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

1#

What is the correct unibi-njxfn3 g+ e+2o+ ptt 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 m bdz1 jmf-. .4kst;jvtxb g.5a 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 of worz 7fxl,3r uex1k you 7erzx3f ux,l 1do

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 v1 9-0i1p(;aexnjdtcs0 wggq and is being held there. How much work is being done in holding the xp d1ng00 w(c1g ie- q;aj9svtbox 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 cons v ehz-v3a w:jowbwqs)x: 4k(4tant velocity carrying a 10-N object, the amount of work you do is eww:-ojxk(:h)b3qvz4w s v4a

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 thyvit ,d:*.cbz en returned to its original position. If the total weight is 30 N, how m:d. v,ytzi* bcuch 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 ob7dsa w(8r vt/xject do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the 5y .vgzfuh6z-sign of the work done by gravity while the ball goes up with the sign of the work done by gravity whiy-uhvzf65 g z.le it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) gralqpo;n69je5 kpi:jb1 ph, representsj1lb pj6pi;:nekq 9o5

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 ver0sw y s7wm, w*f90ppzusus position (F vs. x), what represents the work done by t*p9f0,wwsmp0 7 us zwyhe force 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 posid u2 ;6r0maerttive, 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 objectc6)d+pq( ssf w'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 n4t*9w 9h0d (igdbcxh 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 moving at twij6cf 0f *ek mt+v6yd oub,*/ ;jtv+ijv o)zrc(ce the speed of the car. Which statement is true about the truck's k6,)c f+ovvd+*j*ko ev 0jfj(m6 zcib/utrty;inetic 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 u46p)goxtrr1rf ;:m6tkys3 h has half the mass of car K. The kinetic energy of car J, compared to car K it6s 34u6kh myrr;t)1rx po g:fs

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 tp ttq+2w4, l;snsu)zand bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy)p z2 snlutsq+4, tt;w?

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 8(,tgfcxz3fc/ aqrb8speed of 5 m/s. If both objects have the same kinetic energy, what is the,cx8fg (3 ta qzb8cf/r 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 with/4b7dmn(xs q z speed 4.0 m/s. Both objects encounter the same constant braking forc q n/z7(sdx4mbe, 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 distance on i( fn/7eo* gpda straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same condi/no *7gp(fdei 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 orbits the Sun in a8f 8mj:nqmp.f n elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetpn8 qfm:f.8j mic 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 principl.:oaf9 e kw*aie.

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 poqi5/z)ef /d tbtential 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: thgjd3e5cf*du z z70 a height h above the ground. A second object with four times the mass of the firzgczhd:d5f3 * 0u jet7st 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 obcj .rmccj/89ovg25- tkyb 4j f a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring wilr58j9kvbbj c-tjgcoc. m4 2y/l 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 ofkky-:wtq( lu 4 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 i azhw5ze-bwk -h.0c75kx uq g w-3b6iwts kinetic energy K, to its potential ener5hz7 0iaw w-bz 6 u-k.wgqc3h-k xbwe5gy 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 a0qf+6f(42f.cay 5igwxw d ygr car driving 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 :e8x5il d kf0xsliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to i f8k5dl:xxe0 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 m+.bksj* rj4 u+svu q0$m_{1}$ 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 coc nbrz2 qk csh9159mc.nservation of mechanical energy for conservative forces c n9c5k1r mcqz.sh29b.

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 kxgqf,wuhk::f d q.;+ is present), to the ground below. How does the kinetic eng+ f,.qkd::x wukfq;h ergy (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 ignore a3ugs*kw6i)*fu hqa* u r+k5 wpir resistance. How much gravitationalkgq pr*f)i k*s6 3uhwa5 *+uuw potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gn,a,7tzm n4 xkl 19 csrabz 0*og2,v-ib3uaghravitational potential energy. Do not ignore air resistance. How 2g3 aamzu-b binc a n0s ,4,*9rxz,klo1vh7gtmuch 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 )ec;xm(*a(dxizl 1*sj uyv 3 r,rk gv(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 ismqfi-9reavz; epk56)

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 powe20ezf8vpy . ztr 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 unit of t1mly14vfgmg n,o5rs -hdxpig, 3(b 4power?

