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

1#

What is the correct unit of work expressed in SI unit7x cwckmgc-w kz0 b73+s?

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 therynh1z* . yp;l/3s v+hja v5aore is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount oba 6:e82pr- cxyo-cys5dd 0im f work youydr c:c 2i0aspxm-b 58yo 6d-e 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 being held there. How much wor6 -6vp-eb npjc0suu0 nk is being done in holding the box in this p0 pej uuv6- 6s0nnc-pbosition?

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 conster /8 j4qvd.)y6leivb: sg k3lant velocity carrying a 10-N object, tr8/)lk6g43ve il de.yvb :qsj he 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 vertically 3.0 mv ic/grx,sz4. h1,ybe then returned to its original position. If the total weight is 30 N, hozs/vy, gr4i,1x behc. w much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work o u-4ucpq*1khq -.cw eun 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 *ws(:mi/sfen+nr 5 pbgravity while the ball goes up with the sign of the workfe+b(rmsn *ns :iwp/5 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 aw u0 sdh1lrs .++9:cnbg6 lypw Force versus position (F vs. x) graph, represents.dl+9cw6u l0b ps wr+s:hgn1y

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 positioqg bwa,f;-h 1y-qi1 qon (F vs. x), what represents the work done by the forqh qaqiw;-fo yb-g11,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 on an object is positive, then the object's kineticsyxa*9na hqq*avu/2zd* 6s 5v 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 kinetic energy px(eco-2flar.29t+ ky r+fb l

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 oj((ktwbj,5hgy -y v2a bject is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at t90pq5me 52d)gnjlyak wice the speed of the car. Which statemk5)edy lp0 q2anjm5g 9ent 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 ;rfc kf ztz ,,c4wj+3whas half the mass of car K. The kinetic + ;cfw rjk3zt4 ,,wfczenergy of 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 half of its original speed. What i z7 50cwcwtwg7xe 4a*ys the ratio of the finazxy5c gewtaww7c740* l 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 and a pebble is moving at a speed ga1oge-mtqk;-k o;.v of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock';-1g-o o;vteqakmk g.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 6 / -,lgwz jk3 lplgp:),4btvwb-n tiuspeed 4.0 m/s. Both objects encounter the same constant brnwl blptwv p,:3)- bg/ u t,iz6-lg4kjaking 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 yopv6vfo* qh:)z2: p;pvm mg 5ac*rrp(wur car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as mo*v:mh2zpvcr*)g:(;w p6f pp rav5 q 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 orw w7i: tr(t1frtmn-p4bit. Neglecting any friction efr(wpr-41iw: 7 nfmttt fects, what happens 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 pq) s+rr(l/vb gc(qkr:8(-fnz8 zuxg srinciple.

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 havyxm+bhd a )ur92n*4 gze 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 releasede jxhgq4 du68kkqm9 dytf8,4 ; from rest a height h above the ground. A second object with four times the mass of the first if 8 89dg,f4e6qxmhqyju 4dk ;tk 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 of a sprm9 dvij+zt5 998ei;( u ,yxffzisplv6ing causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the s6tfmx+ y,9zdii(;fs upv 9i9l8 jze 5vpring 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 energa n fy7mx)23m.b-nx qgy of a system

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to its potential 7dd/6gt/krn2 zl8iv penergy n8r l pd/vk7/td6giz2 U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a hijva*2xxv0)y h(vvp2v/y dsq 3ll.

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 slif tig+jr 92mw)ding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which risesj)+ w9 ft2grmi 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 ;en olrbpe72gt6tmg7 n2o.7s$m_{1}$ 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 emkfq la88rn(/a-:of snergy for conservative forces. (ks- a:orf/8aq mfln8

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 (ah2.ummwgi2* kir friction is present), to the ground below. How does the kinetic energy (K) just before strikini2 hm2gk.*wmug the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. Do not ignorp 9ox 67m.ushbe air resistance. How much gravitational potential ene7. hxu6sb 9opmrgy 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 andineud i:mel(9j:4ymj5n4zf 6 loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy (yi:e:4ne9jfu z6 5mnim 4jlddid 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 cons7vyf2 m 4gslte/ckx,, su2r 1zervation 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-cy9-,k:wugt p c6 hjt

