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

1#

What is the correct unit of work expressed in SIy*q4xstb 7d82j q6u m/ttey-c 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 at(3p*ic zr-k do*xmo 0 system if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a tld q6gzz/g0.stationary brick wall, the amount of work you dzg.l6tqz/ d 0go

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 hel1 mjz674 tw4x/tzp2aq,bvdjrd there. How much work a mt6bxr/pjjw z,qtd4174v2z 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 constanti0p gr,vnz-)o velocity carrying a 10-N object, ig o) -zv0p,rnthe 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 -(syl9, xq l9v hndot1m then returned to its original position. If the total weight is 30 N, how much won9qtd l s9xol(,h1y-v rk 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 for sulq 8jn+/hgrmtw :p1q9e/3 lce acting on an object do work on the object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straigb7aop7p kwnqy e) 6v* v686bsiht up. Compare the sign of the work done by gravity while the ball goes up with the sign of the i6b nv v) a*bq7e7wyos86p kp6work 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 (F vs. x) graph, reprwuzk8h;q*crh)n o7q6 bz7d4m tj-/mpesentshtqprmwkq4) z/b 768 duh*cojnz;m-7

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 vs1reb.a crx 0qgfkb3 43. x), what represents the work done by the force F?k1.gb0qf4eabxc r3 r3

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 ontp d09:omhk uc gf41 jbbt+d x52ghx(, an object is positive, then the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negats0w7 rfzjh87 oive, 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 is zero, thent 1xk(hjadj(gy ;wy7)ct:t3t 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,/ivftvvni9*x4 sq lq15 *j3 os and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that oj* 9q4 vin vof51*lxivsstq/ 3f 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. The khc* bq+b8(l0zkd .+d agdf qu0inetic energy of car J,db*dg(+ uh+qq f8a0dz lbc 0k. 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 with half of its original speed. Whatukl- /(ul6kow+ziuk 9 is the ral6zi ukuw/k+k oul(9- tio 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 pebbletdvj0kwqu,0v; br9i 2 is moving at a speed of 5 m/s. If both objects have the same kinetic energybk0jr; ivvu9tw ,2dq0 , 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 2xy40 ,i( cqbnamtni 91.0 m/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. Which object travels the greater distance before st ian4 nqtm,01byc9i x(opping?

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 certai/ad/tt/ 8opi hjak) h0n distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the saakjthpo //ahtd)8 /0ime 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 ellinym )(6b9,5ik.jjyezat*rf dptical orbit. Neglecting any friction effects, what happens to the planet's kinetic ene9e,j(ab5md. i*zfktnj yyr6)rgy?

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 gvktead3;.ekmu18 : gda*(ur principle.

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 potenti yqtuthx0, /7ual 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 frox.t*5 hwy;n+jc nn6a2 hlak.zm rest a height h above the ground. A second object with four times the mass of the first if released from the same height. The poten2 jn+hw5t..nnkl*y ;zx6ah catial 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 stretch 5.0 cfqv;c+(:p5 rwd liy s.m. If another 0.200-kg mass is added to the spring, the potential energy of the fs:c 5q;yw +.lrpvd(i 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 mechanical8 obq5 ep5mag2 energy 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 energyhx7 a;hxj7nv wo 4wcf;o l**2wp2y6oz K, to its potential energyn4phhxl2yf;a ow* zv6ox7*;oc 7wwj2 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 driving up atjs;ymiez.9+ y( o:xn hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object and a very heavy object are sliding with equal spebar-d e 0pp 8zm4mxhybq6 z762eds along a level frictionless surfac7r2 z q-z84p6 bdyb6p hmae0xme. 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 :6(qukhy o2 r(rk mz*nj e0x0o$m_{1}$ 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 mechanic iz()w .)awqsqal energy for conservative forces i.zws)aw (qq).

