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

1#

What is the correct unit of work expres 4ojzazm( x9i.ia :6nziiq2j:sed 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 syste ,oj-p/a8lax mm 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 brivas 0r- ybx+)fck wall, the amount of work youav r0xb ysf+-) do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. How mucht/y .2v1qwr v tti/lb(g:5n po work is being done in holding the box in thii ./ y2(pwvlo tqg1rt:vt5/nb s 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 carryz:lbl v27l 5ccing a 10-N object, the amount of work you do ill2l5b7cc: v zs

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 retur r):(xx25vnpy yj)ogs ned to its original position. If the total weight is 30 N,gx p2 )n)yyo(srv 5xj: 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 xm o9q/abew*h;j x- vxslhp/ .748ax wforce 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. C9daj-s hw02b;rfdj qdq)( o y5ompare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.h y-a; 0qr9fd jo5q d(db2w)js

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) gry0z qbutk9ah3j-r (: waph, represents:9rw (qthz byk- 30jau

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), wha 2ziov(9t )hsw nc(7git represents the work done by the force )7niwvi oh(g2(z9c s tF?

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 z c)-* twsftz ydtglmn*; *00oon 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, tn(nzmo0 vu*) nhen the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zeroyw-b)6sem)hni tyn f /-jao 70, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much as a car, and is mon h5 ;rhm8m1zvving at twice the speed of the car. Which statement is true about the trucm8r51;nmhvz h k'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 t2bt/x mbi23h whe mass of car K. The kinetic energy of car J, compared tob2 t23mxi/w bh 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 oyp17bz/jf2w,vkrg94s ;egel f its original speed. What is the rati4w ep e/ ;lsj g1,zkbrv27gyf9o of the final 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 pebo0o*zv) x;fdh c+poj aq-gg3(ble is moving at a speed of 5 m/s. If b cpo) -*gg(3+hq0fx;joavzo doth objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0 kt( 34*meuww7m -fzdd-kg mass is moving with speed 4.0 m/s. Both objects encounter the same consdd74t3*-wmzwem u kf( tant 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 sqr n2v.mn74ficel8c 2kid a certain distance on a straight, level roadc4iemqc7l nv.282rn f . 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 (:hxy1jr n7d relliptical orbit. Neglecting any friction eyhxr(j1n r 7d:ffects, 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 princ eufqh8/ zi.d4iple.

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 pot5a68ewd i*x zsential 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 ihl:m(9*x oj uh*r.yr k-h7ue from rest a height h above the ground. A second object with four times the mass of the first ih yh kxrue(7*-*.rl imhujo:9 f 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 sprj*azjgc8(8wj7 * /ek(9 hvxx,gf dzmbing causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potenxj*kxz(vcj w,bg7/ag88(f hm *j de9ztial 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 sys 5j1 sufg fx8abj/p(l6tem

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to its pote w* dwg3pzlldo3ju,ht-:nu/ w), gy.b ntial energy U..h,yd:tob, /w ) *-3gpwwndz3 ugulj l

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a (xb.3*xx/:a48wxnmxpe i/ o lrrryv9hill.

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 atd y-1/eibe k/hh (;uj);w jcand a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whw)hkje/a/(bc;1 jhedy it ;- uich 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 lyu) ;/ -lpp4rl*pwlx ycid/)$m_{1}$ 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 enekurvmjke/ 00d1ju-np .n 7g)1 mk)fpmrgy for conservative forces.1j krgk0u)v/ -pe mf mjnnkm1)d7p0u.

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 p k9an) ggrd0d2-8co ojf5hxc*;2kmb (air friction is present), to the ground below. How does the kinetic energy (K) just gbhkacrkc2gonm8 d0x2-)j5 *o pd ;9fbefore 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 ooak0t 0dm dztac-*lq;57y1 v and gains 30 J of kinetic energy. Do not ignore air resistance. How m0- ; tcvyao1md0l 5t kaqoz*d7uch gravitational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and lose:0 2gow0 dfzuuaid+; sh67qits 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic ene;zf+620 a7sd o h 0iutudqig:wrgy 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/qko (bugc9 cv5wpx2 (gy.

