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

1#

What is the correct unit of work expressed in S4;mqeuhdq m :q2m -n0g-wwcs2I 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 moti y semyd xx88( hh2 g5fw+xsl77h3d:uqon?

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 agvkl bu)n hc +83+zjda;ainst a stationary brick wall, the amount of work you k++3 azjn8h);dl vbuc do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is lqlz2goc :y +;being held there. How much work is being done i2z c+gy l;lo:qn holding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forww 83 ;12pw7bukxtdme bard at a constant velocity carrying a 10-N object, the xbekd ; 81m tpu3wb7w2amount of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returnnvg.j*4h6q qq ed to its original position. If the total w6v.qhg4*qjq n eight 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 actinmcn0c(b m;3wx g 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 straight up. Compare the sign of the work done by gravity mb hbwyiruy6l;1*,:z while the ball goes up with the sign of thel*hyimuz;wy :,1rb b6 work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the cp ap/9m,r4) 4k onu6vk8lcqeo-x xv-,w ff8 nlurve, on a Force versus position (F vs. x) graph, representsf9k u,/6wqo 4-f )kpexr cn,l8 n-palv4vox8m

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),/plzn, vh jl 1j;bmjukug vk6967 zt7. what represents the work done by the forgn kb7z1 jmuzvljkl/pv7u6h9t; j,6 .ce 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 onb7j y3f1+qe3ttu,vg g6ip2 sd an object is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's kinpb (zvk vom,;tcp,mpu v/-8;getic 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 )tan/(qyjo p 2j. b1biobject 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 movingai ..jvbo1 tgod8 97(egegu h. at twice the speed of the car. Which statement .ide9v.o1g j aegb u7.og8ht (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 has half the mass of cammvdixq58 r:5 r K. The kinetic energy of crq md :xmi58v5ar 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 boun1te.9;e c* dry og n2u7je.jhjces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic enej2etj 9 7rye.ud*hn; o .gc1jergy?

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 iswfx fb -;m;ej :vcm57q moving at a speed of 5 m/s. If both objects have the same ki-jm q;:v5f7fxew; bmc netic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 gelcn4v-abi 5.bo -2gm/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter theb.2-4ovglaenbi g- 5c same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain distance on a,-v1 phn+uvga straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the samh,vag pn-1+ vue 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 e2: ogm2(3zg1zvt fjdg lliptical orbit. Neglecting any friction effects, what happens to the planet's kinog 2dgf(j 12zgt:v3z metic 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 principbniae8.6h 5 (px 4y zj3euts*c h5s2ox ek*av3le.

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 energ 4ruw.j6hae86 fh kmm2y?

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 r-i(x-jv s( amxest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object ca -vx-x(jmis(ompared 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 attachlnhi8a ;a(cxjq4:cko92- z)wzs ae+med to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potentiali;j -2kncq a:)4el+za o(a8mwzh 9sxc energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a systemgblzi +)9iibys 0 q14b

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, ty4:3h(*y vf o9dd wxi2.eobz to its potential energyf2 (w9hobztxd 3dy. 4io :*evy 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 i6oyg io *l:q 9+nlcyto).h) xa 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 with ev mp);oo-1rigqual speeds along a level frictionless surface. They both slide up the same frictionless hill. Whicmpvioo1 ; )-rgh 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 s4j f5b1e x4acl 4 egc;h:m7ve$m_{1}$ 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 consho uv:(pqd1x/ervation of mechanical energy for conservative forces. x/qu(hop1d :v

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 to)sj6) )(xm jq.qj rdqzp of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) ))( 6qsqq.drjzmxj j) 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 di m //ipwvf;w.p(7 pop;qk1ss cstance and gains 30 J of kinetic energy. Do not ignore air resistance. Howsw (om/pp wp;f1 .qk;7vc/ spi much gravitational 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 gravitationa; mow6ncfv( e8l potential energy. Do not ignore air resistance. How much kinetic energy did the ball;(on vem6 8fwc 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 consv occ5-/t.i 3j,5hhuriss/r r ervation 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 isiahr s *ivq:. 0,bgr/e

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI ufc9jz65)w uyyydi(o (e3 g xa:nits?

