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

1#

What is the correct un 4,7rd.73+sugtmj ocv y2zlx n*sd9gsit of work expressed 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 systeo bptee*q * 7yh85.nhry)rn1zm if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard agsic, zr.*;6xpqmml.i8zss +i ainst a stationary brick wall, the amount of work your z,ip.+.ms 6zms8ii c*;l qxs 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 2.0k conuyzff+3 /)o-e8g m vertically and is being held there. How much work is being done u 8 + ky)-f3gfoz/ocnein 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 forwar 3e p f2 sv) n/ev).g;mmnmjuo+*h0ynjd at a constant velocity carrying a 10-N object, the)m u ;e3j+2*n)/mh pg.mo ysnvj0env f amount of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to its original poky3 -2mh)u4hua xrs*y sition. If the total weight3h 4kaus x*)myuy 2r-h 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 ob5 xd(*o:eeu suject do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the wh.f+ueuyj0mwxdvo :jo 8ll; h *0-;yiork done by gravity while the ball goes up with thevxeoj+d 0*;uomhi.u- j0ly;fh l:yw8 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 Force versus position (F mrt6g1m k(do-,y6oehi yos/6 vs. x) graph, representsmto-s /imorh666dg o(ke yy,1

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the work done bye)dfx.,s*82 -dcb 8lwilcyjn the force-l88ein sjdc2 ,w yx*)f.c bld 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 onbp/)o6 -k4tks qpo :wy)xw4t/ n grz7q 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 kineeuoni 1vxnv s ,/x)b43tic 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 objectn8me o *niv30o is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the spk2t*ehn p g3vib9*u.ho +hl2f eed of the car. Which statement is true about the truck+kb hvgl 2 p.9 ue*nh2tihf*o3'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 ca /mb0ml.z+9c1cliza br J has half the mass of car K. The kinetic energy of car J, compared to caibb ma zz ./9l10m+clcr 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 andnb2yuf )mggktm ehk/ 1)r d,1: bounces back with half of its original speed. What is the ratio of the final kinetic energy to the int)1kgu 1emh,fby) dmrn2: g/kitial 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 pebe(:bgtb/o db r32ew *k1 tc0ieble is moving at a speed of 5 m/s. If both objects have the same kineti g/(t rbecoie3t e*:0db2b1k wc energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is movinjkix9ckay83 w4:-dp,db - y udg with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Whiccd 3kky,py wbu:-xd8 4d-ai9j h 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 .0briq03v hbyzjmkvks. e62d33 w t;j a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, wd 3y. hm.r;t6 02z0jvvbqbsj3k eki3under 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 yu ;ury.sw;:w;fk 5tqthe Sun in an elliptical orbit. Neglecting any friction efsryuwqwf:; y.5 tku ;;fects, what 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 principd/nk -99utea a vr+:mvle.

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 negative1 ae9q /k yftd.kwz(1a 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 restw9s9i0bq +e nr:nomvpx k250 y a height h above the ground. A second object with four times the mass of the first if released from the same height. The pote0yiq b 9rn:vsn 50xpeom9 2+kwntial 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 , 3vt8kp13j xjvzg ip4the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring tv j1pixk48pgzv,j33 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 systef+6dc6ddjon+ i::2/o y2p(hybw 3ugfb qgbo -m

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 kso wi,2 p1 h1n+u5nzerinetic energy K, to its potential energy U.+h ew1 n,oz 1ri5pns2u

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 hill3)4q ank hvo1e.

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 heavybu i6,8aybnpfr 9zq (/ object are sliding with equal speeds along a level frictionless surface. Thb,au zb6qip( /rf n98yey both slide up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses :hbooblvqr 0l f. 4:enw3-) ov$m_{1}$ 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 conservative forcesl+yk) krf9+ * tc1 s .68pbbgnyumf,yi* plk m6bfcku+bn1y89.,+ frts )gyyi.

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 buildkn)1: pgnb9yling, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the bui)nk9: 1pyngbl lding?

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. Dojf-ervq88q g :4 9f m3qtmeuj(aokv08 not ignore air resistance. How much gravitational potential energy did the ball lo:9t0 g- vkej e84vqqmq aomj83(rf8f use?

