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

1#

What is the correct unit of work expressed in Sx) 2 whcb .dx;ut*+idv1+ licyI 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 s:ovpl3z ee0:5vb/ zf xystem 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 brq2voa k 8r/j6fick wall, the amount of work you rv qjka286 f/odo

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 m e6p118hljzda v 1p2rcuch work is being done in holding the box in thisrj1cl1ppe 86 d hvza21 position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carrying af8;okfaks9 dl3+k mw/ 10-N obje; ws3dom +kf9/fk8 alkct, the 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 m then dg*c jv(v s1lf/64 a4 .x *vow1ocwrurreturned to its original position. If th/ a4wgr*fvu4c1o1l o j6d(.rwvx v *cse total 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 e)/ tg1 /zxlarf z7 nd- 3(+afuri td//urd(pxacting on an object do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Comparh; h-r.woma3c e the sign of the work done by gravity whil .r-mwa 3hh;oce the ball goes up with the sign of the work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the crl5p)wedy: , 9uuei; wurve, on a Force versus position (F vs. x) graph, represents:ewdyiu5wp ,;eu 9lr)

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 rep.)13d2lyrtpzyz gcs;zd7 pgdyp;n,1resents the work done by the fp,t; z y.c3dz1y1s rngpypddz g2);l7orce 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 p 2g6xr-bxll,k ositive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then t8ge7j:d . i5bk5+a)ybiqtphs,rz3tthe object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zeru/*k:-np /aqzqwqnfy (rx1 v8 o, 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 twit ( gb2vuic1,77q bqdgce the speed of the car. Which statement is true about the truck's kinetic energy compare d 71q,uc2i(q bb7gtgvd 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 gc*rs, xvq. )was car K, and car J has half the mass of car K. The kinetic energy of car J, compared ws )c,r*vgxq. 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 speeb dldt4td1o5f6qz + g4d. What is the ratio of the final kldf6+ b4oz4d 1qdt gt5inetic 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 of 5 m/ e h5gw oz 0d1-ih/r)wk4yhs;os. If both objects have the same kinetic energy, wr0hgo -o hk y)i;1/z4edhsw5what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving with speeagz z sf(t,jx9fs,q1h5 w1c9h d 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which obf 1 ( j 9t5w,sqz9gxf,hcz1ashject 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 ce5,eyk .n0/3l hhs nczqrtain distance on a straight, level road. If you had been traveling twice as fast, what distance would thql.z0 hkn,nc/h3 y 5ese 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 orbih -4 h8ui;fuzdts the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic ene4ihh dzuu8f; -rgy?

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-energyuai o( ucg27*ti xgu -a.)ph*t5yrr5l principle.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

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

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

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have neg asu.j(t q:o8f(jxolbn;r ;3s ative 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 ri 6wnht3(hr4iw4/; hy/cx9:tmqra utest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared 9h/h :4hm4tniu3w/w(qyat c; rr xt6ito 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 nfvf5 )oxt4, dend of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is a )do4f,fnx tv5dded 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 of a systyikh s51p c77hem

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. Comparqhsiq3 b/ e)n8z0(c8*qwqlihe its kinetic energy K, to its potential energy U)s nz8cqb/*hl 8w0qqq ie3i h(.

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 hill.ah twag + h3zvk;(+sj2

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal speedetdeowjn/1q iv2+5 qqadk 3 ,jsl8 j+(s along a level frictionles,3 l/jd5jw8 eqiv kn jde1q2atsq+(o+s 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 +.g-jhc1; mwa1/cyzbpf1br q $m_{1}$ 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 ofd :l2 2p8tibjm conservation of mechanical energy for conservative forces.b:2ptd2 8im jl

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 thefx t4vy-z wssrc5+ 4*7hj wz:i top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking y7sr hzsi5*c+tw z4fvx4j:-w 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 dishcaf5*r,jmtpdrq r8 93:olp4 7c()n xf fec/ itance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potentia5)(q r: ,ixo4jtlafrc8/e* pnrc97hpf3c dmfl 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 gr j0a8 ix 8z/9lvgip*fbavitational potential energy. Do not ignore air resistance. How much kinetic energy did thbipv/9*gli0 xzf8 j8ae 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 e-/zm), v;)p pa hxa89 2zuakpzxs4nbwnergy.