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 unitl*w2)4rxd ;htbrn7q l z t:ud* 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 one-th4d xc eo0g0id:ird the time. To do so, your power out 0 0dcogexid4:put 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 cv,mov*tkyrgn1l8e.t*v4 l,bihsl , :ar at a 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 object7ytea; tdoxr6wzbu e2.u 93g)* k4,oo8vyifc weighs 90 N, how much work was done in liftie.*rey3zwfx4o g 62,9)c7 dovt bu8y kt;aioung 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 bookv g jm;gtka-r b764)e(xi7 ,hlm x2apa up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. Whavmk; aag(-x7)ib rjem2glh 46a txp,7t 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 upward with a constant force of 5500 N for a distann(ac8haa qj)8-3lzs u.slaio 2om . /dce of 5 8ha2(sq za/ j3d.llics o muna.-8)ao0.0 m. What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a co:f bmac34oawmetqe.. ez 3h0,nstant force of 5500 N for a distance of 50.0 m. What is the work done by the weighmab3 .m,: ewte qf40c .ezoa3ht 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 ey)ieu )) jj:bdistance of 50.0 m. Wb iuje)))jye: hat is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up alo 1i xy 4l(fcztfgmy5*(ng 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 .a-zw vhftkkc6 h( .td 7:wjl:slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled o8peqry5s 542ahbk1rb n an icy surface (assume no fri rsb ph1 b4q5ary5k8e2ction), 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 ;:ohsl e y5zh7direction of the force. The graph in Fig. 6-1 shows the fosoh;el75 yzh: rce versus the 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 directuyg2lyl 8uhs;wybh( l4427qpion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 toh 2u ;yyu qsp (l82l7lybwh44g 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 0ofic:.m5;3btp qb d(sbaso- of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work donabbo-0(ps ;tsf3m.ocdb:5iq e when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. Thc(7 vz2ebxux,e graph in Fig. 6-1 shows the forcez v e7,(xu2cbx versus the object's position. 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 3mc pimlfh(oat oo 0(0yeiv3;go r.(jhcq.; 5 is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kineticqy;eo3oac5m(c.(o;ivoi(3 hf r lhmt g 0 jp.0 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 ap zldbzqivkns)(+ 3g;v/w4ce/ plied to move a 55-kg cart (initially at rest) across a 10 m level surface. gkn;+ b( c/vzlievq)3w4 d/sz 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 woobj ;3ku44y*x8.emkw.*t/ eykkv oszrk is required to stop themy /*ej kkk y4tu;. bwoz3 8sxe4vok*. 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 stop a car initially moving at 25 m/9 shya*6 9l3s.06asqm bmpulgs, what distance is required to stop a car moving at 50 ss sla6l myp9 gb6h a*3.mq90um/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 cocked by exeebbxg5m*c )e2rting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assumbm 52g*)ecbexing the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical com*ze 7o9quft( xponent of 60 N. The force is applied to a box which rests on a level frictionless floor. T fxzeuotq( 97*he 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 is shot horizontally into a bale of hay, striking gb g * ufmrtly:vj )5x:n7i+-fthe hay with a velocity of 60 m/s. It penlu:yv +5fr:ft )jg gb7xm *ni-etrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above a floor to a 2r m:c3 vhj+d/wpedf2 height of 13.0 m above the floor. w3 2/fmjcr+2:vedpdh 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. The plane is 4.0 m lon7zi5u vmjz,t gd :tc /ho6mf*,g and rises 2.0 m. If the plane* 7c,v,tdzgofu6 :tm/j5 imh z is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. What ip,(xd tsxch .xo/p6h,s the sp.psd/x6 x(ho, tp,xhcring constant?