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 distancedipol8ma7t 2 /x4 wpd) and loses 30 J of gravitational potential energy. Do not ignore air resistance. How mi otwl/mad78dx4pp2 )uch 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 energzz c5csz9bvb(jv + e/:yb49pgy.

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 ncro nc5j04y98z 55txoz fd(v

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 units?8a i+3y)icehf

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 9(;6wb/ps w,i/qo)inm lclg. m- d oerof 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 onlua o.:70/xphtrd m4l e-third the time. To do so, y.7h m:xt lo4lpdr /u0aour power output must have been

A. the same as yesterday's power output.

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

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car atu 9.zfw 3d7lmg:6suwi a 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 ue93 uvaja04 i2.0 m and held there. If the object weighs 90 N, how muu9ui43a0 a vjech work was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a diste rgh(. ak2 ctq6ge-z:ance of 1.0 m, at a constant velocity of 0.50 m/s. 6q-gzk2t .: egr (ceha What is the work 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 constant force of 5500 N for a o8zya 3cnfu (lr e:0hoyd3 2k:distance of r33y cuhl yken o2:f0a(8zod: 50.0 m. What is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a7hiiy +5bkjto qd4c)yhaj,hv *8f *.v distance of 50.0 m. What is the work5yhqvy8id f*ith4. b+jc )v, kjo7ah* done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulle(sd t1vd*9m)p tqv0tid upward with a constant force of 5500 N for a distance of 50.0 dq0td)(1t vpvms9 ti*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 js3 o.k juq,c(up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp, inclined at 5k .ts,xamfes f1o4ho/;e;m l $30^{\circ}$ 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 friw g,vd9nwl8s2 ti;o4fction), with a fos9gwlvi8fw4 dn,o ; t2rce 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 direct)simttdzl /j j +fv8.xnh;+f;ion of the force. The graph in Fig. 6-1 showfmfx v8l+h;jj)/sin.;d+tt z s the force 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 direc15lom 35vq; v anezaf0tion of the force. The graph in Fig. 6-1 shows the force versus the ;vla01evmq5n a35zfo object'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 th-en, cbvtvrxgjwt .5,3 1)hck4wg7tj e direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the 1x4- ec,vr t,gntw bjt.3jcw7)kgh5vwork 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 th rb knz15 z;0xkhc57 lxa9itm4e direction of the force. The graph in Fig. 6-1 shows the force versus tr0c m5ilka7k9 nzz;bh14t x5x he object'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 i.4o7wa)nwdeeg; gf tb ojt:/; s applied to move a 55-kg cart (initially at rest) across4 tefa7)t;w o: /n j.dbog;gwe a 10 m level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially av.8, btuifo5 jnhf6.rnmsaue7y l /*6t rest) across a 10 m level surface. What is tu ,v*y6oh 5sle6./7nmjr. fif8t uanbhe 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 5.0 m/s. How much work is r3i kogstqtox46r6) t*jqay3 11c*q umequired to stop th 3 3y 6j*1iuqt)q*otmk6asxqr 41cto ge 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, what dq4 eogr53frz 6istance is required to stop a cgre3of4 qr56zar 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 du3rmq))i y zp1e*,b3e7h ehj53ghoph art. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave ih3zjbhg )*hy p37h)er om,35eqep 1u 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 vsecjf(qmjhe 5.55y+ rgdo; p 3ertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts(5cgjrqm+ phdoj3f 5.;eye 5s 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 j6 lky0pwq/ecet)k2.bxh / 6q /gxvi25e by*wg is shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Whatv5k6xqq wxce.b/ l *yw2/ek/ey6g2jtph i0)b 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 a floor to/ mk2p7vol p,k a height of 132,lk op7/vmp k.0 m above the 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)y 2/cy 1mxpmjunz kn.2hvw4) f:ur1x plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, hof)c/ j)k 4 up z:h.m 11nxyvwnxym2ur2w much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretl7-ps y 1u):f ya-wlevch 2.0 cm. What is the sprinv:- w )ylfpua1s-yl 7eg 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 spm( xw: jno++f neg6q*sring constant of 60 N/m. How much potential energy does it store, when strsfx6 ++w (q*on:emgnjetched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed spring with as-suo )k6-di;,fjes m6q/s kx spring const6s / ; f k6-uosm-)ksqs,jxediant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/m f8m8vqk :.c h 2r77kje3iqgxgkrom x = 0.20 m to 0.25 m? (3vr8x g ej.7kc:q72hg mki8kq 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/m is initially compressed by gse3m .if+-oqh 5--yq(7zn u2 7k6tuvy bwxtr3.0 cm. How much work is requ.f7kui - t(5 +og-ystbv-n y2q6zxm w7rue3 qhired 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 the t1ho hh+i -ng;y,sjy; zyss::o op of a 50-m high slope. What is the speed of the skier on reaching the ,+y yssoysio1;; gh jnh :hz-: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 inlhw9g8zu+yws :qx m72: xa k-zitial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevati+k87 wx-uslzq2a xwh: z:g9myon?

