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

1#

What is the correct unit of work expressed in SI unitn;4eqn j p:0rlqr1h5ns?

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 th6z3n59tnqi58i l0qybqk:icb ere is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the te-w zo +psv0-10ddhkq. 7fwr amount of work you doeh+0drt0 vsdzwwo. kp-q-f71

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 bein 2d+3hoe-37g g/uyytmg(g b gvg held there. How much work is being done in holdingv3hyo (gdmyg-gb u/t 7+3 g2ge 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 velogegpz)z+b1cy )p)1 kzcity carrying a 10-N obye zpgzbk1cg1 ))z)p+ject, the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then r/iwwwt( -ph19v7u vdj j:ogm0 eturned to its original position. If the total weight is 30uv19(wjtvj7w0 pgi:/-ho d mw 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 work on the object?p; jgao,9 ckd1siz ),* me6bxp

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 work done by5bs2 dgxf (rjbm.1;0 ndu3weq gravity while the ball g3 dexg5;bqrm0wdfj ub .s2(n 1oes up with the sign of the work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Forcayj b)*i,pf8ay2f ug c;x6 1+gdoqx*fe versus position (F vs. x) graph, representsdpa abyf+qf2 ggx*8i)o6xjufy;* 1,c

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 th2(m4 j*gzm tmtw;b/ekg(o2 w ce work done by th;/o m(tj(ew4w22g gmmzkbt*ce force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is pl1 x zwhh7y0f8.u 9sbdositive, 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 object9,jq8d7 -3is3nlm-fdiqsmsw '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 onb2bmv m8m yb.+7pci1; mp aug( an object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, awg-d kh/3e. la kgojgcbw9(5; nd is moving at twice the speed of the car. Which statement is true about the truck's al ge.g/jo gk5w3h-dcb9w;(k 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 massqlybr:7: 5 j9(tozoki6hxi w+ of car K. The kinetic energy of car J, compared tox7 l r9it wk(bjoiq+6hy5 o:z: 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 boutqtn xbeg i8mq- k,45s*2 vri(nces back with half of its original speed. What is the ratio of the final kinetic energy*bi( 5tqie rx-kn428mgq, v ts to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at z-y5 mg ho2f jvu.r:y:a speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what ism g-h:f v2:y.zyru 5oj 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 moving wito/8u-+o 4 r1a q5l asipoi:fngkv;mdv9-8 yet h speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater disp45saeoq+ 8vi9 gmf/;dun8--:io 1 kolyart vtance 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 ibt1am eq: ut;i-uf+p.n a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance ;iqepu a.tbut1-+:f m would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in0oc85 r2:nvz/: cnnzazbx5wo an elliptical orbit. Neglecting any frictiobc5x 2/n0o8r wz 5 vcz:nz:oann 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 princip lz. fs69059kuhwa d*ryyjdq9le.

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 test6 me0 c+0u/syw s-yo have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from *:8s)tr c/ucuy1hoicrest a height h above the ground. A second object wi c u y8:/)rst*i1cuochth four times the mass of the first if released from 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 d8 2f2kvt tp-cend of a spring causes it to stretch 5.0 cm. If another 0.tpfc28-k 2tvd200-kg mass is added to 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 energy of a systbgn8y97 y z*lyem

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to i f:ev g,o3-pdsts potential energy Upg-:3eo ,fs vd.

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 r/c 82.p r/xhhrjmlp6car driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal speejiq8.7u akh e,ds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater heigqa.7,8 ukihje ht?

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 2zel gm97g4al$m_{1}$ 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 ene-ojbv*)xety 3rgy for conservative forces.3*x b-jy evto)

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 friction99zh+hky1 ooqa1c,.p r45sxtlrnv i hbs1 (2h is present), to the gqhrrvik4x y,o1 t299cb5h l +spoz.h hs1na1(round below. 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 and gains 30 J of kine0* +h)olez n 1pp;vm uregy3:)xnxu h.tic energy. Do not ignore air resistance. How much gravitational potential energy did the ba)v.n:eg yo;numhe 3+* 1)x0phuz pxrlll 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 o:q+b 3 :xjpyb-4su* od-ds)ivdawa4lf gravitational potential energy. Do not ignore air resistance. Hbdu -y 3 q-a:sw*)oavxd 4dp4 sbijl+:ow 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 conservathm:kvwzk(9 n*mvx )lzudfu 9/,lll30 ion of energy.

