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

1#

What is the correct unit of work expressed in SI unit b -m55 hlfiau+(-p4ut(zzg bqs?

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 tht)d ;kkhbr,u,ere 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 againd*mz1 n4r k-sast a stationary brick wall, the amount of work you dnr* -a4 ksmzd1o

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.a +hp,0 h* qa)stkvu vn2+0vwutyl61w0 m vertically and is being held there. How much work is being done in holding the box in thqln0tv6 at 0u vhvp,u 1w +sahwk2)+y*is 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 ugu, ;je1y7.j(p .ktw5zqfa aconstant velocity carrying a 10-N object, tjq7ezg.au yu a f5.,t;k(wj1phe 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 verticcfcwj vl.k; *c)i n/clw +52xmally 3.0 m then returned to its original position. If the total weightc5 +/ vj fw)2cw*kc.lcn;lixm 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 for yt6bb9t5uurvgx l/*+ ce acting on an object 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 straigk -vof n3ml1ccq27yz :ht up. 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 goes down l-7ycm:no321qzvc f k.

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 curvefz iev) z81 q35ox8k9-wqu ber, on a Force versus position (F vs. x) graph, represents i1uwzq5 xqv)zek-89e 3f8bor

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the work dok (j;)jwtcen- .y re:ine by tj.:ri-j;y cn kte() ewhe 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 positive, then the object's kinetic e-og ozjk+)gz: nergy

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 kinetirlz*l7.n8; 6z p i54 cebtam*ct(x nppc energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kinetic im 87w) 2tbweha qg(n8energy

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: a. ctmm+qs)31 3 xzf l.4ptsgreyl/j much as a car, and is moving at twice the speed of the car. Which statement is true )lts 3sm4m.lq3./pzc:jg1x ret af +yabout 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 has half the mass of y )vcqn6f6f -mu,jy *fcar K. The kinetic energy oqvyfyj)- 6 *,fumc 6fnf car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with halt4a7uxf8av3 6c td 6xyf of its original speed. What is the rati v a 6uf3ct76yx4xa8dto of 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 an,ih ( 6c6cqe;s7lwp7 pxdkehx0 iz8l.d a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the e7.i7epki,h6ls (h;d0ql pxx 8 w czc6rock'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 wid+k oub4y1u5yt6 ldmx(gwa vr +a7p.0th speed 4.0 m/s. Both objects encounter the same constant br+ tvdg+aauy xuop1dk.r6 0 b5wm74ly (aking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes rtlox3 q:;popv* 8ism g8r4i( of your car in a panic, and skid a certain distance on a straight, level road. If you had been travelint *4p3 :grvi lx q;o8p8(rimsog twice as fast, what distance would 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 an elliptical orbiq8(hh(j xqzl(3 :(eat8ew i xit. Neglecting any friction effects, what ha((l ie 3:qxxh (i8hjtwze( 8qappens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principl prbcdv d401 gc0 wo)/7xoq)eve.

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?5/x .f3grlc- 5ee xvbn

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 (*ls z)qn* iwaheight h above the ground. A second object with four times the mass of the first if released ) wnz *a(lisq*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 topdic*o,h q(haw* cf0k5)6hcc the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the sp6dcpcqa,hc0h(f 5)* i k*c hworing, 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 et8.ij5 jt hfc-nergy 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 zpo )aq15dd)9yh vcp1a tree. Compare its kinetic energy K, to its potential energcy1v1)h5zpo9qa dpd)y U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car dre)itd f2c/p .w2t o.yviving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding wimrz)mx /olp7:th equal speeds along a level frictionless surface. They both slide up the same frictionless hil7o :mprx/mz)ll. 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 /zapb;qa.85h -lw rc f$m_{1}$ 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 conservation of mechanical energy for conserulnkcg qeg*yk :oz36 ,wx5hd43jjv: 2vative forcesuqh3 gcw6::k n d,2zy4xj*5vlj egko 3.

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 +(p :jrcetinc sqj4/oma : .r0(air friction is present), to the ground below. How does the r/.(psm40oji :qta :ce+ncj rkinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic ener 8 17u4o/qty4q0wd u-t vkesiggy. Do not ignore air resistance. How much gravitational potential energy did the ball los wq 10-7t4s4t qui/gvy 8doueke?

