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

1#

What is the correct unit of work expressed in SI ula/pkq/2abe3jt 7d:myl d , w3nits?

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 02ht5 cj*dvs(tw9idg h6 vzs0is 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 a0kq.(zi 9/be/;r na1vfuwj ah stationary brick wall, the amount of work you d(f ;9a0 /wab.unqkez1j / vhrio

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. How much 2kwmjji ax+c + 9dnnuto-h*m0./- ffcjk:xs;work is being done in holding tom 0i+xsn xjhad mf;+j/cu w2 *k9j:. ktnf-c-he box in this position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity carryinbt cg0)h/tk6yo 7tm,ug a 10-N object, 0b tmt7ho)t6guy/c k ,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 e .cguhqjvd7pxw+.7otw aau; 4eu(-k* -ono 7m then returned to its original position. If the total weight -e xo 47u7cpo g ;+daj.qvw.*t-( ouake7uhnwis 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal forctcign+w 1bh/7 e 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 upgafi/ :-b rgo0wdi -i;. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity-fbga:/;0 wd iiig-or 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 poc-ndo y;li w9)sition (F vs. x) graph, representsio;)d9- wc ynl

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 ven pkb0mb9h) 3arsus position (F vs. x), what represents the work done by tpb9 3ankb) h0mhe 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 onfkr994 6vhpcukz2p azz. e2 (n an object is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object jnzhgcthk/-)u+0 e7u14gyaa '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, then the object's kinetic energ/+2 se r*qu jr4xfr)fxklqlh7z071vh y

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 hor)l dh *w;8 )-aifa mv-8iuxmuch as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic ener8rwd)a vu * -hia;if-x8h ml)ogy 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 z7 dvoz- vwx29 8g5 )ypibkim iaf7(0hthe mass of car K. The kinetic energy of car J, ihyb(7vzmaz8i-2gwkx 0ipfo 5d7) 9vcompared 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 of its orwxexz9k pbn4- djme0;4sk: 8xiginal speed. What is the ratio of the final kinetic energy to the initpes48kx n 0 z9eb xdxkm;-w4:jial 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 movi)lbt6(u 75jp) yjm blgng at a speed of 5 m/s. If both objects have the same kinetic energy, wh7(u6j)yt jll5 gpb mb)at 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.+s(y 9u:cgp ku0-kg mass is moving with speed 4.0 m/g+k:(cyu pu 9ss. Both objects 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 car in a panic, and skid a certain distancbi:f)vwd0 sk k;1s x(qe on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under thikq fws x svk0b(:1;)de 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 el-u) is,s9g6 lyitg0rmliptical orbit. Neglecting any friction effects, 0il ri ,s-g y9s)utg6mwhat 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 prinyim gvyrz1 / ncjg92+)3ppzq6:38:ljnhghhuciple.

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 p/qstc1t2zh ;v ldt 3b4otential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest avj1q ;55w y(rj6qzhfg height h above the ground. A second object with fou(jj5fv1qwqz;y h6r g 5r 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 end of a spring causes it to st+ l.yk9h6- cr68q rycniu as/sretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring wil yhikq.nc -rs+ l/a9u6ry6s8cl 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 system*m wvw43w; .nppe w6s)lun-rd

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 :hgv5c n;jgw2 energy K, to its potential energy:;hgnjw 2cgv5 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 x,0gwt ++sgv4 0cuxxfa 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 gw.p(ty4d9; r99depane ps*30riuej very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same yide(4.u0j ptsepa*nw e 3drrp9;g99frictionless 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 uztc(3fp v p5($m_{1}$ 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 ofr2lpowi 5 6b4y mechanical energy for conservative forces 2irw6l 4b5oyp.

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 (:+k7x jn1ce ica2.3,jdxv znz0; synl air friction is present), to the ground below. How does the kinetic energy (K) just before striking the jaijl 2nzc;kynv071n: dsx,.e + 3xczground 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. Do nott scqx7b0r 2m jznr0kbwb()+8 ignore air resistance. How much gravitational potential en(jn q0zsckbwt m+0)b 2x7br 8rergy 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 99 qxbp 6vweor1 mg4a(and loses 30 J of gravitational potential energy. Do not ignore air resistance. How mu4wx6o pb99e(vgmr a1qch kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of ener*5w u-083u,7va ulta jfjw usqgy.

