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

1#

What is the correct unit of work expressed in SI un3xa*90ggdl llits?

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 gk7;hq.k jcn;evc,9 his 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 amou9r/x d/m (.blw /e2iushj2az gnt of work yo/gaw j29/bzximl dr2ue(. / shu do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. How much w )q62 z/2behr;di3o7psregw4ra+ph work is being done in holding the box in this posit agpwi sb2+ 2) 3d4/;q7ezhprrhro w6eion?

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 fo*ea as.4cch -9fqq3f erward at a constant velocity carrying a 10-N objects3 efhec a q*qcfa-49., 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 )s,pr6cy3mpz5 dd9*jq qy : jc3.0 m then returned to its original position. If the total weight is 30 N, howpry,mc )p s96q 5zy3j djqd:*c 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 woha-3bpc,suez dq //,frk 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 straigh+;vyqq gvx/vnwd yxda;:5:,r t up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work dqg , rwy;vx ddva n;/5v+q:x:yone by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus pos-x,ewqvv5m/-ci.pwt m qjftk/ /,8ztition (F vs. x) graph, representsek,q8zc/t/ m-q5pj-tm f/vw.wtiv ,x

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 repre1e dz4unj44. qxg s6x jm;:1jkjqgzm3sents the work done by th z. jj ngud144 ;xm6 kmg:sqex41zj3jqe 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 in:(kf+ b ofu++8 m/m7rzo:knuhmjse8s 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, thx crq9z 4wqo 2l-xa3j)axt 2byh81ew)en the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, kq77co6-f (ojdm3 fah z(l ki9then 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 tse,wt,/j43oue*u ohmm b(:d is moving at twice the speed of the car. Which statement (o b4*teh:,jto 3swm,emu /d uis true about the truck's kinetic energy compared to that of the car?

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

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

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

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J ha gns tos(,(4ajs half the mass of car K. The kinetic energy of car J, compared toj,(stoan(g s 4 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 bounceminbh9 (3*o waw-lde ; ncr)h)s back with half of its original speed. What is the ratio of tww) );bn(l i 3-hc9*erhnadomhe final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is be+ lx5(eb56+bmabe j isw0m+ moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's ma(+l w5m+b6jim+exb 5ba0 seebss 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 )cxfh-fi+6ja. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which ffcx+j- i6) haobject 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 o k:*,6z rddu f+ceqxa(jl1dzs1h6h 5rn a stra+6,f u hcr5dx z*rhk16 zld:j1sqe(d aight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an ellipj xxvq +0)wr*obz:(gatical orbit. Neglecting any friction effects, what happens to the planet's kinetic w(o x)xg0avrb +jq:* zenergy?

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-energzuk,:gt vm*, dk c+hw6y 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 negative4)f; z .fygy.eic*vxp potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above the ground. A second objeuof1s 5n ft3)0;fyyurrfc(d - k07fnhct with four times the mass of the first if released from the same height. The potential energy of the second nkofyds;utun3 hfrc0075)r(1f y-ff 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 stre v:) zj 9uf*:577n v/k7bz t9e wanbw:fstfljotch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential jf9s: z/ob 7):v9zt* ae :fbu5nnwvkwj f77tlenergy 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 enertf 1u0lg2fsn2 gy 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).4szw ry ekt0(3m hvy its potential energy 4m0yhwvsy3 re)(tkz. U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up af)k2x 8ojkti, hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal spee 7 vjwc1s6 xyjxd9d1: x0*ts5r9xixpk ds along a level frictionless surface. They rdw91j 1j i0sxxx6d 7s5cxt* pk9v:xyboth 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 0 1/z6oq*iauh7gzc7rk(ufzf y 9xav 3$m_{1}$ 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 enehokpbxr )ljna4e :;26qg yt9:rgy for conservative forces;4a:b nhq6x gkt)yje9l2 po:r.

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, thrkbyvl 8lnf1ac0/*z 7p fm i,;eough the air (air friction is present), to the ground below. How does the kinetic e fmfl ,z*bc1a p87ynkv/il;0energy (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 distance and gains 30 J of kinetic energy.g1-4 g1-n+vpo bppdnq Do not ignore air resistance. How much gravitational potential g-pg 1n pnoqd1bv p4+-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 distr+t/vn jd +jlj7)p,fqance and loses 30 J of gravitational potential energy. Do not ignore air resistance. How dfq+vpt l, jjj+/7) rnmuch 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 energylcg/ p-7t: 5 zmh-r.mpu krd:j.

