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

1#

What is the correct unit of work expre 3uretu xnga5ii: 81555synbtssed 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 eg (k(px c b)d e9:1calzep,-oa system if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amount 3l/l puv+ y-wwof work yoyp wu+3l/v- lwu 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 being held theqf20:j 7 tjbsclo,o)ere. How much work is being done in holding the boxetbl)o jjs2:f7o0q,c 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 carrkk+w d:1w7 fruv1ou a-ying a 10-N object, the amount-oru u w kvwf:71+ad1k 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 4b z8vj-jei9 (j owne5then returned to its original position. If the total weight is 30 N, n84e bjwe9zi j (jv-5ohow 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 act+cej.vgof mq58q; hidy- d) w-ing 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 of the work done by gravityo0ql1fm trp+p)aq +z1bd9ef 8 while the ball goes up with the sign of the work done by gravitob1 pl+ 8r ft+aqme0q1zpdf9)y 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 fs w(ibah p54 (nbo zex+0+kf7Force versus position (F vs. x) graph, representsohb+s 0bk i75f(4wx( f+ne zap

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 reprajlzqw3( 4 -c jxlx93vesents the work done by the fov-l j9(xq3 cazwjxl43 rce 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 t1bhh cs:b4+yxhe 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 oxqqkb;o e1b:w bj4ks.3a : h1ubject is negative, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, thenn )-p+;9rko ghjqqjyua 5i:sb 0v/wb/ 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 ca :ek:k;suyx9kr, and is moving at twice the speed of the car. Which statement is true about the truck's kinexy9e kus; k::ktic 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. Ty2 s78idfp*k guwp.m7he kinetic energy of ca 7sdp kuip7gwm 8f*.y2r 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 wallm ( zp*3r)lxf3hkv9/ b j-kroq and bounces back with half of its original speed. What is the ratio of the fhvbrk- mplfxqk r/3 3*(9zo)jinal 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 s lb sxnh:g+ul59xh1r 7peed of 3 m/s and a pebble is moving at a speed of 5 m/s. I7 bx5rguh+lxlsh : 91nf both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is/ 0t*7m/qxs5 bk ;iichm xufx7 -5(t3b hyapxt moving with speed 4.0 m/s. Both objects encounter the same constant braking0b-bi yts/7 ;pm x a7 kx(5m/* cxxi3hhtfqut5 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, .k-amasary 0 il: c /b2-n1gvnand skid a certain distance on a straight, lelsv-2aib-nr:a g.nc 1 yma/k0vel road. If you had been 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 mass orbits the Sun in an elliptical orbit. Neglecti 0ji.h 0s zepaomn54w.ng any friction effects, wza4wo.m i.ep s 0n5hj0hat 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 principlefxce trq u*h y6l*+a,00dt3 mi.

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 potential ene1uj lljqoc 9b*s9h8ny 1qih22rgy?

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 vob 6p0c5xqp/a height h above the ground. A second object with four times the mass of the first if released fo6qv0pcxp b/ 5rom the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes i2wg lc zh42 9pnw4v sh:y13oyjt to stretch 5.0 cm. If another 0.200-kg mass 2lwn2h9gy1sy:4jo zp4hc v3wis 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 systey ja)z:o.n vs;m

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a z15n,;ndw*0er r ac- 6nxu28rdl hqyftree. Compare its kinetic energy K, to its potential energzr cu-f aew*dnyr2;,d1 hr0 8xn6q n5ly U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of az 97 ffes4tku3 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 r+/s lsi qzyc)w+1ll 5object are sliding with equal speeds along a level friislr+/wl) 1qly cs5z+ ctionless 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 r0 ;v18i *) vvsnwm6cusc(2qblqu uf0$m_{1}$ 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 energy1y jwsj) g6 n):wqxrc. for conservative forcesxjw:rs jy)6c. )n wgq1.

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 frictiz5l)/,:b/ge5,l;kurbohlr ye sd7 ou on is present), to the gol b u5,eeul/7b :rrs; /,h dz5kolgy)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 kinetic energy. Dlabf j (d(i-f**pxf:e(e .j2m d,nvhy o not ignore air resistancjj. pfh(,-n :*d2i *al eyb(me(vf xfde. How much gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitatio:yv pyx19 e82tgep ij6nal potential energy. Do not ignore air r8ve2 6:eixjp1ypgt9y esistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conserc k iam4(56az ujqth42vation 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 iszh;q4:chio-d4*m 6wer uz2p c

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 unitszsi77/r 4j w3g,d 9lieuwlhu0?