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 tvit*ru8mm/pari9 9) g)(p aszimes the work in one-third the time. To do so,p*s9rgau/atr(9ivmi) )p8m z 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 aw mz f9cu*+g2ej/ac,dx fij19 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. If the obje;da +w)mb;, vbxiz+7bn7u jhb ct weighs 90 N, howz;bd )un b i;w xb7+v7bhma,j+ much work 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 qv+ wco enkc54w vz753 t wi4e5(-bcdhof 1.0 m, at a constant velocity of 0.50 m/s. What is t7bzq 5wve54c n53co4e+kt -vc(hwwidhe work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 55009gv wlu *dd)13x sruc0 N for a distance of 50.0 m. What is the wo)l c3 s90xurugd1*wdvrk 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 upward with a constant fo- 6il .hboe* bdzo1/ld9ucc1 irce of 5500 N for a distance of 50.0 m. What is the work done by the weight of thc *c.oohi 19bzu1 6ied-dll /be 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- duv:3 19j:qvcic;hxy q6ung 5500 N for a distance of 50.0 m. What is the nch cuxu qi: ;vjd6qg-y:1 vn93et 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 6.0uj naqr x,jg +7 ff.a2jk*on): 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 ayp*:0vik e+8l uu;ez b 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 ngq12d zv,h4w*: xr.i9dljv tz o frictxj,h9v 2t wi.d4dzz:qr* gl v1ion), 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 d.mc1 ggj 8,pyp3-aldthe force. The graph in Fig. 6-1 shows the force versus -j8. y1lp3 , apddmgcgthe object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph -ql 9yprnzx5:h,v-pu v yw,9n in Fig. 6-1 shows the force vernl- 9py x,-,: ypvzr vqnh5wu9sus 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 the force. The graph in Fig. 6-1)+ uu(d x+7a 6 gtzck9la6lxtv shows the force versus the object's position. Find the work donex9ta +u) uxz ktd67l (cva6l+g 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 cj:dfw +om6iyiaecg u58 : ,5+gt1g blthe direction of the force. The graph in Fig. 6-1 shows the force versus the object's positagd1yteg 6:f58b +wlc 5j+im:,c uogiion. Find the work 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 applied to move 9dtyxm4 u w)p/a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energm 9p)/ dyw4txuy 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 movn(k, :fqoan)y0oy jg( e a 55-kg cart (initially at rest) across a 0a ,goq)y(kyn:f n jo(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/u)sg3 t)l8z7 vntv+vp(z4g h:kfwno5 s. How much work is required to stop thepguz 3nlf4:vw + 7ov8s)h v(z5nkgt) t mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stopu fd:udu+: i/ w)-zo p(0z*:rlh ybvoj a car initially moving at 25 m/s, what distance is requirzuo b*:) d(fp+wd0ylvuoj/:: u h-zired 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. t)4m8pkcu*kh It is cocked by exerting a force of 2um* kpk)c4h8t 0 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a hor pot*:l6*zesjo5j0q i izontal 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 horizonjioj:sleo*0p*5q6 tz tally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is su7 6lygbj,i e5: kp9pq7si+tahot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm b,6+75skge itpp9uably7i: j qefore 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 movepcgi94- nv5kmpj0 h3bf 2 nldg 6ldp7:d from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gra5lncm:6 k g 4bhg0v3lp f ni2dppdj97-vitational 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. The plane is 4.xzg gtw*2es 7z0eek d1n(a)m .0 m long and rises 2.0 m. If the plane is frictionless, how much t2zz()*e 7nmgw1sdagk 0xe.ework 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 -ou.fd 2vwcw-a spring, causes the spring to stretch 2.0 cm. What is the spring cocuf-2ow-.vdw nstant?

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. How much arm: gdvy00cg 0av t9.potential energy does it store, when:m c090 dygr0agt.vav stretched by 1.0 cm?

A. $3.0 \times 10^{-3} \; J$

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an inito i4fmh2gj-f :ially uncompressed spring with a sprf jf:-gih4o2m ing constant 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 of spring constant 40 Nt4csdhw5m9a e8 t5 v9h/m from x = 0.20 m to 0.25 m? (Assume the unstretched pov5s5 d aw9hce9hm84ttsition 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 initi5n5i u8fzpjxidu s:4bas 2 e17ally compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 c i 175s 8izsd4xuj2nu paf:5ebm?