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 buildin3i0 i9mmfc3 mtg, through the air (air friction is present), to the ground below. How does the kitm c mf3i903imnetic 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 antfdmo07skv4mdxj* v-zdz.5. d gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy d* vzd z.4df. m5vomtd-k7j0s xid 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 :rru:l;8;t vo qor xy230 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did :rt:vq28;roo; xyr luthe 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 conservatioygnr* 58a j gvjfa+9v(n 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 isa 2qqc850gqkd ox(;kf

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 uxu0v hak5 u7m7nit 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 n 2my;vb(wgxi ves l e-x60r)5aot 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/toeva:r ip)fll9h 77 3 times the work in one-third the time. To do so, your p7 p fl)7l9:/iet rvhaoower output 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 accelby; ty3 ; u))qpck54kznq3nf 00rpqbkeration, the car's engine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If r 3eh: w/q84vo ula:7sn+iny ithe object weighs 90 N, how much work was done in liftin8vy4no: 3a e wirunhslq /+i:7g 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 physicbs+ qy0qc h*yc ((m,jks book 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 qk(y(c *mhs yb0qc+,jthe 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 pullei0km6wv0fd5ch;qr p 2 hw5o e6d upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done b0 60oidfwh 5 r6emcq5k hv;2pwy 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 di/ep.(vzdnuz r8 xv6g8stance of 50.0 m. What is the8rz6e. zd pvuxv( ng8/ 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.wu sfj xoahl9hf ;7v3 0g+-rx constant force of 5500 N for a distance of 50.0 m. What is the net work done on .jo7hls f9x0 gfwv a3h;-rx+uthe 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 k xima(ky8yz-(m6/ ; ro3dtkmalong 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, i5qmt5w t (t,8dic5vssnclined 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 surfaceq. ewv ct/g-yzeu m fu9;a.f2/ (assume no friction), with a force of 60.0 N at an an/ tuvz9q; efec g2wmy-. f/a.ugle 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 graph 48ieppmx(0 e sin Fig. 6-1 shows the force versus the object's position. Find the work done when thep(mp e04x8eis 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 grahvl+t+b6xi 1g qk aq36ph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 toil+gb6+q 3 6a1hxkqvt 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6-1 s s9ld9sz uoc1:hows the force versus the object's position. Find the worsl: o99s z1ucdk 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 direction of the force. The graph in(o :r+lmzhe 63yoglf6 Fig. 6-1 shows the force versus the object's position. Find the w36lhze(om+ 6ofr: y glork 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 ch)z u2n v(mjjnc bfa ;zck6j/j:6*r3 to move a 55-kg cart (initially at rest) across a 10 m level surfzan*k):6 bjun2v czjm( 3c6r;c/j jfhace. 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 caumcb3u,n0rc 89dudpc0i q d9wh0ri 6: rt (initially at rest) across a 10 m level surface. Wha0:ciu w0rd9u9 idhc,n08 u cqb3rp6dmt 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. How much work is requir zi.cgos;npiho/m9x5i a0dg t5 c-c2+ed to stop the massh0mo cn 29; /z-i.+ paggc5cxi5ds oit?

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 nzhv65sol8ue + *hc b7; j;opdstop a car initially moving at 25 m/s, what distance is required to stop a car moving at 5unjbd5pl6;e*+;8vohhs 7oc z 0 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 ejrnyy) 82i ge0xerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has neenyy )ij0 2r8ggligible 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 compo*a:l 9chzfxgx) yv0h+nent of 80 N and a vertical component of 60 N. The force is applied to a box which rests onxh 0)v:*9xchz laf+g y a level frictionless floor. 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 bal06p0*zgza;y+)vgx pejmewrf i12 j5he of 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 acting on the arrowp0zje2 i *xwma6r zegfv;1 gjh0)5y+p ?

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 i3 :e 7jv1sloo.bg d5yto a height of 13.bejsg v:l7y1oo5i3 .d0 m above 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 plane is 4.0 m long and risesi(b9c c o*mtwgf8ho3,tv jg9e2-gy7i 2.0 m. If thgh9 b2 w 9-vt8cog je(7co*3ifygm ,ite plane is frictionless, how much work was done by the push?

A. $1600 \; J$

B. $800 \; J$

C. $400 \; J$

D. $100 \; J$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. Wq4khx+my)yd qk7 a hl7/p1u, vhat is the spring consta q1,myv7xluhq+ k k)7p ahyd4/nt?