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 is5u rsner 46;k l -mtvvjd7xo58

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 S sj3 5gz8ce,7qy;z k (3vjemj :jqwv4gI units?

A. $kg m/s^2$

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

C. $kg m^{2}/s^3$

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of powa +*s-lx c*4ykkzsm.d er?

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-thirdm 7kndu o13p/gp5sh p4 the time. To do so, yp15 7u p4sp /hko3dgnmour 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 engis;l ;xkb8s)fcne 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 and8; ) 61wk qomeap .hjj,j;ffog9bwi/ m held there. If the object weighs 90 N, how much work was done in l egj6/fjib ,w mh o;mfkjoaq9p;18)w.ifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m4.8m gu*j(wq pefu:ot, at a constant velocity of e4umowqpju8*(t:gf. 0.50 m/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 5500 N for a distanco 0( duvzlnui e:v-*;ae of 50.0 m. What is the work done by nul0vo:(zaiu-; vde *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+9:o-b7c6y(b/inq wi s+* s rdlgjzdb with a constant force of 5500 N for a distance of 50.0 m. What is the wor6 ir jbzqco7i-yb/*+ w l+ s9(gbdnsd:k 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 cz2qap56 3 qoyqqyb2h*onstant force of 5500 N for a distance oap q2 h2z5*oqqq6b y3yf 50.0 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 alo*igkj(n++ ixl -duqe /ng a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 mflg r5; 7il(zhwi0dv0uo:b1 f 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 sistep:fls /go.4 tgr Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N /t4gso. lf g:pat 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. T/q tk *rcio4w5xh/p )ow/us ,khe graph in Fig. 6-1 shows the force w/xq* khsw/pc ,r4)oo uik5/ tversus 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. The gra x rw*uw6m+9feph in Fig. 6-1 shows the force versus the objec+6 xrwwmf *eu9t'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 object in the diri rar9dg-1 9w o,n4j4oslhop 0ection of the force. The graph in Fig. 6-1 shows the force versus thhpgarns9ow1 jri40-o 9d4 ol,e 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. The graph in Fig. 6-1 shzs0sudwb(g 7plc5a,;ows the force versus the object's position. Fi d,5;wc lpu sgsbza0(7nd 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 200ooyq(d;r:8u uq7zx 6i N is applied to move a 55-kg cart (initially at rest) across a 10 m leve: 7xoqz 8( uorduq;y6il 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 (initially at n()1hs tlqapd.zp s/1 8 ,empgrest) across a 1 lspzp/d.t ()ma1 q8e n,sgp1h0 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: ume9 9 :jhyoq5p w3z/nb,gzq/s. How much work is required to stophqz3eug/yp:wqjm :59nb z,9o 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 il :+l oczu7onz *xaziy6+6( hfnitially moving at 25 m/s, what distance is required to stop a *znxyzuacf:6loz+6 +i ol(h7car 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 coczn/msqoprpji3b* /.4 osm23mked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the opm *o b/ p3nzqis3m/js2rm4. 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 1ln+l98 o lymfa vertical component of 60 N. The force is applied to a9onylm1l lf +8 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 horizon 17eq wk h5o5(tx4wpfytally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm befx koy (w5p4tf qew5h17ore stopping. 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 +vcy7v7ia 5wqrxq)fh ,epy/1from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational po7xhyyrfpq +w7 a5 )qec/iv ,v1tential 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 pushedd 34+7ayvigdk7 5chbjv-i5jt0w;qb*9a xppo up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work b7xd qabt +yia *-pc7h d4 jjwk;50pv59g oiv3was 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 m;:z2pho d,wh(m;bqp a spring, causes the spring to stretch 2.0 cm. What is th; o:,hmpdz;(q2bwp hm e 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 muc+pfkc ; 7.zefburg8n6 h potential energy does it store, when stretched by7p;ek.ub ff6cr+ 8 gnz 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 t: e5no*aif 2 p3t*krzio compress an initially uncompressed spring with a aitpi3nfkz:5* *2eorspring constant 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 s ;3i) rgpyeb,-r4urtgw7l r5wpring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0.)rerit5uw) gg7,rw 3-4 ;blrpy

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 comjc+3q fkw 4qoynui/07 )*cfyt xqdt w77/e7ngpressed by 3.0 cm. How much work is required to compress the spring an 7wqtq gn ne3/7qy70/t cwkyf ic u jd47fox+)*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 from rest from the tow3gj 6v9)pod*v-bh8 quei -j 1mnw ;ge)1svt yp of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect fvo8;9b*h v 3--styqivdwnmup ej1)g6jge )w1riction.)

