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

1#

What is the correct unit of work expresseif*ns5gdil3 *d in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a syste1nx+7ble;hn60knhn kg8r /cu m if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary br m9+yqaq y;tq3ick wall, the amount of work you da+m9yq3;tqyq o

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 2pvmy(,+z )k iy0g -rhm.0 m vertically and is being held there. How much work is being done in holding the box in this p impv,rhy0kmgyz(-) +osition?

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 horizoom,vvao (/ x+mntally forward at a constant velocity carrying a 10-N object, the amount of work you do is(v/ovoa+xm,m

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 td- o hyl045it n+lvzrowm-z1 /hen returned to its original position. If the totall iwv-1zntm 4y/o - 0rhod+lz5 weight 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 acting on an object fy9/i64gr yzi)e /h g3g4epq gdo 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 don,i g dnz jl6-e(.ptjt4e by gravity while the ball goes up with the sign of the work done by gravity while itiptdjl4 j,ze-(t n6.g goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force vers*3,jy pxhpzwj )0.zd lus position (F vs. x) graph, represents xp.,hw*3)0yjzpdj lz

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 represer7im0g .v pa(nwkg o;dc).c r/nts the work done by the forc doi0wr( /.m7)c an.gckrpv g;e 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 tvzmg )u:z-umn0 ):y3+bc xcrmhe 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,dqg4,d rf2nyxmd,gr jz g ( ,n3m+zl+1 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 objectco:jton:-lg l0fqi/ur i :i ); 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 oi0vtq b az9m 04l*3bba car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to t b0 qzbo9 i0a43tvmb*lhat 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 ajcva8kw 8*l(z /eiv0(uh e/kms car K, and car J has half the mass of car K. The kinetic eneilve*08u /hje8k( c /m( zawvkrgy 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 b as-mofa*an wrs3i9 6:ounces back with half of its original speed. What is the ratio of as6*is:9n maar-wo3fthe final kinetic energy to the initial kinetic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is a z*hp,x( 6pf5o*l ubkmoving at a speed of 5 m/s. If both objects have the same kinetic enerp(okb*f z6*p5xl au,hgy, 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 m/s. A j;2*ev-kp*e qyh4 qmb 1.0-kg mass is moving with speed 4.0 j;p*y*-emv 4q qb2hekm/s. Both objects encounter 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 certain distance on a (fnevh:3.q )hya o0icstraight, level road. If you had been traveling twice as fast, wo)iy.qv( ec30an hf h:hat 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 df184icdqu,i any friction ,d fiq4 1ciu8deffects, 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 princd,j j 3i7vcs3h cdncz07tto84iple.

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 n sic0dd/; wf9pc64kp tegative 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 second objects9gg z,j+io *(yyimx4 al odx3:p*ck3 with four times the mass of the first if released from the same height. 9j xl:myd(ax3g sco*4 ko,y+z3*igi p 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.a:i0ea8t d)qgmf(p z5s6wa mf a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is amews85 iptdag0qm6) .:f a(azdded 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 energy ktowh1*mbique8- 5 m(1.bg/1rpwdx n 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, g6w f-7gnasl5*vnw s, to its potential energ*,7wsnag n6fw5sgv l-y U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car dri;w-d0 vutd bzh6zgn57ving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very hea d,s4;ov 6yrhuvy object are sliding with equal speeds along a level frictionless surfac;s,rouv hd4 y6e. 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 owzl b*e8+mz 3; z a bx4/p9nmbw(nfa+$m_{1}$ 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 1p:hc7* dgoc 0y o,hycconservation of mechanical energy for conservative forcesohhg,y c:d op*07cc1y.

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air friction is:**p : xo2bdgxcugbc+ present), to the ground below. How does the kinetic energy (K) just before s*og:*x g2udc b :c+bpxtriking 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 noc aw./k r/u+ajt ignore air resistance. How much gravitational potentiaa +ajr/uk.c /wl 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 gravitational potential ea040yigajow kj;h;8dg *d*x lnergy. Do not ignore air resistance. How much kinetic energy 0k 8y* 4wj*a0hxio;d djlagg;did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conse(km+m g5/6c wmncwp6g u + j-2ufh8z17kfrqqd rvation 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 iskd1knvn43t* :5w q nsz

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 unit3g(en07qag5jprg pc7 i1p yz4s?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of powrgsc zbfj,88/er?