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 potential uq)+ba yooyzx ;-5t,z energy does it store, when stretchuqz 5o-;, byay)oxt+zed 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 uuy2 mhl ct k5t3,u rxs.r+92sinitially uncompressed spring with a spring constant of 25utuk2cm ry 9l,.xst3u+hs 5r2 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 bc/*t;hjp7al 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretche/p jt7;bahlc* d 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 comp s1dd on:fwwt/lgh 8.)ressed by 3.0 cm. How much work is re8 t h/ lf:1swddg).nwoquired to 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 hif07cs lcwt e5dp(l/, 60eo mee :4lmuqgh slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect friction.0stc4mdeewu/ m7:qp 0c5( ,e ollfl 6e)

A. 22 m/s

B. 31 m/s

C. 9.8 m/s

D. 41 m/s

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pushes off the top of a hill with an initial sp5xxh6c2+a9f g0 znwwheed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 1x +wcn562a wf9h0hgx z0 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 in7k74id5:i ybxteh+j 10a f .g/ueea jtclined plane. At the bottom, it has a speed o7 +fagjj4.xiba 01 e/dhuki57 teyet:f 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 m above t a,se;jm( rv*mhe floor, its potential energy exactly equals its kinetic energy. How fast is it movimjr m s*v,e(a;ng?

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 kinetic/+ d,8 0.k0 5getvyf flskqans energy of 40 J. At the exact top of its trajectory, itsft,q0s 0 .y5fs gk+n8l/ed avk 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 l*:.-mw ogahl ndbq su410xx8 seaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic enhxqu .l1 sd4n*:w- sma80bxgoergy 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 the bottomo)a,oygob *l7 of a dip (See Fig. 6-2). Negle)l oo7 oygba*,ct friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the 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 pointbpy 6t p/x8mx1 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what wilp 1mty/b6 xpx8l 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 az75zc mnsb cg/b.r+*q point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will 5m*qcg zb.cn/b srz+ 7be 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 of the ball at the bott9nzlueya8 -p +om 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,va 7loqf5w* s 50 cm is pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of its swingwsa 7ov, l*5qf?

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 hitsle.7o0+)p jng8knvxjpmbj30 2hb0k l an initially uncompressed horizontal spring with spring clp . n7jj ng0k32evbopxkj)b0h8 l m0+onstant 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 hermq7zu n3l8-47p k1p c+x zdwtm 2000 kg car to stop for a red light. What work is done by the t4 l1zu8 -z 3wqnx+km7mp7dcpfriction 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 f ) yuv22 nfymepxwm-,:orce between 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 sly2:mypmux-f ,)2nv e wide 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 opn+d mg,g1lq /pup, i-rq.*nv f kinetic energy. The friction force on it is a constant 0.50 N. How far will i nrp , g*.di -lnm,q1qupvgp/+t 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 my s2+z6wm0g sxrzj5( on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in 5 wjx6mz2sg0z (y+mrsits 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 gd unzj,b68.rq0ye 6u slope. If the work ded, .u6q gz8jbuy 6rn0one by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. T yr*8)w enzmt1he plane is 4.0 m long and rises 2.0 m. It requires twrnz 1 )8e*ym3200 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 a plane inclined at 20e a8h7yeb 0czx)ji( mz *rbove horizontalj iy(c bx*)r8emhzz70. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

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 f3h.2fx v b7mboq:ad,u rom a height of 10.0 m, and strikes the ground with a velofmvx3o2hb.daq, :7ub city of 7.00 m/s. What average force 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 flbxf9g- rv *(stairs 10.0-m hil(f* 9rbv f-gxgh, 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 needed3kl/7 rqe2v x*13h9cdjdtufnv lf(-a to move an object with a constant velocity of 5.0 m/s. What power must be deli9/3hj avfl1vn rlde utc7(- *3fk qdx2vered 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 hp motor that r 6b/m0m mdi*x*5jftw f*j*cukuns for 1.0 hr? (1 hp = 7bm u/*dj**ifx6cmjt k 5m*0fw46 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 much 1mfu(zr t+. j) mrmh5lforce does her foot push with when she is trajmm)r1l.h5z(+r tm ufveling 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 avccy:/-tc1hlcm i.k +wvn z+6ferage power delivered by the engine? (1 hp = 746 c.lmn 1c6/vit:-+fcw +khycz W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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