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

1#

What is the correct unit of work expressed in SI unitmkr ; de1 srv1vm5/2 q9,yxklms?

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 systrif.u(t7brx8,k s4 r yem 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 brick wall, the amounk3ty a qnh14/tt of work you t y3thka/4n1q 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 t jq-y t;6rr0dbeing held there. How much work is being done in holdinr60jtyrqt -;dg 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 const i ugsdbbg9uv2/z/n1z .f gr0*ant velocity carrying a 10-N object, the amount of work you do /g r f.i n*zvs0b9zb2gugu/d1is

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.fjkli4 co2 58z0 m then returned to its original position. If the total weight is 30 N, how much work was 2il5 z4 k8cjfodone?

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 1u5f ;wupm e4eccvm75on an object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work1a j vs+v-mi6z done by gravity while the ball goes up with the sign of the work done by gravity while it goes -zams6+vi j v1down.

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 chw , ((,bf ojgwiul ll1..7bw5vwqp; burve, on a Force versus position (F vs. x) graph, represents1w wg.pi.,l5luwbbq who lv7j,( fb;(

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 dp b . ,kt:+ugji;p,l4ho9y tn5y9sw cnone by th9n5l,ihwbus 9ot gn,p c.y ;4:tjky+ pe force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kineti,uar x zx2oq+.4p.(zd q fi.(gfgglo+c 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 objec +fjp9dl e.4syonc6s etjg: 9yn)g89y t 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 *hv)hr18txqmz lbj:qv5ec96on an object 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 twice kqi8laz 6v.l *e5g u5 8nl:nlathe speed of the car. Which statement is true about the truck's kinetic energy comparei5llka 86*legvaq8. :5nnuzld 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, ans7y)dlg dsgliqg,/6 9 d car J has half the mass of car K. The kinetic enes/)il9 7sd 6gdyl, gqgrgy 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. W ww+ 8in/vi.fvrs+e.chat is the ratio of the final n i8c+e.v+/ i.fv wwsrkinetic 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 ad *w;w 1kavmz +4chxx .hk/f(l speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick ha; ld(/fmkcv. zxkw wx+14*h'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 msvat7kbe + -sdqb/4k 1w i5s)cass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before aqske vbs b c/sd+54)tw7-ki1stopping?

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 yo n8orl 7vvu-n3ur car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car vlnu 873no-rvhave 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 a b0;/saqw oj9pny friction effects, what happens to the pla0j s/wp o;9qbanet'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 princi 8r)av+;hydi/k8g )axi:vp +eav d9jcple.

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 negatvy z(3sfo24aci zk+c (cipjue+-i z:8ive 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 s56kkv n/wrhr vtx)jez84qi.; econd object with four timq6z vn4;khjw5rr8 i/ekvx).t es 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 of a spring causes it to xvjar.;veu 9)stretch 5.0 cm. If another 0.200-kg mass is added to the sprinxejv9.) urva; g, 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 d*mx a idnk--95hlv bswo9l33u+dcy:energy 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 eb.;p qj)c-z3wsic p+a nergy K, to its potential energy U.bq3j- s).appwicc+;z

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 driz b6hks4-w8 qqving 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 w6i 8+jkq19gltd6itt5j 9 jx fvery heavy object are sliding with equal speeds along a level frictionlej+qdt 9tx5fil 6ki81t9gjjw6ss 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 d1e1d05v5t w tz3bzun9 vc *qk$m_{1}$ 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 c-hzehbr; ie6d dq2l o7* rvd j,a4l/i:onservation of mechanical energy for conservative forces. j,lie6-hodd b24*rh er/d:qa7; liv z

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 (xc8 7mcbne6r:saq()q air friction is present), to the ground below. How does the kinetic energy (K) just beforsm x7b(qn acce)r:8q6e striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and g)ywps 7m/sw2 iains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did ps2 ) smyww7i/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 potentg4 6zl*imr0y uyr ;4eeial energy. Do not ignorymi0eyg4lr *zr4 6;eue air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of energo +*l gy7+hbp3cili-vy.