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 5w5w y9ujb v4-dpvl n:gravitational potential energy. Do not ignore air resistance. How much kinetic4 :pw n5-5vuvl wbyjd9 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 conservatiohy 34bl7 o oco/uve8+rv :0*3ezjcmw twj9g3 ln 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 isjo2.i f ,;j4mkzx cu sqnd)fr+;40izj

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 ezv njp(m xz6f(.-. fjfxpressed 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 unituk, kx1xoz 1bku1xvh6 mf).u* 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 times the work in oxtp /,y,( y pj ag*tzd0:wdb6one-third the time. To do so, your power ou dy optzgw6bjpty ax,:d(,0* /tput 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 acc;jy zdeoos +le2fy ;9/r hui+.eleration, 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 object weighs 9,mm,d ;su*- y 2fixrel0 N, how much work was done in liftim,xl iuye-,fds*m r2; ng 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 d gc-/8g 0lbxlsistance of 1.0 m, at a constant velocity ofs0l-xcg bl8/ g 0.50 m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled g * ns/g pe.3tbvyjgy0n 1f*ht+c*4naupward with a constant force of 5500 N for a distance of 50.ac t 1y*v*hy g*n.n4fpe+/ 30gtsjnbg0 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 upward with a constant forcenk4fl*fx *:jtmc4.*vs1uhikh; x w/u of 5500 N for a distanc;f 1j/i tw x4s.*mu:kvl hu*n*4hf ckxe of 50.0 m. What is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 ww( o sbkw/:k4uq /.ujm 6j2k/sujaz4N for a distance of 50.0 m. What is the net work done on the elevas46ukua/bj(4q / msjw2kw ojz: /k. wutor?

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 mbi600wrnbtqzq6c.w* 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, inclineu-r78*c (xdr *gvsp ord 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 k ,)4z 2lkmem/ixwgr:sister Sarah in a sled on an icy surface (assume no friction), with a foz/)e,gr4kxm:w2kl imrce of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The grax*e4h t(o8wju +7vt i hku-n+qph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movew8 7e4 hu it-nkj( +huqv+t*xos 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 theu dqh(w.izjk6/e+h ,uhrl+ /p force. The graph in Fig. 6-1 shows the forj,l( +wudu+ pzke rqhh//6 hi.ce 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 directityyaafegz,/m- 8x n.(on of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done wh-,g zf8ta y m.(yexan/en the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph 7l:,2f wusdzwin Fig. 6-1 shows the force versus the object's position. Find the work done wlu wsw 2f:z7,dhen 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 applied1sh/x nr.pv hq,io i29ftp+k 1 to move a 55-kg cart (initially at rest) acrossr9 o v1k.h2xsq,+ti/1p p inhf a 10 m level surface. What is the final kinetic energy of the cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially ac*n: tcf6: ,/dojqiyft rest) ac*6:,/yfoqjcf: i cndtross 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 r ks( u+bs)*abocz(6bwork is required to stop the b(abb )u c*s6skr(o +zmass?

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 ini 46lpegjmt 5/k 9f4+bng+eg setially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same conditio46p4g/mtl9 fen+kjeg sg+5 ben?

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 g0jvj5.zc boc6g - ))crbss.u8q 2fefzun propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speedc)sro).0- cq zf2euzcf v6jbjbsg .85 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 hor5rz +niqa* 7zdizontal 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. zn7a5 irq+z *dThe cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g i ;wq:4k p2ar 8sog yfjas0d.v6s shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm;oa fap0q28ks4.g:sjw vy 6rd 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 m above a floor to a height oh b bqjt242q e6*22gk ozsl/aomw+p956mtmxs f 13.0 m above the flooro2bq2 m64qslz2 g/mkwj2bp o aem*sxt6h t95+. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane.da .e le44rdjnkz2c 4kol8/)t The plane is 4.0 m long and rises 2.0 m. If the plane is frictior.d4 ee42o4lt/nl8dkkja z )cnless, 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 sprio-l9n(w*doxklh8h+x ng to stretch 2.0 cm. What is the spring constanthwlldh*-x n89o x +(ok?

