw(uo-ac3 rom 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 gne(; .mume3 fu pf:b3direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mog3;enmp3 mu ff:bue(. ves 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-ke/u, l 8nz-ubm,)svkk9k8wh ig cart (initially at rest) across a 10 m level surface. What is the final kinetic ewzn, ik)u-8kbsevh 8mk , 9/ulnergy 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 (initially at 0hp0kxpgdxib mdf3xi5, 8 d57 rest) acr k 0b df50idm7i x,g3dhx85pxposs a 10 m level surface. 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. How much work is required to srg8/ag:o6uk zanh0 w, top the mass?0gzgn:o86aa ,/khw ur

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 r7(.: lx7oqod9rrtnm , what distance is require7 xdlr9m7r ort( .n:oqd to stop 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 co wpqx zl1kda*vk 2lo -x6/g0m:j79 agycked by exerting a force of 20 N over a dkd 0q:z yg21 g xaam*67lk9p-j/wxlvo istance 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 khk dnu cs9)lq:hz m4s).g.z594y04fcaf hpqa 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 along the floor. What is s0kzp)a:5.n.h4 ufk)q9hlshmz q 494gf y ccd 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 horig gcc/*ff(s o2zontally into a bale of hay, striking the hay with a velocity of 60 m/2 gsc *cf(/ofgs. 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 heigyak c .ilm,w)um.0xp)kf,is;u,m h 9aht of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational pot;p )u)sfily ,hm,c9xmaik0aw.ukm,. ential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long and risesudn:9sbyl i z5-r-iz 3 2.0 m. If the plane is frictionl lyurn-zb9dis5:z -i3ess, 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. lerng 13gq7*jra* :a( quw3 ,rfiob7bWhat is the spring cobbaj*o3l3r ,1 rq g( fi: 7rn*wq7ugaenstant?

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 constw f1rp086ru /ri f xly8he45stant of 60 N/m. How much potential energy does it store, when stretch5yw4 rru81 ex/ilf 6r0tpf 8hsed 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 uncompressed spri b0y.ksf4db:d1*aui qe1a ov- ng with a spring constkouv0bsfb e: yi4.a1-dq a1d* ant 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 stretch a spring ofjr-i,pk) w 8 0bzvav 9eoxe17y spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched prebxe7vik 10)8w-zpo9,jy avosition is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 cqq+8e3yf /w7l dd17n pstpu1ym. How much work is required to compress the tp suy7y/1w qplf3dn+e8d7q1 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 f og*hpkz.j.e+b/7 u6kjkfcd.rom the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect friction.)dk.hu67*g/+eo p..c kzbjfk j

A. 22 m/s

B. 31 m/s

C. 9.8 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 a hill wil0 ff;rkk..kz th an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving aftefkkk0f. .; lzrr 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 inp1e *giv6n)eq 4*flq92yp( 7yn annedclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical heigh pi*ly*envg (n )94e 1 7a2qfn6enpydqt 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 abog12 g3 ptkz eezi;5rdmnwgw83 la :88sve the floor, its potential energy exactly equals its kinetic erga p2ksew t138g5dwmnil3 z8:z;ge8nergy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground levell7*/ y ff(biy.el edu+ with a kinetic energy of 40 J. At the exact ifyf7b/e* u.+y (dl letop of its trajectory, 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 leaves the ground with a kinetic energy6 x22dslj c-yqjjr.7p of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what verticarly jj62d7jxq2s pc-. l 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 aboveysf3 oh(6z21zscv8 bw ;yha; h 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 the6sh;vw 8z2 ;1y (3obahschfyz 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 stap,r (9emkn2yo g t,nd6/naw5m rts with a speed of 5.0 m/s 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 thy,9mn/ke aw2gp6rd , (n5tmone 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 dip +)b( ei/i rpdqwith a speed of 25 m/s (See Fig. 6-2). Neglect fricter+/p ( iiqd)bion, 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 at the bottom of its swing (poinotpw7v0elst5 4 pa 47at

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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 pendulum of length 50 cm is pulled 30 cd.v5n tl 38ricm away from the vertical axis and released from rest. What will be its sp3i8lrd5ct. vn eed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 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 unc/d/cm5vwjx i )ompressed horizontal spring with spring constant of imdv /xj5/ wc)$2.0 \times 10^6 \; N/m$. 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 liaqqjul9+ 0sl+o7eiu t5 oy) .oght.ouia.07l+5q) 9 tyu+qeso j ol What work 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 ob/eommyf14 a 56ool8q dject and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before cofy 14 lmo68aodq/5oemming 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, levela-z:u-y;j6aomrr di( jla/ :r surface. It has 24 J of kinetic energy. The friction force on it is a constant 0rua6rdr/ ojm yal-:ia :j( z-;.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 horizontyyk8w0sw2bn1w a;hj3o jz ;. vm 3;setally 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 d38s;hn w;ej;sva3m1yb jo .z y2wk0wtistance 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 slope. If the work cq9 c56mjwg2f5 d50nec d zv;ndone by friction5zwcd5vjne;0f g5 dqcc 2 96mn is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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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 planeqb pw;uis jpj u2mlzt,)ru0/qy .k t+-4 )se)m. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the q ps.zuq+,j)utjmkeusw4 lrtpb)m20; y/-i) 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 inclineig2tgri (( ;z :jinh cws+;2end at 20e above horizontal. The coefficient of kinetic friction between the mii (c;g: e2+njs i2rh(n wtzg;ass 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 droppeyqtpp +r o*0et3;b mv4d from a height of 10.0 m, and strikes the ground with a velocity of 70vyt*; qb pm4eor+3pt .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 v8d(jhnb z+yl(i:q 4v when he runs up a flight of stairs 10.0-m hii(8v4v( :ndbqhlz+ y jgh, 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,/ivcwui f8p8 with a constant velocity of 5.0 m/s. What power must be delivered to the object by the force?,wc 8fiu/8v pi

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 that runs for 1.0 hr? :a 06scci n*gh(1 hp = 746 Wi *nc:6a0 csgh)

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 riding. kr1:) 3tpqflj2hufzevq8 fv-:0 jwf5 How much force does her foot push with when she is travelinpu j:j f5v-qez t8v1 f3:wql0r)fk2hfg 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 1u x9tmv5y h z0dywa6r -/qy)f0 to 25 m/s in 7.0 s. What is the average power delivf)-9 05dt hm/ya 1yrvzy6 wxquered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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