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)8 dptbam 1k2g

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 powmhv +:ow6fqz/ er 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 w y(dh4zgv *uvb, 3i8aa 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 wog26cn uxq4i r .;qp6 /pnbr6nurk in one-third the time. To do so, your power outp;grpu4 qqn6u6xn rb/ n6.pi2cut 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 .yrid8 as/c4 .7pis2yb 9q xbkacceleration, 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 vx)tu 1t5giv w vle,5;nertically 2.0 m and held there. If the object weighs 90 N, how much work was done in lifti 5t;vev) nlg,5wxi1tung 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 bookhm d3rhb3:6utwd9n vy( 8cg k/ up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the yv tc3r/w db89kdh h u6g:3(nmweight 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 wgt6(4 t bk(eitith a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 55t6i4( bt (tkeg00 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force g; lkjybq//pq,3k(n/er ig z+ of 5500 N for a distance of 50.0 m. Wha/bg p3,;(k + ye i/qrlgzj/nqkt 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 e: m5bze4, klqjz(w;cN for a distance of 50.0 meb;kjle4(5zm, z q: wc. What is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up along a*exat9o*,qdbraacy7uf p+8 , $37^{\circ}$ 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 fruiq7de7dt5pz)jpe- tg/t 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 Sara)k (z- jzyavh /subp/0iaa,*lh in a sled on an icy surface (assume no frictia/ vzbp/,*lai k- u0hz)s ya(jon), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the guaa9ecm6, j5;l p3 xf6esg +vdirection of the force. The graph in Fig. 6-1 shows the force vers5 vx6p6mecg3aejsu9f+ ; ag,lus the object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an objectz/r ya 44b7e j5uir3f x8 fm wj4y9c,xnf+um,r 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 the object moves from 7yx49/mjr e8rczijy mfu4rb ,4n fxw5,3uf+a 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 szmf*j8kmg.8 -1 shows the force versus the object's position. Find the work d.88*mkszg mfj one 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 6.8 (oj9rtdw2pyh)ihtn* evi the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the ti86j*p(tyweo.)h2dir 9 v nhwork 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 restzrn( 3e- z46 us6 d,vipeo0xer9ce0hj) acrds nr604 pxezj re6hvec0 3i e-u9o(,zoss a 10 m level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initiw8a;ygmr - o;*/gcl1.jwje*foy s)sxiyl) g 7 ally at rest) across a 10 m level surface. What is the final speed of the y *;/m)gwg 7w e;rlya).os1co isj-x8l*ygj f 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 myov5 58 peqns: ,wvod3uch work is required to stop the mass y,55dspvon: qoe3vw8?

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 5tuq.pmu goum 8 24uw8m/s, what distance is required tp.m48qmg u uu5w 28uoto stop a car moving at 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 1t9. -euz a)fechoez--0-g dart. It is cocked by exerting a force of 20 N over a distancee-u-9o)taz-ce z. fhe 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 coxj xvqz)u 1)r:oa a04fmponent 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 horizonox af)z4x)0q:1ar v ujtally 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 int+-d 6k:znop sgo a bale of hay, striking the hay with a velocity of 60 m/sd6gz-+:pno ks. 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 from a height of 7.00 m 2*ir+cri5w 4 giwoak 3above a floor to a height of 13.0 m above the floor. What is the ch5iwg* +r34 2ia iokrwcange 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 h0:n mib 8r;xhyff3 cguwdfe)7-/rk8m long and rises 2.0 m. If the plane is frictionleyw;d/m3f ) -r gcibnff70xu:hh 8kr8ess, 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, caut3 lx2 p1gwj(wses the spring to stretch 2.0 cm. What is the tw g1lj w(23pxspring 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 much 5cs/hr rskn,nbj)-x0potential energy does it store, whenhjnb r kxc,)/s-0srn 5 stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work reqnl)i1p jp44 g;g 7zxdvj359k,a dg4/ lhybrsxuired to compress an initially uncompressed spring with a spring constant of 25 N/m bd/l 4v 1dn hyrajx4p,sp3k 4jgg57 ;)gzxbil9y 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 stret* wv8xzs*j /wjch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position iv8*jsx*wwj/ zs 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 ij63s8x6b1ml vh- za kfs initially compressed by 3.0 cm. How much work is required -l68m kj1 bx6savf3hzto 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.fsq6 md5t(k ).d9nepg8q tvq*uoj u/-m high slope. What is the speed of the skier on reaching the bottom of the slope? (neglec quf.59)*kqet(jsq8n6. gm vtp dou/dt 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 top of a hill t :u3*z7vfl6cy 4 dwhk2ho .qswith an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in eley7 6zqf swd k 2h.*uhltv3:oc4vation?

