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

1#

What is the correct unc6a asj.pj: 95e3w4hv 4fnphq it of work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is ) 1a:+rtswmy3l7ts0i c :rijpno 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 amem3 xx238jgz: ,xuo qf ka6ag1ount of work youxe2oqaxj3: g 63g m,81akfuz x 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 helk by--b fm8 j 4*dj1oek3q 9s-mzz7kdhd there. How much work is being done in holding the box j jb-8kh4ky zd1 bz dq-f* m79-mkseo3in 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 cdv ,/9ejay6acea9to 5onstant velocity carrying a 10-N object, the amount of work you /,etd6e ycoa 9a v9ja5do 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 returf;yr:0 offvae, -le(m ned to its original position. If the total weight ise: ; my,0vlrf aeo(ff- 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 forxi 8c;: zmr/ayce acting on an object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the u0*bck.cub w (work done by gravity while the ball goes up with the sign o(w*bucc 0kub .f 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 v0dw e3 zg) 1aq4a4feqpersus position (F vs. x) graph, representsweqp4a14aefg z3 0qd)

A. work.

B. kinetic energy.

C. power.

D. potential energy.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), what represents the work dongw) 9zg( np wl avd9ca -bb-9grsna0-5e by the f-g ( pgwc5 rvba- z9nl9a-0dagwbs 9)norce 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 +g d )7by0pto-eiiuu+ 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's kinetic3bhlj3 3vx z5q 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 thvwkoh:u1nf dkwg4 2;/e object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is movi,7bsis, bj z-ung at twice the speed of the car. Which statement is true about the tru, suib7szb,- jck's kinetic energy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the mass of ca0ec ac4a/ou o2 +us7dhwx q*w:r K. The kinetic energy of cardu7/w4hoe0 q:a o ac+*c2xuws 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 anda1ypetp v1n6j 3zul 3( bounces back with half of its original speed. What is the ratio of the final kinetic energy to the i3y1n 3zvpj6apeu l1(t nitial 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 movint( 4gi*hq5fnr ( -bue0u/jxh zg at a speed of 5 m/s. If both objects have the same kinetic energy, what is *gjt -i/ 4bfx(ehnq5u hrz(0uthe 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 ajf.w6 t7lf i4moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greajiw f4f.6tl7ater 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,.u0x hye5xcxyb) nn (iz/)5jq and skid a certain distance on a straight,5n))xe5u. iyjqx(zcx h0yn b/ level 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. Neglecting anpc3zk x4(n.c oq s.,g5bip h/ey friction effects, what happebx kp4nzq5ip/eg,coc .h (3s.ns 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 principv:jhd d etwqugqs1f 5f uu+2q/ +e/b4;le.

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 systdl .pf stu80eq;)yn( tem to 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 the ground. A second objectqz uk3pkc7*0bb oj rtpy)35v4 with four times the mass of the first btkjr3)45kq y up*p370zv boc 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 ;zip fg(l ltf3i w f+ex2wf*07the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the sl0l ;+2ig*7wie x3 ffptfzf(w pring, 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 oa95 h i,tgsu7t )fc;ypf a system

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 energ*gwg/widjf00c- oe dyc:n31 c8 pp(gky K, to its potential energy Ug y*-k wdj8:o(n e0p1cwp 0f i3dgcg/c.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a cc l:8*apyvbc/ar driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal d6 +cq)p3 :ytkleav v,:3k jd1hl0cz jspeeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height+1pavkyl)qj3 z c tld,:3cv: hj 0d6ke?

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 t hl1.da.(ab d$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

A. $m_{1}$

B. $m_{2}$

C. They both are going the same speed.

D. cannot be determined without knowing the masses

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33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservative u,8*kwr2u6pg5t+vin4zp qhp/ /p ynwforces./ tn u ru4kwypg p62vzq/ni+ *hp5,8pw

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, throughxik; pi3*dla5 the air (air friction is present), to the ground below. How does the kinetic ene dpx;i5k*3ail rgy (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 enerwkl kd10c:jk6gy. Do not ignore air resistance. How much gravitational potential e0lk:6w 1kdkc jnergy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational potegidbm 1w92gkg3g98 idntial energy. Do not ignore air resistance. How much kinetic ener2 8 i3g1mw dd9ggig9bkgy 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 energy.gdf8z *qc.tz2 dnh75 c

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 issl-t/id4erh)/(x1ap4 vuyqdvhb6(i

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 powerv4iym yc1iv-vbdm a)+ 9 au( (/nux/ki expressed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of po-v;b j zbhn5mjz91woo pwg;:1wer?