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)ko0i1yv6oblm/e e8srt n 7 m3gu cf.f71vj;k

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 uni2 :rnxw9sidl,6 x gch5+ub z4jts?

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 unit9 3ov; ihu)r/ypo 1syi of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in onew nikrei6u-smm z/ -j)fw;tfa93gr +3-third the time. To do so, your power output must hav rj ua -zi3nrt/wim;f-9kf 3) wgs6+mee been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car'sqj1, /hgkhmy , 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 object wezbc)fao: 9x ;tighs 90 N, how much work was done in lifting it? :zb9c)a; xfto

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 con blnvo2/ *)jvsstant velocity of 0.50 m/s. What is the work done by the weigbjsv/l2 no)v* ht of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 550 :cct-qwv+ p sq+f/4lpkk8+z m0 N for a distance of 50.0 m. What is the work done by the 5500 N ffcc8w+zvt k4l+mk -qpqs:/ +porce?

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 for a dwm1x n ;.azc(oistance of 50.0 m. What is the work done by the weight of tw; zam. (cnxo1he 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 a distanc: u7s5wfo7l/wno klq9e of 50.0 m. What is the net no 7k9l ow/fq7 5lwu:swork 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 3 q /y2cx,mp-w( zpoaiup 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 down a ramp, inclinvo ku4gdmx2k . (qcx20ed 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 Sarahwe;* b4qz; pwzpx/f /i in a sled on an icy surface (assume no friction), with a force of 60.0 N at an anpebzi/w ;pqfw ;z /4x*gle 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 obj7z aqetxxya5 .m;erk0v8e 7c ;ect in the direction of the force. The graph in Fig. 6-1 shows the force versus k a;.za 8;mce57ye7vxx0 qr tethe 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.f2 pbgd2dh gd r,zev+d wi9;7 direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obje2dwg+9b7g f z.;dh, drd2pivect 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 objgx-gyjtz:xp, c3m3uz ( ;c9g eect in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find t-ute:mc, (xz3 gjp zgg3c9;x yhe 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 *esro7 7 rgaa;direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the o; eas7r*ra7gobject 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 m2ije i 85cfto4ove a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic 4f2toiicj85 e 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-kgjyz*msmk1fzyn;*2 7s+mok ) m cart (initially at rest) across a 10 m level surface. What iss*)z27m;z1o snkfm*j+y yk m m the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speenh,pdtf+oa/i/z20lfbjt8k h / pb1i 2d of 5.0 m/s. How much work is required to sto2fh p ifl j1th kn/8t/a/ p2,dzbob+i0p 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 25 m/s, whaitt67,khad n6 an9 fe6t distance is required to stop a car nk9 dtf t,6a6n eh76iamoving 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 aadczpa nd kh 3r(jc)lp1j8/. * 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed wilh n1)p/.j*zdac3lc(8jp kr adl 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 hoy59 *kochm-lq ;wxs/q/i eu1krizontal component of 80 N and a vertical component of 60 N. The force is appl/um y*q/9kweh s1ck -oqilx;5ied to a box which rests on a level frictionless 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 horizontally into a bale ffju2w1gh,so x0 o9 ,fof hay, striking the hay with a velocity of 60 m/s. It penetra sguox0o2,h19,jf fwftes 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 above *2fy l:y -zg*t2t;gdh1xd kne a floor to a height of 13.0 m above the floor. What is the cha td y1n*glk2 2hd;e*-fytxz:gnge 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 long and risq) 2l 51rlm; v3nwj5a/wlp vaies 2.0 m. If the plane is frictionless, how much work waswl 3w)iplqv 25n1lm;5 aarv/ j 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 ed t5rzu,6og hq 7-*qm9vtk1qa spring, causes the spring to stretch 2.0 cm. What is the spring cons *zt6 r5dk -q1,tovueqq9hg m7tant?

