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

1#

What is the correct unit k )6c)y *4vn9+cxdmfcfk; zonof 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 swu0 d m /t)6npszds)+uystem 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 b,r:jgys*li h3v irus 3ec809wlm8 5xprick wall, the amount of work you do 8x8gy0llim r ehij ,p3scw*9rsuv53 :

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-0f yb.7 ibgvv being held there. How much work is bein.0-vbbvig7 y fg 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 velocity c2;l*6eq /gl kde8v: xbzfzbd+p k b++larrying a 10-N object, the aegz;bx: e8vkb+ll *b +f d2q6l d/zk+pmount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returnj ul0b gxq+),wed to its original position. If the total weight l u)g w+0xbqj,is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on q6 qy w;q f8;j+1+wfyslze oksm*5y8 qthe 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 do p zsd(r,e710hemhs3p ne by gravity while the h713sd ( ,ehzrsepm0pball goes up with the sign of the work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) graph,ox8 4un2dmh s6 qz6ce( representsx4sm( ncu8h6z e6d2qo

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), z*qjyci4 x )z,pwjzuo 60b /1iwhat represents the work done by thez/,) iy*c w1p ozx b4u6jzj0iq 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 object's kinetic energ8bei olr0v 3rt+jo auq2-16ety

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, then the object's kinetic e8ri 1sj0qjj1ovzz; p 6nergy

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'sm u9( 7mpjmnkr9uek07 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 atywhwa 3./ebv; twice the speed of the car. Which statement is true about the truck's kihye/ ab. w;v3wnetic 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 masx079:dv2dzc2h*a 8 r ibe:fey7f.rbcnt,yaws of car K. The kinetic edyt ec.f,a7id :rrb22 7x9:hebv*c 08y wznafnergy 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 backh k3*jb:3 a+oqgoyo. i with half of its original speed. What is the ratio of the y:o *k3o .g oihqajb+3final 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 moving at a :cdgo2*hdmrs0 v08 zlspeed of 5 m/s. If both objects have the same kinetslg :dmvc *h0o20rz8 dic 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*6a 9r)g/c yl bnlzl:t m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before btz/r:9gnal c)*l 6lystopping?

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 cer/,zr; 4htxyo7,tij.s tnn 6dg tain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same co.j i 4,rs/n6t nz;dgxt ,ytho7nditions?

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 orbi .ursj+yvy(sw: 2-kio t. Neglecting any f2o is-.u ykyw:s (v+rjriction 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 principle av9 ldvm f*04mfj2gb-ae1 pc3.

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 t-05fc6p re1 jh jawz:6z)8suczzz o(ko have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h above thex*qc*:a1+ q.erhlr 8o2 z *lw xlth9uz92vcyd ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compzz lccatqurq9 y*l.8+w:12vxex oh *d*92lhr ared 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 yd - cno-(1d;f dt+omcto the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to nc odyt -1+cmof;dd(-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 syh ;6/e:wu*h bmdd)kl mstem

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 ava(e;s;uq c0m tree. Compare its kinetic energy K, to its potential energy ;;0( auc qmevsU.

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 l. 7vys8kpwcx +)nk,c of a car driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very hea vybzi1s8l-nig8 i.;0jklmx. b u3x 6avy object are sliding with equal speeds along a level frictionless surfvb3i..-knz;gl1mxis06l 8 yaixj 8ubace. 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 /uviympb40n5r4 xp 0r$m_{1}$ 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 sgb)0lrhi;/o of conservation of mechanical energy for conservative forces. lhg or0);/bsi

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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 friction isgs8mo -e nxt ish 5mg)6o*r+8e,x+dal present), to the ground below. How does the kinetic energ ase o-me,m 8oxl+g5rt )xh+68*sigdny (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 ofca:d p4d r;qmm; bwed941zr 8n kinetic energy. Do not ignore air resistancrdcmmz ;81d :pab4q49;dr en we. 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 an)bmun(/f z;u2)hs .a zbfuoc6 d loses 30 J of gravitational potential energy. Do not ignore air .msafu( oczu/ 6z)u2;nh)bfb resistance. 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 conservation of enb (pf*oi6)ms -c,oirnergy.