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 is3fz vpd73uf* :/jy mto

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 i)lla8(;7ruwhbs+zeclzdg ) o9 fm+6 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 n31f k; mod5hinq(6q apot 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 2uvasdhqfebtnrh*im(lj k81b 6;z /3af- g3 *one-third the time. To do so,3 n*bb 1m* f2fqsrkugjdt3ah;h/eiz8 lv6(-a 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 acceleration, the car's e wf.r t+sq)c2vngine 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 f/ s z2yw0i gedae 5zkdp9:83om and held there. If the object weighs 90 N, how much work was done in lip:a/ z0gf 59k2s3wz8dy oeeidfting 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 physii,kjawzlh,*q+*p+ mx 0zaz xm3jo27zcs book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. W 0 k3zmpw*xz ja+xz 2mqzlj+i a*o,7,hhat 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 ovz(m 4t(aaanv2dh .rox0;s8 upward with a constant force of 5500 N for a distance of 50v4v8ht ; 2zao(nodamx.0 a s(r.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 a distanvwhf. i pzby.7tz6zhb oj( -h xh,jznp+ v*5;0ce of 50.0 m. *(nh;v wzzhjj , 5bp ftyipv.b0hx+76-.zhzoWhat is the 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 upward with a constant force of 5500,qbqkd -e 4yu(uo/( lt N for a distance of 50.0 m. What is the net work done on the-(lqqey, u(4b t kudo/ 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 along4o *:b:m evb4uzqdfe tx5,jx6 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 8v23*c ed) uquk.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surf ep6j* 1 cxhyr4;r:ooiace (assume no friction), with a fiyoe o6 :rp*xcr14 ;hjorce 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 i g9b 4aqlq 9 1mdps3:gwo+je;un Fig. 6-1 shows tgs1dquw9pjgqb :o; 4l +3 9aemhe 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 direction of the force. Thepmf0hee ;cr)0 graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object e00e hf r;)cpmmoves 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 inlfw-q0tcd)2oq n1a op--3ciw7 sr6 yn the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done whan031 wqrctoln cpsq -76 -2-ywd)ifoen the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. absy(v 1,9jvw The graph in Fig. 6-1 shows the force versus the object's position. Find the work db,1s ajyv v9w(one 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 (initially at restr gp;ed./* nla) across a 10 m level n. *ga;de /lprsurface. 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 sd7z /2 pxtla04ns2ywd n 7-iemove a 55-kg cart (initially at rest) across a 10 m level surface. What is the final spe7/ t40nl da7nsewdi x2-z2ps yed 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 speedq6q67bg5w pz n of 5.0 m/s. How much work is required to stop thz5bnw6g 7p6 qqe 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 fxw* n dq0xaz; 9:,5 vvjp4qkkinitially moving at 25 m/s, what distance is required to stop a cw pkq *nv;,:4vx dx9afz jqk05ar 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 dart. It is cc 0sqg4e+6viec5*p ;1bozuu (or lc.zocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the da 1zu4* cb op c. esloizcg0que;6r(+5vrt 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 horizontazbi+,+b2(x fj1c w ynyecbxn 9vx56-f l component of 80 N and a vertical component of 60 N. The force is yfv 5xwe9(ibx1bcybj+,6 n -+n2cz xfapplied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, striking 5ipk9y*p.zt gkuifm6 j r )y) 41zss0ethe hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on uyi gr0 j9zk5fistm* .skp)e )y416p zthe 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 a height ofo2 tplk,+f z3u x(/ojo 13.0 m aboouxpo zk3/o2 lj,(f+tve 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 plane. The pl 3k hdcrc6o-p2ane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how muc-ocdp6 2 rkc3hh 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, o 650cp,ppg-bc vp-+n ied+zccauses the spring to stretch 2.0 cm. What is the spring cons z,pdv-ipbo6-gep0+c5 ncpc +tant?

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.z9 b.+1: wnzejpi3b )kh4k tzb oux+(b How much potential energy does it store, when:nbxbw(1 +p4jzhu zbkoi3+b9zk e t). 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 ig vzp5kq*p8k 7nitially uncompressed spring with a spring constant of 25 N/m by 10 cm.8k57 pkv qpz*g

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 u1xbd0p 5(bi;v98swkj yi1 bxz )q,gyconstant 40 N/m from x = 0.20 m to 0.25 m?(,k8zx )0u1pyybv1iw5xs9q b d bj ig; (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 j8+ n1tywhm,mof 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0mmj1wh+8nt,y 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 isx s;j)zn+pvgtx 6s b(,4rsj f5 the speed of the slier on reaching the bottom of the slope? (Neglect fric( g+sjbx65n4, px;zvrsf)s tj tion.)

