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

1#

What is the correct unit of work expressed iz0::zh .ryd5dsx d,fmghi ( cmq1l b;4n 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 system if there is no motio ( 8+ssrhwj;rxn?

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 bric4pgh:1lu c 6qlcokpo5kgg5/ z+n+hv; k wall, the amount of work you nu45/6 k;lpo+opq zlgc1h +5 :gvhkcgdo

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. :3zxejnkkzu5/ n 2)awhyy s-;How much work is beine5/nz2z- xy yj;sk)u:k h3wang done in holding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocit( dyx/o0vq1ef y carrying a 10-N object, the amo0y e dv/q(1oxfunt 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 returned to its origp d*y.ifiyq3vx :ro4 mkf5e40inal positi f xqro5i e.4ykm4dfp:vi 30y*on. If the 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 acting on an object do worlgeqt q7f0d.ww v l9gm01ur**bz.3ee2 sv(bik 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 workgt-lyf-;4.p)/k s lwvs 6 cbyp jw:-mt done by gravity while the ball goes up with the sign of the work done by gravity whilw6---c g ssmfjy)pvkp.lwybt;4 /t:le it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) grapn v6aat f -3z n5iv:*vijl-p4vh, representspazjn-vf*v v64:a5it v-i3 ln

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 represenys 18h5rc,7m2 acln xxts the work done by the folhxxyr72 ,a mc8c51ns rce 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 ( +bk3pe2dcra. d 7v:.q.gqvkeag j,don an object is positive, 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 the object's b uwt :2)nbrm9yhhh.4 kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kineta 8qhp1d 6gqy)m0(wum ic 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 movinm d-v-evr,b 7me4j v+bau4 k(qg at twice the speed of the car. Which statement is true about the truck's kinetic ene-v4barm j+evemu( q-7,k b4 vdrgy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast asr4,rjd1a.vvbx.tj up c ;*f.i car K, and car J has half the mass of car K. The kinetic ei..r fd vj pj;1rxv4a*b.ctu,nergy of car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of its original speed. What ijt kd x.27w7tks the rak.td 7wk 7tj2xtio of the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3q ln3m+ qfe(kk0 p)c/h m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the ro h kkqnq/()0fc3+lmpe ck'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 movingi g:tq*n,bhpfeb z48h- nv /n7 with speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objectn *e v-pg :b4i, nfz/hn7th8qbs 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 j(fth0b+qa c 3ialuk0ld x0+hx4/+ g son a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?0/ +a03bihlj4gshqcdtx(+xl+ 0auk f

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. d +0do simna- dk3p)-uNeglecting any friction effects, wduan 0d 3)-mok p+-dsihat 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 princi71.klxdie m.f ple.

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 negatyz p)1shj8 qd9 wc1wd9ive 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 re oi1;ra 1mxucw*:irp r5al0:jst a height h above the ground. A second object with four timea1 :piiaj1;o0rw lx*u5cr:r ms the mass of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end o 2 g7sujr1w;vlf a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potentiargs7uw;v l12 jl 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 mechanicalk,zt wfh *9 s v;d:zj:b7 tgqc:oofbao1 z8,2h 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 energy K, to its potential eo*k8n2 rldxt coe+28p; w0wjfnergy t+cr8 e nd;w 2*o fklwjop8x02U.

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 hil8av1jn xg :b(fl.

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 aq et-fwq/f ro.8bua-8 very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. w--ofbq8fu 8 e.tarq/ 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 z si+hg)uwly,5.7nf p $m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conserg77.*u 5vz9y t upewxqvative forces up7 *zuqxevy7gw t.95.