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 7 rtcyz89v*ep.fjz,m 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 is not a un;sx7(dlq 1lms m hxv v/bwd*96it 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-third 0;bjz,kjfa *4s(d a.uw 0 bpbcthe time. To do so, your power outwps,dbakbb*.jc 00uf( j4;azput 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 13.a8i; lsini27zhw c-lgdz racceleration, 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. Ifem4faun,he 8 ogxc/.8 the object weighs 90 N, how x hg4 eu8n8am,.feco/much work was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1gj4im8 c mzvo4)izo/..0 m, at a constant velocity of 0.50 m/s. Whm 4/ioz)vozm.8c4jig at 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 5500q 57/ ez2na t9flcbq/rh. yzo2 N for a distance of 50.0 m. What isrb zzqyto2927q//5 hlaen. cf 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 uccts8c7m g m +*c28eiopward with a constant force of 5500 N for a distance of 50.0 7msce* 8g+occtimc8 2m. 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 f9 s7hxzfqfcuq5w) (1hor a distance of 50.0 m. What is the ne1f7)9 q5uhfx ws(qz cht 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 alok1fy 9v9 (xpoung 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, in lxaq:2 (2jwr3akm4waclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

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

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (ass( bfc8d mxgzl8ej8a 6l*.x ghv81x0u hume no friction), with a (g8m.8x dxl8jbca zul0f8ve * 1hh6xgforce 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 objectow+v*kcnrw3urgoz9 yv 6tr 42lc h+u1-81 n ck in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when tryonch1lu vn1+24z8 g3 orwcrv- t*kwc u9k+6he 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 ek3lds 3v))uf direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the workludve)f k )33s 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. Thesge dz6ia;/ bvj8);.(bzn( mgvjxkq ; graph in Fig. 6-1 shows the force versus the object's position. Fxvk b jg;a6jsn .(d(zz q)ib ;;mv8/geind 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 direction of the gvo1) og k4od5./a-u swuh+ emforce. The graph in Fig. 6-1 shows the force versus t h4a/msg.u+5 w-1ouvdegoko)he 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 ap009ifrh cf6ydplied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of tyd0h9ir cf 60fhe 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 5ecwm:fg)* fj85-kg cart (initially at rest) across m wff ge:8)*cja 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 worki -a t83z g4ah,sdscn3 is required to stop thed cs43z tna,3as -i8hg 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/s, what distance ij6* .: xynsusss required to stop a car moving at 50 m/s under the same cx6ussn:.*y s jondition?

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. ghcltb69ao-8 x+. qun7qkqm.It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart-a htg lm+7qoq9nb6kc..8ux q 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 o8 -qbn ud)*0be5t gempf 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from resn)q- d5uep 8b*tbegm0 t, 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 (9lks6whx)s y(t enn/shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before sto/)(6kxs y l9(hwe nstnpping. 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 tc (1ts 1chrh 3l9w8njfo a height of 13.0 m above the floor. What is the change in gravitatht 8rhcsjw 1n1f3c9 (lional 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 inclin ; kmo bd75cmmyjxl01;ed plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictk; cmmm01dobx;5ly j7ionless, 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 cm8 0(qtgpqzs:n . What is the spr:8pn(0g sq tqzing 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 of 60 N/m. How vvi;op d4 mdk;b: 9+bfmuch potential energy does it store, when stretc4d 9mfv; k:b+vipb;o dhed 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 sprin86 zkpt 7+ta3*mt dnnag with a spring constant of 25 N/m by 10 cn6t+k73 a* 8mapn tdtzm.

