Physics Unit6: Work and Energy - 无忧得胜-网上国际课程 (5edu.win)

1#

What is the correct unit of work expressed in SI8n7p ) 4sr4we, qeqpyp 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 systeft : a*r2kzgnw+mjo i.u 8l.vl(z)r i0m if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

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

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a stationary brick wall, the amountikz29,qb sdnjbt 04y8exq7 7- yy:haz of work you2szn,bih70jy7b8 ae 9xkqzyq dt 4 :y- do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m v0h4io jajhj9n*z8j;r,e 5ydm ertically and is being held there. How much work is being done in holding the box in this posij ,e5d*hjho8mjnzar 0 49iy;j tion?

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 carrying a 10-N hvpyy .y5z*bs:o1dd, object, the amount oy15hzyb:d oy,* vd.s pf 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 ver,/lm vxca :)dl0*cnm)ai8a kntically 3.0 m then returned to its original position. If the total weight is 30 N, how much waixa)c :kd cl8a)/0v n*,ml mnork 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 the bwn+*e 9+an(v eukag+object?

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

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

C. No, because the object has constant speed.

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

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by gra.oo1pvzz- uuznk oosq 6ua:iabem (:39rw/ (3vity while the ball goes up with the sign of the work done by gravity while it goes u /3:o6z zrb v za-1uepunoki(o.m(sq3:a9 wodown.

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 Fv:.p q.48bjkt4gyhelf t,r4 vl f hu65m90 nrgorce versus position (F vs. x) graph, representsltv5ylk 8 r,f v6ph4m .9 4uhre:ng0jtb fg.4q

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), w jx ahcjj/a*(gdor+;fc; ;ls 9hat represents the work done by the force (; ;lhjcoa+grc;jaf9j xd/s*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 kine/;3c*xj c pbg s(qv3gztic 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 negjyoe2 ;yz; cf u*cih,f.ind 1e/r8s 7yative, 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 ucq fnq4+glx9ml (1m7etu:w:an object is 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 vbq4stpqyn ow*t7t /: b2bper +l5f:) speed of the car. Which statement is trrqt+tq :4sbwn5b/pfv2 ob)e py7: lt*ue about 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 halnvhaz *75ttfmrb 3 )c2f the mass of car K. The kinetic energy of *5t bnhzt)vfm2c 7ra3 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 wallzk4olgct x+ *6 and bounces back with half of its original speed. What is the ratio of thg x* 6otlz+c4ke final kinetic energy to the initial kinetic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a speed o;k n j jq.so((ids*fi (wh-gn/f 5 m/s. If both objects have the same kinetic energs( gqk( /oi- hd;*wis(fj .njny, 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 speeb0f:frh.e mz.ela 2o6d 2.0 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 greate 26o0:ef.fbzhe . lmarr distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain distan8dhx t2cqqt0n,. s8 qyce on a straight, level road. If you had been traveling twice as fast, what distance would the car havqqsh8 ncdt x,.028y tqe 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 cpz q lp*o;9qw63 l/rhthe Sun in an elliptical orbit. Neglecting any friction effects, what happens to the o*cq3;9ql6 r/pp zhwl 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 ppi-iaz :hy -gpsf11g5:qm dm6rinciple.

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 negat e3gf2: dqb1o(pv jazve:e1k2 2jjgf*ive 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 objecd :r4w+2;wpem cwl rx,t with four times the mass of the wrwer;c:dm,+ p2wxl 4first 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 causes itw,l ca7:hp (yr to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of t7pw:la,(h c ryhe spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a systemmi5 d2u:a pqqv;8 )irf

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

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

C. can never be negative.

D. is constant, only if conservative forces act.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from a tree. Compare its kinetic energy K, to its po4i 6 emk63uoontential energyim u64o6 3neok 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 driv0 ) tllrub-an:ing 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 heavy object are htc-ea36j ft rksbr) i g(.24vsliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. 4jkht(.s3 rrfieb-6 tcva )2gWhich 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 6n5d90gnskv/ ay+d7hk j1jdckhg 7j1$m_{1}$ 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 energv6pj+c6bza ;li1 )-cp6u of nuy for conservative forces.f ;ub16zpcljaun o ic+p6v-)6

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 th 2ftjm4o fbk+.e top of a building, 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 2of4bjk fm.+ t(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 Jy:ny q b+)yt to+ pd2pg1vrv97 of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did thp9)q+:n byvv dpr21t 7o+ gtyye ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravitational potential enmen 91nl6m544nm no srergy. Do not n56snl m1e4o9nn4mrm ignore 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 conservation of e2fou /t(* ygcn0mvq ;jnergy.