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 uk;o.ki4+ (oizruzo( 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 ini+5b39n r; qvm/ozp bik u-wk1 one-third the time. To do so, your power output must hab;9n pwq/ 3bvr -+ki1om5izkuve 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 a-laltn+81-e dsql ms3p( gh8fcceleration, 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 objecc6.uytuw.(/y ::ueh k;o y b7m1siqkk t weighs 90 N, how much work was .;iy.csoe(um kk u b: kywt7q /:y61uhdone 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 distance ofq( c+. noov39fvqvw 3j 1.0 m, at a constant velocity of 0.50 v3 qj+(cw. ovovnqf39m/s. What is the work done by the weight of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5v3tgjb8w //rz,qtq 5d500 N for a distance of 50.0 m. What is the work done by the 5500 Nt8/tw 5/rq vg, zbqdj3 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 wpp m0,kr ae0o:ith a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight o,mp0k:r e0ap 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 pul6,unbqb b6n)mled upward with a constant force of 5500 N for a distance of 50.0bqn6b m,6u )nb m. What is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up along 2 nmg 7m7v vq)e-t:btpa $37^{\circ}$ 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 sli2 zsy37 (g+zelovqo-r 7qh eh*des 8.0 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 onypa(+wvz;wn ( ni-kycv0g+ta h o*11 p an icy surface (assume no friction), with a for*+anpyzvk 1ca+ 1( -(itw; 0 npvgwyohce 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 th;jcm w;4) six+q-rycr e force. The graph in Fig. 6-1 shows the force versus the object's position. Find ther;ixyq- j4;)scwm+ rc 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 obj1dg79eyo. v soect in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done se71 .o9dovgywhen the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The pz a*wp+o e1)0bitk 3hgraph in Fig. 6-1 shows the force versus the object's po 1hzi opp)0bk+w*a3 etsition. 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 t3 4a ec-fwe- asuqual7p4 x(8she direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the wou 4p 8clsfaaxea qsw37-e(u-4rk 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(t c :nmxju3h/cd**qd 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy ofujc/cxhqn*m3 ddt (: * 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 l w2o13aft2j9ja b) +enhzq1v a 55-kg cart (initially at rest) across a 10 lb aw2q o+j2h)z 1fjaen 9v31tm 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-zm rm,m*d3 kp much work is required to stop the m,mzmp m*-k3rdass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s,qa w05jra 0c.d what distance is required to stop a car moving at 50 m/s under trda0aqjwc50. he 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.) w55ec6xm*g ebteka gun propels a 10-g dart. It is cocked by exerting a force o)e6cb .m 5*txkeea5g wf 20 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 horizontal component of 80 N and a vertical c6eu*io9 )qe)uilau 4l: xz1 otomponent of 60 N. The force is applied to a box which rests on a level frictionless floor. The z u6i:qll1 o9u)4)o e*ex atuicart 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 hkgv3 /lwmrmje+28q 9norizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stoppingm q/wgr3mk8n+ 9vej2l. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.nv+ kr1ef79 f (xytgh;00 m above a floor to a height of 13.0 m above the floor. What is the change in gravit ;feh1n9 t x7+vyf(gkrational 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 l vpk q3e(q.uc)ong and rises 2.0 m. If the plane is pqqveuk(c3.) 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 sprin ( *)ybdq-f,jr9vtrfsr kj3) tg, causes the spring to stretch 2.0 cm. What is the spring cons jd)fr3b-)f(k,rj qv9yt tr*stant?