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 topozej;x8gu, 91fg, -(a haqno e of a building, through the air (air friction is present), to the ground below. How does the kinetic eneea 9fgq x8jan;o(uog,1 h,-z ergy (K) just before 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 disteebbq1d*-w hkvis (. /ance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the b1./ (b eqekdbw-v* ishall 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-uugp2 k xck5 2 )amm2b4n5w c*rud6nbavitational potential energy. Do not ignore air resistance. How much kinetiu 25m5d-nc*ur macnkpx4gw622kbu b)c 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 oftb9qa1 ou25 ax 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 isd.a 1,nc *-skrcrp5 zn

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 q q/5i .6bqcqsunits?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a un (eg)kevtu :uby/y9 -bit 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 .cwvihyb7 .( gfb*k7uin one-third the time. To do so, your power output mbiy( bh7vu.cf.w 7kg*ust 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 au.o.ni d l/n1p constant acceleration, 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 the objevn l /9wk,12 gjq0ucgbct weighs 90 N, how much work was dow0b 9 j/,vn1c2l ugkqgne in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a conn j0e/lk5) yit/psbx*6kpq ;estant velocity of 0.50 m/s. What is the wo kxk ep/b; i* 0sye/t5j)6nlqprk done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a const(fi 30a.mpjiks6rn:d8ps(4r yn-pg gant force of 5500 N for a distance of 50.0 m. What is the work done by the 550i6 sdr(yis -p(jk. gag:n4pfp8 n3r m00 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 constantd/in kb u4.gjxap3lba(02 8ixo3. hgs force of 5500 N for a distance of 50.0 m. What is the work done bsb2( bgd x4 j.hk/lpagoi83 a3i0xnu.y 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 5nr8pfkly47 gconstant force of 5500 N for a distancrnpl475kg 8fy e of 50.0 m. 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 u+xi ri3ggk)2 t7zga+np 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 slidejf)nmx8 t v0u65spq :os 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 sled onaf2 9xv, i/jznto5wb2 an icy surface (assume no friction), with a force of 60.0 N at an angle x9/ wonj z v2fi2a5tb,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 a1rse *0 bj,xoeo3m)cxxoh1-3 y (ikt in the direction of the force. The graph in Fig. 6-1 shows the rc0xaboxo j3e-*e,1mx h)os ( k31i tyforce versus 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 object in the direction of the force. The graph in Fig. 6-. 8fsfm2setgrr4 lpcgv8: ;w7 95cwsr 1 shows the force versus the object's position. Find tlvtcm s887srf5 9rg4w g:.sf ;ercp2whe 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 tkr.7kmvhij+k:x ni)2 he direction of the force. The graph in Fig. 6-1 shows the forck:v2)7mri+ kkin jx.he versus the object'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. The graph in Fig. 6-1 sp4/znf h hr ru4p6nygf6-(iq1 hows the force versus the objectf 1r6pnz( y4n-46q ugh/h frpi's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg carf4. 4of gub- ,c78d/awmojyqvt (initially at rest) across a 10 m level surface.o47g f.mja-yo/q wf,8u cbvd 4 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 s )/9gc(mfdggxvhy+;pw8(m h a 55-kg cart (initially at rest) across a 10 m level surface. What is the /wgyg)m+cmp(f 98d( hh svxg;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 *s5muy)w e 92aquroc(with a speed of 5.0 m/s. How much work is required to stop the mass?(rec u2 )m qyousw*a95

