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

1#

What is the correct unit of work expressed in SI unitmj5g7/a 3s (b-dxd/ qsn(qzb xs?

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 no0 qbr-wa-pzmv- g-sv6 png(/pt, ,aoi 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 har crxfrcoph wo68s 273.d against a stationary brick wall, the amount of work you f 7.wh8o32 r 6pscxrocdo

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 c fcb8h4me:a 9uz0a/kheld there. How much wor8a f4e/h za:bmk9cu0ck is being done in holding the box in this position?

A. more than 100 J

B. 100 J

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

D. 0 J

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant velocity li ue+u.j.j3w carrying a 10-N object,u.jlw.ejui + 3 the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

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

D. zero.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted vertically 3.0 m then returned to kk 1+0z dsgdyx7y-+ll its original position. If the total weight is 30 N, how much work was dzd 1sy7 -yd x0l+kkgl+one?

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 6+ n+kh2ub,h+fq2 budezih 7k1 1 n2or9eoodxwork 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 upgl86z e6 mdsgu ql7;8c. Compare the sign of the work done by gravity while the ball goes ugz8 g8le7ul;66s cdqm p with the sign of the work done by gravity while it goes down.

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (Ff 2p :3duo;bd8v9t fqm vs. x) graph, represents9vtq;f:8ubof2 mpd 3d

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 vs3ui+uvfe */g rpf stu.q-jf 7osd f46;mo,5z s. x), what represents the work done by t,up;u3gzv f s/76.f*+ 4ijft-fqsm 5esduro ohe force F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then the object's kineticj-xfig q3eh356 ,0efuznjw/y 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 obje 3 s)a6ivh5* rnra;srqct'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 zer7v i5uy.mrju/lp+v-lwh:*+/jv tys eo, 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 at4a*cu u..zpr h twice the speed of the car. Which statement is true about the truck's kinetic energy comparedr.pch*uu.a 4 z 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 5zxa:zt b9f-zq/zu c7o;v g(vas car K, and car J has half the mass of car K. The kinetic enerzogtv5aq c;v(z u zxz:-97 b/fgy of car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces back 3a,6cour8 n*wh,szru with half of its original speed. What is the ratio of the final kinetic energy to therhanu3s6,*r8c wz, o u 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 k,koo6(f7h k,zhz m+u m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, w6 (h7+zk zkhokfo, u,mhat 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.di tul: j8bl*djwv+a-u ,uc8m+f i8g70-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stop* t -cu ia8dvjwlm 7,ui8ud8l:+fb+jgping?

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 cer5qgevjx. b 8w-tain distance on a straight, level road. If you had been traveling twice as fast,q b.wve8g -jx5 what distance would the car have skidded, under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits the Sun in an elliptical orbit. Neglecting anyq2iwh ji zg993 friction effects, what happens to thi zi93jwg hq92e planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy principle.tw/ n,3 ek6pco

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 s .n pubav7*hwzn;r32py6 1g uwystem to have negative potential energy?

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

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

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

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

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h ab)r5i4 h hljcp7ove the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to the fipcrj)75i hlh4rst 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 stretch 5.0 cm,ekpy+ bwtry:+go 0xx 7 u yd.ph/i--v. If another 0.200-kg mass is added to the spring, the potential energy of the spring willh+otu+-pb w:/gy7k i0xvp-yx. ,dr ye 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 en ua+iv vti1q+)ergy 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 kin7 zzgame(03imn24vn qetic energy K, to its potential energy7mn 4e3q2v(iga zn0mz U.

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 driv0a5a7mh ,r omring 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 heavx 6hhn8h 1w0.,de3bl(svw hsby object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greatd(nhsewb l0vs. xhh 6w3,b8h1er 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 p;.5u;xeci j48gd64he/7ais h rqzqz$m_{1}$ 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 conservati ws)xj)tv:xz4 on of mechanical energy for conservative forces4twz ):j )svxx.