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 is i.:+fgqlw8 qdaw). wcpr.c5l

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 fi*zcu5grbx 4 l8evx-q,xd94rv04ch 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 qeolbci1hk2 - 5mi: x/7hztg.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 th qwq,: k1bi6ome time. To do so, your power output must have bmko1: q,wq6i 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 engine mu;ji6ss wdgpr , g07gt3st

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 therei eeyfkvc /.::. If the object weighs 90 N, how much work waev/yek :i.fc:s 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 airi2 h/1bc rw4a7 cugfh9 ds;iegb(v29 u a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the shwr(cgvd21;/ g9hbi f4 2 uibua97ec 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 fori8o4 npr4*pnw i4 kaxfw( 0o6z a distance of 50.0 m. W44nizo n w iapk(6p8xwo40rf *hat is the work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a corq *)ld-w; hyvnstant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of v-yq* lhdw )r;the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 ;ttb2 av: * tdll3mj:zN for a distance of2:v tdb3a:mlltj;*z t 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 h 7chdsjo vku 0m23k3,a(n9sd up along 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. 7x9hyo ;2yfnz0 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 apa 2h3y2crcn-jz8( ofb6g6 t a sled on an icy surface (assume no friction), with a force o8yg-na2 o 3zbc( h2ftpa66 jcrf 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 thn2rb9 4pix *ogod6u.i e direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fin9i6u.*n2ri px od4gbod 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 db)ve bme:6)k 0q-kh pn +wsx4hirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 246b :0sqh+kmxhpnk-bv) ) ewe.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 9 offs+w) x:vtdirection of the force. The graph in Fig. 6-1 shows the force versus the object's posixfv+) 9 swf:totion. 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 th/wpt91 iqp mqzt1e 9nji)3vk 1e direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 01ijz )w 9m/ epit9pt1q1 k3vnq 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) ess34e9vqgm a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic es 3m9e)4qges vnergy 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 motwt af2gx/m 99qh r9m/ve a 55-kg cart (initially at rest) across a 10 m level surface. What is thgt9axtfh99r2mm /w/ qe 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 0v/4: xeyop*7w smlyx )r3bb 69skctmrequired to stop t e xo6c b30 *vb:4px7/sw9yylmksmt)rhe 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 movmn6avqr+f dpy9e* 8gz (otk2,ing at 25 m/s, what distance is required to stop a car moving at 50 m/s undea+ n9t6qrg(vd82*f ky zo,mper 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 forcejmytz2 g;lt,4 of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligibl2 z4mltjtg,y; e 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 compowk6t20/p7hwl b y( enznent of 60 N. The force is applied to a box which rests on a level f wth0bp(7l6/zwenk2yrictionless 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 42 p9yxpz)era8fwf i8 bic9q1g is shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth o4q eai28cip z1r9wfpfx89 yb )f 20 cm before 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 from a height of 7.00 m aboeaikc5 u0q*um0z/b7;8aw jk rve a floor to a height of 13.0 m above the floai wum*a;b/ e7z80kj 5k rqcu0or. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4889k1hp q5y19ax ruvzs1i zo a.0 m long and rises 2.0 m. If the plane is frictionless, how muchah8v9piq1u z sa 819k5 xzy1or work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 1rddwttu - nbc0q3 g3+2.0 cm. What is the spri+t0-3 qnwtgdb31dru cng 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 pote(.;svy ul(i3d kt.t ddph2hjyi() h;t ntial energy does it store, when stretchdth;..iv( 3p)hyjti;yd u(tlhsk d2(ed 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 compre6d, t0pnhowb*8g+i htb4g/kmw8 yn;j ss an initially uncompressed spring with a spring constant of 25 N/m by 1;wbbj,wy+ tn6ht8 8m0nkg g4idhp*/o 0 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 spr hsz5.-ug5qn ting of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x = 0zth u.5s-5qng .)