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 isi yz*.tnm,a05 hr/8 n3cvtya c

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 tua3c m1u xe653i)t ( m,3quw bqfp6haof 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, whicrg ctfn l+;c)(h is not a unit of power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did 3 times the work in one- 1/ ect85jq8a)iobn64tvofw jthird the time. To do so, your i tn8ov5ta/wf jcoj4b 1qe)86power 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 acceleration, the car's hd vrom/v5v9 yp108/f/rdm8rw tc;a kengine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If the object weigh9v yghp)s 21oqgfzy 3;s 90 N, how mu9sg)phvgy z2y1fq;3 o ch work 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 airtwlpfrl,3*k pbnll :*t+5k 8a a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by tt lwkl8 3kr+5lnp,fa:*p lb*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 cft7u+uh.n -x pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the woru tu-7.ncxh+fk 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 distanc9i+)d: s)fe-mtsjdxx(i 1z0j a x/ r xff;fkt;e of 50.0 m. What is the work done by thet ier):ka(sfj+ji;)x fd-dtf1 s;0m9xx zfx/ weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant-aim+k 23gs uu/,r)rewdcwro /3 w3qt force of 5500 N for a distance of 5ai/co)w 3wgq2emrr3k-/dtus , +uw 3r 0.0 m. What is the net work done on the elevator?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m r ,qz)v)i kgo6 z6crk:up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

A. $-11 \; J$

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

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

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

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m down a ramp, inclined atfa65ye ,esrrwroz u3n 4- /h.z $30^{\circ}$ 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 sisphi;-a/; cf.1l*t4b zhy brhoter Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle of4chb1l.h*;h;-/p iay rfbotz $37^{\circ}$ 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 direction6h :3qgtusy; e of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done whenu:geh s qt6y;3 the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the directi/5exz1v qfi2-z 5tlqmon of the force. The graph in Fig. 6-1 shows the force verqzv t25m/ lqi1f z-ex5sus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fj bkr;+crl+z9 ig. 6-1 shows the force versus thej+zrc 9r ;+blk object's position. Find the work done when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph i81*zzhw ohta(n Fig. 6-1 shows the fozhw tah( o8*z1rce 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 is applied to move a 55-kg cart (initi(0fmyp :ulcr4ally at rest) acrossuly(0:fr 4pm c 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 550p )/vtq5 ajj :yskz:y-kg cart (initially at rest) across a 10 m level surface. What is the fink jjv/zaqy ts5y 0:):pal 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 requiredgtgnf;b g+tfy 3of 99* to stop ;ytn g b9o+ffg3g9*f tthe 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 initiallywlm/,)by7dk v hoqueb8 +fa;9 moving at 25 m/s, what distance is required to sto 9wlavmbeu, q;o+7ykh8b)/d f p a car 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- +v-xk)q mqk(pg 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 the gun, v+ mqpxq()kk- 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 component of 60 11yn s 0lewpt3polt4(imp m)v;ilv) :N. The force is applied to a box which rests on a level frictionlee1 ()w40;p lvy:olp1i)imlmts p nvt3ss 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 bale of hay, strikb8qaj 4ybg+ 7tb(n3hhmv 5po)ing the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before s847nbm b+5ht3)baph y qvjg(otopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from *8qtaq(kxi,m c1 fmjcx;25 ko3:idb u a height of 7.00 m above a floor to a height of 13.0 m above th 8o2iad mtx1cj* bikck:f ;(qm3,5ux qe 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 lo /pyyd:x-7go rrv7b6 gng and rises 2.0 m. If the plane is ybp yr g/ 67oxr7gd-:vfrictionless, 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 springiw;i q jx7u cy3.ue)(b+glw +4ufnyo) to stretch 2.0 cm. What is the spring consta)uiqwu x.u 4oe 3n+jgyy(; cbi lf+7)wnt?