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 c -s33e fvyy7sbuilding, through the air (air friction is present), to the ground below. How does t3fev7 3-sysc yhe kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kinetic energy. mot*1eagxf 8wl qc.6, 7ql(nr Do not ignore air resistance. How much gravitational potential energy did *(1twrlf .,7qomc6 lg 8nqx eathe 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 pox qskfq0b*q z a3d*6i-tential energy. Do not ignor k-qb*dq 0fz3q6ai*xs e air resistance. How much kinetic energy did the ball gain?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conu2*g s7spuyut5e byyh5 7f-g +servation 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 d55jyilkat /q8f84y p

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 6 d-96mseug)vlf9.l+qtz u0h) nbw afunit of power expressed in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit ofkhx ntc ,zrg))eo3+ *k power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one-l;mz iz2191yhhg fjx -d0nm. wthird the time. To do so, your power output must have ; mh zg0mxzy jiwf-dl29 .1n1hbeen

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 c bzc t6:sz asibx6:nyi+)i+5 gar'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 l. 30dxdqh wndfx. ffv3*u0:rhl 1p-ym and held there. If the object weighs 90 N, how much wdrx-h y.1d 3 wvn*.u0:ffxd l f3p0hlqork was done in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air ,s)6ljs)mcl d33hw 8 nhmjgth-;grp(a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done b), njhjmmt3w-3l;8h)6 s cdpglhsg(ry 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 5500 sn m5j4 zz- 1ynmg;,,5iooo rpsl;ws/N for a distance ofs gzm;r4o5,o5isjzp/m nlo1 ;,nwy -s 50.0 m. 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 upwaryf894o 6 onplzd with a constant force of 5500 N for a distance of 50.0 m. What is the work done b8 yzf6o 9npl4oy 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 upwakcqiq.lvnso a *91x4. rd with a constant force of 5500 N for a distance of 50.0 m. What is the net work done on o9q.1k lx*. vai4 sqcnthe 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 alonp;lq n/ c tfb76xt*/wb,2u dgpg a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

B. $-1.1 \times 10^{2} \; J$

C. $-1.4 \times 10^{2} \; J$

D. $-1.8 \times 10^{2} \; J$

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp, 3 g8wkiw72l x*l3k/kn*4 lqlydx lu.kinclined 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 littl bplw3 ekpbdeweb8 k3b.6+;pb+ a0m-ce sister Sarah in a sled on an icy surface (assume no friction), with a fopd- kclb3 8wbbw 0 be;e bp3pa6.ke+m+rce of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The ac8 (cbwxraxqxp/.f(q g 8r-d;c w5k4graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 2.0 bw c gcwp-5 .xkxrxa/qq8d;fr4ac(8(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 t juouxbcx0u3) 3rlsjzh**q pm p56 f-(he direction of the force. The graph in Fig. 6-1 shows the force versus the obu xu0s-*jqbz5)j cho6um (33p rf px*lject'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 dir ux+ j.v* ggpys21ukyz56py3zection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves frv yz+x 2pyz*35u ksgu.j 6g1ypom 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 i 4rj 45:cqrmkon the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work dq:m5ko4r4rc j one 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 a 55-kg cart (initially at rh/3myi8 us1x o5 qbw* 4dsofs/est) across sdsx qb//4uy8i*owh3 mfs1 5oa 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 52:g )bywdi n ;-sdpu 2o6qnxzmove a 55-kg cart (initially at rest) across a 10 m level surfax26g2upo dw ;nq)d-5 :nzbys ice. 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. rqbia/3r+ phugg* c-0 w(wib0How much work is required to stop/ iic- 0hu+pw0agr(*bbgwq3r 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 initic-k4 78fa 4m+f1 tx 2q2myhdl7(z1 gswvkgbjfally moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the sag42 1fazdt78jck7sbh4xfgv 1+q w-( mmflk2yme 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 1cnj)-e r8g*qokv5 p+i0-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave +8*q5-gkn)e prj iovcthe 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 componen,7nxi kbz d5m;lyob07b c;z(f t of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and cy,(;7 z5fzxokb7 mnbb;d il0 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 ispmk.pb*e (6a0g-lgnsnu()x l3 e dik; shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm befo03gk6ae.s l(dn-xlu)g i k(;b enp *pmre 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 mot0t2gobqwx 5s v8 z. (hpn-w:bved from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is thht( :w0tn5gzvo-. pbswqx 8 2be 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.s1y1jg-ggh q-r oct6, The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done sr ggtgch1oy6 --j,q1by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. (oz4tlh ew*f2f 5+xdwWhat is the spring constxh5(fe*4 2lw+f zd wotant?