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

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

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spirv-1v;yhn l-f2 p4fkring constant of 60 N/m. How much potential energy does it store, when strehfrip;y- -1vn v2 fl4ktched 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 spc4 xw13x9lzi pring with a spring constantplxz14i 3wc9x 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 ibb u6eammcvhta 8j j;o. w(201jd38x= 0.20 m to 0.25 m? (Assume the un bw1xv 8ocja0 ead(;8m3b. 6jjti2mhustretched 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 conm dl5g-,.0turuw .tjkstant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the sk mu tgw -j0,..lrutd5pring 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-m e5q0i(9flze p*dmv l1/x)tnn high slope. What is the speed of the slier on reaching the bottilfnvpd9m1 q (x*e5 l/0en )ztom of the slope? (Neglect friction.)

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 inimfd eu*3 31i8v :kiwgrtial speed of 4.0 m/s. Neglecting friction, how fast will she be moving afterv:u mkd*3e3g1iir wf8 dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless inclined plane. At the bottom, it has drlu3 *i0wfn (j7dk ,ia spee,i*dk(d3rf inwu70jl d of 9.80 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, wq-rd4w )t( ihits potential enei(h w w)r-tdq4rgy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground levelzqsa8f.tchx*s 5ks .6 with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. az.xh6t5fq sc* k s8.s 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 0 t etlh4rbzgn2+vy(-a kinetic energy of 220 J. At the highest poinrtgen42ht+v(- zl b0 yt in its trajectory, its kinetic 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 po.o rbc+ )strssw4r: n3int 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 sosr .:) 4rctbrs 3wn+the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m a lx 1-,dbcgkv r8h7ltm7 n;,cvbove the bottom of a dip (See Fig. 6-2). Neglect fri xbh ;rvl ,tn7ccm,kd-l1 g87vction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 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 startl2.c )3bcc;38 asprlduiltv- s at a point 30 m above the bottom of a dip 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 45 m28;-3c3 prvcut lsb cli.da) l 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 swingn7 1gyrwld*i8/*8axpdl 3ebd 8 n0fed (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 ebl; s9fv/ j bzw6obru72 9s.nma9wo :50 cm is pulled 30 cm away from the vertical axis and released uw.s:b2 a/b9979lfe;zwj onmrb6sov from rest. What will be 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 initially uncom6i2bhl6b cl czi8j3ft ,mv9e5pressed horizontal spring with spring constantf m vt,j8i6lc623bz9e lcibh5 of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop fovz* )fn b9q e1-fa0qbyr a red light. What work i)-bf ezqnayv0* 1fbq 9s 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 dxc + fp ,m0vzdp* j89(1cc0yfav.fa*rpey1aject and a horizontal surface is 50.0 N. If the initial speed of the obj9dd*a *m8zy1,p0+ jrfc 0papfcca1yvxv. (ef ect is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. pkfqv ;f9l0me (nwh,/It has 24 J of kinetic energy. The friction forcef k evn/9 l(pw0hmf;q, 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 horizt2f5tzn e. al4ontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction bet.fn4 aez5lt2tween 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 fro ran7f,umlx45 *agwa .m the top of a 50-m high slope. If the work done by frictioxalf7a,4a mgu.*w5rnn 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 plane. The plane is 4.0 m long and- )omv y3a yhxlo;fetp+( 7l/w rises 2.0pyt) wx3+lovo(l ;mf7eh ya/- 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 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 --j1 6yqq if13wopiyy plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is fi-oy qyw61iy p13-jq 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground w i g:ygs4a:rjhu0 ,q7 xk+6ocdith a velocity of 7.00 m/s. What average force of air friction cjuodx7i:4 a:r6,y0 g+ hskqgacts 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 8+k x-4nhoftb.0-kg boy using energy when he runs up a flight of stairs 10.0 ntbxk4h- +fo8-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity ofd0;q wp8n-w uw5 kcm/c:rmsx* 5.0 m/s. What power must be delivered to the object cuwk q;n5x-c8md:0w /rs w* pmby 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 enac3 ep; 0g:p nyi:*ykqfx/3lxergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 We yy;xfxi lpn*ag /3 k:0pc:q3)

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 5+nhiuwm ce+wz+.d : 4u00 W while riding. How much force does her foot push with when she is zh+d 4n .u+umwciwe :+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 average p)5vdc- x ehj x+;j0btpower delivered by the engine? (1 hp dvx0ejt b-c h;jp5+x)= 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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