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

1#

What is the correct unit of work expressed in SI units?d5vhiry-/ ,wtfvi 7)m

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 ifdf. 0ws( gsgk854rc-pitu,ln 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 againfd o 2n9tb(/.i7t yb: chbrwf-st a stationary brick wall, the amount of work you dobbric.7 d(yt2tnh bf- /wf :9o

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. r7 (az dc2v7jy: 0qzpq7kh,p1mgf mr4How much work is being done in7f4m: zkc2 71r0p rz7jd(mg,v ahqpqy 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 carryink/gm r)hj;m hb 8g/bh8g a 10-N object, the amo)rbmb g hk8jh8/g /m;hunt 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 re cb3: ( 1igys76uxpqiqturned to its original position. If ts :13iguyxqq(7b icp6he total weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acc9yk8;0 dlubh-wkz9sd ( pma 4ting 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. Compare w .3cc-2t : 9/sbedcgdi k+fs0a g+l ttu91zlpthe sign of the work done by gravity while the ball goes up with the sign of the wor0wi- /au3 9zg+ csbpfld l:tg9.d etc2st1kc+ k 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 kp +1kam;o)jx( ewl/c, on a Force versus position (F vs. x) graph, representswex;a1pl(/c kmk j+o)

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 gu 9*nsxqorg *;/ )dlrvs. x), what represents the work done by the ford ;ul)r gg/r9 xosnq**ce 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 kinetic enx- b7da1gyh9 7pfdl3 yergy

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 e93:kw krq8iyohk, px: nergy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then tx ng+ f;b;ia/le: zdv;.nu)juhe 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 anz 2xv+yq8sca0u7c q:yk n 4t( car, and is moving at twice the speed of the car. Whicnznya7kcq 0 (4vcxs ut+8:2qy h statement is 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 car K. Th /ndf exdb1e *rbx9g20e kinetic energy of car J, compared to car K i bdnde re9*x210 b/fxgs

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 baxvz 0 i.n1lw/yck with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetxv.y nl1 wi/0zic 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 br.*cgdjny5skcc8 1)moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rob g85dk ry.j*sc1) nccck'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 moving with speed :vij-t+j;cwvyff q:9d:x7 ds4.0 m/s. Both objects encounter the same constant br: vdid+t:sfcj:7 f-wy;9qx j vaking 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 skryg(k hg:k4-aid a certain distance on a straight, level road. If you had beekk:-yr ga( gh4n traveling twice as fast, what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant maso )3+zz awm (/eegrf1ms orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kineti(famr/gz1 ow mz)e3+ ec 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 principm gxm0-vc gk15le.

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 negative po2l:*k hnilv-0)h xg.kpaz5b82 wibdk tential 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 .h+4+go fj n h35wvirlk;g0zv the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared tor ;wnfg50k+ovv +j43h ig.lh z 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 stretch 5.0:zryzh *7j vb;izu6b.cxx ;(f cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring w.hu(zzcb:7;x 6bzf;i y*rxjv ill 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 ol (gid2u3gj7;v(eo q energy of a system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Cmi)w,- t ;t8lgasom 4kompare its kinetic energy K, to its potential energy U. ,)-tl4tmokgm; swai8

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 ocqzwoa6)m.q2d4 k6,w2n9m(v tak/m tbw 7zzsf 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.h xgou l)l oicw ()5 dex9u9(4xsrr 14e2mvkp are sliding with equal speeds along a level frictionlessl2ude4xmio4hs lgx5(x o(k w1)crrv9u9ep.) surface. They 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 x6onqs fz)j9 a8p 4kp.$m_{1}$ 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 conse2zth y.q3t*s2(g ,jw hjxe6ag rvation of mechanical energy for conservative forces.wj* 2 gtxqts(.hzg y eja62,3h

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 the6-olqp;pxrnh g: k)rp+ i /,ak air (air friction is present), to the ground below. g/k+hrprxk ,; qnl:6p -iopa) How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance e ydq72rxxfl5za* (odyv8+s8and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational poten ay xvsle58zoq2 8dfy(d 7xr*+tial 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 en3; 7s5bt xhytvlrt*wj (oo6 r-ergy. Do not ignore air resistance. How much kinetic energy did the ball ga-3xo6r7* tytvlo;j5t (b hsrwin?