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 frictionle3 prbsf0s,qbh0cpt g rm1(63t ss inclined plane. At the bottom, it has a speed of 9hg6s 10p r3fb(rtcm3 ,qsbp0t.80 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, its potenq-l/t-wr fe rn/ lg4h)tir/g)l le-wfhnq r 4t/-al energy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground level with a ki)btzb:i n7;kms j 85elnetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 b5z ntj:7e s8ilk;mb) 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 witq67ovgz9exa 33py 1t lh a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relx7a vzqy33toel 1g 9p6ative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom oi/d+*td y ytb+0unc-uf 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 thebt*+y+/di-0cut y und bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the bn+ c v 1ps;asy+ekg:x7ottom of a dip (See Fig. 6-2). N1k+g 7:vc sa pe;sy+xneglect 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 starts at a point 30u5jbc7(m4zpd,qvs 9e33hmj l 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 coasterbe,3jq4 vcp5 (3m mh9suj7dlz 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 5tmqi3u: js/)d,jx lp 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 0.16 m away fromvmw).l7qk b)xwd)oy: d7nu/4fob . ax the vertical axis and released from rest. What will be io )m:ln77w/b .v bqykxawud4. d)xof)ts speed at the bottom of its swing?

A. 0.2154 m/s

B. 0.574 m/s

C. 0.861 m/s

D. 0.718 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompresseq7uu3h.li o/ox mz b-+d horizontal spring with spring constant ouz ou+x-l3bim7./q ohf $2.0 \times 10^6 \; N/m$. 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 :qyjb;t j2+hi down her 2000 kg car to stop for a red light. What work is done by the fricjh b:qy 2;ij+ttion force against the wheels?

A. $-2.2 \times 10^{4} \; J$

B. $-4.4 \times 10^{4} \; J$

C. $-4.84 \times 10^{5} \; J$

D. $-9.68 \times 10^{5} \; J$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0xdtt*bx 3uph545n7j pqqq s 73-kg object and a horizontal surface is 50.0 N. If the initial s qsb pdp5t7qh3*5 xuq43xt 7jnpeed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough,ocm 95cmo;te - level surface. It has 24 J of kinetic energy. The friction force on it is a -e;to moc9c5m 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 lw 5: aseiqh orv,49bz(evel surface. The coefficient of kinetic friction between the mass and the surface is 0.(a,e5qsb4zw 9:ihvr o20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. z7hdc(,iso pe 0ij/(g If the work done by friction jpsg(he0iod7 i (zc,/ 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 anjlm7 mxeq,qz6g r;f6 ryw373e inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to e6xq frqr 3y,w6 3emmgj 7lz7;get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20e abovep oc0:drf s-*r horizontal. The coefficient of kinetic friction opr csd0r *-:fbetween 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 hlu4os p 3l.3pleight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it sl3 p3lpl. ou4falls?

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 ),;tfoe1hnem,n h bi/ 3vrun) when he runs up a flight of stairs 10.0-m high,eo1 nui)mnb /nrf3e;vh,) ,ht 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 needeo 2fwn y5w dzep1op0*8d to move an object with a constant velocity of 5.0 m/s. What power must10* zefp2 nwdopy85 ow 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 usedrao (nny,p v)5z)yj 4e by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 vjzr, )( nyo 5pe)4yanW)

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 mucs4asz1o (p,6zooj sd 83e5t cgh force does her foot push with when she is traveling at 88d 1ooezsg5cj3s a (,4ztpso 6.0 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 thetmxnkc, 4: uk5i2rqltk.k 9a ; average power delivered by the engin4,urk: it2q n.95cxmkla;kkt e? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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