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

1#

What is the correct unit of work expressed in SI units y;broi*.q:7hnrb;w t?

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 t0 trr hw 5y/tn7qg3:qnhere 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 bri0mr.irm2zs1zm .ak *qwva/wm ev9vt/ ri ;o8:ck wall, the amount of work yout mv.qi9.* os/m zar/k:0v;2zrermvmww1ia8 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 ver3 ,w,nhudhq yh zt(szc1 9ow)2tically and is being held there. How much work is being do1z(c)oz2q,wd ,ywh9sh3nt uh ne 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 hoy wcw3d-+p8q vrizontally forward at a constant velocity carrying a 10-N object, the amount of work you dwcwpdq 3- +yv8o 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; nj .egux*ae4vd g4(e returned to its original position. If the total weight is 30 N, how much work44(djvege augn *e;.x 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 thm* +1ei;r3ywbf*u hhne object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by graoqn5 w(dsk 5+ cm*axz7vity while the ball goes up with the sign of the work done by grav 5szax*wm5 +oqk7n (cdity 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, rdsfrs-b8 )gv) epresentsrgfd)) 8ssb- v

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 aoze2;zfhf vj; vg/,:position (F vs. x), what represents the work done by the for,eh/v:v2fgf o a;zjz;ce 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 * um9hu(8lxhlkinetic 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'0/p gqmp/0i lzd)56xt9eu npp s kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then the object's kinetic 0fk4vtfu3kk fjs3:m-2tl e -aenergy

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 .krfz4 i9 fko.l(d+7sm m ,ypcas a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy ckild.r,zp mm ys9k4ff7+c ( o.ompared 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 az, h+byf2je 6ms car K, and car J has half the mass of car K. The kinetic energy of car J, com+yjh 2 f,zmb6epared 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 bt0 e--rdu c2:q vvgu2wack with half of its original speed. What is the2: tu0qw2educ v-vr-g ratio 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 pebble is moving at a speed of 5 m/;.v25kq7 iyfejf u, 1ukoqb0ks. If both objects have the same kinetic energy, what is the ratio of the brick's m ,o; kj ubvqikqk 1e05fyuf.27ass 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.)ca4)dkquvd: c(7s ne 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 greatec cs 4 )qe(7d:nu)akvdr distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certahnrk:4 ;st)bbgm iw (: kalh ij.h0u+7in distance on a straighrbk b;gh +ii7)hs0tn :jklah.u: 4mw (t, 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 elli+tx.uesq hhrw79x471q+vtf cptical orbit. Neglecting any friction effects, what happens to the planet's kinetic en4t 7q tx+x+h71wrcqf9.svh ueergy?

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 princibe mq *4xj rhvkrljo(u (o69rg )+-qxt1 mty7+ple.

该题自我估分: (必填) (满分:1.0分)

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity $\frac{1}{2} \; kx^2$ is

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a system to have negative potential en5qn)z cxe m o5x3ryf31mjg, )wergy?

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 object w* o e;thra+15ymv/ao r;zjv* kith four times the mass of the first if released from the saayv/1zt omjrv+;kro*h *5a;e me height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes it to stretchxn 3kn p f3pz7muw0a.. 5.0 cm. If another 0.200-kg mas.pf3ap3nmu.7w z k0xns is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical enek*b3: t/ccw xlrgy of 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 ennmo0m +50v v rul4hty3ergy K, to its potential energy U.nvyh5mu034 vr m+lt0 o

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 azzk u4ndm,/p0ti8r u cf5o+t- 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 an 1(kfv4zl(xy zd a very heavy object are sliding with equal speeds along a level f1 (kyv xz(z4lfrictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses fft5;exqje 6r c-cj07 $m_{1}$ 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 energytm hne/j0*n2k)87+jfh uf hix for conservative forces. ij0t j2hhn )km8xef+h *u7fn/

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, througho.v t)w2pkr )o the air (air friction is present), to the ground below. How does the kinetic energy (K) justtp)woo .)2rvk 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 an8r2r tc 1shtk)26cyssd gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energtc12r)s8rkc 6 2stshyy 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 potential energy. Doixgv) mh*p dm t1uy. wd9j/0q/ not ignore air resistance. How much kinetic energy did the ball gj)1tivdmu/q9 . xwy0 g/pm*d hain?

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 conservationcj27rixs vlm*ng 92xr0 p*du9 of energy.