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 bsfj g gnqxr m1)vl2 ckp*30h *a/,,xymuch potential energy does it stor*0/gax r l3 2)pf*,sybmkhc, jvnq g1xe, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work requ f/b8ev 7gsv/wired to compress an initially uncompressed spring with a spring const gvbesv /7/f8want 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 N/m from x qh dosw8sus (vv /;e)cz;:mtq.siu/*xh9 7 tt= 0.20 m to 0.25 m? (Assume t di;tsho.)8e csm;thzsuv :qv swqxu7 (* 9/t/he unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 g/8uvzf6) han rof f0pd2.1yzcm. How1za.rngu f)/ pvo28yh6 zdff0 much work is required to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-mrdmzo )tx06e/gj;,o xt w3g.y wx.2dr high slope. What is the speed of the skier on reaching trdj.et ;ot/g02.oxwxy63)w,rx mgd z he 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 tpb (1fcbe g3(wyi 1gg6 prk(j(w ql+c0op of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevatiowg 1j 0cp6bl+f((iwpybq ecg3k 1(g r(n?

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:ol k2q f..jkba:n0 rzosth55 inclined plane. At the bottom, it has a speed of 9.80 ts5r ooa k2kf j5:0zl n.h:.qbm/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,)h5: 1ws kmzpy97ipj j its potential energy exactl y zp7ps w)ik9j5m1:hjy equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from grw5tco+ a9, noomh o;a17skb4dound level with a kinetic energy of 40 J. At the exact top of as7 k ,dwcntoo;h 9ob1a4+mo 5its 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 b dol6,8 f,ux xorm;n/yr,2 5kdutiy 7ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic2;m5 b ,8o td,ni/ofxy7u xdylrkur,6 energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a poiniurhy6ykm9hl 7z79wo cyxo:0:vjc w;i:;vl (t 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 thyc7 w( h9;lmv7k:lv 9 x0yorii;cwjo6yhu z::e 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 ml1 hlw)n9a vm vrl*7c1 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 next9rllmvn v 71c)1l*wha 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 t70(yz i.q jakl fwjwtl5 7a,.ahe bottom of a dip with a speed o7a7tjk(l,5iay aj0zw .q fw .lf 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 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 (pointcx.n m9yu6+in

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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 0.13 m away from the v 8j9 bsok/cntk nx9/e0w+0 u n,+naivt+xa(rvertical axis and released from rest. What will be its speed at the bottom ovk0w bct0k /v a r (xosnx,ita+n99nuj+e/n+ 8f its swing?

A. 0.1742 m/s

B. 0.464 m/s

C. 0.697 m/s

D. 0.581 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 uncof/s4yqn5 33 q.rau zpmmpressed horizontal spring with spr qy53s rz.pf4mu/na 3qing constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22dyo l2.98qilf5a up1s m/s, slows down her 2000 kg car to stop for a red light. 9 8. d f2pyauolq5l1is 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 object and a horizot+)yw*ztk tr(9xq 2- a ncdcn2 :dvix9ntal surface is 50.0 N. If the initial speed of the object is 25.9k+ aztw qrc-:2 ( y9xt*n)tdn2xdciv0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has u vm*;.m+6vhtm-r vr p2yci4 c1uwvq/24 J of kinetic energy. The friction force on it2vvm1v;-uw/mr.4 u 6hcp*+cv qtyir m 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 to a 2.0-kg ma(f4 i6 vpo4hvx *odc-ass on a level surface. The coefficient of kinetd p 4vo-io*axc64fh(vic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-nlg1 cg4bq+*vm high slope. If the work done by friction1gnglcv4*+q b is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane ty 8xf-vcrg-zq;l8f(z tp3 i* is 4.0 m long and rises 2.0 m. It requires 32tz q8xpr-tivf;- cf *g(y3lz800 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclin:wd-dt qk r/tjo ;55nued at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass afte tu/n5j;d k-tdwr q:5or sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes :z go,*toqd;mthe ground with a veloc*:gt,;zqdom o ity of 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 runslsx8y5,lqf y 0 up a flight of stairs 10.0-m hig8f,ls50xyq ylh, 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 o r9uz;xokes rqr+ g881bject with a constant velocity of 5.0 m/s. What po8;rsz rxk1e8qug r9 +ower 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 a k6lkzb*yr30jre used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 3rl ykjb*zk06 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 riding. How much force does h2 )kmnhq/a :iqer foot kiqq 2ahnm:/)push with when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the averagea2j 2e /swfz:o power delivered byjfs2 :/owe a2z the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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