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.sv:5s1k7a7gnuxvo sw 6n(al

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 expres .;ejx329fd9 i8jq.frc a glndsed 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 r tybs s*p yp490.czhs* ky*e(not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times hpj(+epr, tnkh a5(mto9 5 kp*the work in one-third the time. To do so, your power output must (kk9pmn*h5 (etrapop +h 5,tjhave 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, thsvrn m6-:jo 1se car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the ;lht m+ rcg):nobject weighs 90 N, how much work was done in +tcn)mh ;:lgr 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 bo9rs/do 1nggiao 8 1vkf14p3 book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the w1/pgof orkvd8 34b9o g11asin ork 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 550kvlm.p r,7je 10 N for a distance of 50.0 m. ,vj rpem1.l7 kWhat 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 constant force of 5500 N for+ bc 28- x9eep.hcm7kdqmaot3 iz9su6 a distance of 50.0 m. What is the work done by 89ciq72 9-s3k eaum pozth+ed.mcb6 x the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a distanc0+xy) ek jwpr3e of 50.0 m. What xw kp+r0y3e)jis 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(3/3 1sv+bbebpqjm jk .0 m 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 slidesjr(w b)jj ini9(x w/bn-8x ci) 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (as 7ap wh9uabd2+sume no friction), with a force of 60.0 N a2wb7hd +p uaa9t 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 grapheo8hmp/x /d w2 in Fig. 6-1 shows the force versus the object's positiopxo/d/28mw ehn. 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 graph in Fig. m05fnr83/ ecxd/q vj, 5dcun)pirze (6-1 shows the fopv 8zic5f c)j,5/eqe ( dnxn0u/r3drmrce versus the object'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 direction of the fo+d(.ioxyx vm;m; 79 uj te7fuvrce. The graph in Fig. 6-1 shows the force versus the oxim7v+t;fu(u d;x7m yjov9 e .bject'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 direction5 s0vq4r):p u 9wpixdi of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work ivird s)u9:q04pwx 5pdone 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 appll onqq ff,f 2/p+uej6+ied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic en,lf+26+/ pnufq qoef jergy 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 cartfua c/k;h ke3+ (initially at rest) across a 10 m level sur3c/ fae;kh u+kface. 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 wi rhheo e qe1wpur4la0:z43 8,dth a speed of 5.0 m/s. How much work is required to stop4e,183rhrwu eq:0 4oadhzelp 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 distance is reqq.06ek +jnaqj uired to stop a car moving at6.qn+j0ka jqe 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 d9 hv):p dwak+cocked 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 spring has negligible 9vw+adh )pkd: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 h (,hxc0 .ybla80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cx0(.y hca, hblart 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 gt/bmhi ,v: 9ki is shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 2b:tv,i 9k hm/i0 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 above a floor to a heig1q 4l-cj(2z(zcd x xdhht of 13.0 m above the floor. What is the change in gravitational po (zzx-2hdj1x4c (qcdltential 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. Theseh((*ssuy(wh lg27r plane is 4.0 m long and rises 2.0 m. If the plane is *(gluhewyh ss2r(7s( frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto sm963t no9phd a spring, causes the spring to stretch 2.0 cm. What is the 9hdmop36t n 9sspring 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 constand 9mksp b4t-d;(vr53 mc-o heet of 60 N/m. How much potential energy does it store, when stretchedm;sedde4m5p ovk t9-c(3br- h by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed spring with a n+bu7m 2k wq i h2bc,2k5cny1vy6e3rssp3k2+ msb1n7yickbr6,n2 w2h uv e5ycqring 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 spring of springf v/j*o t5 vlr(s*2zuf constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched positionv j zf/(s u**fvt5r2ol is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3d*x0sm vsp 9kr/s0 7hi.0 cm. How much work is required to compress the spring an a*x7m /s shdpsr0iv09kdditional 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 5d- 54k4gdu,w sys-fnj0-m high slope. What is the sp5 sgnwkfdj -4y-sd4 u,eed 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 the top of a hill ,d+fms b ldckky--q6 6f9w)+lpj: dvwwith an initial speed of 4.0 m/s. Neglectingw )-9kf mc kv-dly6+b lwp,d6+d:jfs q friction, 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 the bottom, ie3 mi zy61f:(;xiskkft has a speed of 9.80 m/s. Whatye(;f6:3 ikkzixm f 1s is the vertical 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. When it is 0.70 m 9 :djk p-nt)2bb uo(bg4qhf1r above the floor, its potenti)h (r9 dubbkft:bp2 jgq- n4o1al energy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blast5 q42,o,arnou6yw hkzs straight up from ground level with a kinetic energy of 40 5kooz,un q6 2 h4ywa,rJ. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with aott)imqzvoz:d07d. c c5 b5.y kinetic energy of 220 J. At the highest point in io:0z .vtbm7d55cyc od.z) tqits trajectory, 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 45k:*bhw 3 r w ge:3j1zd o4+-of)ywpxkso ,tlb5 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coastelwr bwjye-)p:+f wg,b3zot sxk1k3hod* 54:or 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 th;6c rxxzb 2)sse bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the ro;2 r6xx)cs zbsller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