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 mucqsh sa68gl7k k4-5 iaoh potential energy does it store, when s -q645o skgik8 hals7atretched 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 requioyem.gu1 vdlc3vh (7+red to compress an initially uncompressed spring with a spr.7v1el3u(vcymgh + od ing 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 spril mw*)ijb-k k9ng constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the j-) k kwl9m*biunstretched 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 cbk+lsmvj(fx iy4(vxo ajwc 7g h, (;ku7f2z*0ompressed by 3.0 cm. How much work is required tovckh;yjo(l*ugibs+(xmk7, f z w2j( f0 va7x4 compress the 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 inea8 bh /oc ua too/a.ywm:*n,f(: tu+60eggfs the speed of the slier on reaching the bottom of the slope? n:fu:ut0of(+w n, oga t /hg */eb68ecyomaa .(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 kgnxt 0/8skbzbj, x4ll u.n0c 3j, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in en,/l. c xl43x0knjz0b8tbsu jlevation?

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 ;zow qp7 uxou2z sxm30,s 2*gminclined plane. At the bottom, it has a speed of ,7zouuo*swgxs xmp2qzm03; 2 9.80 m/s. What 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 chrs72dae08ne1 m.j um above the floor, its potential energy exactly equals its kinetic energy. How fast is ihsr emd8 a.euc07j 2n1t 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 leveyer9l4 *d (cvgl with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To v4rgc9( l*dye 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 leavesh76cc qqgt u7u; pj3(m the ground with a kinetic energy of 220 J. At the highest point t6g;uq 3cph7c(7m q juin its 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 sta/nldhuav(g 5 3( y,x5 ghgcpw:rts from rest at a point 45 m above the 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 slope, which is 30 3ax dp w5vh(l uh/cg5y(g:gn,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 d boxz3ltu9lw hn3 q)jx :;/0fspeed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what jb:9hdo3 ;lnw3fxtzl)0xq/ uwill be the speed of the roller 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 of a dip wit5if*.2vy4zdedpsy6 fl; 0)hv otre:kh a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the 2e fs:4vy0r6.y); 5pd v ek*hlt ozidfroller 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 of the ball ath5 .p75hsl hay 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 awayb*ts lgwf*9nv2tke ,w v;uu). from the vertical axis and released from rest. What wi ngb2.;)u*, ewuw*lfskv9tvt ll 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 initiallywxr b6z8 iw.y.veoa5jt (8 9hf uncompressed horizontal spring with spring56o8(9a.vwz.fixb8w y eh jrt 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 to ra.a9m x0viw5stop for a red light. 5wi9x.0 vam ra What work is done by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60qt2(6wh,crv 4datqyt - d8h4n(gputq:c1tt+.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object i,1d q4 :+-6cgnt8att4htwq 2pq cuvd(h(t trys 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface 5; g)mya,4tnoe kioe(. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slide oi)te5k(yego;am4n ,?

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 appliej-;/0q) m xpxulw i4eb8 mapcnlb3btgu r3 ;13d horizontally to a 2.0-kg mass on a level surface. The c3rbn t;3ab1 4plgu0/-xc 3jw lpe);q xb8u immoefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic 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 slope. If the work wk. ox1j e3wq0 jubxd6.1 )47azigkvadone by frictioxjewvxkoa.7.6kwgb43jdq )i10 a1 zun is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and rises , e7)o1cstjhk);ksqe2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the q7kjo;h,s))1ces k te average friction force on the box?

A. $0 \; N$

B. non-zero, but less than 400 N

C. $400 \; N$

D. greater than 400 N

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclin(t p4y.q,umv8s9h buev8 gnhfa :x((j5yokh8ed 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 slidi 9uq(yakbtf58o ,.gp(h(mh:x8 sy4u8nj hv veng 4.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m4cse.)bex, d hw 65xps, and strikes the ground with a velocity of 7.00 m/s. What average force of 5s d p)sbx,x6c4eh w.eair 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 flig1tqzaw- 1(gr :-u3vbhw :kkfu ht of stairs 10.0-m highrfk:q (z:bt-k13wuhg 1 u-vaw, 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 s5r vob(-z nn9:;rj/ e0q1f us .zntmbobject with a constant velocity of 5.0 m/s. What power must be delivered to the object by9:-frz e( sn5 q;ornmbj1 /st. z0uvbn 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 for 1.0 hr?m r;z+n*tpibk4 o2*hn (1 hp = 746 Wtpi*;nz rkhbn*+om42 )

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while riding. How much fhzq 2:dv+*7 sqi0dj gptm9z9kk8c1fv orce does her foot push wi zd q : j9cgtvmik2zp*k+87q01fsdvh9th 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. Wtw /dv zl:/ q0a,v7flqhat is the average power delivered by the engine? ( v0t7 ald,/ qqz:/fwlv1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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