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 onlof 06t/ e2lyme-third the time. To do so, your power output must e0yf6l/2tmlo 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 ggz/m9hwf lc 3 l+6*wzconstant acceleration, 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 anv)nrrbq,t9- 7 8czyemd held there. If the object weighs 90 N, how much work was done in liftzm- t 8,97verrb n)cyqing 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 disty7h-10(u s5bvhfo ude ance of 1.0 m, at a constant velocd ybsoe 0(75-uvhfu1 hity of 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 puw -rm/zkh). i4y+ilhq3j m/r elled upward with a constant force of 5500 N for a distance of 50.0 m. What is the irykhm+ )q j3iw-/ 4erzh./ml work done by the 5500 N force?

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 55m i)7jpmm9fy400 N for a distance of 50.0 m. What is the work donefmmy)4pi7 j9 m 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 qri 3kd7d(sns /7nr c*constant force of 5500 N for a distance of 507c(si3 nk7dd /s n*rqr.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 mml6-i dj9sb4(1dc xa q 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 8.0 m down a raap;- vypb pmen(/51l ump, 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 Sarah5f;chz t;qd l) in a sled on an icy surface (assume no friction), wi;ql5c fth)z;dth a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The grapx b/ca81lvjzi0 bhp, :h in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 2.0 ib,8jbcv 1z0/:xhp la 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 qv1 a0 qk.twyed9+mi:ph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movesi9d0k :em.a w+tyvqq1 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 graph in00 m( ajjts1fwlnb+*z nov-9 klx;+vy Fig. 6-1 shows the force versus the object's position. Find the work done when the obmn;v(jly+* +zk j n-ft0 vxsob la10w9ject 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 3p. dxfgc,b(c direction of the force. The graph in Fig. 6-1 shows the force versus the obj( cf .g,pbxc3dect's position. Find the work done when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to 0l2dvmn9 n) /ze:go5gs ;bhfxmove a 55-kg cart (initially at rest) across m5/ n0sf; zhv2b :g ond9gl)exa 10 m level surface. What is the final kinetic energy of the cart?

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

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

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

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

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially h3xht9 (2w5 y0*l f9vmciuujgat rest) across a 10 m level surface. What is the finuh(j imx 9tu0cv23f5 9l*g whyal 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 30,2(qytzbhonr v n9cr):fm1uqdrd3 work is required to stoy02t9db3:1,v r rnc3 q)fnh (ouzqmrdp the mass?

A. $50 \; J$

B. $75 \; J$

C. $100 \; J$

D. $125 \; J$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what di2rjws+be h;- cstance is required to stc-b+r 2eh wsj;op a car 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 cocked uw:b1s d8m/rb(1 5/fmsngp dw by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the sp5/1wmr 8/s p:w d ngbudf1sm(bring 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 0-chf let6lp; N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart sta-0cf;lthpl6 e rts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, st0y1bac wne3 n/riking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping forcbawyc0/ enn31 e 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 liy72he36ux gerf qh,+ 7+pwdabove a floor to a height of 13.0 m above the floor. What is the change in 7dqhip3r ,+fw e7xule+g6hy 2gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The plane is 4.0 m long ,d +df9qous; 1pxum h/and rises 2.0 m. If the plane is frictionless, h hm pdudq;s,1+u x/o9fow much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. Why/a 3nl /.jxllat is the spring constantna/3jllly./ x ?

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 co8l:p 0asvg 6gonstant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm?g 0p6av8gos l:

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 uncompressed pzu((e zw-ncq:tx(e,0pz4l jspring with a spring czl:zu(e0 jtpp( 4nwcq, ze-(x onstant of 25 N/m by 10 cm.