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 kolgd o zjn;ll-2;t/*

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 exj7 q3d eh ;tg0 ; ix tj2jlliymz/s74r8wk*w4xpressed 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 not9cpilof c(1x ) a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work i o b pa14 e/ni.ty3lk7p:yt2mz,ih8uen one-third the time. To do so, your power output must haveen1y,il.i7t:zpuh2a8ye ptm 4/b k o3 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 achfd 4f(c.v834aqi:oh2hz; 5yas x ryv celeration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If thl1ck-gs 9f 53l twub.pe object weighs 90 N, how mucgtc w.1k9p lls53fu b-h 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 2egoyju62kuofx09lgg m:j :u tp 0 4u1up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work dog 02 :mg0okfo1tg4l p69ux2u ujjyeu:ne 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 withc.nfd tm+.z.qo udg )) a constant force of 5500 N for a distance of 50.0 m. What is the wo ..t )dnm+g.fd) uqzcork 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 constant force of 5500 N f9/bp djci50 tuor a distance of 50.0 m. What is the work done by the weight of/c 5jd0u iptb9 the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for/p-./2gv kv yj(tiden/:v i pr a distance of 50.0 m. What is the net work doik:2pyi// t.envvvr-p d( gj/ne 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:un pf ,7plw*.6n ivjz up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m downh d5 iq+v/g 8sjmce/:uvb qy)3 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 nu2 0,qeivn)d a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle v)ni 0,nuq2deof $37^{\circ}$ 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-3 qzcq vcrz,xn 7-/bf. The graph in Fig. 6-1 shows the force versus the objectvx3-n7f,z/qc qb- zrc'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 in gizq v.l3j. 4bFig. 6-1 shows the force versus the 3.v4q.zl jgibobject'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 forapgr)6.q ( f4x xw w4e,tbaw3o(am a)tce. The graph in Fig. 6-1 shows the force versus the obg.4t )r3mobw)txq,wef(ap46a aw ax(ject's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. ;;e: hq(q dazpyxbfmiz,4p5ij p43f )The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 3i4zafz 4eq)5p;dxjh (pq; im: ,fpyb 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 cua l3,pt:xazj z865xeq nd*8 a 55-kg cart (initially at rest) across a 10 m le,8x e8a36l :adxz 5ptzc*unjqvel 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 moven y/q(+xy /nj,vwu 8fz a 55-kg cart (initially at rest) across a 10 m level+ j nyxyw 8,nz/fu(/qv 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 wit:9h vk a:kzq6sh a speed of 5.0 m/s. How much work is required to stkhs 9ka6z:v:qop the 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 2s9yo5fgua( 1/1v9rvn geoe r.5 m/s, what distance is required to stop a carg5(v/ 1 vgosfu r9erone.ya19 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 10-g dart. It is cocked byj)tm(o1k 6ozka3i l7c exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assumin)3mic7o (zolka j1 k6tg 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 horizonvxm8 15,atlrw tal 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 res wxa8,trm5vl1 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 s*scsf( 0j6q63hp hnu ahot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping foahnju cs6 h36sq 0f(*prce 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 kk oe6 l2+h9jeof 7.00 m above a floor to a height of 13.0 m above the floor. What is the jhoee6+ k92kl 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 p8bl8 y44hxkj zlane. The plane is 4.0 m long and rises 2.0 m. If the plane is 8jz8b yk4h4x lfrictionless, 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 0gp 4 phj tx3ig powo+26ak/(rstretch 2.0 cm. What is the (p4/+2i0ogjga k wt3 pr6hxop spring 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 constant1kb65lc j3dnina,t, v of 60 N/m. How much potential energy does it stoj3l5ntc1i b6vna,d,k re, when 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 required to compress an initially uncompressed spri*m 5y;k:)xphtb d1 uwfu. - 2 9.xkrn7lynuirsng with a ry*nkk5l-xw9msrp h7ib: xn.; .du tu12y)uf spring 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.