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 tx qzma5 c/3yw:he work in one-third the time. To do so, your power output must havem :caqwx35 z/y 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 acceleration, the car's eng zawdr6.rc .6eine 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 h5ypq)i.gzk ,o 3qh(mce- j 3 tkg5kky:eld there. If the object weighs 90 N, how much work was done in liko.,kg(t5c)y : qhky5 zje3 gq3ki-pmfting 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 ai6 p-i, hqka4t7gak(pw iq/( a3lcsu 8nr a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weiaqkl gp6a,3n(a ihiws -/cq u 7(k8p4tght 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 fh *2190wbi4cmhwe plqor a distance of 50.0 m. What is the wor*cewh10 2m phql iwb94k 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 constanwd*x bt c209 :g0ujywmt force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the*dwyc0b9tgx:jmw u 2 0 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 )cd c.e(+* gbayq ,orxforce of 5500 N for a distance of 50.0 m. What is the net work done on the e,dq)y(e aoc *bcr.+xglevator?

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 along a wpw h;yx +)at f+v0;zz$37^{\circ}$ 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 fruiti lf5ejybt(1; 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 sleds 8+kg ( jcitgrz rh(x70 um-ylac*-a1 on an icy surface (assume no friction), with a force of 60.0 N at an angle olsiur1x-+r8aga m 0ct k7cj- zg*hy((f $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fhi wln;y-uchmzz 8hr hi+9a8 (h bf.,;ig. 6-1 shows the force versus the objec89ha ci+uzi .;by fh;z,8r h(lmnhh-w t's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph zkqro*j 1q lxwn1,x,df0n2s )in Fig. 6-1 shows the force versussl*1)woxq0,q ,rd f2 jz1n nkx the object's position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the forc 7 2 ahxgtr2ygsps -s)y.tbl1(e. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to 6lxgg h y- s7rpyt.(2abss 1t2).0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig.y+y7- 5uzn tm5 zqlm.n 6-1 shows the force versus the object's position. Find the w-tm.y yz5q+mn 5u lnz7ork done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially at restc b7m )ih2o*yo,nsz:e ) across a 10 m lei sby o72,zm c:)eo*nhvel surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a a xo.12uk/d5jnjezd8 y8 bf/c55-kg cart (initially at rest) across a 1x j j 8ob25n/eud.fd1ay8czk/0 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 56f zjv)6qy5a m.0 m/s. How much work is required to stop the mass?)yfqv6 j zm6a5

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, whatqkm(: wmisunjxt5 *m3 zg2 )r*,cahwd54;mwn distance is required to stop a car moving at 50 m/s undenw 5gczm( jk2 w4mwumq3sdmx)5;,:**ia tn r hr 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 hs1ozq.:s8hhzg/y;mby exerting a force of 20 N over a distance of / z so8h:1;hqz.g ymhs5.0 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 horizontalk:5v4*iyuyxza a e 97y component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizon ayu y:kzy4xa7v9*ei 5tally 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 g28 di77ll fdvb72u4-v pvyvmx is shot horizontally into a bale of hay, striking the hay with a velx-4b2v7l fd upmv2di vyl 7v78ocity of 60 m/s. It penetrates 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 8o 0geteu ,(tb,vma2 qfrom a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is av(qmg b,te,0ou8 t2 ethe 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 lonp5f+kw8 h/ic vg and rises 2.0 m. If the plane is frictionless, how much work was done by the pus k/ichf8vp+w5 h?

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. Wgv+t27(-vdrxciqhw;l*nqm 0ng/e )that is the spring c )g/igtcv;dxe 0wq* nrvhm72n(-ql+ tonstant?