A. $0.10 \; J$

B. $0.13 \; J$

C. $0.17 \; J$

D. $0.25 \; J$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring constant 40 N/d 23ac :yix4(q 2ju),xoxh ecx ucqe50m from x = 0.20 m to 0.25 m? (Ass 0dyqxxu:ox5ue)ihjccx,a ( c3q2 4 2eume 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 o 4sji8 i zvommzco l3/:z3+b,n: e5cpaf 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the sprip , /4oolzbzie3miv zn c+a::3s j8m5cng 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 the top of a 50-m 0ge /)a )ses /znq-nbhhigh slope. What is the speed of e/q es)gh/n) 0 -abnzsthe 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 the top of a hilgt;er tzd5 -nk9z8t6zb-evo,l with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in; d9zz8 tbk-n zevt -g5oe,t6r 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 fnjq )g u0x2n+urictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of t jx+n uun)g20qhe 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. mse+s aw6+a q3 When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How sm3s aa6wqe+ +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 straig26u nmsnt,oky 7 3mqk(ht up from ground level with a kinetic energy of 40 J. At the exacm tqk2yms,uk7(nn 3o6 t top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leav r/*yascju *:rz dhk ij:.;a:ves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch po;rhj ./vikdy:* a :r*u scjza:int, 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 bo l-d :ov t0daubi.np5*ttom 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 of the di0lb u*i p.av n-:ot5ddp?

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 bo p/ 7z omwo64q6l4 n-bcn,pjvzttom of a dip (See Fig. 6-2). Neglect friction, wh4wqj oo/zp-6m7 l pnvnc,bz64at 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 bottomq7y*rpzs;ku3v** x0js rwqu( of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of xuq0yq v* (*rrs3 kj7;s*wpzuthe 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 at the bottom of its swing (v0 vjqs+ .gi8a a y5()erc/xtipoint

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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 isu1p+wbi3xts3h +vg fok a,19 t pulled 30 cm away from the vertical axis and released from restttxk9hsgw11b 3va,p3iuo+ f +. 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 uncomprest0:sy tnh. (6ag:t- htqpj0zysed horizontal spring with spring constant ogt6shtpjz 0tq- :y:(0h .ynat f $2.0 \times 10^6 \; N/m$. 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 lighr spda()d4f:w t. What work is done by the fr4fwp:) (adsrd iction 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 horizont gjpi ) hjok7umf,*l0 *1h-sg x7qv;doal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distancfj*) phlh1 s-jgq;kou idm0x,7g7 * ove 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 y iwr);jx,e1f9*tyo y5ei (ki 24 J of kinetic energy. The f1,wxy yei*(oike ir;5 j y)t9friction 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 toj5e9pgg rj (q53y g-0axsmt 2r a 2.0-kg 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, what is the change in its kinetic enejrg5syt5q92 e 3 xm0(p-ga gjrrgy?

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 frz( r n1*vuvsc;om the top of a 50-m high slope. If the work do ;s1rn*(vvuzc ne by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an in4g lrz)vrwv4p9 + bktm+uq91iclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the boxviublprm++q vt 19k )4gzrw94 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 4mzi 8ufkr8+v; d v*kxfrom rest at the top of a plane inclined at 20e above horizontal. The coefficientmv8k4urfdz* i k; v+x8 of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a hcm 0e6 br5xhp.eight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air fricti0. hce5p bm6xron 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 usin-a uep+e zy805rdtd4n g energy when he runs up a flight of stairs 10.0-m dpe-+0 n4aezt85uy rdhigh, 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 velocity of 5p*dmps9fc ms--,n s p,.0 m/s. What power must be delivered tos,9s*-mmndsp cfpp -, the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used be56-k jnyii; ey a 1.0 hp motor that runs for 1.0 hr? (1 hp = en;6 i 5ji-yke746 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 rark(05y9 3bnnd fej: vute of 500 W while riding. How much force does her foot push with 0ndnfb 9ruj 3e:v(5kywhen she is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. W.evz0tc-b7;wh* f jiihat is the average power delivered by the engine? (1 h*07bzt ij;wcife.v -hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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