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 thhbk9u j jz7plu (,mno27vt0r :5*chqbe top of a hill with an initial speed of 4.0 m/s. Neglecting b0*2 oj:qjhkr7lpn5z uv (h,mu9bt 7cfriction, 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 th3l4a* oufr4cq 1q* ooge bottom, it has a speed of 9.80 m/s. What is the vertical ho* 3q* 1qco44lagofureight of the plane?

A. $19.6 \; m$

B. $9.80 \; m$

C. $4.90 \; m$

D. $2.45 \; m$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above then n6v/ylo9cls1j3 wdfb q.()u floor, its potential energy exactly equals its kinetic energ.u3/ 6s ly9fq1 b(wo)dcjnvlny. 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 zaj8o1nrooi; * fc1,sa kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 1aoi1 nc,zjr8* f;1s oo40 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 g x dtsma-0j+gq,zs*qe j/wl)mj z44 3fround with a kinetic energy of 220 J. At the highest point in its trajectog ,s*xtj s/3jmmjdl)e fqqw+z a z40-4ry, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom of a iy9 qqe c)+d,bvau g6/dip (See Fig. 6-2). Neglect frictio9/ a,)ig+ey6qduv cqb n, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the botto3fn i.thwh) * c(t:-lq h )dm 33vcjva;kqo2whm of a dip (See Fig. 6-2). Neglect friction, whadqhvhh;ck i: -qmlv)( ow.wjt3tc2n3f*a )3h t 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 30 m above the bottomwtun hv:pe(i9cypv6m 6q4) p* of a dip with a speed of9v qne (p6)v4ypcm6uh *:ipwt 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the ball at2i pm37ov3 lpt 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 from th 9poqg*)h wr50t,wjk ):loszye vertical axis and released from rest. What will be its speed at the bottw,sywtk rjqo o))59p0: h*lzgom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed horizi5 35z8wxjfp8bb gph:ontal spring with spring con8 g5w:jpbib5h p8z fx3stant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red c 9+ ;t3rfo2oq zju muf+,7xzqlight. What work is done by the frictionf zcr3qq zj u t+xo;9oum,2f7+ 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 a horizontal surf ji0o0j+ okel6ace is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide jk6 oo+l 0eij0before 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. Im.wnil* di) zit.g5;2v rug-ut has 24 J of kinetic energy. viudigg..iul;5 z- wr mn)t2 * The friction force on it is a constant 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-w5 skan,u9l:n3brxu ,d;try2kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m:y2r b,t ;lwusak9u3n5 n ,xrd, 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 f9hw+ qs*3od6ljdzj m:rom the top of a 50-m high slope. If the work done by 9z+d w3*sq6hjlm:o d jfriction 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 vy q4jacyd2 rh( 3 -8+8xy) oxuuu0gkfrises 2.0 m. vua28gqyuxy jf -x+o(y8dk 30c 4hur) 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 inclixp9 vq1m5su8g2.p kh vned at 20e above horizontal. The coefficient of k12ukx8pm 5h sp9vqvg .inetic 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 gry7kdj2 c0/ +ji ra6ypgjp+dn 3ound with a velocity of 7.00 m/s. What average force of air friction acts on ir32/y jp jy+i kjpdacg0 +76dnt 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 flight of st d9gjub+1nbt* airs 10.0-m high, d*j9ng1tbub+ in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velov3+8 ,5rhyrqo0cywvj city of 5.0 m/s. What power must be delivered to the object by the forc5yhq jvry+8 vr,w0c3 oe?

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 runs for jaizd(5* -,yag wiql01.0 hr? (1 hp- 0ai(5ql*jad zy,giw = 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 rate of 50;vtd /f7 :a :nt/tlkpi0 W while riding. How much force does her foot push with when 7: tkt/ /:afpn;vlitdshe 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 iscq d7:nmxrsw4. 19w puhup1r,pc/2 zi the average power deliverd1cu2u i9mw:s r,41/qp7cxp zn .wphred by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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31	32	33	34	35	36	37	38	39	40
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

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
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