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

1#

What is the correct uurjohvp -wl2z0o270lz( 1z xmnit 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 i v)xfo +8ko **zligc(fs 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 bric yqbt*0 knd48.-zaos;wwhq7 dk wall, the amount of work you 7 q8;nksay db4dzto0-hw q.*wdo

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 verticpigjqm 00t.5 hally and is being held there. How much work is being donetqgjm5i0h 0p. 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 horizontal/.b n6h j,grbzauky+ i3:nv4c ly forward at a constant velocity carrying a 10-N object, the amount of work you 3/u:cvnzk arj6 gihb4., yb+ndo 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 s:u y 5lfc-00l vumd-yis lifted vertically 3.0 m then returned to its original po d-0cflmly5u yus0-:v sition. If the total weight is 30 N, how much work was done?

A. $45 \; J$

B. $90 \; J$

C. $180 \; J$

D. No work was done.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force acting on an object do work on t,rp7vqvzp , x1he 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 osf t78qb 2,blef the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes t b,ls827beqf 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 vs7fsjgc0)jk:wcha0+ g . x) graph, representscsfc )70gj a0+j:khgw

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 p*pz xmlww5,3 2i xcw3q4kesm xs*8( gfosition (F vs. x), what represents the work done by the force F2w ,335qxw*mz*i(8p wfec4 g sksxlxm?

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 objecgy* s 0, qcs8pw1-fkhct'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 negatpv j9qej4aijp-kh5vn 3+5 zn,ive, 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, then the object's kinetikw vp,4ht 1n--g e/gmrc 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 ab , kefzrh7f67a9wpuvg+) s f*s a car, and is moving at twice the speed of the car. Which statement is true about the trucks fweffr,b6pa)vk*7h gz9u +7 '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*5 rcar4a ovb0, and car J has half the mass of car K. The kinetic energy of car J, compare*rb 0 vao54acrd 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 bacr,d9g)b0 kzv:4 ja ,zb3ortnfk with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic egt:r )z,k zbjba0,fd3rn94vonergy?

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 tgd8h, 25z y95ulyeo(v;pwpj speed of 5 m/s. If both objectlh2 5o;wte58y j 9zpd(uygv, ps 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 movp96s.45 jsc0.gb tbfx8ao dk ping with speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking forcg8.6 oc54ktp9ax bj. pfbsds0e, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, and skid a certain dist ek0xkq7*6 x9z 85yyx4rr:b tenmsr c;ance on a straight, level road. If you had been traveling twice as fast, what distance would the4r 957z ryky t;6cb0rn*xqese: xxk8m 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 ell;krfpo80 g,dntp.m5z :qwbomn7-j,liptical orbit. Neglecting any friction effects, what o7ppk f-0moq, bm.5 :grwn8ndzj;, lthappens to the planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

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

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22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energyax ka4o,0 b1dg3ju -mb 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,i)s n +vij13lkpvma+ 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 2c,v gtujdh;/ct3oik ic9w9nfrz9 c+g51n4s above the ground. A second object with four times the mass of the first if released from the same heig9s k cho rtu+c ,9fc dg/v2tj1n;wzi9nc4i5g3 ht. 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 j. 4 eo8i;,zpluy,wexit to stretch 5.0 cm. If another 0.200-kg mass is added to the spy jepx,.4el;wi8 ,u zoring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy of a syst h,r9c3drq0vt em

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 potential ene2 /5w vlfqjh0zr 8;qhjkh8qp-r8lpj 50 fhw hz;vjqh2qk-q8r/gy 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 a hill*gst- 6ffjl)w.

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 with8ky6 ivcn8br0;e6fv o equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which ri 6 80be 8cov;iyf6rknvses 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 5bfgd e; 4ig+/u+ ndiyus4vi,$m_{1}$ 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 mechanicalr fo,kq9/h rh efev-d ,np5*;u energy for conservative forces. n u/pv- ff e;hr9ro5eq*,hkd,

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 building, through the air (aikw4 v,ufpd abg 4),y;cr friction is present), to the ground below. How does the kinetic enera) y, w b,dpk4vu4;cgfgy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 d4wtm55 gc2v ah80 jzrJ of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the b4 8 gdhtazr5520vjc wmall 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 a hyl ho s o*rvwj7f,hv,.fx*45nd loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic ene w4s7vhxjolhyo ,5v ff*,rh.*rgy 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 obb poz7wr8 vm hm.tw+ 90f6p3xf 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 isf a3ovkus+ atq0+pk(0v4qq)x

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 expresse1ia+kf8 : og 1l8dvomvd in SI units?