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what distance is sks( (occ.2tl required to stop.(l okc(t2sc s 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 10-g dart. It is cocked by exerting cr 4- gmjbp/35nqsst joy:86r a force of 20 N over a distance of 5.0 cm. With what speed /j6no:35s ybpr4 rsgq-j t8mcwill 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 componentp)uuy)*d qq+ f of 60 N. The force is applied to a box which rests on a level frict*p)) dyuquf+q ionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horsyvnruw. o s7k -sn1(w bxu78 t3wl vp):wjz+6izontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a dep+ws wrjp6yu 7w31 v8b:(ws7vnz-x kn.lut o)sth 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 zgbx55t6i6/9 2h q -jfwjvmv hmoved from a height of 7.00 m above a floor to a height of 13.0 m above 6q 5jxmjf2 z5 9wi-vg/6hhvbtthe floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m 0htu6yn 5gtc;)k f9aclong and rises 2.0 m. If the plane is h)f596 cagn;tty kcu0frictionless, 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 i,m8e jj5mzl1 di03 iaobl 6-yto stretch 2.0 cm. What is the spring5m-,16z0 baji ili3 oy ml8jed 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/ rv 8152n2skbrrzzs *icuv e6-m. How much potential enkic1 zvn 82sev-z* bs 52rrur6ergy does it store, 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 uncompre i+32dxsn8zgr ssed spring with a spring constant x8rnd 3g2+izsof 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 am:7 csbmbw7t41 :fgbh)pn2 oj m,z-tw spring of spring constant 40 N/m from x = 0.20 m to 0.25 m- b,zntsbbgm f:pwt w c m7mj:o72)14h? (Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/me a*qdpd3c4r. is initially compressed by 3.0 cm. How much work is requireqr dad pc*e.34d to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from f 9)jv 5qpr9ng(-yigigi wd3;the top of a 50-m high slope. What is the speed of the skier on reaching the bottom of the slope? (nif)d-p5( v9g 93rw gii;qjygneglect 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 with an ine p4bgpkv jy)2iu 9o9 e 0.*cf4ejgm2nitial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after droppingpek9pycb0m g) i292 4j.j e*ogenuvf4 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 h*p jbel.k 5w 7 wm/4xdls28sldas a speed of 9.80 m/s. What is the vertical 5llkwd24 exbmjd*swp7l./ 8 s 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 por7:.b nxn sfk0/zoc:gr +a sg9u8 4dvztential energy exactly equals its kinetic energy. How fast is it.znkg: sx09r 8c4+u/ sf rd:a 7nzvbog 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, b3 lp-h 2nyobw1 i8hc)ilasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical heib821i)nio3 hhcy-lpw ght 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 2k2cf/1 8du wwk20 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, dikdwuc f/2k18 wd 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 restky5 x l6o5m ipqc9ay;. at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 6x;5m kqyc95.iopy la 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 4il*tm*0a e:(um uu;r o5 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the0*iae*m u(utr:o; ul m 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 speed gh*n-9 7dkoauof 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at t9d ahonguk*7- he 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/ c...b. 3zdqolm gotw 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 0.26 m away f3o-z pz:7vv7cowi;kydxm2yb (/4v r j rom the vertical axis and released from rest. What wilw/zi po jbv c74d2ymyoxv v:z-;3rk7(l be its speed at the bottom of its swing?

A. 0.3586 m/s

B. 0.956 m/s

C. 1.435 m/s

D. 1.196 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 uncompressed horizontal+eony8+t b t;yx1.trp spring wite8n. ptbt1;+yx+rto yh 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 down her 2ivo qqa9mf)n3o jj 6n*17 uvz bgrx y.)en+(m6000 kg car to stop for a red light. What work is done by the friction force again 1(.y qe zjvgabo)nuomm nrn367f vi*q9j6x)+st 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 forjr b i4/o1a4jjqo.s,dce between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object isa4j i j.sbr4,1o/qjdo 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, level suky /o8z-o cko8rface. It has 24 J of kinetic enerykok z8-/oco8gy. The friction force on it is a constant 0.50 N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally t *z: budhy-vp0o a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the massv :0 -u*bphyzd 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 to61hj -s, wvxjop of a 50-m high slope. If the work done bj 16j-x ,wsovhy friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclijneod-1gj88f/ fy e/i wmw;q+ned plane. The plane is 4.0 m long and rises 2.0 m. w/ye/d-jn8w fofg + ij;m8q 1eIt requires 3200 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 jwlv:s:0(zr k l6we,dof a plane inclined at 20e above horizontal. The coefficient of kinetic :d z(6re:0 ,wlkjsvlwfriction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 1 hzkk7 0(5dlnrsvh5 p10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force ofdvnlsk(zkpr057h51h 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 ofy gq so;+5ne .lv34jiip*9o*er3fnca stairs 10.0-m high, leqj * g9 i3oy;oae+p3fri54 v*nc.s nin
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 coaxx 40 hx;txm3nstant velocity of 5.0 m/s. What power must be deliveredm3x 0x xh4tax; to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (1fnet ctj (b6nr.(b4y/ hp = 746 W)j(46n/yb t(enbft .cr

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How much fpa-z;ap91h gk6g5rhmorce does her foot push with when she is akh9rppmg61gh ;-z a5traveling 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 average power*iy5s1j0sc9 wbq:u: wrq z hp7 delivered by the engiz* puwsq:w59ciy7q1hb 0rs:j ne? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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