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 potel5.f5 vcs.fbp4;u yc9,yni khntial energy does it store, when stretched cyp y,4v hi k9.fluf5bs;c.5nby 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 spring with,dy;xjah x4 9(t5rx nh a spring constant of 25 N/m by 10 cthjhy 49ndrx;5xx,(a m.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring consjw 5 )qbf1r5q(wm : mzldb7wk)tant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is atw1b:jfz q()wmk5 dlw)qmr b75 x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compresrar*3y: rv6rmsed by 3.0 cm. How much work is required to compress the v6r: mary3r*r 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 5zhqpyla d 2+6*m 5o:hb0-m high slope. What is the speed of the skh6q oya2 +bh l*d:pzm5ier on reaching the bottom of the slope? (neglect 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 initial v0m69wc; oepn:m iv y1qj,pz.speed of 4.0 m/s. Neglecting friction, how fast will she be moving after,;:j c6.pyoev mpnv wzm1qi0 9 dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictio+ h4fvnqtwu t ;b62c 3nro+z+pnless inclined plane. At the bottom, it has a speed of 9.80 m/s. What ivn;t++ b3w4t6 u cpzh fn+ro2qs 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 0.7z+oo81 2x- cf0/mtnrv5 b , r/mzcgipi0 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it tmb mpzi, rxvocc i/o8z2fn1/-r5+g0moving?

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, bla2k xm3 1c,pqmasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its traj km 2pacq3,1xmectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves )fegw eb(oyqhbu) -;x o5:zp,the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To ):uooxpyqfbh; ezg,b-e5 w)( 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 at8(m -9pyt zoe46nllzx a point 45 m above the bottom of a dip (Seez m4n-89z p (lytxo6le Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 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 abod- 8g d7l10p oj7nheyaqnr0l3ve the bottom of a dip (See Fig. 6-2). Neglect frinyq07odp al7 gelj 3 r-8hn01dction, 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 30 tu 46ghq f1x gvtgv7k,/oyq, -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 rolqg-o/ ,g t67tvfvkq,y4ux hg1ler 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 bal5e(co,a.trlgejj 9 3m l at the 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 0.19 m away from the vertical .fd65; tgb70sh egph yaxis and released from rest. What will be its speed at the bottom o0h fe5db.gg;y6psht7 f its swing?

A. 0.257 m/s

B. 0.686 m/s

C. 1.03 m/s

D. 0.857 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 an5n sa.yppv+p3 initially uncompressed horizontal spring with spring constant of nyv sp5+p3ap .$2.0 \times 10^6 \; N/m$. 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,poq1/kz )rnmm+i,jc+)ye l9z slows down her 2000 kg car to stop for a red light. What work is done by the friction force against thec9kjr/mqoi++z m)1, ye pln)z 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 a1fg-npu/fa x k:j 2clf.mf7b0 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will itmn :f.0-cjlx/ g21u7 akfbpff 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 surface. It has 24 J +.tx htoritg6g 1 p)z8of kinetic energy. The fric)+1oitxt6p gh.r gtz8tion 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 to a 2 ico8zic54:tp .0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. I8op 5i 4citz:cf 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 7- wf:q. jw*p;fuglvi top of a 50-m high slope. If the work done by- v.7q:wufjf p;g*l wi 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 inclined plane. The plane is 4.0 m long and risescs4 l.c;pk):j 1qdgs 1g y3jzf 2.0 m. It requires 3200 J of work to get the box to the top of the pla g;4 f :1c13kqz)l.scgjjpd ysne. 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 inclin8br5wvv8 -ln sx-d j*az* wuj.ed at 20e above horizontalvj -.jrba 5*w vzdu8*nw 8s-xl. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and sorb:( 60y vetwtrikes the ground with a velocity of 7.00 m/s. What average force of air friction(trbo0v:ey w6 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 6of0l6 yga wsdy5w9ju 56;waqof stairs 10.w9yw0fy 5w6 6ogld;q6a5saj u0-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 neededyb gnp: nw 6*/wx*qpv6qt75w z to move an object with a constant velocity of 5.0 m/s. What power must be delivered to thy /p56*z pxb:q7vgt qw6wnwn* e 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 ob-t.q:j.uog 6-t d ht hd;(pumotor that runs for 1.0 hr? (1 hp.. tgou bpuq: htdh;(o-jtd-6 = 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 tlc y i(v.wpfb1wwzk/.1 m a8l1he rate of 500 W while riding. How much force does her foot push with ww.klbwfi (1. pv1camwz1/ y8lhen she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is toe,jmdj j++rql62+u the average power delivered by+mu+tj2d6ejrl q+j , o the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95