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

1#

What is the correct unit of work expredp mll4 n6o*j9 su;gwy liquly;(( *3bssed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system * rs2l yn m 3fwol3y/3h+irl:cif there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount oq f)g58i; ibbq:y4jw qf work yoywibq)b4g;5:fji 8q qu 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 iplspz qwi 6/a50yu l64 *ayax7s being held there. How much work is bein/u0apis lqlw6y4 ap57x *az6yg 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 velocity carrynr;p 0nllm 3ix (mu9w+ing a 10-N object, the amount o0; iwp3m l9rl(nmn+x uf 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 re:mp 0vnzco)kt(5l :thturned to its original position. If the total weight is 30 N, ho::k p5vzmolc)( 0tnth w 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 ac5fa;/r )x,;ojy /ngjzdx2p fqting 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. Comparejjgxi+q7l 6ekcif+ 6: the sign of the work done by gravity while tkg qxjfje6:ci+7 l6+ihe 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 curve, on a Fa9pq )h.7cegh orce versus position (F vs. x) graph, represents.hcah 7pg 9)eq

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 veret.49y1zj8 nf(u5sls9qi/ f+chly l n sus position (F vs. x), what represents the work done by the foq4 5 t9c 9yhf8ijnzel(lyusn+lf s ./1rce F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kinet/ )+nlch6c01hkz wuzgll-d2aic 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 kinetic en 9 c2 )6404 hmevln(v/xxcj u6svlehpaergy

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 6 h (n.m kp8n,7eig9umu *fhq1cctip.an object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving atkjj9dh:9efjk*c :/femmg p*7 twice the speed of the car. Which statement is/hgj*ff *ec:: p 7k9dkejmmj 9 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 has half the mass of ca(k+ao (v+krfar K. The kinetic e(+ ar(+kfokv anergy 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 originae2ctxu x /a7u1scz nbee2 7)zqju4//fl speed. What is the ratio of the final kinetic energy to the initial kinetic enes xc1b 2ez/27e/qujfcn7azu)/ x 4uet rgy?

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 movif (r0 cpdk7ln; ;+d,fjqay )oeng at a speed of 5 m/s. If both objects have the same kinetic energy, wha(nrpjqo+7,l; y fc d);ea 0kfdt 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 w*,.kiw webvo9 lb4;)v0 laa k,-guu4lb5zet uith speed 2.0 m/s. 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 otg,u4ela b;a0kv5 , *lu)l-wzbv9.bokw e4 ui bject 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 dioa i.6 sb5:nmastance on a straight, level road. If you had been traveling twice as fast, what distance would the car have s6b5aomai sn :.kidded, 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 orbiq0w)v k z7uh2gts the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the pl0z 2 kvg)hquw7anet'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 prt; *t)ildf 0asinciple.

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 uo(61oqw0f.s)f)wm hae n hw7system to have negative 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 hx ystk94do 3bd +*7rereight h above the ground. A second object with four times the mass of the first if released from the same height. The potential energyro*dtsek4 ydr+x9 73b of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to soh9dktq+9j 2 u z(:ugrtretch 5.0 cm. If another 0.200-kg mass is added to the springqh :t(9grd +92jzouuk, 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 s77hrm8 ee1kyx ystem

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 enee (c :ov*5axrbrgy (: bx evc5roa*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 k,qj6h . 4s dxws,mjxd1j3p zbm3wy6: a car driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are slidineh 1.1+ xzann3xlig5lg with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?x5 i x1e.nzlh+a gl31n

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 .xd( r/bk6 wew$m_{1}$ 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 conse q (h*htc76czcyxv+0 crvation of mechanical energy for conservative forces. q 6*vc(zht+0 y7hccxc

该题自我估分: (必填) (满分:1.0分)

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building, through the air (air frictionz v1i nvfrligtw:/7*a1 1-scn is present), to the ground below. How does the kinetic enc 11nr1n*vzv7:l - i/gifwa stergy (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 distanc6p phj00zr/hs6mlb ,h e and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitati 6hhm pz,/rpljs06bh0 onal potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational potential energy. D6x bwum jm;k(8e- ir( fy)cz9p sn*;pno not ignore air resistance. Howmf)u(68y -rc ksiwm( j;n*;xb pe9pzn much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of energy1lr;krzz mg*6cf 3tlv3,ce9z.

