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

1#

What is the correct unit of work exp*np*+s5,y rxvt5rm *u w wv*w;tqf. zsressed 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.2l1etfp p5k4p huz;2t 6 tfb 0ao:opt 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 sb,fs8w fvw)6t4ak: g x:.n vqktationary brick wall, the amount of work you6k: vgbaqf,4:tw).wnkx fv s8 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 lif2 iz5kyecjz8x) n67u lted 2.0 m vertically and is being held there. How much work is being done i)72 nxy kcuzjzl86ie5n holding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally i:tzt;nm9sd yv562o6-n)thtk(4tfzmb px: gforward at a constant velocity carrying a 10-N object, the amount of work you do is94 d6ti:(g:62t )zt5smnhomyp nt zk-;fvxt b

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 returned to its orb dl4gfd px7+hlvefo 9p( :ll1qs*k88iginal position. If the total weight is 30qx:ff llp1*+dke8dpg 4s 7l8v hbo9l( N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on thesr5 1gvq:of3ln lsh2z2 ds3 c90djq- j 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. tb; -jruj5j3e Compare the sign of the work done by gravity while the ball goes up with the sign of the work donet ;re-jb5 jju3 by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) graph, represetj1wlus9iz 1fa 3 g,0iyz) ur2nts3igfj1 yi wsruu2z1z09la, t)

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 represxq+j et9;/,cc0h u.j2 pbjvdf /k.g svents the work done by the forcek ,c20x v.sp+c.hdufq g9jvbe/j t;/j 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 obje3+j-o gjtp2 pmct'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 donet9qo:k t.spltz.4am6 on an object is negative, then 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 is3z vb*ucx))zq :prkz ra;qfru0m f4(w: sye;. zero, 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 moving at twice the speedo0 ,281fy3c 6g qi eokcgkk+rz of the car. Which statement is true i36,0c+k 12r ykfcqez 8gkoogabout the truck'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 car K. They ex/soi4w z4dv)(nf/ kinetic energy of car J, compared to car K oez swy4n(v/xd4/if) 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 with1ta ni,)gssm5gy: c jzau*21czd9mj ) half of its original speed. What is the r :mas,z 1cc9i1*sym)jzda t gjn)gu25atio 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 spee83d*q ty yy+a8w2coqrd of 3 m/s and a pebble is moving at a speed of 5 m/s. If both oocq y*8y+328w tdrayqbjects 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/arbqr n(zmw9q0wy,( f,ji 9p+s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. n ,r( rfy9z +m0apqwwqb(9, ij 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 (hquo3 ks,5v7n h (hhkpanic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, h h(,5u3k(vhn7 h qksounder 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 okjn l9)r2mf4:grbu5s rbit. Neglecting any friction effects, what happen9)ln4sf:gk 2m ubrrj5s 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 zi6w hz*u+6 quzbj88i,zox0qprinciple.

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 hare:9+u q ify8xve 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 object w 5jfxa-j1(uhmmvl3u-1 t q(r jith four timeslmj-hjm1tj15 fr( xau-3qu (v the mass of the first if released from the same height. The potential energy of the second object compared to the first is

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the end of a spring causes44ub6ifhep8 w4xs6 -qf/ ku zy it to stretch 5.0 cm. If ab6x/w8p 4 4h fkfqs-ui z6euy4nother 0.200-kg mass 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 energy of deukf-p.xr 8ws.9gdq+ x +u a+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. Compapry7xr91:h,a- /kqqmz7iq2b( dwzl tre its kinetic energy K, to its potential energy U.ir ,- z7xa z/92brm qq(kwplyq:hd7t1

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 (3)ts)qt tcd xof a car driving up a hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very hea969 n0puth7nt dapv q(p ,.ky q2v(rlbvy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which risy9pbu( nk h0pldt7p,q(va6nv qr .t92es 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 nb1p.ljp0,an f8sto +dao1 b6$m_{1}$ 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 l*0w+u hzwtd74 ml nw3forces.h0l4 w7l+ zumw3wt*dn

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 vzp/yv* hg)8ubuilding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of thuv * hy/8pz)gve 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 enelg-8)gv2eoidzh:g ov j;0i6 e rgy. Do not ignore air resistance. How much gravitational potential energy did the ball losegvzg: l v)e;2dhij 0e-gioo68?

