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

1#

What is the correct unit of work expressed in SI dm4y ) * )w-0gn 2so:pgbirl7;xwuzsiunits?

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 sys6srm /; *8ok)zdrp xsow9 0tintem 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 agadb ++7d zpe2vxinst a stationary brick wall, the amount of work you +e+zp 27xdd bvdo

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 being held there. How much wok- 7t:4/ztt+ms7 3 l2zwpmjio w br8mgrk is being done in hol m2op3i wwt+mjz/t4z -glsrkm778t :bding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant ei8j6z:lc, ul velocity carrying a 10-N object, the amount of work you doucj: l,l86eiz 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 liftxtm(,qep).2 oftte6)n-a mz ced vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work was dqx,62)n m tzfee) (tac-.mtopone?

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. typ5-h7cmpmfg2p0bxc7c tqf b-,q9 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 straight up. Cxd 8kb wn5ap; vuhc)b(+z9rv :ompare the sign of the work done by gravity whilekurz :) x;wd98nhp bc a(5vbv+ the ball goes up with the sign of the 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 curve, on a .ottrx 228 t:oj8jmowForce versus position (F vs. x) graph, representst:2tot wjj8om.8xr o2

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 done nw9 :orls oqiop(10 gg0f9 e;jby the force Fwfpon9gg o9 jl( :eq0oi 0;sr1?

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'st16il0v ,i fss 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 objeqwi bjs)dqx 9d; -/u*ict is negative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the objec/ut0xiybcw )(t'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 twice the speedwyjuhu n 6m7m ;9+r/yx of the carrym/ +w 7umuyh6n9 j;x. Which statement 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 carm y/jv(s,- rvb2utx /yfs 6j8v(dfm)b J has half the mass of car K. The kinetic energy of car Jfbj vtssm,u8 )d v-(myr(/6vy /bj2fx, 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 bouncg)6n0bvfe-x06w1j b .gnkcw w,tovu 6 es back with half of its original speed. What is thevf6e gju,tk6bowgwx06 cn . )10 w-vbn ratio 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 sp0/msws9 a*3jrp , kvjzeed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what 9vsajsk3z r*jpw0/ m, 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 m/s. A 1.0-kg mass is moving with shg8srv f425tf- aru mj6+og.fpeed 4.0 m/s. Both objects encoungu2 fja 4+f. o8-6trfgvsh mr5ter the 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 certai j-ec;g;k q /legjcj89) ay:bmn distance on a straight, level road. If eg 8:b y k;-j j9e;galmj/c)qcyou had been traveling 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 orbit. Neglecting a8 gh- wabh 4cyf,d*xk2ny friction effects, what happens to the plane,f -xhgcw a8*kh b24dyt'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-energepf p5mqu-;u (y principle.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a systev7 n6;qim wk3rm to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A secyg,a1r eq k3(95xplsyfto(8 y- iikkuj 80*wuond object with *yeq y,rgi3 xt1u8uyli0 f wk( (o-a59j 8kkspfour times the mass of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end o)y6*lg9:xncseiq ivm8s) 6-tplzb- f f a spring causes it to stretch 5.0 cm. If anzy-n*)9l- :f)eqb tl6smc86 psg vxiiother 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical t-i 3khbl6 f))n0hr0g 9syxwi-aign 3energy of a system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic enel;6 avw)zrm9urw; x 1prgy K, to its potential energy U1 ;ur9 lxw6vma r;)zwp.

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 d9 8iosry 1uz.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 with equam xs9xc(3e1l jsaz3,xl speeds along a level frict mx a 39x(1lcxzs,e3jsionless surface. They both slide up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses nsqnri-n .6-zkcv+ c+f s* 8nz$m_{1}$ 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 conservatn-ttxnir 6y-. ion of mechanical energy for conservative forcesnyr itntx-.6 -.

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 fri/zydtk86po q 0ction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at0oqy /8kdz6tp 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 igy1ob -o wkv6.fnore air resistance. How much gravitational potential energy did . 6-fbywkoov1 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 lose- :,7ur:4 n triw)tr)-cvth gdh 0mzexs 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball gai)-u 04-)v :rchnzt rmiegr d :txwt,7hn?

