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

1#

What is the correct unit of work expressids b5 l:jcy:5lk6f7 oed 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 if there is no mook2 ji; r-et:jtion?

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 amo qq;mf/rylp*1unt of work you d;q*pym/r q fl1o

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 ther b sbxp/bsn)wug;9 :*be. How much wor/s9bxb*wp subg ;n :b)k is being 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 al o ixnt39pf2wkp.8 s0 constant velocity carrying a 10-N object, the amount of work you do isn9wf8kl.t siop x3 02p

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 eiql;o( 7xts6+l4t s:c t.vou :ime4 gto its original position. If the tosele6s7ltiu vocg;4qm:t t 4. x(+oi:tal weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do wor9c,i ioowv4kin3 z.-ek 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 signt0hpi, y izbdn* 2d58s of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down2ys hzp0ti,5n d8db *i.

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;lpk5ajr c7(2 +potc l versus position (F vs. x) graph, representsl+k rtaj( 7c5pc ;p2lo

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 doneb k+k*zvo +x ;-e4ufod by the fofo+o -bzu+*k v4k ;edxrce 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 onxx*, y*5 suq oz4im)mj 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 objec,0w,c *szu updt is negative, then 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 o fm oyr,n )/n+q eq,1lof:ini-e:/ xvhn 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 cae: u8ecenff pm yr:d 4:rfm013r, and is moving at twice the speed of the car. Which statement is true ab ud34ece:mr 8p m r0:y:fenf1fout 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, qjh db:.5qpe)6hfg8 mand car J has half the mass of car K. The kinetic enfjq8 hd qgbm) :e6h.5pergy 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 :sny3;p 0 c6f1jljjzoback with half of its original speed. What is the ratio of the final kinetic energy to the ilj 6; ysnjjoc0:p1 3fznitial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5b**jfeaxfl+tg m3f 3ds:d6 0v m/s. If both objects haves fmfx+e3*b*t0:l6g f 3avdjd the same kinetic 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 1.0r;scj:ff. sjdvb- y9*-;gdqk-kg mass is moving with speed 4.0 m/s. Both objects encoun.9ksfsc-b gjj ;:*-fdrydv ;q ter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain distanceb.z.n:+xb+h.xhnd6fz w7 v/ qwqxzk 6 on a straight, level road. If you had been tqnv .z +w7f6 +h .bxk6xhxz.dbnzq /w:raveling 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 orbix3y,/el )+24ivoq opei us hq*ts the Sun in an elliptical orbit. Neglecting any )/y2,eeqioxu vl s oqi*hp3+4friction effects, 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 lf,(uz5 movf-fe(f (4ig i *cpprinciple.

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 51 2yyne2s) i5oh ; n5sfdpkxa9.asxchave 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 height h above th)yox1isr:64qhqa(z yy h0j .kyll;u+e ground. A second object with four times the mass of the first if released fromj:h+z1;ol4)xh 6 y li.a(ykyyqs0 qru the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a springf,;kho hv 2+b e5plc1ah* 8osa causes it to stretch 5.0 cm. If another 0.200-kg mass is added hcabsh* 5p,2loea +h;8kof 1vto the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical ene,z h o4y vs-/hgohsi;/rgy 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. Compafa2c(ky( k0a)au nlmh 7-,ms sre its kinetic energy K, to its potential energy mual-7hn0(fks , m sa (cka2y)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 dwm t3gc5c)2v kriving 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 sliding with equal speeds ad-kp 7l d5kuo9-jc 3qwlong a level frictionless surface. They both slide up the same frictionles37dk-woqu9j c5ld p k-s 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 lx ynh+; .h3ad$m_{1}$ 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 mec3.b 7ef gy t79t mll7fikn*5xsz/ esf9hanical energy for conservative forcesltf9 /i7.s fnt g7xl 53ysbe *m7k9fez.

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 friction is 09tdf+):wmg0 wt l +*9r/cb pdf+ pu:jfcfrznpresent), to the ground below. How does the kinetic energy (K) just before striking the ground comc9p fg f9fuwtjbn0t wlm/:d)r+ +cz r*0df+: ppare 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 kineti4ukdzk py./k6c energy. Do not ignore air resista py. k/64zukkdnce. How much gravitational 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 ;3uqre .o4atk of gravitational potential energy. Do not ignor4teu 3;.krqoae air resistance. How 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 enere,ymv8x2)y1 lz tur n(gy.