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 tquy 7pu/e1;ki- h8v*nxe *3 /k pup 8bvlqf+venergy. Do not ignore air resistny*pvp1 q*i3q;7 tu+/ pxklbue 8hk/u vfv8e -ance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conserva1.yawu k u50 9tzu( bh7wla5cwtion 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 is c)fuvjl2p:h*

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed in Srh24 xib t5 vzz2qjb)+ww5fz,5cw ak8I 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 power..k mksaoe3iwn23m e+?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-third the time. To * hpvcsq.:u 8h/*d e: qyn2djudo so, your power output mch.yj 28sudheq vpq::*ud/ n* ust 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 conmp e4n;r.me m77obj8p*cw0y astant 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 2.3y .8rvoc g.we0 m and held there. If the object weighs 90 N, how much work was done in lifti3v. rewcg8y .ong 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 d3 is/0txb+ vyi; aq7ddistance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weig/7 3b+i sv q0dyxadti;ht of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a di fzksd(:uz5 6 ,eok)w cgnb-f2stance of 50.0 nf6,o wg-ezu(z :2 5bfdsc)kkm. What 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 a:c 41l y:cvhclbw pp; cn,u)x6 distance of 50: 4cxp:c)pcycl;w1, h 6ubnlv.0 m. What is the 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 up2vjr neo ne l:ym6 ,4j.iyqz18ward with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the elee q6vl1.8myjnrzoniy4 j,e :2vator?

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 alonrv+w +8ze;y x e1i,3b kl*mymxg 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 l id7s5yq(2 9dcqw/gt 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 (assume no frizga6( hzoi5 tpva.3 c,ction), with a force of 60 azaicz,og6vh3 p5 .(t.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 de pzl5a22wy c4irection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object molwa522yc pze 4ves 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 Figohz vtu( r35ebk; 5s j+s/vdrrjj7,w). 6-1 shows the force versus the object's position. Find the work done when the object moves frowr 7r/; k+h)jeo 5d(jz,u 3tsj v5rsvbm 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 go 980ucf,/tyfraxh t /raph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 89,r yhtxf0 cau/ot/ f4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of theta(n:xrt -f7d,y . t vsmqwmk1:7ruf+ force. The graph in Fig. 6-1 shows the for d ,m ttru: afy+17ntxq-:v7 rskw(.mfce versus 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 iu*5zjvb(qv h dsh8*y;vc26vds applied to move a 55-kg cart (initially at rest) ahb *dv; vcyhqv z(s852vju6*dcross a 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:lf d6bj0b,--ddji wg (initially at rest) across a 10 m level surface. What is the final s6f,bjd d jw0id:l-b- gpeed 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 aybg7uy6 mn/q/6w cot;nk :m.l speed of 5.0 m/s. How much work is required to stop n 7:;ygn//m uboktyq 6ml6c.w 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 initiall-,kb(xjjlztfeg dn 4ik4 3(f.y moving at 25 m/s, what distance is required to stop a ca-43ndfk b(l ixg ezj.jtf4k,(r 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 cock q3fn-t,az0nvb4x+ns j - bd-bed by exerting a force of 20 N over a distance of 5.0 cm. With sbd3-,-4t+qa nvnjfx0 -n zb bwhat 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 vertical )ot iupqh4xie2kjtry f 76hn-v: /+9 xcomponent of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontallxhtii/hn7y k4t r): qf-o2v9 j+x pu6ey 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 ofmieoq(qtts.90xn3 :b i)tkkk m;b 6p+ hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acti t)bt :bkm( .sk3 +p0qxiqin;t ekm9o6ng 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 ti dt9wub,/7odhv nf1 *o a height of 13.0 m aboveutbv/* i7f,9 1nhwdod the floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an inclined plane. The pogfw ps :c e-r7n3fl+9lane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was don+ 3s-n9pw7ce l or:gffe 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 sp4aecvqqj5o q5)8x+,ao7 ynue ring to stretch 2.0 cm. What is tanv54e xaouo8j5c q+q,7 ) yqehe spring constant?