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 energ, q;e.xaf,u hgy.

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 is9k za 15chd :i0d vml)akoti06

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 d+ + v+n1ppis2ea1ynz unit of 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 o nlwcokonjpv(h7ut--0c 6s -2 f 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 timesuh k3k. p0yliec7*s- y the work in one-third the time. To do so, your power outpy- huey*pci 7.k s30lkut 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 caskk tt,6y-+ m1lrrx i;j g:h,mr at 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 2.0 m and held there. If the object weighs 90 N,s6p+3ic/b v, by vb3fa o(xh9q how much work was done in lifti bsp/+9,bi aovf3vx3ycb (q6hng 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 ai( )i2 qh8w.-ftco sbh+ktxoaikx+8 f/r a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weighxc2 +ox8+ots-)ih/afibkfk (t hqw8. t 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 distann s ;a5 +mceb7ae yrgz-h5(c/pc5cp- /e7sze;c(ha5g bar+yn me of 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 upw b-ameg 0bdcq32d4r)hard with a constant force of 5500 N for a distance of 50.0 m. What is th2h4c) d0e3mbqd -b rage work 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 pulled upward01wzocwxzf 7r6muj5- lv;e3u with a constant force of 5500 N for a distance of 50.0 m. Wh7 luz wjvx uc-305zf6eo1 mw;rat 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 up ay ;ud(jzvud2tey (1 l1 +ak/yllong 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, -sqpv-ghh 5/vz s p.-c 1*m1kuc:fjif 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 oltl1bnv .4yml0 gns5) n an icy surface (assume no friction), with a force of 60.0 N at an n 5lbvlsgm y01lt 4n).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 o)5 ) ( yc1dyu1colmg6ogjbuwb)5cd* nf the force. The graph in Fig. 6-1 shows the force1cbycd6)b nw uj)*o5(gdg oyu15 m)lc 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 ingi6sx/ 1jc d z*3kb4mqyh -y iyv,kq*. 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 moves from 2.0 toi3i. 6-q1 h,kdgsvqb xzc*yk jm*y y/4 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. 4,kobum 9llg ue:pf+9c m*s8yThe graph in Fig. 6-1 shows the forcemleu *9f,osmgcp ylbu 8:4 9+k versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of em( ww:1i h*0ojttrp7b;9fof the force. The graph in Fig. 6-1 shows the force versus the:hf0t( jrfpb;i*wm o1weo9t7 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 is applied to move a 55-kg cart (initiaifz+r551h psw-kt(oa*uno n0 lly at rest) across a 10 m level surface. What is the final kinetic eni5+a -z5won 01frot np*khs(uergy 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 g;a 2s6s rpz4fto move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the car;4rz6gs2ap sft?