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 4v44u67kcjd. vxbw l)t;zrjr,w1 un5fy ucw4 by a spring constant of 60 N/m. How much potential energy does it store, when stretched by 1d fuw; vc 6l nju4,44)k7t.jczy1vb5 uwx4rrw .0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initially uncompressed spring with 8uzz7ueimg- , d91.e pzwtny6a spring constant of 25 N/m8dezium7z6g tz.1 e 9w-py,nu 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 w0g.ivic*syg0y.l :b of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is at x =:ys* w0.cvy lg igi.0b 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. p4 d1gy9q)l cb Howd q4ycb)9gpl1 much work is required 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-mn9c 0cp idw. fok,l9zoon(:k+ high slope. What is the speed of the skier on reaching the bottom pz0k.+o9(ko:w,cfcd 9inl no 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 hil0jb5.a j wigt2l with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dr. 5j a2i0gjbtwopping 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. yh 337 jaq-dpoAt the bottom, it has a speed of 9.80 m/s. What is the vyad37o3q- hpjertical 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 the floor, it +0 krq5ag ja8mj,fzj:(zxp:h s potentia5(z :pajj+ j,r8f:hxq 0kma zgl energy exactly equals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, bmls/ ui -f7egdnf;7.ev9me3 olasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total ml7;m fv ge3ofdimn./s7e -9u eechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the ground with a kinetic enenf)yla3g)po o q+;c d.rgy of 220 J. At the highest point in its trajectory, its kinetic eneyag f cn.q3d)o+)op l;rgy 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 bottom of agyvm5hm-uu0/ dip (See Fig. 6-2). Neglectgu-y hm/um5v0 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 point 45 m above the bo) ljmwy( j0cf u;-dit6ttom 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 m above tyj ; 6l)(u 0wjdtifm-che 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 point 30 m above the bottoo3xb/ ft8re+z m 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 thzor btx8/e f3+e 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 speedbs31 przy8i- u of the ball at the bottom of its swing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm 9ii;j61t a ecue 25savis pulled 0.18 m away from the vertical axis and released from rest. What will be its speed at the bottom iiv6ec2 ;st5e1 jaau 9of 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 initially uncompressed horizonti3mrs.l* r /dmal spring with spring constant of r/*m.dlsr 3m i$2.0 \times 10^6 \; N/m$. 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 kt,ful;05 fx7bh pa n*a red light. What work is done by the friction force against the whxkn5 tlp7ahb* fu,; f0eels?

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 and a horizontal surface is f ij b43xmgpj 3w*(5yf50.0 N. If the initial speed j3(p ff* xg4wj5y3bim of the object is 25.0 m/s, what distance will it slide before coming to a stop?

A. $15.0 \; m$

B. $30.0 \; m$

C. $375 \; m$

D. $750 \; m$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, level surface. It has 24* h/u ulttxy)zt. akdvgq 6*93 J of kinetic energy. The friction force on it is a constant 0.50 N. How .a * duhty/)kzt6 uqx3gtl9v* 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 appli9ciw vl 4she6(olrw+3 ed horizontally to a 2.0-kg mass 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 changeirws(lc+6 93 4vho lwe 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 mhblv v0r2b1v.-cbnpe7 n 86 yhigh slope. If the work done by .bv2160bcnhv yml87rnpe v-bfriction 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 s rf d6m6 -xc,b/erg6eko zm:-long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. r- d6ezr,f /s egmbx:6-ocm k6What 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 r mu0*fw.3yt0v dw0kgiest at the top of a plane inclined at 20e above horizontal. The coeffici3ydgmvt0fi w 0k.0*uw ent 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 from a h6(t9n)h+ kroe y gic1height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force o 9eyhr)hn+gkoic 6(1tf 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 f(2 ( .b 88zbzobjlpkwnlight of stairs 10.0- p.(nl8z8wbj2bz(kbo m high, in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a cb6 e k8bus)-cvxw,an: onstant velocity of 5.0 m/s. What power must be delivered to the object 8:-suw)vncbx kba6 e,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 zw4l 2q5a0e u dngs ,nuy/)d5xhp motor that runs for 1.0 hr? (1 hp = e la ,4)ns5gd2x5/dqwun0 zuy746 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 rate2 guaf,ri fx47+qq(ma of 500 W while riding. How much force does her foot push with when she is traveling at (igfu qr,qa m+a47f x28.0 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. Whauzqxvl o--e22 t is the average power delivered 2-o2qu- elxzv by the engine? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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