*5x y-qfqwys,c c bu, of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the uncf.q -qs bx,5 yuc*,wystretched 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 conprd5us 505 fatstant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an addit55a f5r0tp usdional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. What is the o6iif/hbs m+j/u dg66speed of the slier on reaching the bottom of the slopegih66f+oj/ 6u misb/ d? (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 initialhzc snoli rgv9* 8:7/r speed of 4.0 m/s. Neglecting friction, how fast will she be moving after l n7h*cr:8rsz9igv /odropping 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 inclinedhlx c1yel (h-c4(v(3q3mrzbk plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical h3hkre l ybc(mv(34x( 1qc l-zheight 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 fli-by/x +;igo3 orogxtzvi 9fv 4l:2 4xoor. When it is 0.70 m above the floor, its potential energy ex2 voi3t:4x/4gb xr+ xizif9;ovg- yloactly 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 0ft f6fi)qrhoe9 7ie/kinetic energy of 40 J. At the exact top of its trajectory, its total mechat76 /0ihfeq e9) irfofnical 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 f4 44d fbd-xukqq m/)bm leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its ki/) fk-4fmd 4bxdq 4bqunetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above:tl yoj9uk*p3 the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of ttj3 l9 op:uy*khe roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point r( svw:s-vw cyhca* 4p9 6s2zi45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what wz*y6 a2cpi(vv9scrs s 4:hw-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 30 m above the bottom of a dip with a speegwz.up6 nq.a; -wl2b ed of 25 m/s (See Fig. 6-2). Neglect ;l. n-.g6 2pzqbeauww friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its sw2;uco ;fkr( z wixe51+ryar4king (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 vertfduyacyh k; -wx- ch/wg4;7 h*/o/eigical axis and released from rest. What will be its speed ag 4 oyaidkx-c-/u;e ch;y/h/fwhg7*wt 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 2t7alyw +/8z tx5 m/s hits an initially uncompressed horizontal spring ww zxt7ty +al/8ith spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows dklzsx5o.81n v own her 2000 kg car to stop for a red light. Whato8 1kxs.n5vz l 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 force between a 60.0-kg object h xp*inv.ahqo ocu 18t377hq:and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what diah7oq3vx:7n qp h i*1c ho8.utstance 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 sc /7j sxih a(v+,co oa4qk:t8turface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 cs/:o8q ,v7th tca a k(j4x+ioN. 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 a y8d* c(zj+c8l ok9xw1g)xikonkf70 cpplied horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass w7d 0+c)cn89xkf8 og xyz1j(kk*lc ioand 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 of a 50-m high slope. If4ix,xjihu gu/39,v hp the work done by fricti,h uuxg/9v 3j4hxp i,ion 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 d:ti0m32u+r.m fm0; ejsxii +rkqsa :up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 320t ;ir+s00m :m2xmi3uq.+:erj fdika s0 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane incliestylo;r 5x1-g p o*,wned at 20e above horizontal. The coefficier5yl*egt o- w,po1;sxnt 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 4v)mrccas *rgy9r p( 6 i1gn;pwc2ep. from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What averynrwrg1c . 2*ip4p6vae c9gp)cr;sm (age 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 when he runs up a flight of stairssbwmmh :z-x:+c 9jmp y d:b75n 10.j5bnm:9 7 :m:zc +d-bypm xwsh0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity of 5te ,w vgng0n 8 ehe+.(urhx-a(.0 m/s. What power must be delivered to the object by t0 gxvhe(h8 ntur(a .e+ne-,w ghe 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 ener) jvv:o7yh24yh r9emagy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp ):v2v7oha 9 rh myey4j= 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 tho;5jes f/5xr):ph o phe rate of 500 W while riding. How much force does her foot push with whjfps oh5) x;rpho5 :e/en 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. Whaths qs;ind;+/na ,9,op j e9(dtpilh) g is the average power deliver;,9;,p()oajgndli qd th 9ns +p s/heied by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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