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 hbfzp5fj0 8nc/igh slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect frizj 8fn0fb/pc 5ction.)

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 with an initiscjz ;(bjqcpkz0 *(x(al speed of 4.0 m/s. Neglecting friction, how fast will she be movic(cp(;kb sq (z xjj*0zng 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 txqru0 7.fz5 ktw 7i+rthe bottom, it has a speed of 9.80 m/s.xzq ttr+ wir5ku77f.0 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. Whencqzs (w:vm91a *yc)d o4rfmh4 it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. Hoamrv4zd1c *:o 49)q( fmcysw hw 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 straighti5bmgn- iv4j/s -f, xs up from ground level with a kinetic energy of 40 J. At the exac xsg4n/,m-v j5sbi-i ft top 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 energy of ( 8d1r :ml zbhw0q o4l,,fsiyu220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, ,qsuiromyblld1 0,hf z:(84 wrelative 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 osu+s ; hm;:drskz b*jn/b*f2b5g(dnfrom rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the ndz b *b;bhsumonj+srs/:* 2fkn (d5 ;gext 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 i/ mni699ie shyrtk0f28 sy1ji5r -zfspeed 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 the top of the next slope, which is 30 mt /ie59ijkmfn s1sh 8z90ii 6yryf-r2 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 3 6ext+5s aqdc hh5ou*with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 4sao3 d5cx +*hehu65tq5 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 spe) h:9 /orfxc)sl/ko xfed of the ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 c7gs-.ucy*9 :kgpf , y/pbhu1 yzvz+vh m is pulled 30 cm away from the vertical axis and released from rest. What will bf9:1y kug* vph-+.sy,p vc/ zguh7bzy e its speed 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 o95*q +fjpx9ktt63 ltvqm3 n7dmb o4dinitially uncompressed horizontal spring with spring consta4t j*tq+ onk 3v37t6ofd59xdpml9m b qnt 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 kl( mpa1)vt(hp g car to stop for a red light. What work is done by the friction force against apm((pl1t vh)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 60.0dq+rthadrs rsj w/,u v(c1 ,95-kg object 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 coming to au assrh1dvj,t5+ w d/q,r9 cr( 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, leve ls6.x4n ayh*v4)zj fk1 efzx9l surface. It has 24 J of kinetic energy. The f.zk f)1fn4 lzjxsv ye6x94*hariction 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 horizontally()t4ch*pgg *5umgw-g wx j0cg 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 movjxw4w 5- hgt(g *c*p gguc0gm)ed 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 slope. If t*xx)ka ;i n6 hp8s;;ftc9gpg57kojv bhe work done by friction xht pi )8jx*5;o6bc9;a ; f7gg vsnkpkis $-6.0 \times 10^{3} \; J$, 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 otyq79 f4;ig s iij0nerm5u :1plane. 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 boxiqnim: rto5giue41f0 s7j9y ;?

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 fztdo.*fve .p6rom rest at the top of a plane inclined at 20e above hovd. ofep t.z6*rizontal. The coefficient 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 fepfm:am gmb6+ 3-hk :jrom a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average forceg6:afk -mhmme+3j: pb 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 cda)+ 2yqq;9ctnny;g up a flight of stairs 10.0-m high, in;ng +; qctd)nc 9ay2qy
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 de2. thqcx/vvtj1s+5 m/s. What podv /1 2+ecqx.s jtth5vwer must be 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 that run.zc z-7e1m2iyq.z jl2oyjqf21txm .h s for 1.0 hr? (1 hpmt 2.l cz j2o.jiqmfzye1-x7z1yq2h . = 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 ridingq7fwdfi(i5l0.n(hl-dt k yi3hv1 1 jn. How much force does her foot push with when s d -7f5(1(k3w1t iiqv y0nl injfl.hhdhe is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is th,secxh8 *c v xc9nz9/se average power delivered by the engine? (cs9c*/,xcxze h ns98v 1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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