该题自我估分: (必填) (满分:1.0分)

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t isc0t-0 qjd, .u :ql7xgpbdox0n

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 +j(do 2 rvexup zja60m ve6z2,4/lwtlexpressed 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 ngl0t a+.7;gzen.t hm3yno 5f yot 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 the work iirs+/ jcxcndi -nxs7uc:-a8r 99(fxmsqx 0z- n one-third the time. To do so, your power output 8s +xfzcr(j 9mn-xn:-dc0i-uqis9rax 7sxc/ must have been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's engine*eiv1 o3wod+*e7ghoh 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 h 1ee)j- e-(4sg z(0y9bkucgaluunp0peld there. If the object weighs 90 N, how much work wa4 y)p-(0s9 nlu(j uc0ee1u kgze-gabps 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 bh4he gq2 +tl :pbibr1/;fc-dvook up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by-hbpc di :4qr;2b+ht1fl/vg e 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 with0b z1 5/yl(ujrgu(bp+g8r zp c a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 p u (5(jzzp0+ub g8ry/brgc1l 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 yz *bhdf4p 46tN for a distance of 50.0 m. What is z 6phf4bdt* y4the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constantre 9sp; bs8ra5 i--z f pst*w+7el)avr force of 5500 N for a distance of 50.0 m. Wheas)p+ptaze--;w 8 *sr5f r97ibl vr sat is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up a,5rqtovd i2ygg r6i(v,k7st2 o3ivm5long 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 at,e;nnm46p r 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 -;to5e8 efmo 9x 5fmzasled on an icy surface (assume no friction), with a8e- zo 9amfm tx5f;o5e 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 direpg,wu-1wayz/- w3ug rction of the force. The graph in Fig. 6-1 shows the force versus the objecrgawyuzwgw,p13 /u - -t's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig i2im:-c8w frj. 6-1 shows the force versus the object's position. Find the f8 m2:cw-iji rwork 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 forcebln5 +;y;f zbt. The graph in Fig. 6-1 shows the force versus the object's position. +; tbfln ;yz5bFind 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 directvv,js.z(x;r:g bu ( crg8 st.vion of the force. The graph in Fig. 6-1 shows the force versuss. vbgz;(r (g: tju rv,8cs.xv the object'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 move :hwl6b (wei0b a 55-kg cart (initially at rest) across a 10 m level surface. What is the final k wwh6b: (leib0inetic 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 ap n5d;-psh )r-tsteu hp7:b :seplied to move a 55-kg cart (initially at rest) across a 10 s bs tpe): ndrp-57 ;ust:eh-hm level surface. What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. Ho 6:nu* 3 xmks-g r(ay2y1fdvka4jq9 wvw much work is required to stop the a4 1-jk9rxwyymq kdn2sauv3(v :6*f gmass?

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 movingonv);(dvf o *bo, z1v1shh6f2b re/bz at 25 m/s, what distance is required to stop a car moving at bo/o1voh*)s2f hrnv6z ;bd,z (1bfe v50 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 by e 8tap39 s(yvcpaj9c(k xerting a force of 20 N ovaac pk 3pcj 9v(8(tys9er a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical8.:ex vt-t yvd component of 60 N. The force is applied to a box which rests on a level frictionless f-y8t dx:v e.vtloor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A. $200 \; J$

B. $160 \; J$

C. $120 \; J$

D. zero

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally into a bale of hay, strikin/ur l(/uncqa7 g the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stop n(u7/c/l qruaping. 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 7.3q+2:e1mcq6mvicq3q++dfq f v9 oey b00 m above a floor to a height of 13.0 m above the floor. What is the change in cm q+qc: b3fq 3dy9em+qvq6o+ef 2i1vgravitational 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 pushe-d ngh9w8cg29-ok cukx*n m p3d up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictik g-2do89nu pkx mgh-n*9cwc3onless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to sswso;6rp c41 ycyhsw*2f w6i+c(u ru+tretch 2.0 cm. What is the spring cons 6s;wh(w4ys2cr*fpc1 suo+ r 6uy+iw ctant?