A. $kg m/s^2$

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of e*c5k cqwzq2doqsyj )-z( w64power?

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-7+jhq7-) * h lbqnssq 3pl;ekhthird the time. To do so, your power output must have beenlq)-henk7lhs7;3sj bp+*q qh

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 acceleratqj7b zh;j(. hq: cd4xfion, 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.f27ef/ 2n d(di+tskg: v4 swpb0 m and held there. If the object weighs 90 N, how much work was doneft:7+ 42 benis (dd/2gvpf skw in lifting it?

A. $360 \; J$

B. $180 \; J$

C. $90 \; J$

D. $0 \; J$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air abc6 ;nw0lnc jo y (tde:qq818s distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done :ysow8 ct8q njbn(l1e0;q6c dby 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 wc :a1.j2z rjzpulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5w1rz.a2j: czj500 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 pt8 c;1xhz0l ccluo2x 7qp +ks8ulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the el s8xoqxpc0 lt2;czh8lc+ u7 1kevator?

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 force of 5500 /fyv f9v)sbhpq jd4h88s to)6 N for a distance of 50.0 m. What is the net work db / h9 vfsvf))qdjs84hoy6 pt8one 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 up alone;5jz6 b+hz2inem h wd/bn7;xg 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 dobjwql grrbw07i/:1 c vuwsc85p8.py)wn 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 littlegeesy:,o p(/rn*wfxv lk4 0x9 sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 ,n*l r/o0weysxvxk4g p9(:e fN at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A. $185 \; J$

B. $433 \; J$

C. $575 \; J$

D. $720 \; J$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fig. 6-1kjc :jplb)g4( shows the force versus the object's positio )j(pl:b cg4kjn. 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 thu2ybz/b mhe; -e force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object movembzh;/-bu 2 eys 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 directvc(3o9 fnarb /p ;(xfvion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when tbv/; x(nf(v9p3 r ocfahe 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 dcw*; nlf4pjx/fg)o /q irection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 tow x 4)/cpfg*fn ;/lqjo 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 mjlm k s(6js6 vh*p .dww,;1qaqove a 55-kg cart (initially at rest) across a 10 m level surface. What 1 l6hj* w;6s, .kvp(wajmdqq sis 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)e slf)jzmj6w fex0;i681ml- z)kn fy applied to move a 55-kg cart (initially at rest) across a 10 m level surface.fe6f1fz m jl xzjise))0;-ln) 8ywm6k What is the final speed of the cart?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. dwg6c u5h)(ub*(tiz dHow much work is required to stop ti6z5) utu(wdb(*g dc hhe 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, what distance is rzvzh 7)21l4.b gw clvxequired to stop a car moving at 50 m/s under the samezvclwb7 4x 21 gvz).lh 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 dagu3mwy6 0xf6wm a7ac 5rt. It is cocked by exerting a force of 20 x gwucwamy 6a0576f3 mN over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component of 80 N and a oj.-q qjy; tr6zyn u7*vertical component of 60 N. The force is applied to a box which rests on a level frnj 7tj; y qz*.6qo-yruictionless 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 z4r0ut l czoawfn+(:6shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a declz0uzarn46wft+( :o pth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A. $45 \; N$

B. $90 \; N$

C. $180 \; N$

D. $360 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is /eh zred 2p1k)r+ev 0jmoved from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitat )rke+v1hee0d /jrz2p ional 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 pla ilnrtj/v j- wpoj..uatdji63--/w, ene. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how j i6en,rw.j-j -u.3ttilp/a wj vo/-dmuch 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. :jqyl arf8y d9n26* wpWhat is the spring co8 ql9 pnyy62jadwrf*: nstant?

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 m(g+gofxa(rm *x3k vp* uch potential energy does ik3 **(+vor(ax pggx fmt store, when stretched by 1.0 cm?

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

B. $0.30 \; J$

C. $60 \; J$

D. $600 \; J$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required t74d3 7nmf9cou/ly6uwp5(x sc -awzum o compress an initially uncompressed spring with a spring constant of 25 Nfy9/-l7spd54uc wazc6ox u7 3( mwnum/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 spckk0to4hw2r7 /kunc +ring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretche7kcowkk42h0u+ rtcn /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 cojvej vko9cz)z(ei20i, q ca .,upd*)onstant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring ank)9i jqazzoo uje2d,vi( 0p.ecc ),v* 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 o - celoo jc,h*:3*eunpa(+b fkf a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect f+*3ojch(op: eeakuf-,bn l c*riction.)