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*e6,ck pi2d7nc0sw0 mz q2lum N/m. How much potential energy does it store, when stretched by 1.,d0ki l7e2u0mc mz wq spc*26n0 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 reqgtl;rhy*9w 3 kuired to compress an initially uncompressed spring with a spyt;g r* 9w3lhkring constant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant l,z+uyy+w .vd40 N/m from x = 0.20 m to 0.25 m? (Assume the unszv, yyd.u+ wl+tretched 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 constan /aw hej4:bmhrxu6,j5t of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring 4,uxw 6b/ajmh:jr e5han 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 highc9pxobcz-mg0 ,c hh z4.,k;qn slope. What is the speed of the slier on reaching the bottom of the slop zkcc cn49; gho m,b0q,-xhzp.e? (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 init* ihr5ty1dn. az5a6y y zumt/ fac8g59ial speed of 4.0 m/s. Neglecting friction, how fast will she be moving afterhfmynra56azg19 *i5 t8 5c yudyz.ta / 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 aa 4ug6n2u zvepd1 yr1d9:bu- n 1xrc.s speed of 9.80 m/s. Wha1eus un1u1 6xn2ac gdv:4dr9rbzy.-pt 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 i *mk2ms d(nsf/t is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it mo*2 k/s(mn dsfmving?

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 groundgerxl04a ,n(fpm:ij* level with a kinetic energy oe*a n4ipf rj0(mxg:,lf 40 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 kinetic energy of 220 6w/xa24tdm 0k dkdd6kue8a*c J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch poi d8mk0wuac/k 2* kdtd66xade4nt, 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 point 45 m above thu)gsox*i i. wc)zh6 f9e bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the botu96.g xf *s)oh cii)wztom 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 poiv 9 pv2(qycm lpatjz18 b:0hf0nt 45 m above the bottom obvpa20z vc yt (p8 hm0ql:91fjf a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 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 starts9t 1maep u7m3s 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 next71 tepam93usm slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of it 0-hl*ae64 md6lunr7bqa:uz ss 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 ver 1t qlr( np.d90 si)/heuonbg7tical axis and released from resi1 qr9pe)(n.t 0s/gho nudb7lt. 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 inerm5 /ekzw)5va r:ku lwg 4s11pqch,3itially uncompressed horizontal spring with spring constant 3r ,4akg1wzm leuk:sph55v ew)/ q1crof $2.0 \times 10^6 \; N/m$. 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 her912ju ;je6anz( t,3x j4bb f g8wndqtv 2000 kg car to stop for a red light. What work is done by the friction force8qf(1djv bn6xazte2tjj4b9 , uwg ;3n 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 p s3.r9viwx3gbetween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m wvi3 pg9x.s3r/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 7zqow3xre.w7:19k g9n-n r yzervi1x on a rough, level surface. It has 24 J of kinetic energy. The friction force n9z3 irzwxk71wr .yr9 ne gqxve:1o7-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 mass1 :1oz*v 3b k9;e(fh)zkbq2qjzjz 6a*e rpvkd on a level surface. The 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 kine;rvo(z)e9qjj:k beqk2 k hd *1*zzf13vbzp6a tic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. If the wy3+uohhcal vpepvw- .2 07lg+ork do . uh0oawpelcv3 phgy72++v-lne 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. The plane is 4.0 m longewbri6umqd35 oct 3km0 2(e*t,z1bk u and rises 2.0 m. It requires 3200 J of work to get the box to the top of the z0(6,t5ibkm1 ee cu t2qrbok33w* mduplane. 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 relea43 x25ek* 7fxsn1r l,pvjf jonsed from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of tnfx3selk n pf,125x7rvj*o4 jhe 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 mw6 7jzp3afd)5l* kaxg, and strikes the ground with a velocity of 7.00 m/s. What average force of ail k* 7agf5zwdp3 )j6axr friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight o31re1;v 8cc(ahqu .d pjo4m zo0mho1uf stairs 10.0-m high, 14e1 m;mrh o8hj3 uco p1dvou(0zqac.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 5.0 m/s. Weq5d(eh-efa ,5 k9ywifu q2:what power must be delivered to the object by 5 k:faeq5u (wdfi-,9 2yweqhethe force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy a ;fa 6xd0ajb1 )sy5lrjre used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 Wa y6jdrs)lj ;a1xbf05)

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 /m,jycd a8i4h rate of 500 W while riding. How much force does her foot push wit8ai ,mh c/4dyjh when she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the averaged5 w+3e 5e8zzg gfji2y power delivered b5+ ee3zg8 5dji2wfy zgy the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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