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 offt i jg9952weevo ia.- p:u/bdjam5t-, kcula9 the top of a hill with an initial speed of 4.0 a: -5dpki9tj-cieow gvb/a 959 lm.atu,j eu2 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 bottom, it has a sedmerh-e.,px) dv;i 0 peed of 9.80 m/s. What is the vertical height of the p)ddh;mi .,-ever0 p xelane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is. 8xxv8af(8 -cm )zppcc+qilv 0.70 m above the floor, its potential energy exactlyx8mcvcz. p(x8pc) lq v8a f-+i equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straight up from ground ij.pxt-l2/ddm ,e5y b8*f tlplevel with a kinetic energy of 40 J 82le/5dtjlbdxyfp,-m .*itp . 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 the ground with a kinetic gk 7*npeu v /8 365ijhg1ugcpw*bx3qj energy of 220 J. At the highest point in its trajectory, its kinetic energy is qp*nb8cgu 3 u517ewgv gxp3ik6j h *j/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 rvz z a8-hq+ v8 . bnbr6eut7i,:pgs n+6ccz5jnest 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 tora7.h,+u6n bz6qzvg8tj8-+v:zcni bnscp5 e p 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 x6iyf u6dr5i r97g0hi m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect frictionxiyfiu hdrrig 709566, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point k.6 mrzlb(xsiaqud5k;i :dp2ibk 683 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the db l6ax:;p6mbq(8kskid k35 z ii.2runext slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of th9i htb s 0p:t8 8lpq2n4kpjxf:e ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm aw-/a7efv j ubcdu (01paay from the vertical axis and released from rest. What wil0 ufc7vj ab pa1(/d-eul be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving afyhekg 6,;0 s5ygb,sut 25 m/s hits an initially uncompressed horizontal spring with spring consta ehgu0;y5k6sfys,bg ,nt 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 foa*p-;n5,dr-utlh pwi9e x3ucr a red light. What work l5uidwx9 th-a3up- *rp nc ,;eis done by the friction force against the wheels?

A. $-2.2 \times 10^{4} \; J$

B. $-4.4 \times 10^{4} \; J$

C. $-4.84 \times 10^{5} \; J$

D. $-9.68 \times 10^{5} \; J$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and ie4aukz ug.) 8a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before comze 8iu u4a)kg.ing 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 kinetn7o0c ludgm.v74v0ng fmj h87ic energy. The friction force on it is a constant 0.50o07l8nh gg. dj77u4cfnvm0mv N. How far will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a level surface. v1g3lqv mkq) 5 f4j8jtz) -u-t4wan jh 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 its kinetictqml5 j nj)zu)vkw4a tvqf 3-18g4h-j 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 po)k x,qm)kv4ln 0 b/krest from the top of a 50-m high slope. If the work done by frictqv0k kx),)k 4 /lmbnpoion 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 j8:b*lyx e ay0plane is 4.0 m long and rises 2.0 m.* a80 b:eyyxlj It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from8/xutzw -fz 9x rest at the top of a plane inclined at 20e above horizontal. The coefficient fzuz/w 9txx-8of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, xqsm svwwo3j ss 4 4;749jezo*and strikes the ground with a velocity of 7.00 m/s. What avera 4; sssqx3*v7jow9wjem s4oz4ge force of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flightqjy5 tl*,tjc;x n9toi 2(2blk of stairs 10.0-m hit j2it bqokc5 j9 l2t*(x;,ynlgh, 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 needeu m.5ddk in.mrc 5k1n8d to move an object with a constant velocity of 5.0 m/s. What power must beur 8ni.1 5m.dcdmkn5 k 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 u( n1ho*odw c0hsed by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 whod( ho1cn0 *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 ra6gcrd-ixyy .hz(2f. y te of 500 W while riding. How much force does her yxg.ry2hd-fc( 6 yi.zfoot 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 0 to 25 m/s in 7.0 s. What id 3ops:+lijx5 i97zqxll2x r:s the average power delq3jo9+l::p zsxlixrl57 xi 2divered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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