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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 ofzp w;rao.2oe0 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 the next slope, which is 45 m ab;0po or2. awzeove 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 bfkltw 9ksuujs *r)3ay ;s7.5x,5ibmrall 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 y66*4i+rvtvesp q b9p vertical axis and released from rest. What wille*b +ivyt64 prq96vsp 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 uncompressed,w0 jfdaq rio6 3a)hk7 horizontal spring with orki,ah 3d7q6a0fw j)spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car tofbo n/qrj-h +q, ,5mt;f4u udj stop for a red light. What work is done by the friction force against the wheelf+no4umqdur , hjb-fj , tq5;/s?

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 foru.3xz 75;qmgctrzgh/+tu sa 7 ce between a 60.0-kg object and a horizontal surface is 50.0 N. If theuu7t3 +qxgr75. z ztsgmcha/; initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, swn tbir.9 5 iprfkjxh2;6 e73p5g ;zglevel surface. It has 24 J of kinetic energy.k e265hip;nt rr fj93g5 px.7g;zswib 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-kg mass on a level surface. )3yin ll( : y1agfmp4o The coefficient of kinetic friction between the mass and the surfacei 1): flanop(gmly43 y is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m hixvs/l54v n fb l5jv4/hb1h5d jgh slope. If the work done byh54 fv xdlv45s/ j/1b5lhbjv n 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 f3gx-5r e z1smup 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 -5s rxge13 fzmto 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 ;6-sml/ 8gva/ *cf ynbg-ab nfplane inclined at 20e above horizontal. The coefficient 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? y/bmg vn6sa 8*acgfnb/;-f-l

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 o 6co p(zdf l8yo ,amiw3ea0,t.f 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air flmezt3a idy0c,,af. o 6(po8wriction 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 ; keubw5mzk78.7mgyp +a 4wmienergy when he runs up a flight of stairs 107 ;+74iwmgkyu8 wbkaz . p5emm.0-m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant velocity o6t;muapta 8 /gek,;opr7l zu 0f 5.0 m/s. What power must be delivered to the obg/ zu,u;oetp7; 6tml80ara pkject by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by a 1.0 hp motor that runs fo/ws:h)vuhzb 9t c*kx,r 1.0 hr? (1 hp = 746 Wwsh9)zh: ku *,tbxc/ v)

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 500r) ) ax n:yvdlpcse (*vo3j3;x W while riding. How much force does her foot push with wh*rnlso :yv3d x;c(3)x )vejpa en 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#

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A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average poweriwkw/l)d- ,m + to1z diszk64a del6 dt1om,-z w4al+ikw sdk)/izivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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