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

1#

What is the correct m29*xo- *q-irtvmuk cunit of work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there lazduvo;i7hhf7 f5zp5 3s (z7is 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 aiu. u/z v1ducpe;y9axujl 26-ny*uq;mount of work you luqa -;j1 uu6z . dx;c9unyuvi2*ep/y do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is be;rqney*yw bu (ek/ j20ing held there. How much work is;ye e2y k*0r/(jubwqn 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 a constant 6slv*5qyd z.p 18n eojvelocity carrying a 10-N object, the 6sq enpz8jov* 1yd.5lamount 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 thenocp 7 94/z7.edanb6wennz z,x returned to its original position. If the total weight is 30 N, how mucbe/zzan6x,dnc7 nw4.e7 p 9z oh 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 lmbfx* :z u4zvt j3 psl+1w+qh34iw9bforce acting 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 the sign ofp l t(sewvlzeg0t.4a01e1 oj9 the work done by gravity while the ball goes up with the sign of the 1je0z. wlg9l t0(tvo eape s41work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (akyn2 se/gv--aqt /d4ai(+ )zytkgd * F vs. x) graph, representsn*is/ddyty-a+v a/) 4k-k(2zeqga g t

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the work done by t wkc 68e.8/bai88 yxvu. + muepwaxkj,heu6 +y eimka , kv8 .8c/8xpj.wbea8uxw 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 positive, then the oh3hq5k2q- iaobject'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 t .;gemv)e3hoe cu q0bi,p* *wthe 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 dw x4-1hewln- *a.ewk d, wc+yon an object is zero, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is moving at twice the speed o b/-t ,wi v8-pbn:abz1vo s6mof the car. Which statement is true about the truck's kineticw-nm p bvbo1o 8tba/6 ,z:s-iv 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 b47;ubbl wy,, jyq/ b+m-vdxd car K. The ky 4 l/+uby,7d-mb jb;vbd,qxwinetic energy of car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back with half of0lk,g t7i/1k c u-mlcd its original speed. What is the ratio of the f7/dml ukc, l1g0ctik-inal kinetic energy 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 a speed of 3 m/s and a pebble is mo/-) mcpq;b cr,y+ag oxving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ro+ y/qaxbcp)-c;m r, gatio 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 00m qf v2-yocjx2ihe*mass is moving with speed 4.0 m/s. Both objeo2vfm0i-yeqc h jx0*2cts encounter 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 b)32va,h uruh1l nf2ucar in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, whl,2 nuuu hb3v)fahr21at 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 orbits the Sun in an el4/+p0iowd (g,xj /6g5gtjp dqnnsh/r liptical orbit. Neglecting any friwqn(/n ot ,/xdgg/+46p5gs0jdpr h j iction 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 pr8lh9)5nso i*mcb odtur3d/)pinciple.

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 fx*q19arkh0bqis m :f g.4j9d*od-vt 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 frofwi9.m0bw 8qim rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the s 8.90imfbwiqwecond object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm. Ifsq) :z;czi(gv another 0.200-kg mass is added to the spring, the potential en (gs);: zqzvciergy 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 syi6gm(fdk06x ,-ieq rystem

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 ;joew : 6fs0;f5odwdhts potential energy Uows;fe 05: ; hdwodjf6.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a hil(y2 pzg8(bk z7msr 4 *qhjmoi,l.

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 ee0tyo7vs.3c8vl8 -hzvk w4h very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same fr s8vc-vtoew h0h 74z.y3kvel 8ictionless 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 7e9zd;8 qhe jjtjb:qf p: 75ab$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservative forc u7r04 jn+d 3y) vux 19lncuai.wfxt6oes4+n9yr1luujv7 fx3twn .x)duoa6 ci0 .

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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 frictio,hd4f 1xc;qhvgp5 e1ue3n vt)n is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the 1;en cvdxp hq3f1te,5 u hv4)gtop 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 disttzzd7a;9 xdq1q 6oz 6x-hlph 3ance and gains 30 J of kinetic energy. Do not ignore air resistance. How h9; -1qp3z xdt6zzq7xd6l aho 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 of gravitational potential energy. (i/ axhr .eweo+4(tdhDo not ignore air resistance. How much kinetic energy did the ball ho dieh4.(xte/wr+(a 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 o+ (yc:opl d6 .djqk2sof 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 is6yf-o g(-a s6k(yi xmx

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in SI unitr8/lxcr6c*l js?