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 init)s9 x2edaiz6 7vo8qjqho w4-jial speed of 4.0 m/s. Neglecting friction, how fawdej6x)ahs q8i9v -z7ooj2q 4 st will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frictionr** ,69oybz,(csvxyqxgwmv1c dzd 9 )less inclined plane. At the bottom, it has a speed of 9.80 m/s.yg9 dx1 ,sq6 mwvdx,zocy(bc)v *9z *r 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. umpxz6) . q.a-4 afpdx When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is itap6ux. q4fzm.d)-pa x 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, weighine )( hp8wur;bx ad3e2vg 10 N, blasts straight up from ground level with a kinetic energy ofa)w u8(x3e2v h rpebd; 40 J. At the exact top of its trajectory, 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 the ground w i guwa6f78/ju;uk-qn ith a kinetic energy of 220 J. At the 6j gf-;iuu uan7qw8k/highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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

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

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

D. Impossible to determine without knowing the angle of launch

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rp o.g,i0c 1jmbest 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 0 ibpgo1.cmj,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 at2dt (dt-uw,)-pat-2/ds y;jsanxtom 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 the bottom of ttd-u)o dadtn(w-jp mt-s;sya 22 x/,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 8nzm7+ hnb7pda b c1u:dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of hn+8 ca17dz:bn7bu mp 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 bottom of its s zrcere:89v 3kwing (point

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

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80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pendulum of length 50 cm is pulled 30 cm away from the vertical axi1g p9fdea/h. as and released from rest. What will be ig/d ehpa. 1f9ats speed at the bottom of its swing?

A. 0.50 m/s

B. 0.79 m/s

C. 1.2 m/s

D. 1.4 m/s

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uncompressed h22c5ovc1d f)72vnhfpd gu 8 fhorizontal spring with spring constant o1d h22ogfn 57c vfhpf)ud2cv8 f $2.0 \times 10^6 \; N/m$. 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 stoptolk.kn3hz48 zjw;. 8ov h nl t)arz5; for a red light. What work is do h ;.8o3ttkv a hrll).nnj845zz;wz okne by the friction force against the wheels?

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

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

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

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

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a horizontal surfa q)3j*,.ha uohto;okd ce is 50.0 N. If the initial speed of the object is 25.0), *hujoo3q t.k;da oh 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 J of kinetic enel8*n j8r*)z 8xccmgc1 .2b8by bst f:o)vac oxrgy. The friction force on it is a constant 0.50 N. How fob x l)8f88g. cv*:xcz1n2)r ysoc8mtbjca*bar will it slide?

A. $2.0 \; m$

B. $12 \; m$

C. $24 \; m$

D. $48 \; m$

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to (fbs6- dg ;8--taha pbdg u*wz)/hn(5t kzmioa 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 changeh wpdikz-hb go-;ub g6za-(n*(t)/5mds af8t in its kinetic energy?

A. $20 \; J$

B. $39 \; J$

C. $46 \; J$

D. $61 \; J$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slope. If the work hv6o(av4fk8 p done by h8vpv(6 k4foafriction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

A. 17 m/s

B. 24 m/s

C. 34 m/s

D. 31 m/s

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an inclined plane. The plane is 4 :0,bdkel(, ze 2,dxeulenx 5m.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average frictibdm5n0dxe l e: x,(k ,lzeu,2eon 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 wawfpt1w mn0 97l/r:yz-m:u efrom rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the p mu-lww9 tfr0 7ne w:y/1z:apmlane 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 fro3n) dsedwgk/ p 2 i.vi-nmt (2w(ybiq0m a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as 2sn/ e(myb-( 0ndtpi. wgi wiv)k d32qit 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 qrm-9i3rp l63 xfc+ usruns up a flight of stairs 10.0-m high,ux6i-rfpc lrm qs+933 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 obj xa7e- 3eld-au)x zi3fu yiwlk002su :ect with a constant velocity of 5.0 m/s. What power must be dela u)7kxe0w0 li:xa3-izse2u u-lyf d3ivered 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 oq-+oqat6e m/ 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W)ma+ q/eq o-t6o

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. 3zq*fl28hxlif ry nc(j+t,- oHow much force does her foot push with when s 3rl+2q nfco* f ,8(i-jtlyxhzhe is traveling at 8.0 m/s?

A. $31 \; N$

B. $63 \; N$

C. $80 \; N$

D. $4000 \; N$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What yysl ;05krv2ie)sv z -is the average power delivered by the engiy;20vev s-s5y) l rikzne? (1 hp = 746 W)

A. $60 \; hp$

B. $70 \; hp$

C. $80 \; hp$

D. $90 \; hp$

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