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:580yvpa bgyw. q-pog

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 ofyp6 x99oek7(b(lno dt power expressed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of p0x -iu./hnfd fower?

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 one-third the time0di:3 wljje)b . To do so, your power output must have bdwil03j)jb :eeen

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 accelerbjj2.o/0z+ o fb-gyp sao0) voation, 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 object wei6+.ly,. -wq-6etwmi oe jwuspghs 90 N, how much workwo- .6te6ui.p we,my wj-q+sl 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 up in the air a distance of 1.0 m, at a consta. 93m:dw .0 objbrabad.pmll)nt velocity of 0.50 m/s. What is the work done by the weight of the booklramo .bd.:a mb0w j9 )bl.3dp?

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 condu- h.4 :0gaxk+.pelje(d *ct jv4cm fstant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N le(jgxjudd*hm4 t+ :0 -ac4.vcek. fpforce?

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 opf q 2itt8k k1z;ohc9w ;40xb5500 N for a distance of 50.0 m. What is the work done by the wei;w8x ;t q zoi92okt01bk fc4hpght 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 a0mmmygi, g, 0xz91f r+hcku4x constant force of 5500 N for a distance of 50.0 m. What is the nzgxm g4y0f9 ,+k1xruh0cim , met work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up au)icqlwj+q 5/long 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 do c cxqng;89)hm* dcap4wn 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 on an icy surface (assume no friycr m k6+c(fz(rn0z4l ctionznc4rk lm6+ c(f(z0yr), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the dis2 xqw* n.-5hiu.gcahrection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fini2 uq.5nh.cxw-a*sgh d 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. The1cpnh o-.ve3r graph in Fig. 6-1 shows the force versus the o .h-np1 ercv3object'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 ,70+jyii2(qff gvk+hmi4,lh x8ugaw direction of the force. The graph in Fig. 6-1 shows the force versus the obje+xauylg2m ,g( i78iwhhk0+ jqf, 4fivct'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. (qd t;7trkowooy k 7j( jr;t;:6-1 shows the force versus the object's position. Find the work done wheny;k;(tro qk dot j 77jo;:(wtr 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 c,x/g rj.k7onvart (initially at rest) across a 10 m level surface. What is tjnx,vg 7.r/ kohe 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 fn0a. a8w2 +eflubai6N is applied to move a 55-kg cart (initially at rest) across a 12u0i 6nl.aaawff8eb+0 m level surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0l s d19yg+4(1ad0o jcd.p mqhk m/s. How much work is required to stop the m +cj1dl msd0pa.y(4q1kg9d ohass?

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 initiallyeu,;+w+b6ms pce 1 n)4h*twtpnuiqr+ moving at 25 m/s, what distance is required to stop a car moving at 50 m/ssrpth1 we4 be,p*w+;nimtunucq+) + 6 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 cockedp6 6rz0ppjpt* by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leap pjp* zpr60t6ve 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 807om gcq+fac0 0 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. 7+a00occ fgmq 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 of hay, striking the hay5n:u l)7rdbuk-spto:,nl.q h with a velo :rn)lsu5u:p,kn7 -qbd h.o tlcity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m j*e -fvf/ylu m re9:8kabove a floor to a height of 13.0 m above the floor. What is the change in : 9v ku-y* /erl8fejfmgravitational 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 pushegm0q1yz,l kbkmo 97g:d up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was don9lg ok7qbz0k1 m gy:,me 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 stretch 2.0 , r9 ou5dtt:b3u7tsc8 mspjlm9c3wc7 cm. What is the spring constant?79j5mbm38t9ltu sostc pw:uc r,cd 73

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 of94ere y3 zq smm9v(3kf 60 N/m. How much potential energy does it store,fk (q39ser9 yv4m3zem 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 r/en9apwh*bzx9py,rtrez 8 9- equired to compress an initially uncompressed spring with a spring constant of 25 N/m byex9w /h9t zr apz9n b-re8y*,p 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 vd *,jwrvt(y0 of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched positdvy0jr(,v* wt ion 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/m is initially compressed by 3.08tk-mh5ico,xro mpw 4, 5jga ( cm. How much work is required to compress the sprinha,kx5o - orm m,it4cwgpj8(5g an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. What is the sxw 2bvq1w ba2( yvp(t( jd ;krm+z2,dzpeed of the slier on reaching the bottom of the slope? (Neglect fric(qz(+ y b(dwa;t v2wdrk2mz,vj x21p btion.)