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 is0 y-x9,. e.af(opy6ej lkrp njtk0lv*

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 SIk-v 3smivi 8ffv:u18c x;cen- 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 nozu3e1sfy7 m; st a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third.yhpny(es9 + z3n(cyx the time. To do so,3yxyn.hz 9+n (y(cp es your 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 at a constant accelersr/i3rp 6y g2drqrg08 ation, 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 ve+ne*m b) nf.che wyk. *y:zg5hrtically 2.0 m and held there. If the object weighs 90 N, how much work was done inz).chb:gk +*ywm y h5.efenn* 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 wybflzp,w7tm- i6z (8nt velocity of 0.50 m/s. What is the work done by the wei7,p w(l-bwiz6z mtfy8ght 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 pulledi0 ijs; / w (dhl ka5j0vapo3s++pn5fq upward with a constant force of 5500 N for a distance of 50.0 m. What is the work dl(5p q+jiso nshvfaj iadpkw0; 0/ 35+one 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 s3wl ut ;.v6lc t;70mboikl3u for a distance of 50.0 m. What is the work dtsw . mk0lot33v;ilu76u ;bclone 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 pulleq.:v5q jxb 5ciu/x n.sd upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done onb qx/..ux:5s5nvqi j c 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/;tt*k/m lsf- rnew 7w.0 m 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, inclin2x77vgg /4vrwgntyd1ed 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 S uezckax, +9y7arah in a sled on an icy surface (assume no friction), with a forck,x yc7e9azu +e 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 direction of the force. The graph in Fig. 6-1- /,i09,cjgenrer pvh shows the force versus the object's position. Find the work done when the objecn9 /p-ihje v0rre, ,gct 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 6 ajdr4no/ui 4the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when nrd6jou4a /4 ithe object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force.42audjkk)b oxhv . ,j6 The graph in Fig. 6-1 shows the force versus the object's position. Find the work done whejb ) x j4vokdah6,.2kun 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 objeclr0tuigfutgo.no(5 ei v;50 ,t in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movesuir(fg.euitov o05t;lng5 ,0 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 app7h ym/t)7yn5:csv(g)b t m lgulied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the cart7 g/5n(tlygm )h m)tv bcs7yu:?

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 lrl c 0b5c(,qaxdy41,+e apphcart (initially at rest) across a 10 m level surface. What is the final sp a 0, 1alqhrbl,45ye pxdp(c+ceed 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 required toz a7u zhz, h49ytnq6c7(hqsh 5 stop t7h ysznq qu5,hth6 7 9(z4hzache 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 to0hy:n ) kenc; p4.mxs5 r3ypat 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condikcn3h o)04nysmprp . :x5y;e ttion?

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 gf9gd c8 scb8n.2ebx8n un propels a 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 8s8 d8g9.bncxcb e2nfcm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and aaagzj n8.9acbr/ f06i 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 floorri89 aga/anf0 .j z6bc. 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 ho m70)yw.e7oynb;rss g rizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is0ryss gobe. 7;y7w )nm 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 3- pn7c+;buq wg:b*d x+pt)sg/ ciqlya +1kqc 7.00 m above a floor to a height of 13.0 m above the floor. What is the change i)/cx+:q;ty 7l+cnid+ka pbbqc gus-1 3*wqgpn 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 lo9w+z z0y/e6su;m;g 6b wy yk, 6tweqwcng and rises 2.0 m. If the plane is fw/6wcyy ;w0qg 6,zwb;6 k+usmt9ye ezrictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, cause3 0 mqgz:nh1ses the spring to stretch 2.0 cm. What is the sp qz1e:mg3ns0 hring constant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. How mucx-s+r+w ;clgvh yrx8-h potential energy doeshycw lsrx; 8-+xgr+v- it store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an init)j; hcc8gf4nn ially uncompressed spring with a spring constant of 25ncj; hng 8c)4f 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(w7gdyg 4/u6o mzueghvxdd 8l 5+o.t8 spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched +g(umddu7e ozwh 84/5.t 8g6 x lyvgodposition 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;gx / qnvll;sk.n .x.q.0 cm. How much work is required to compress the spring an additionqng .nsl.;x/.l;x qk val 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 t*s3nacld 5s/7 pj/;oltao2snhe speed of the slier on reacdasj ;s 3p7*// nc5o2s otllnahing the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes of7j1vsesr6ic;8: ;r3 a zsw ybef the top of a hill with an initial speed of 4.0 r7a yc; bj3v e1z;si8ser s6w:m/s. Neglecting friction, how fast will she be moving after 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 frictionless inclined plane. At the boe -6t*smah yrx5ehc4u6j8bv 2 ttom, it has a speed of 9.80 m/s. What is the vertical sjhmyc8 eba-4 2etx6 h6r5v *uheight 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 7b(fge; w6fdrc/0 ajf it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it mjrdefg (b/06cf7 w;f aoving?