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 tond. a8qc4y.q/aut( the bottom, it has a speed of 9.88 qtqa ctnua4(y. .od/0 m/s. What is the vertical height of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. Whenli (odts s- ,:w6*dzfg it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast isog -l6d(,tf zswd:s* i it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground level with a kinetic*eh1z;;lpi te energy of 40 J. At the exact top of its traeh1t ;* e;izpljectory, 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 the ground with a kinetic energy of 220 Jl59xqjbmt 6(lw6s9k q . At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height,sx969lqm5q 6wbk jl t( 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 re 5jme7e n,do-est 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 senj57m,ed o-elope, 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 zq/+ p7z fs3z3a0kswowith a speed 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 zz+/sow3k3 0af spqz730 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 ad0bf*i1 m s/dmulg au; ,/ *v5h6biqyubove the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be thefla d5/u m*m/qhsg,ubdv0ybu 6;i1i* speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed offj6 fq6t q3kc8 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 2-kg pendulum of length 50 cm is pulled 0.26 ,fa fx0xi. u6em away from the vertical axis and released from rest. What will be its speed at the bottof6.aixex f ,0um 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 initiallyssw tu ew j.y1*ffdho38w24uqo4svx.q 0vv:; uncompressed horizontal spring with spriohvjdwov0s :uf4 wy8wu 1s e;xt.. 34sq*2vf qng 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 20 up4-*tlvd9 gt00 kg car to stop for a red light. What work is done by the friction force agp 4 *ttud-gv9lainst 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 betfrx4 76 xx2zxtween a 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 4zxf7tr6xx x2 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 surface. It has 24 J of kinetgrxgc,q9s f62ic energy. The friction force on it is a constant 0.50 N. How farcs9 g62,fg xqr will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on l1 z ofao*8d8ta level surface. The coefficient of kinetic *o8 1oatfzld8 friction between the mass 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 high sl0 ;u:x j8lcxsfgmcun mb4;( 7a )/lxcgope. If the work done by friction:x (a mjc g/xsl x8g7)uc;u4cmfn0;lb 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. The5fp 5v*thshb9 plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What t5p9 *h5hfv sbwas 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 res8nveyf (12m oub eq-f+t at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mas b- f+mfqn(2uv8 ee1yos 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 frgi yshji4y)81w.upv 2 om a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts ong) yy pi84vui1wj2hs. 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 uhoy2g q5.yc:6 6glj.,gu lgp boy using energy when he runs up a flight of stairs 10.0-.g.,gpq o uc65 luh 6ygl2j:gym 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 f ::dqy08; hgoqheg; pan object with a constant velocity of 5.0 m/s. What power must be delivered to the object by thehegpyq:hq;d:8 ofg;0 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 fou 5akg(qf *uc8wnxn --r 1.0 hr? (1 hp = acx*w(5n -knufq-8gu746 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 whpkc7 n rdywqv(wnm:wy7a, 034ile riding. How much force does her foot push with why 3yn apwnww7(vc4mrqk:d 0 7,en she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 -c6h1r/g c 2 bijq(gks17 ucqu xz8n*kto 25 m/s in 7.0 s. What is the average power gsj - 7i(n/z*g1r6cbqkqc1k8 chu2xu delivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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