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. h7ov7v qousqt8w 20+m How much potential energy do7+s w 2vthqqo0vo7um8es it store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an iniypgrqx7u r4bw1 sk; jg8l 638ptially uncompressed spring with a spring constant of 25 N/m by 10 cm.8;u3brpqxwps 1 lkjyr74 6 g8g

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/2 zztul e;rc,++vm,tim from x = 0.20 m to 0.25 m? (Assume the unstretched position er, ,v+tz+m2zlc iu;tis 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,hz(a:h06u x bbl 5g2:chi kjd 6vpq1o is initially compressed by 3.0 cm. How much work is required to compress zqv ah1gxb: oipjk6chuh56b: 0(,dl 2the 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 the top of a 50-m high slope. What gt0l q ksk)7pf0.vbv-is the speed of the skier on reaching the bottom of the sltgsf 0p07)qvkv- b.lk ope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an i 8xy- xfs m0mol1+/jhho7 e0crnitial speed of 4.0 m/s. Neglecting friction, how fast wi c fj10- x/ymrlx+o08eh7hmo sll 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, it has a sm26m+dq iok b:duk857 kgep6ipeed of 9.80 m/s. What is the vertical height of the8e:67iod5k+k 6 qp g umkbd2im 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 imi5 n.:ql +imjs 0.70 m above the floor, its potential ener5qm. il+i mj:ngy 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, blasts straight up from ground level with a kinetbs4 g(j hii3f2ic energy of 40 J. At the exact top of ji bgs3(fi4h2 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 a kinetic enerz1pkni7 xl7u5:x3i wu gy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it lu3wnxp57x 7: izki 1urise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bottom of a dip (Sg ya-d+z(vp n(ee Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the nexan(v y+p-(dgzt 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 theukcev/:7b:. /y pct ze bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next sle c7pebtzy::/ uc.vk/ope, 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 wt1n7a x86qo*)mmi l-q+cbmsat a point 30 m above the bottom of a dip with a speed oib)namq *6c+l7 1mm8txso-q wf 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed ofqapcdfahi 7gp+qc9 0 4jdt89 gpxs7+- 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 2-kg pendulum of length 50 cm is pulled 0.22 m away lb (jf*,u5g xtfrom the vertical axis and released from rest. What wilxfb lu tj,(g*5l be its speed at the bottom of its swing?

A. 0.30 m/s

B. 0.80 m/s

C. 1.20 m/s

D. 1.00 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 25zjz.nmwkvh9 , *2j k(t m/s hits an initially uncompressed horizontal spring with springh*k.tnwjzm k9 2 j,vz( 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 n mw)jn506. fa7 v rc69wln9l .ntbplwm/s, slows down her 2000 kg car to stop for a red light. What work is done by t9wvnrw) 7lf. wb n9 mct l6anpnj65.0lhe 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 betweei7j.zsqz(j ,4d tvcl9yo2es1 n a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to 4ic2z, dtoqj(ys 7 .jsv9 1zela 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 24 J of kinetic g8s,ato a: 4)cwvf5 twj+ q1dwngm.o4 ener:w)jac d8vwqm145w,. ogt+ 4n oafg tsgy. 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. -*nph :i+ h)o2lvm iet The coefficient of kinetic friction behlv)tio2-eh *i pnm+: tween 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 energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slopg db59v9(zpoy 6aomg6 e. If the work dy bpv(6 965aogdzg mo9one by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plah+p xq;i0 +jr3myt(d7 jvps3hne. The plane is 4.0 m long and rises 2.0 mt j07 ;p3d hrxsimyv(hjp+3q+. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top o dq2 y, edey q7:njsmhk, ;ut9a2sgl0/f a plane 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 pl9dyaj m 2hs,/edl 7e:;u0qyt2q,n sg kane?

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 droppds0*djed/nmslk*la 0vs8 chs3 gz/. (ed from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it a*e8hddz.3ls( smlj */0gscn vak/ 0sds it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a w+j7j7 +qlc: xbi wij5flight of stairs 10.0-m hj w5:jjic+ +lx7 w7ibqigh, 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 veloc( j -w wwmj::cpe:bhz3ity of 5.0 m/s. What power must be delivered to the e:jzhmp3 w-:wb(j w :cobject 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 thal ae1n km(o6(qk by+p-;q c czq8)wap*t runs for 1.0 hr? (1 hp = 68q*-znwbq)p1cm (cqp(kaoly+ke a;746 W)

A. $3.6 \times 10^{3} \; J$

B. $2.7 \times 10^{6} \; J$

C. $4.5 \times 10^{4} \; J$

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W whild 2d zscw6l;9om, .-t0)bdtsdqn2rbie riding. How much force does her foot push 0dd9mb;.qnsw- 6dz,co it)2rb2ltsdwith when 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. What is the average powegz53 ro7jiux9 r dezrgo75u39 xijlivered by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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