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 constan,v )h yya,r9vsg9l-h it of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the9 , hv saryhyivl9g)-, 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 from rest from a xg-i e4xqob0; .tsopluj-5y /;;hitthe top of a 50-m high slope. What is the sh; pboqlt.s;g -0yx j/ioeau45 xti;-peed of the slier on reaching the bottom of the slope? (Neglect friction.)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off tjv 7fz0vsy4kzjmb+c5u((y+4z rpk 2ohe top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevationr z(fv4 b4kzs c jo+mpy 5uj027yzv(+k?

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 accd-,9v .tuto + w-d (tmjjqc, speed of 9.80 m/s. What is the verticd,(,w- -v.ucc otmjjqd +9ttcal height 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.utw :bcg( 4vb* When it is 0.70 m above the floor, its potential energy exactly equals its kinetic ener( u twgb:b*cv4gy. 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 legz8*gmwl fg40)rz0h lc+nsm8xvl8i 9vel with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical heiml li4zgms vgz h 8xn880rc*f0w+)9lgght 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. 4a1m i,n4vs nyo8o2xcAt the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it a44scm2 vnixo1,ny8o 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 bot6 5; p bvxmh4rkf1mik1tom of a dip (See Fig. 6-2). Neglect friction, what will be the imr k 6xmkp4b15;fv1 hspeed 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 startst a:- bcl7c ue( tz-u,kp2ih,v with a speed of 5.0 m/s at a point 45 m above the bottom of:evc7,2(cht-az, k bu tliu-p 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 of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with a stm/iu chh6;n 5peed of 25 m/s (See Fig. 6-2). Neglect friction, what wi5 6ch/tmh;uin ll 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 o1u0ca.gu. h;9vx3jk.p;jr ra sbm4sq f the 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 from the vertical axis z1xm le04c+ bgd6 mq.wand released from 0m6w. lm4e 1dq+cxzgbrest. What will be its speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompresse9dax1*h l3tjlm-ja7y d horizontal spring with spring cons1a9l atx7d h*mj3l-yjtant 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 2000yqc 0d(cq :f7h e+ueoc3mw8i +4+ qxpb kg car to stop for a red light. What work is done +h x+pde(ymc7 4qb o +:8qi u3c0wfceqby the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force boi(ix84 onn9r etween a 60.0-kg object and a horizontal surface is 50.0 N. If the initialoi4i9x nro8n( 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, level surface. It has 24f(hi4jw)c i,w J of kinetic energy. The friwji()hcwif4 , ction 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-kg mass on a len1 -ss, ii5bq0wi03z4k wj5qczwl .crvel surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distanceb,i 0c z5.si4lri k3wn0wc jwq1zsq5- 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 f *lxhyek+4o: *hc-.iqhrv-w qrom the top of a 50-m high slope. If the work done by frerk i- +h: *-.4vhxcwqoyqlh* iction 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 push w5.5tmuk h2d ;2jbqzked 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 the top of the plane. What was the magnitude d5mjbzt 5;hqkk. 2u2wof 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 abbt22 s.dq;li bh aic8;ove horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What 8;;chi b2i 2.sla qtdbwill 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 wid nnyx,)ve7 ieflf3,hr.8 oe2;h ft0w th a velocity of 7.eti x ; yeendvrwhnhf032o7,f l, f)8.00 m/s. What average 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 hebg- -y wm u2k.*yj1 djgdti-h(: m 3*ms9ppeun runs up a flight of stairs 10.0-m1 y:-*gpe.wu d-hmy*t k n3mj-2 bui(jg9msdp 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 wty)yt36 y w6uuith a constant velocity of 5.0 m/s. What power must be delivered to the obj y66tyyt3 wuu)ect 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.gl;92iy. 5)ep;lug3hrzz h c g0 hp motor that runs for 1.0 hr? (1 hp = 746rggpz .9c3uyl; e 2);li5hh gz 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 500 W while riding. How much fduqv -7c eb,iemz5q2t;sh:0zorce does her foot push with when shv qz:mq u,dh752b ;0istzee -ce 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 g9qg v-)tm:kkm/s in 7.0 s. What is the average power delivered by the engine vgtq m:k-k)g9? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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