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 potential e33 13zrbkeq wj t(xh6wnerw3jx6(13rwb t3 ezqk hgy does it store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncom .o2zypz1uo /dpressed spring with a spring constant of 25 y2 oz.z /1pudoN/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 stretchzhsol.dd:j:+ zfm 0z4 a spring of spring constant 40 N/m from x = 0.20 m jo0 :dld+s:fz zhm.z 4to 0.25 m? (Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 vxp,nr m 69nqzqvf;7,cm. How much work is requir9fnv mxzqn 6pv;7 ,rq,ed 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 fro6qz 6q/bl0p44tcerqw4jt , bw m rest from the top of a 50-m high slope. What is the speed of the skier o, e4b46zqtqb w0l/ p6tcw4rjq n reaching the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the to 81bjzyr k.qn1s3 lbu.dk*l :gp of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after droppingz1 kgrb * 8.kbn1q.u ydl3:jls 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 thew)plb 4ai+) kivp+ sl, bottom, it has a speed of 9.80 m/s. What is the vertical height of the )ila+ pkps +iw,4blv) plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, its potenthdoc. w0nt l28ial energy exactly eqwhl.n oc2t0d8 uals 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 with a ki ,duo5d9 qpquzvws0rx0 gw+ij6* m f/6netic energy of 40 J. At the exact top of its trajectory, itwgqdr m6jus6+ *i0f 0wvz oq9,dxp5/us 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 ener(4 m:oic)ji usgy of 220 J. At the highest point in its trajectory, iji o):( s4cimuts kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

A. $\frac{220}{mg} \; m$

B. $\frac{120}{mg} \; m$

C. $\frac{100}{mg} \; m$

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bot4(;y 3c tapnbmtom of a dip (See Fig. 6-2). Neglect friction, what will be the speed ; nba43 mtcy(pof 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 sp lw zj*dns-e2cm,wta/ po)g3:eed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom l- 3za c,)wndwt :/mpjgo* s2eof 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 3u /bx.p8 tl:6u ()vq*jkjjm id0 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglectjjtiu l6*)dj b/xmq(. 8 pv:uk friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the:glnwd0yu5hi5fgt0q t5uz. * ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is scwhogw1 dv +d10145+kxhsjspulled 0.13 m away from the vertical axis and released from rest. What will be its speed at the bottom of its sw+5v j 1gh kwsd01ox+ w1hc4dssing?

A. 0.1742 m/s

B. 0.464 m/s

C. 0.697 m/s

D. 0.581 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizon ju zonvl 7wr;u*dwrm(zw.***h-ek *rtal spring with spring- m;u**d khvz*jzw *or*nlww eru7. r( constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg cagr u-i/d,xy w+r to stop for a red light. What work is done by the friction force against theg r/-,dx+i wyu 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 a hoco laaaaw (20 li98; lqeec))grizontal surface is 50.0 N. If the initial speed of the l ( oe)ql0)2 cwe9aaa;agl8ciobject 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, level surface. It has :og/n i 3 -mwb3c:tjxy24 J of kinetic energy. The friction force on it is a c3m/:cyb3iw : no-gt xjonstant 0.50 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 levelo0anbik smy(:tk/e y 22oi3j ) surface. The coefficient of kinetic friction between the mass and oa2o)iknbitmj y /e2:30 syk (the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. If tvy3,k.ci697 rqs al l yi;bdj9he work done by friction isli 9 3db.v ryy,ciasl7j kq;69 $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is push/fu,h;fgfxx (hq0qpa-v vp33 ed up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to thevqf;, vxahxpg3uhp/ q(f3f- 0 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 29;-oub ip eg9qydt6habove horizontal. The coefficient of kinetic friction between the mass and the plane is 9op t q2heg6ib-yu9;d0.20. 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 ground wizqx8xwt.msb23 f3mo )qxwq1s3* b -llth a velocity of 7.00 m/s. What average force of air frictio qtmx)wblmqz.q s8fxbw*x3-2l3 1o 3sn 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 ruofybq ir(:3-o4 z*w 8g;:2jui xxo*diohp0k hns up a flight of stairs 10.0-m high,hxph ir 04 ;o 3zof-jky:oo w*g(idxb: u2i8q* 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 jb0o bn p;jyq8m,c1/u constant velocity of 5.0 m/s. What power must be delivered to the object by puymj 1q;b c,/no8bj0the 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 moto/ +y fc;m/ue jlm(+aiph h(dt+ytl; 9dr that runs for 1.0 hr? (1 hp +dd// e(yyhc fj;9+miu;p( htm+t all= 746 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*m:v0ef bl;h k rate of 500 W while riding. How much force does her foot push with when she is traveling at 8.0kl0*:v ;m efbh 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 is the average, au/33 sxdrpl power delivered by ther/sx3l, 3apdu engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95