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 e;wfm4 0uq m7xthe top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropmfe 7q ;40mxwuping 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 vu ,wer:.f5wfisbwm9- 5k;v qfrictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the pl s vwvw59b u:5,rqek.iw- ;ffmane?

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 floj c (dly6 qjivydqx1fz992 */wor, its potential energy exactly equals its kinetic e9 2yjzj i*fc/9 dqlv 1xwyd6q(nergy. 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 gro9 qa214 k hfzj*jzz)wgund 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 heia)jg4kqhf wj z*1 zz29ght 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 l wcu-51a(ytms eaves the ground with a kinetic energy of 220 J. At the highest pwcym-1au ts (5oint in its trajectory, its kinetic 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 the zsk38pusg(e s2oan 4x,s+v1 b bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster a4 3so n,s8vug(ps1b2se azkx+t 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 spee;vw t9.tobi/kd of 5.0 m/s 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 m above the bottom of t/.o it bvwt9k;he 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*7k t2ba xtv)oh 3-owz(wwl y-i5/gja 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 a7zoy-gl t v /w)5ko(-2 awhj*3tbixw 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 o0q) 2r ngl2gqiu lk0x23i.ty jf the ball 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 pendulum of length 50 cmcb p( wq)m8g:,q* vxz:vd4zfd is pulled 30 cm away from the vertical axis and released from rest. What will be its(ddz:f,) c 4vzbpxqw*8v :g qm speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed r mun1 9pjy3;ku 97vaj0f j(uahorizontal spring wu av(n0u rjjk1au3 9mpjy;97 fith 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 2000 kg 53d a5ol; qm*sp*hwua u3 xex*cev7/mcar to stop for a red light. What work is done by the friction forch/sx3xap dmw* u35 oa; eqve7u*cm*l5 e 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 and a hofd 1j4u7 :fcpj7vm9a yrizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what diu :jyp14mjfv9dc7 a7 fstance 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 surface. It has 24 J of kb 1x s:uq33bdxinetic energy. The frict:313xxbsqu dbion 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 i,; fmhy r0ik4a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass y,rk;fh0 mii4 and 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 hv 3os7g:+vi 1kw4 /mdnfdlzon :h a2s9igh slope. If the work done by frictio hdozd3sn:1 9n+ 4g am 2vkswo:/7vfiln is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 32*g1stt :n4w( n 6vozvcvfdo m long and rises 2.0 m. It requires 3200 J of work t tn:v4wvdns 3fvz6*o tgc(o12o get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20e,+ik6ov bk/ qu d9:jgk above horizontal. The coefficient of kinetic frictiod k+kugjk 9 i6,qvo:/bn 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 sc0vuh2xnsm:1en bf x8 nnj1-) c+oa k;trikes the ground with a velocity of)2 8hj; ns-u vcmfncknab1eox0 :+1 xn 7.00 m/s. What average 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 j r cri-id3g s823f,jip.6 syeusing energy when he runs up a flight of stairs 10.02i g.i8depr 3s-6fysjrci3 j ,-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 obje0cn6mz05 g -rjvpp :wbzan.l4 ct with a constant velocity of 5.0 m/s. What power must be delivered to the object by the fl-j mpzp00nz6ng . 4avw5bc :rorce?

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 taynh y9uo*q(0c 68dihr? (1 hp = 746 d8y*q huoncaty9i 06(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 the rate of 500 W while riding. How mq sg0/75pjdhm d8z,f) runft,uch force does her foot push with when she is traveling at 8.0 m/ss,p/ rdf5)gjdm 7q,fzu08t h n?

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 16i +jlr, ufd ogr9,jrk 5kt(iaverage power delivered by the engine? (1tl jg+okk (irfrrj u56 d1,i9, hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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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