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

1#

What is the correct sh gx-/ ;+hl*xtmf 0cxqum5r h6y2.vvunit of work expressed in SI units?

A. $kg m/s^2$

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

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

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

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a system if there is no motion?15 p- riya4k4rvgyr0i

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 amount of workpe+s kj izgkvy j i3-io;;q)() you(epi;yvkq ;+ogi-))izjks 3j 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 vertically and is being held there. How much +nu *kxk46lyma9/eqt/m n ,hn wora4y kx m ultm,/6n/eq+*nhkn9 k 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 adg ezu41 u v5fu5szut)q,q2 3k constant velocity carrying a 10-N object, the amount of work you do i z3 gfk,esu1 5)qqdz2 45uuuvts

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 itsdmayqa. y;aa3x3d45 j original position. If the total weight is 30 N, 5; .ad4a y3xdjaa 3qmyhow much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do t0:id nl 5x1r.,nzvjfpm2u4o(x t+1 qh h 2xxcwork 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 up. Compare the sign of the work done by gr9vg zb)*1g volavity while the ball goes up with thzl1 vb9gvg)* oe 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 versus5mwgvu2.sg 9 e xo.q0i position (F vs. x) graph, represents.qe2 guv m90o.5wgsx i

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 v 44da yaqxqcp( ali7*+)jp nt-ersus position (F vs. x), what represents the work done by the for -*ja)d+l qt4 4ypcix7aapnq( ce F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

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

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positivequ. 9ja4zib8h0p ,kjuo3j ,vh, 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 negative, then the ob-z* r/8eig lldnnpg+ark) 1+hject'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, the.wz 9- w f,*cnf zkhzc:x2z.qdn 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 2n5 *f31 7lfrbxga e cv(g ylfsy4:uw6at twice the speed of the car. Which statement is true about the truck's kinetic energnc(ef5g xgfw6 ulf 3y 1alv7y2:r s4b*y 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 ckfu +gia4( +nt*5uj.l n1i *xhuxj:t: d;rakgar K, and car J has half the mass of car K. The kinetic energy of car J, ckhn:ul51i(n+g j :uka a;u4gt rx t+x*i d*jf.ompared 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. Wvh 5cj/ , ndty+19os;c stg(rfhat is the rati gd,tnt( rsos 9ccj +5f/vyh;1o of the final kinetic energy to the initial kinetic energy?

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

B. 1/4

C. 2

D. 4

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a x6ed9/5ya l p1tx j*gshba;.o speed of 5 m/s. If both o*9j/;.bxs 1ha6e 5gtxyop dlabjects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is m78u wqu/ ,f :4st2morocgw;deoving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travel4w;:2o/7ufder o8wm u,scgt qs the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain distanc,/w)r-owtt nuzb7n7 n e on a straight, level road. If you had been traveling twice as fast, what distance wn- 7o/bt7zuwrw,)t nn ould 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(nwl/s w85c4k6 9zuddwb1iwi any friction effects, what happens to the pla 4 ic1d/ud nws 65ww9bklw(i8znet'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 principlerazp6iuh-6 (+a0xqd j.

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 pot87h+y a6 :z6lblmydm 4wavfk1ential 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 groun04wt54canq xvuu+5a yd. A second object with four times the mass of the first if released from the same height. The potenti4 y cn 5t5uvx4ua0+waqal 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 spi0 b)v3g7jrlhb*e*n2 4-vqw tq9fhn a ring causes it to stretch 5.0 cm. If anothw)i2g lb rnfhqv79j vbe0 q3tn **ha4-er 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energsko +* px2d7ro4 b/fe0q au 5sd80csdty 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. Cww/ c.p4ln.o compare its kinetic energy K, to its potential energy .c 4o/pncwl. wU.

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 a hbvpqp1ggsu 46 jd: 0hjm o7q--ill.

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 equ 82bryxmouv(4 nt,b j6al speeds along a level frij 4utbo2bry8 6x,(nvmctionless surface. They both slide up the same frictionless hill. Which rises to a greater height?

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

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses yehw +*0j,z+aw( faur 3kys-f $m_{1}$ 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 mechasqk/2xc81b4y)0w8b syzyvds gc . vv2nical energy for conservative forcesw2d/sy v vs kg. 88sq4byz)v02bcxyc1.

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 buia6j)5qb0jym u ey-qer99 1 ssclding, through the air (air friction is present), to the ground below. How does the kinetic esaeymj5 uscb -yq0 9j16rq)9energy (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 distakkc68ey7h/ wx74uafance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitax/y 7ucha48 ewk6f 7kational potential energy did the ball lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of grug/9q2 b d.r or9z5poxavitational potential energy. Do not ignore air resistance. How much kinetic energy did thexr/ob u9p 5qgoz d92r. 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 e9k ,qgkmi6j p79b f ud8p+x7qsfq+8glnergy.