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 conservatib8x,( kxbvm +hk7kji/yb)4rjalv/0 eon 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 is b1hhs-g*c,dk zl, hq 6c99flq

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 :0,g-7wqc vbb smkk5ozt4u7u .r ybp:unit of power expressed in SI units?

A. $kg m/s^2$

B. $kg m^{2}/s^2$

C. $kg m^{2}/s^3$

D. $kg^2 m/s^2$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which i9v,a/ z- 7vefaw 1tevvs not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the workpa su2+o c6fc7f 84apj in one-third the time. To do so, your power output must have becj7p8af c4pu+ o 6saf2en

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the carq (ftybt10tg .'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 tio v1 ;zgh/td.he object weighs 90 N, how much work was done in lifting i do/v;.zgth1it?

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 in7u rl zjh,g 8qou7ewj9p (21r7 t:gqgh the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of the book1gj(:o7,u lq 2uht7 8zpqreggjhr7 w9?

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 upv; ojr4j ;;z7dpq3ywc cmwj5/ward with a constant force of 5500 N for a distance of 50.0 m. What v;;;rpc dc/37ww4 mzjojqjy5 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 constanbt +qtkp 18 hbv5fh.aax: .k9rt force of 5500 N for a distance of 50..k.bhphttr b fkv 9a 5q:+a1x80 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 N fm t:kw:p/tu;n3yceakl ln+ -( or a distance of 50.0 m. What i (nm;:l- pyea+lt w/nkk3t:c us 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 6g )3kn w6kaxh/.xcb qty/0waz 7e w,7r.0 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. iol.ttr7y74m 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 on an icy surfx svs5h,0zle(5kslm r0bw05g ace (assume no friction), with a force of 60.0 N0vlsb5hm,sr5 k5exzgl( 0sw0 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 tz9/;sj zqd6;kz ssr( qg/epv :he direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done wh;qqs( /sk6;ezj dvrp :gz/sz 9en 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 forco;bx jrn*crsq9-9 7wmfilva b3, 0v.ge. The graph in Fig. 6-1 shows the force versus the object's position. Find the work- jm*0 vxqav9 r9blf .o3,7rgs ;bicnw 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. 6-11rj)xduy0 uo : shows the force versus the object's posi: 1x )oryu0udjtion. Find the work done 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 dired;-2 cuye8xn)a by4ec ction of the force. The graph in Fig. 6-1 shows th- c;e 42bndxy)u caye8e force 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 is appl0b) it4d 3qddyuex4t7): efc oied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic eqd ttd3e4:)7ifxy0du 4)b ce onergy 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 h 8p.db*lm9 c5dg8hne b -ng(vis applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What 8mh-.cbveg8b9hp5(*ddn lg n 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 756 h +*lrcohcsd2rckspeed of 5.0 m/s. How much work is required to stop l275c chkr6*+dsrho cthe 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 initial(du,fto r0+plht l8 *dly moving at 25 m/s, what distance is required to stop a car moving at d 0+, r8ldutpfhol(*t 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-xnqrll)dep.( aqjm 6 ck -g(d02td i*2g dart. It is cocked by exerting a force of 20 N ove2 .kpdj06mt2ria-d q( ecq)lgl*x nd(r 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 horizontal component of 80 N and a vertical imfvztu i;tp 7p;i /zg) h4);51irjlfr 5n9y bcomponent of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest,nffl4 g7i9tt;h;)p/vr5;urbi5yj z1izp ) m i 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 tag r n /y91 ccxbzb5v)7mt.yc:k+. tuahe hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the c yu5a..r ctz9gb7ntym:1/) bx+kcvaaverage 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 fsdv4*wncz *q2rom a height of 7.00 m above a floor to a height of 13.0 m above the floor * n2c*qdvzw4s. 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 upcb5tbz9+:t(ai gtol oa0) 4os an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionle9:o5s0gbtoo a)aci tz(+l4 btss, 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 stre9- x+gaf8zgy pr1cr,ctch 2.0 cm. What is the spring ,p1x c+9aycrz8gg fr- 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 spring constant v;;uvb5,o r *hz +pc;ogk kpf8of 60 N/m. How much potential energy does it store, when kzcvp,p+o bk *gh;;5f;ruo8vstretched 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 g:x- wb*l li c55nxzp;initially uncompressed spring with a spring constant o-b; 5*z:cp5gxxlli wnf 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 constn8*s:*b cwlsxq 8:ce kant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstreec*kxnsqslc8 :w:*b 8tched 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 compresjbkumw mmz .;fzgrkkkdk/ajp.9 (8n3--*b+nsed by 3.0 cm. How much work is req9.+k*nmj b/k;zkn8fkzkbr m 3jd (-uma w-gp.uired 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-m high slop*tb;e9bq(l,irjzg dj58c9 x. f n 1)1izgjbzu e. What is the speed of the skier on reaching the bottom of the slozbr5 d9jjbcb8 i(n,.et 9g qu11fjz x*;ilgz)pe? (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+v 70hkr1xk vy top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in1v+kxk vyh7r0 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 4c,w+h9dy z9 nidjkuv q wt bx903b,3wplane. At the bottom, it has a speed of 9.80 m/s. What is the vertical heigh4bx tcn3u,qd99d90 wvbk jw3w+ ih ,yzt 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, itv3* hv,xy ls4js potential energy exactly equals its kinet3v y4 slx*jhv,ic 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/r8y kf+af w6u, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical enewf 6+ukrfy/8a rgy 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 220jlk . pzo vvohb+f 10w-2xun/2 J. At the highest poin own-ux2hjf2v0+1o/v.zbk plt 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 starfmx +spn uimwa5/* ;3tts from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, wha;3us+ wt/ f *xmpmn5iat will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.2(whm8koz mo +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 iso km2 +wz(8omh 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 ( wot7/0,uqrsm q7: cc0ozxw:zvux2ua point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Ne 0zc czu:2vxoowr0 7q7sxu /t:,u(mw qglect 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 the1yekyqqq8wf6if;j8 i -bp7d + 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 2-kg pendulum of length 50 cm is pulled 0y w+6kdz -j5tiufxt-3 jh.o-a.30 m away from the vertical axis and released from rest. What will be its speed at the bottom of its swing?du-zfxa.-56-jt 3hwiy +koj t