A. $4.9 \times 10^{3} \; N/m$

B. $5.0 \times 10^{3} \; N/m$

C. 20 N/m

D. 2.0 N/m

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring constant of 60 N/m. How much potentiam ojie *c421bml energy does it store, whenb*e cj41immo2 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 initially uncompress0 a;/wdkp,gc hw/6wi;t yq+ pjne.f.ied spring with a spring constant of 2p / 60h.yngai+;kj p wqct;,ie dfww/.5 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/mi5 j:ss sh*.ei from x = 0.20 m to 0.25 m? (Assume the unste :jhs5s*s.ii retched 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 of 15 N/m is initially compressed by 3.0 cm. d(b q5zptrhx(55y i*if:eoa, How much work is required to compress the spring an additionzxi5ti d ,(pyr:b5*haf(q oe 5al 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 plqt(i0m.nxnu4e7t , 50-m high slope. What is the speed of the skier on reaching the boti7nm ptl ,(xen.0q4 uttom of the slope? (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 anvl(zhz d t0;zle0 yu6)tj5a 1g initial speed of 4.0 m/s. Neglecting friction, how fast willlz51a6 te0;gtvz0d( zyjh ) ul 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.pk/;vk/ p xyw/ At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the plane?/kwkp/x/v ;yp

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; ) 8oi btfnc9z1it1oe 0.70 m above the floor, its potential energy exactly equals its kinetic enei1;oi ft8tznb9o)e c1rgy. 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 k 5kr)rjs )0v yjzfj**4q*vxhkgl d*e0inetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what verticalr0* )qlyj450ez grv*vxdsj)hf*kj *k 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 witv+pang )7xfk(h e0mv2h a kinetic energy of 220 J. At the highest point in its trajec7p( fg+0axn v )mkv2ehtory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above 24xhrsy i+7bzthe 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 slop zs2h+rix b74ye, 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 aahp8 .+m p leu8jcm8pa1 b/f3at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will1c3ub el+ 8p 8pma/jhf .ampa8 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 pna/rvs0 j:cw( u9 nzp;oint 30 m above the bottom 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 the nextc jz9;wvnnsu/:ra(p0 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 tl p+l.- yxw8cuhe 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 0.18 m away from the vertica.xquw h+ co d4.t6jh80rlarg:l axis and released from rest. u+6wc qtr.0orah jdgx:.h48 lWhat will be its speed at the bottom of its swing?

A. 0.243 m/s

B. 0.649 m/s

C. 0.973 m/s

D. 0.811 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 initg38o;oc z1 :evfpee u0ially uncompressed horizontal spring with spring constanto1;pgefz3:e0v 8ue oc of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A. $0.17 \; m$

B. $0.34 \; m$

C. $0.51 \; m$

D. $0.68 \; m$

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red lilq/fweb uzf4 .m +zk g53(jp6yght. What work is done by the friction force against the(6 u f5wy 3qfe4p bjz/.kzgl+m 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 a :vjwle4cruuh-uv x :zn 22s:0nd a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/slu: :0vc:xw 2unhurv2 -eszj4 , what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24 J of kin 7fnoix7il3lzs+p+e 6 etic energy. The friction force on it is a consnf sz++iixlle 77p6o3 tant 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. Th-8hm:v*n c-u bi9qe rgpck83ue 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 kinerpvh: i*b8-8gc 9cn-3qm ueuktic 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 llkzlo4 q)c5u dsia2:6/ mye) a 50-m high slope. If the work done5symqo):z 4eau/ki) d6ll2cl 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 plane. The plane is 4.0 m long and rises 5r(zau(8ll6 tpqc2)6hgx w zc2.0 m. 5 gl(w(t6z2ru)qh zl 6p 8axcc It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of r-a8ljj/djt k2j42wca 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 pla 8-/jajjrwjc2l2dtk4 ne?

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 he*8jdyxdbtfy +a/xajj :17,ugight of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average fo1 g/jfx jy,8 yaa:tu* 7djd+bxrce of air friction acts on it as it falls?

A. $22.5 \; N$

B. $75.0 \; N$

C. $225 \; N$

D. $293 \; N$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight of srs* k00lorh/kpk-t q; tairs 10.0ko0rp0klsqh- rt/k; * -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 mo z7)q44bgkld 3 h1vgwxtoo:d/ ve an object with a constant velocity of 5.0 m/s. What power must be delivbo)gd4 dkv34 /gqo:1tz7h w lxered to 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 by a 1.0 .rfka ly,lc 0e99he5 rhp motor that runs for 1.0 hr? (1 hp = 746 l9e5ac 0h9f,yre.lkr W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How mupkut-qp) ;z6(xr lwb/ ch force does her foopur- w;p(bl6 )txkz q/t push with 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 power r3k, a10qu3 ae.hwi gidelivered by the engine? (1 hp = 03gi1 ,rakwhe.q3a iu746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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