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 isuk8.8 aih di0g

A. the kinetic energy of the object.

B. the potential energy of the object.

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

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

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct unit of power expressed t c*9 wx(m:vriin 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 of powd/yg fihx:7jih(j ar9 q)c8-ver?

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, yousox/0g /h0.y rf f8evp did 3 times the work in one-third the time. To do so,yvshf00g/e 8 .xfrpo/ your power 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 n xjao3yp(utf1 l6ru)lan +5 0car'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 an9l ex 4 zt1a-p2ieymc;d held there. If the object weighs 90 N, how much work was done in lif ymx-2c4ezl9taep;i1 ting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, a ko2bk5d* xez-r9rie09.vu *qki0bju t a constant velocity of 0.50 m/s. What is the work do k5*ue 0do9kr.2ibq9r j- b vzixeuk0*ne by 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 N for a di,bcqn xxe4l+4stance of 50.0 m. What is the work donx , b4+e4cnlqxe 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 hs +,x- bmtoc(a constant force of 5500 N for a distance of 50.0 m. xb t-(o, c+hmsWhat is the work done by the weight of the elevator?

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

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

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

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

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a const(r slvchj-s-7 ant force of 5500 N for a distance of 50.0 m. What is the net work done on the elevatcs (rs7lh-j -vor?

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

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

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

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

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m up a*d9i 7( qujfsiv, hg+plong 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 fruith:i8f/t-ss/ted0f+qr 1 azga slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A. $157 \; J$

B. $-157 \; J + 78.4 \; J$

C. $78.4 \; J$

D. $-78.4 \; J$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah ib6ll )hyysnh0i cs i),ey2h 0/n a sled on an icy surface (assume no friction), with a force of 60.iyiy,) shcll) 0ehsn6yb2h/ 00 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 fp6+n/1lnodk q yvc om+nr twqw, 2j7:;orce. The graph in Fig. 6-1 shows the forcqn:to7cqw/y+,wd6po;1kj vnr2 m l+n e versus the object's position. Find the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A. $20 \; J$

B. $40 \; J$

C. $60 \; J$

D. $80 \; J$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the forcefyzces ;:i 6fc4gd 7,z9xfp-j2s +bxe. The graph in Fig. 6-1 shows thezb4y+i9f:j fg6 ;,ce 2 d-xxfcsszpe7 force versus 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 objeo)p,z y+ ujo+ks1g6,ttx 2yr jct in the direction of the force. The graph in Fig. 6-1 showsoyrx ot6+yz1g pt,2,k )+ jjus the force versus the 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 8(fpf b:hab-j direction of the force. The graph in Fig. 6-1 shows the force versus the object's 8 afbf:j b(hp-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 d-l;9 fuoe-qw)bk)yato move a 55-kg cart (initially at rest) across a 10 m level surface. What if9bq )-ya- eu;kl)dows the final kinetic energy of the cart?

A. $1.0 \times 10^{3} \; J$

B. $2.0 \times 10^{3} \; J$

C. $2.7 \times 10^{3} \; J$

D. $4.0 \times 10^{3} \; J$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55-kg cart (initially at resu5fz ytvsn 8gt dfx*6 aylb1y;/5)w a7t) across a 10 m level surface. What is the finav6)zlf/ygxbwnd uy 1a5 8syt5at 7*;fl 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 isugdi.*85gwrk nd 2(n s required to stop tg8dd (k n*5g w.in2urshe 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 initially moving at 25 m/s, whdo)keo d/,;vm.ae8 tjat distance is required to stop aetm,;odjk8 dv/e.)a o 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-g dart. It is cocked by exertingiv6qug6kuap ox9so v ;37 68hg a force of 20 N over a distance of 5.0 cm. With what speed will theq6 7gv8uax6k 3o hui ;9gos6vp dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a vertical component o ,yl/ijj v1i/cf 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and c,ivlj/y / ij1moves 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, striking1+duwnqfo1 ;8zqx* ku the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before st*kuq1fq8ox;nw+d u 1 zopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m a;d a vtxg;k7l0bove a floor to a height of 13.0 m above the floor. What is the change ind; tg0a 7lk;xv 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 planb(, p mrvf:z*je is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was dbz(mfjr:, v p*one 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. Watop;z cs10 8)aj0vebhat is the spring 1toc0pb0 szj)a;v ea 8constant?