A. 0.42 m/s

B. 1.12 m/s

C. 1.68 m/s

D. 1.40 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 initiaadi8 cmrzcc32k j w)b3fzp5*t9,z g*blly uncompressed horizontal spring with3iz)cafg j,bd*czz m*tck3pw r59b8 2 spring 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 22 m/s, slows dowvx8ljkt0/d x.5 )n8zs-of0n osc+sfkn her 2000 kg car to stop for a red light. What work is done by the friction forcels skfx8 v)xtn 8k-0ons./+c 0j5z fod 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 v5vgj*qfyqy02 -i d-e horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it sl0- v*yd vg-qifq52yjeide 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 24 J of kinetic e 6ebu-gki.bh j 6ran95nergy. .b69 jbn6kre ga-5 huiThe friction 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 to a1smp/y d9f(v(e gev,d 2.0-kg mass on a level surface. Thvyv dp(efg( e s1,/9dme coefficient of kinetic 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 fromzy4 rk: +)fexs the top of a 50-m high slope. If the work done b: 4ky)x szfe+ry friction 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 is 4.0 m long 2ptg+nc utt/p,(g 4ke 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 fo24ntpgtc p,k+(u /tgerce 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 inclin1;q5+tw j+hly r e svwnp+y,r*ed at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the spesyq 1+ ,hwwv5 pry+l+*ertj;ned 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 striker)mwv 0 m,-py g7wpb;ks the ground with a velocity of 7.00 m/s. What average force of air frictp-,7w) mr0 pvgy wb;mkion acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a fug0 )z rv5wh)ff,nci liob1-.yk-.wplight of stairs 10.0-m high h).w5 i ,lw1fnuki0gzvoy) c-brp- .f, 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 veloczr )mvuu+* lc6ity of 5.0 m/s. What powe6) zuc*u lvm+rr 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 mot rg -fys,g1+ssor that runs for 1.0 hr? (1 hps,+-g ssgy1r f = 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 riding. How much for u6(d+icq4fkrce does her foot push wkr4qdc f+(i6uith 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 mk mipl60q/ v+ kip678o6nx6fmmb:gfin 7.0 s. What is the average power delivered by the engine? (1 hp = 746 W)vfqp7p+lon66 m 8bmi g6i6mxk:/f m0k

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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