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 unirpqq-sq yo6nq*8jt bn. 0bw2 *t 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 the tim:eu 1nkfqk )nzs30, qse. To do so, your po,u q1s zenn3s 0k):kqfwer 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 accele666xonb4zmqfb -bzyem 9 j9u -ration, 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 vert cbxfm 22;z8gc 7j+wtcically 2.0 m and held there. If the object weighs 90 N, ho7;8 2gc+ b2zwcctfjxmw much work was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distancevyso5+rzc x )nyun00 ( of 1.0 m, at a constant velocity of 0.50 m/s. What is t)y5ovux0( nzcy0sn+r he work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a consta0 fsbxjsp /e,*nt force of 5500 N for a distance of 50.x0 / sjep*s,bf0 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 is3)tsmajzlmhz+bu( bg 1-uj9 / 4swq ,t pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is th b3 z/tzt+j9lg u ass,1j)(m-whmqu4be 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 for,g l-tv(v *pn*9mze utce of 5500 N for a distance of 50.0 m. What is the net work dmtevvp( znt9*u-g l* ,one 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 along fiipr*h--6i ka $37^{\circ}$ 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, incldvx(v ucuj;2:ined 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 Sarahgmk: ohtfwvj i. ;r4-p1+: yjr in a sled on an icy surface (assume no frictiom1yf4w +vt.jk: :pr hij;-r gon), with a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of theh *wy,o b)1e+,iqxx tw force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the * xbhx)+qw 1oywit ,e,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 i;l6e j(tti5 uhvlj3m 3n the direction of the force. The graph in Fig. 6-1 shows the force versus the objelh35t;j(3melv uj it6ct's position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an objy.,n9zp k5fxtfg*u v:9 w9bzs( (mlps ect in the direction of the force. The graph in Fig. 6-1 shows the force sw9*zp5b.m xtv((f:nu9 p zgfk, lys9versus 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 the force. 3, rzqm qpgcu91t l1d jc*b/ 2)ssjh5xThe graph in Fig. 6-1 sho h/rs13tbsx j215dj*),lm qzcpugc9qws the force versus the 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-kgruzm) ;i ).qi/w7pcci cart (initially at rest) /u);.zpi irmcqw7ic )across a 10 m level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (init4dj0- uxb7czfially at rest) acro 4xj-7 d0uzcbfss a 10 m level surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How much work is required to stsamf:e, o/hf ptx009l(8 spxvopxs8 p (e/mv,0s fa9fhl0otx :p 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 m8 mnrm u+ rcl xdqeai.(i4:-n6oving at 25 m/s, what distance is required to stop a car moving -:l+ca864emmdi . n ruxqn (irat 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 cocked by exerting a forc*lilm v1 xfqr-p9 gg)*e of 20 p gl*)* r1gv qif9xml-N over a distance of 5.0 cm. 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 dx-/)itbr8 jon*f/w fhorizontal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, - tfbnxri*jf od/ /w8)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, strikin 1l/s9e;m usl tk2zp-gg the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping fo2s zu1-mt9 sk/leg;lprce 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 .tjr zttrbk /v*o2l .3from a height of 7.00 m above a floor to a height of 13.0 m above the floor. Wv t.t.*3/z jtr k2bolrhat 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 long and rises u9w*9r(k jnqs.egtk/ e d7zo -2.0 m. If the -.9or7/jksg9e e(d*tqukznw 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 spjna8;x t n iw9mm uy;*bi90;azring to stretch 2.0 cm. What is the ;0 uxtam; anz w;yi8nb9mij9*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 by a spring constant of 60 N/m. How much pouq- yb)0t c)dw-: vi 7splbgh1tential energy does it store, when stretched by 1.0yisqbdlg1) uwb 7-:phc) v-t0 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-i)w8--zan 9jhp2dc a 2v) nyt ztn 78vdqyte7 an initially uncompressed spring with a spring coeqa -tvtpndiw- j- vy t8n8a c)2zyzd29n77h)nstant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/m g6zhi7e/) qqnfrom x = 0.20 m to 0.25 m? (Assume the un qg6in)zh/qe7stretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially co, g/2ycz, rqo.of2.av.1 alpvbw5ifpmpressed by 3.0 cm. How much work is requirelrz/paoq2v.b2 i ., 1a,gof py.vw5 cfd to compress the spring an additional 4.0 cm?