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 potent sq mdh4: chi5kp p.v)4z24cqiial energy does it store, when stretched by 1.0 c dz c)p5 :ihqk. p4simhv24q4cm?

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 wjex b*3dlkcx,+5 rz5iith a spring cons b5d3 rl,kxec x5+j*iztant 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 spring constant 40 N/(bdc*g:x5so i m from x = 0.20 m to 0.b s5g*:i docx(25 m? (Assume the unstretched position is at x = 0.)

A. $0.45 \; J$

B. $0.80 \; J$

C. $1.3 \; J$

D. $0.050 \; J$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially compressed by 3.0 fh itlcka,,w;+g ),yy cm. How much work is required to compress the spring an additional wky ;,i+l,f gh)cya t,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 resdc9mixxy mn32dn :)w6t from the top of a 50-m high slope. What is the speed of the slier onyn3mdd ):m2 6icxn9xw reaching the bottom of the slope? (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 kg, pushes off the top of a hill withy sqghz03);p( nxcv -q an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving afx(-3;0v gh zqsy)cpnqter dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionless incl0xukn y(v6)c w8ak l0iined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the pla) (wla8n u ykixckv600ne?

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 above2fvamn+q3 ds6 the floor, its potential energy exactly equfq+ad 2n6v3 smals its kinetic energy. How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts stra gtqk8 1db(a3afd-mbr8wt / t7ight up from ground level with a kinetic energy of 40 J. At the exact top of its trajecr d87aa(/8bttd gm3- bqf k1wttory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves ;0. dflxt;4y+ mbfzj nthe ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kz;n b fyx4 t.+0dfm;jlinetic 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 startsntyu+r 8b+ vj0 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 m above th8y+v bun0r+j te 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 e0u4 1nocz /f)wx0ncithe bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the i0u40fonz1 ecx /)cwnroller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with a speed3 u)/z burduqu;th2gw ke5v0r/; lvo/ of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above th/t /rq5;or3; z0/vw hled)kuubv 2uu ge 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 bottom of.9 bcj s93q.lsq c6i:srl8m u qxv*7uduzs3z2 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 xquo(h;,dcd vy; xs(1 cm away from the vertical axis and released from rest. What will be its speed at the bottom o;hyq(1vu,o(x ;x dsd cf 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 b dxudp:ec ez0eiwd+,w q5y4 )5li74q25 m/s hits an initially uncompressed horizontal spring with s,b d: cu4w)+iz0lqxw d45dp7qe y eie5pring 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+tzo/rgro0 r )yp ui+2 her 2000 kg car to stop for a red light. What work is done by the friction force agaiz+o2i r/ur0+r gop )ytnst 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 60.0-kg object and a horizontal surf-saztrwwkz69,d.5r j(w0 tzmace is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide beforewt9 j, (tms5a0 6z-k. rzrwzwd 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 cqg do8 2t1g,bgn98sgf* 0uplrough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will 8,g* 2lfgb8qngos td1g 9cu0pit slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mass on a hfst.5al gdm:f:b* rpl ss,dwt 7-.i0level 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, fdss.fttw0 dlmr:b-g7h 5pil sa:,. * 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 w(qkng5w) u.w qork done byuqgq5n wk)( .w 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 a v:im- /oj:hlxn inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box vhj/:loi x:m- 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 inclin1 2a) zpp bix 5ir+vr6evqc,w,ed at 20e above horizontal. The coefficient of kinetic friction between the mass v p1,vqrea2 rzpi6ci,+ w)b5 xand 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 height of 10.0 m, and strikes the grouri aos482n oa3mj+ykvnp( e6/nd with a velocity8/24(vo6a+n o n3mpisajre ky 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 fl(6j1nueyauflkc:* 4c ight of stairs 10.0-m high, :ccfe*61 k(lu anuyj4in
8.00 s?

A. $75.0 \; W$

B. $735 \; W$

C. $4.80 \; kW$

D. $48 \; W$

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to move an object with a constant veh nqhe:m j/ic33p9i/a locity of 5.0 m/s. What power must be delivered to the object by /e3:j 3i mhh ipn/ca9qthe 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? (q1er7osue b3 ;gjm+t( )gumi8 1 hp = ue8 (m1 r+7obsjq;)gtg3 imue 746 W)

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

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

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

D. $4.8 \; J$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rate of 500 W while ridi4s9 l v0p47hz zjd(btb1jd*qs r-wr x5ng. How much force does her foot push with when she is tr 4zlw4-vjt(xr h z 905ssqjpr7bddb1*aveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average powerozxewbpy88qhb/p( *0p wr.x1 delivered by the engine? (1 hp =p x1./8ey*pww(pb 0q x8hborz 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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