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 straigrt,qm)m9 e3( eg 3spiyht up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is)es ymgqt39em3 (,pir 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 +. 4uory sfkmzaixz-z h :u71c38/jaeground with a kinetic energy of 220 J. At the highest point in its trajectory7r-z 1z8z exh3o+akaimc4su:.fuyj/ , 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 mzhf1 7gut,69pt: +j j)jre wdx:w 1wsb above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at:z,7tp 1hrj+te w6d1 jj):wbug x ws9f 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 ,hhu6xsv3 .oar. m(qq 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, whic.qhs umaxq6.,vr(h3 oh is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dipk*g4u)b0fg2 4it aawa with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, whichg2iuawf a*44agb)t 0k is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at the bottom of its swing (poijjml,-i 1p**eoq2 paznt

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the very; 3hstia z4: 7n0i sqqvuu3c8tical axis and released from rest. What will be its speed at the bottom of its swic it;szs0 ai4nq 8y3:uuvq7h 3ng?

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 horizontalcp+ l:f*rc4kos(+ gw ) r7frvn (ds-ir spring with spring constansplig)wkfd++ - nr:ccrrs(o7 (r4*f vt 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 car to stop for a red t v 14yq*whbe1pag*e* light. What work is done by the friction force against the whegey aq*e4*p1 hb1v*wtels?

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 37,iuwg74e5ilsxwg e 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 distanceeu4x7iwgwi l 375e g,s 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, lezzv3r56n y6tdn r4cxlt lbm( 9zv6:b p3xk-4qvel surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. 6 nt6pzqz trl46zm x nr-bc:(3vbk45 yl9dv3x 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 horizonj w ztlemmpg 5ei5t3k;)9i+5d tally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in it jme95zm de)i i+3plkt5w ;tg5s 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 slopee )gbna; c.ue0hg kq1,(q uom1/-vk uh. If the work done bygg,euq;c 01mhek -uv )1nou/.h qk (ab friction 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 lw.inub5fw )c(aom, g; g)6jzm long and rises 2.0 m. It requires 3200 J of work to get the box to the top oi guwzco)n,ml)wf;6 aj(5bg.f 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 y dey7kq5 -zzeg(7zyfh2p:3i above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of thzpe z72fziykq5ey :y7 (d3- ghe 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 strikes the ground fgx6+a g-*z f6y 0hw-abyj./(iwr s vwwith a velocity of 7.00 m/s. What average force of air frich f(6j0.-f*ywir a +bzwvgyw a6/-sxgtion 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 fli e9,ohy7gbd2 ught of stairs 10.0-m high,,79guheoy b2 d in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object withx3s0z;/-k q)jbpbzx a a constant velocity of 5.0 m/s. What power must be delivered to the object by the forcsaj0b xb kz3-/) p;xqze?

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 run+gl4 ,zrnli/ws for 1.0 hr? (1 hp = 746 W)glwr/ n ,4l+iz

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 l)c-6)n,uuub blrzh8of 500 W while riding. How much force does her foot push with when s luc)uublh- r)b 8,z6nhe 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 accelerat 2j;kmizr(hahy3,tli2n w9z:es from 0 to 25 m/s in 7.0 s. What is the average power delivered byzi9hja 23 ,ir;z:k l2wt(nhmy the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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