A. $0.0068 \; J$

B. $0.012 \; J$

C. $0.024 \; J$

D. $0.030 \; J$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts froezj00 68hfyp9 ry4f:l-r6 *hepoqb jom rest from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom ofyrjeqflh4p0 rh0 6 oe6f ypz*- 9obj:8 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 thzzpi(2zl2 2ai6x0hbt e top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will shblpt2zi6azx( 0h iz2 2e 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 sprhf ht0 4ls4k17;vlhheed of 9.80 m/s. What is the vertical heighkh l t1l;fhv s4r04h7ht 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 floo.td;zb3b th i3*.ha jdr. When it is 0.70 m above the floor, its potential energy exactly djh3b z3b.h;ti dt.*aequals 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 level witji2lj 7;r90,ncxltmq 4 oraz/h a kinetic energy of 40 J. At the exanc0/ 4l 9lm q,ti2xj;rz7 oarjct 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 energy of 220 J. At tbjd.kut q.3:q he highest point in its trajectory, its kinek.qdq.:3t uj btic 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 msvk-jd 4 hs+.6b8x5,zsovvkv 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 slo vv+j .5 bss46-dkovk v8szx,hpe, 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 anhig:5enqx s8v9bkvy 7d o6 0kyz9 )7e speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of theihde:vy)g k 58ne o990zs k7vn6xyq7b 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 stai20h,q l:;cxxzk e )y*jedu2qrts at a point 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 ; q0jl*xzdcxy2 q) u2ek,ieh: roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of thejatq77(js* af 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 away up4u)04ex5fia: a vnjccad;* from the vertical axis and released from rest. What will be its speed at the bottom of it f)e45pua4 idxcv :jacun a0;*s swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially unco wpeu,(zj j*m4mpressed horizontal spring with spring consmjezu 4(w,p j*tant 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 axqvkh2(*hcyfp 6:gu io)x((i red light. What work is done by the friction force against the wi(x pxc vhyk:6 ufg(i(o2*)hq heels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal saw+ +rtx69henurface is 50.0 N. n6hexwr+ +a9 t If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, 8hf41swfr )og3 ioxgp,:)yfd level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slr xhof fd gp8:)31,4ysi of)wgide?

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. dcad* rzzx)ig9 -g:2 e The cd *ie)g-zcrzgd:2a 9xoefficient 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 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 rysr-vyr 9lib/ir,k/. est from the top of a 50-m high slope. If the work done byrvi /r yr/lyib-s.k9, 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 m long and rihk:ho ny, 4rvb4:xwbv sl6a9* ses 2.0vor4lxy a4v*,:: 9hk6 swnbhb m. 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 from rest at the top of a plane inclined at 20e abo arbkf5kb :eru58y3(rve horizontal. The coef 8fkr r 3b(ua:5rbyek5ficient of 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, and strikes the grounfy 7b:b b0pix2c(tcq1d with a velocity of 7.00 m/s. What averagec2qp xy(70 f:itbb 1bc 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 5geca jig:pe1 0)tih;j5pc xcs);d9q up a flight of stairs 10.0-meg:j)5xetcsi j p id);5 qpa0hg1cc9; high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a lqbamh/m3 tt/.1y6njy1i *o f constant velocity of 5.0 m/s. What / qjf/1tl136ny*ty .hmamoi bpower 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 used by a 1.0 hp motor that runs8t2(qxolro9bmfv h6k3e s3 q pgu60t 3 for 1.0 hr? (1 hp = 746 Wgt2vu8 txeq6q ompbo3(3r30k6 9h lf s)

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#

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A cyclist does work at thektpckv(1 /q l, rate of 500 W while riding. How much force does her foot push with when sh(t 1,lk q/vpcke 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 d,-h(kmz-ye7 z3erkmn wgt)60 to 25 m/s in 7.0 s. What is the average power delivered by the engine? ( yhm3z7ge dk6m, (-z-r ktnw)e1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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