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 frod*k f;)28ka(po sh1cpoc/ vb gm x = 0.20 m to 0. 8*h /p;kgsbf2v1dpac() koo c25 m? (Assume the 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 comprayung,qcbvn5px jz3k (-as*72mv+,p essed by 3.0 cm. How much work is required to compress the spring an additiomu g nz 2-57+k(qx*p y,jbavvp3sn ac,nal 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 hig k2dom0ctl32u h slope. What is the speed of thoud3 kc0mtl2 2e slier on reaching the bottom 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/1eqp3mu5q as) pzhm/ an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving epmp)h35 u/ s /qmqz1aafter 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 frictionlehu(g2;i m0 5ovckpve 4 hn/dc4ss inclined plane. At the bottom, it has a speed of 9.80 m/sm ghhuc(;vv2d05npe4 cko4i/ . 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,n y3pq8;i y0sm: 9f(ohmj ipq/ its potential enn pm;(mo h/pyf80iy3q:ji9qsergy 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 fromx o*o ag ijg(x8t*vz-n18t,ib ground level with a kinetic energy of 40t,- to(1nzx*i8bvax i g o*8gj J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinet:h4usw*o4k iz2s2i2pv *qqn wic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relat2s2s4:hpo*i kw2z vu qnq*4iwive 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 frolgbvv b3d1qh3dq6( 0gyoh )b2 m rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be tolg)vvq3(yh6b dq0gb13 b2h d he 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 c t-p; cbb-f6r.)areb+3mgqxspeed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rollg-pxarr)6beb-.mqt +c 3 fbc;er 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 starts at a point 30 m above the bottom of a dip with l 53h 5/ 4jkmle;ddvega speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller 4dlvgd/ 3ehe 5j;l mk5coaster 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 oz.5 f++ y6efgarcy: h+smkif*f its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the v/kwmsyw1j+g(w7 ne se6.h 8t vertical axis and released from rest. What will be itse7nej6 w (s/hkwtw. m1g+s8vy 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 int3.r u:.q dw lq6y.r47m mmjeeitially uncompressed horizontal spring with sprin3e yqu6.t jwe .mrrmmd7 q:l.4g 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, ub:nrttsz )javejl7 . :h-f ,6slows down her 2000 kg car to stop for a red light. Whathttj6vfr.zue,lj-san b7):: 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 forc l(mt-oiwiv.hm ))fde.-/ qvl e between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, w)l(wv fh.) oletvm.-qmd-ii / hat 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 sur0ul79wemt)gcjz eq/i ;r .i,iface. It has 24 J of kinetic energy. The friction ,wg c0iqel; 7 t)9rijei/.muzforce 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 a 2.0-kg mass on a levep c0l c+a. )fjeh)hz1pl surface. The coefp hal)ec01p .j czhf+)ficient 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 from the top ofsts9 m uz)9g/)-vg/pfk xife 6 a 50-m high slope. If the work done 9uzg s-ms9)/vfkfxgp6te i /)by friction 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. 6*rgwh,rw xa( The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. Wha6,rw(xrg awh* t 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 re folkuy/90k xc-v;n3xst at the top of a plane inclined at 20e above horizontal. The coeff/ok390yux lcn;- f kvxicient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a hpqehei+el-i) n7*q +/1jg a jneight of 10.0 m, and strikes the ground with a velocity of 7/e+n)*l+ nej gqqah-e p j1ii7.00 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 whennwsh 7l+dfrw21)j d7 s he runs up a flight of stairs 10.0-m high,sd2d 7)71+wwsj nrlfh 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 of yi5 )y3nq ghmi:bu17t5.0 m/s. What power must be delivered to the objecti q 3y1nt )h5yi7u:mgb 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 .m9 5jgi2u t.nrq;5z+ 8i-idnglbihdare used by a 1.0 hp motor that runs for 1.0 hr? (1 hp ti 5iri.82ndjqg i-gzh+d59 b; lm.un = 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. H6s3jx7i+os l( j7kghjow much force does her foot push with when she is traveling at 8.7og (s+h6x7ils jj3kj 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 6f*- ):c /xw gpqxcwg/owv.offrom 0 to 25 m/s in 7.0 s. What is the average power de)w :w//cxcov.6-fq fw *gxpgolivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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