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 w0lp :0 1onkkkcork is required to stop01ln kkc:op k0 the mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially a fg 8f)naue5pv cqu5..2g +cimoving at 25 m/s, what distance is required to stop a car 5qv gf2)pc5. ugnec+a8.afui 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 a7 5j/* vszfop7 wzi.ndart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the da 7 vnij5s7.w/z*zapfort 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 5 bt; ,adt7ukrN and a vertical component of 60 N. The force is applied to a box which rests on a 7 5t kdb;,aturlevel frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of ha,(cw-+y+ etkhcy f c0yy, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopt,yh-f kyyw c+c(c0e +ping 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 g .zse yy8+5pdm above a floor to a height of 13.0 m above they.+ey5gpsz 8d floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long2/tebix gry 3;4ped: :hoxe.m and rises 2.0 m. If temed3 :.x bgeoxht 2/yrp 4i;:he plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to strepcf lm+ (by 2re eg*97mcict*.tch 2.0 cm. What is t92 (7b*ge*c+ lctm ciyrf m.ephe spring 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 by5eb0isw8upekn+a8 , v a spring constant of 60 N/m. How much potential energy does it store, 8 n8awe5b eip0uks v,+when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressef/ ok, 2umw2rmd spring with a spring constant of 25 N/m by 1fo/ 22wum, rmk0 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 strf j 6zkjys4.h3etch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (As.kfjj 6hz4sy3 sume 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 sprinxp (c (hu- f7n7gdjuy4g constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0u(-7xp unyj cfd(4 g7h 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 rvvc*- 6lniv d09epz s9c1vw j3.pz3 mdest from the top of a 50-m high slope. What is the speed of the slier on reac*-jddvpczl nv1ezsc 69 vw. 0v3pi39mhing 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 off the top of a hill with0ceh8 sn ) 2nqq(3qvtu an initial speed of 4.0 m/s. Neglecting friction, hon30u28c nqth)vq ( sqew 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 downs c v-q sh:e80xlo12c-yk z8 pnah7:bw a frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of syq anev2 sp:hokl8-w1:ch7bzc- x80the 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. Whenj5ykmcatp g6z*c.3c( p.pu4p it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast ipk p..t5p cga (py4*m6j3zcu cs 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 kinetid6 ul+tb:rkc:iw*n /rq75no bc energy of 4 /o*uq+ c76:kdrnrw:bit b 5nl0 J. At the exact top of its trajectory, 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(d i,maoi81ayz d3iv2 the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To whzy2od1di38aai,i ( v mat 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 a0vs.g5(+ hlqvmzx :a bottom of a dip (See Fig.vma+ah( gsv:5lz xq 0. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the bofz917 1hzuquoa1 lq/o tnc.a6 ej 06hcttom 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/0te z1halha 6 c9 oujfo6qzqn.c 17u1, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip /ik1p3;3 de+:wkwg iz ygm lf;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, which is 45 m above theik+e;:wyig3z1m/3gpkd ;f l w 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 ssl(il.. s+l2t* t 4vsjo4*azv oayhj.+:l ootwing (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 cm is pulled 30 cm awayjz 4hn8t4*pot1 xz o1b from the vertical axis and released from rest. What will be its speed at th jx 8o144btz*1ntopz he 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 ini+4ik,uv*v bkgtially uncompressed horizontal spring with spring co b+v,i4 kuvkg*nstant 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 nn;2skrn l17qv03sjq um,/v3p kf(zqdown her 2000 kg car to stop for a red light. What work is done by the friction force against the whe qk 72uv,srq s0lpf3 3nnkj/n zm(;1vqels?

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 3* g7lmsg6gley +e w.qobject and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to s7+ me6gl.y egl*3wgqa 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 rouyp7lc vdyaxg1y+6- , 8zx 5qpioyg:wt; 4mqy2gh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.5ty+,ygy 4o85x6:yx 1y27 c qlwm;pip-qv agzd0 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 horizontall(t, tx (j vi6jw8/19kt dgvujf4jvg1ny 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(g 1tt1j ui,v 9fwvdg8 jkt4xnv(j6 j/ 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-mt4 blfq2l9vnv*(x92 r1vmb(b jwwu1s high slope. If the work done b2j 49slxbwtu bvv*m11lbv92 ( fqr(nw y 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 inclinedd* 8f z4 9zvxkf.ne n/fj,bo4v plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to o .fj/4vzvxzd bn*49 8nef,fk 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 res - qtafegbhli2q v,,8qnph +(c-v 8l9qt at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after slidinqitv8bq qa(q-f+ hhe8lv9lp-,,c 2 ngg 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 :d kpakiohnv z2 (:o4(m, and strikes the ground with a velocity of 7.00 m/s. What averagokvid po2h :4k(na:z( e 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 boysamy g.9u:8vr using energy when he runs up a flight of stairs 10.0-m high,g: as mvu9r.8y 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 with a constant vel0nmaw5 q(wz/8z1pnqaq(6v e d ocity of 5.0 m/s. Wn6z( 51n0mdwe a/qw8qpavz(q hat power must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are kbmey:9, gq;iw0l;g s used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 kyel, qmgs:b;i9w 0;gW)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How much force doe 11djyn-kt 0hds her fh -tdjkd0ny11oot push with when 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 k+ 9kh 32jtpktb1x-;u dtn3fc0 to 25 m/s in 7.0 s. What is the average power delivered by theuktc ;1n dp3-fkk+9jt23x thb engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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