Physics Unit9: Static Equilibrium, Elasticity and Fracture - 无忧得胜-网上国际课程 (5edu.win)

1#

What condition or conditions ar,nke2jz phg 5-u g/p:be necessary for rotational equilibrium?

A. $\sum F_x = 0$

B. $\sum F_x = 0$, $\sum Torque = 0$

C. $\sum Torque = 0$

D. $\sum F_x = 0$, $\sum F_y = 0$

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What condition or conditions are necessary for statw fkw71t ep0ka6n q- /8ap- kasfxpyiubm71)-ic equilibrium?

A. $\sum F_x = 0$

B. $\sum F_x = 0$, $\sum F_y = 0$, $\sum Torque = 0$

C. $\sum Torque = 0$

D. $\sum F_x = 0$, $\sum F_y = 0$

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A book weighs 6 N. When held at re4r aiz4pj,5to-pf7 kest above your head the net force on the book tfo ke-p754 ,izr a4pjis

A. 0 N.

B. 6 N.

C. 9.8 N.

D. -6 N.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rocket moves through outer space with a constant95(q l3ib:vqh 8qebvv , 4c38f7ciui1d qnlse velocity of 9.8 m/s. What net force actv48 315 fle:lh( cqsuq73ndqe c9qbi,v vi8 bis on it?

A. a force equal to its weight on Earth, mg

B. a force equal to the gravity acting on it

C. The net force is zero.

D. cannot be determined without more information

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5#

( 1.0 分) 切至整卷模式搜藏此题

180

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person weighing 80* ac,5(frkqu,pcx4xcy bf9 +f 0 N stands with one foot on each of two bathroom scales. Which statement is drcqx fx5(9p f fb*u,4+c,cyakefinitely true?

A. Each scale will read 800 N.

B. Each scale will read 400 N.

C. If one scale reads 500 N, the other will read 300 N.

D. None of the above is definitely true.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A heavy boy and a light girl are balanced on a massless seesaw. If they bothc,wd+r5+4jsob j3n cjox p1n+ move forward so that they are one-half their original distance from the pivot point, what1n nj+dbw+4xo pco+3s5jc, jr will happen to the seesaw?

A. The side the boy is sitting on will tilt downward.

B. The side the girl is sitting on will tilt downward.

C. Nothing, the seesaw will still be balanced.

D. It is impossible to say without knowing the masses and the distances.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cone balanced on its smals5ll8sp9nn im/jqf1q-( 5 rhll end is in

A. stable equilibrium.

B. unstable equilibrium.

C. neutral equilibrium.

D. positive equilibrium.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cube resting on a hou z1y+*m ovu9lrizontal tabletop is in

A. stable equilibrium.

B. unstable equilibrium.

C. neutral equilibrium.

D. positive equilibrium.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two identical bricks, each of dimensions 20.0 cm x 10.0 f2qb5 tg,a )ou+oxeq5) j v8llfkp09acm x 6.0 cm. One is stacked on the other, and the combination is then placed so that they project out over the edge of a table. What is the maximum distance that the end of the top brick can extend beyond to)j5)upq,l ko9tf +av5qlf2eba08g x he table edge without toppling?

A. $7.5 \; cm$

B. $10 \; cm$

C. $12.5 \; cm$

D. $15 \; cm$

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 36-kg round table is supported by three legs placed equal distances apart onlq yws :8ewd7) the edge. What minimum mass, placed in the middle between two su)ys8 qw:wd7 elpports on the table's edge, will cause the table to overturn?

A. $12 \; kg$

B. $24 \; kg$

C. $36 \; kg$

D. $48 \; kg$

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Stress is

A. the strain per unit length.

B. the same as force.

C. the ratio of the change in length.

D. applied force per cross-sectional area.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Strain is

A. the ratio of the change in length to the original length.

B. the stress per unit area.

C. the applied force per unit area.

D. the ratio of stress to elastic modulus.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A mass is hung from identical wires made of alumin,sra ehh;q:m. -j*(q wrobt(tum, brass, copper, and steel. Which wire will stretch the lr sh*.q-m(qbatowj;e (h :r t,east?

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A copper wire is foundfms uld3l:cf.ie w63: to break when subjected to minimum tension of 36 N. If the wire diameter were half as great, wcw 33i eu.:lsff:dml6e would expect the wire to break when subjected to a minimum tension of

A. 9.0 N.

B. 18 N.

C. 36 N.

D. 108 N.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The horizontal component of the buttressing force atl. wmkgcw(5.;kbvfs 8 the base of a pointed arch (.v5bwlcf;mk w8skg. is

A. less than that of a rounded arch.

B. equal to that of a rounded arch.

C. greater than that of a rounded arch.

D. zero in magnitude.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lever is 5.0 m long. The distance from the fulcrum to the dsd:hyrs;4 ue +,k7q cweight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that canrkqdu,s;yc7e h+4 d :s be lifted?

A. $80 \; N$

B. $100 \; N$

C. $1600 \; N$

D. $2000 \; N$

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lever is 5.0 m long. The distance from the fwvea1f h;la :,2k /exculcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted ; vl :k1/,2acee xafhwon the lever?

A. $600 \; N$

B. $750 \; N$

C. $3000 \; N$

D. $12000 \; N$

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A boy and a girl are balanced on a massless seesaw. The boy has a mass of 75 k1gwm*/d9): ppb tccxkg and the girl's mass is 50 kg. If the boy sits 2.0 m from tht)cg mp: /bcpwkd*9x1 e pivot point on one side of the seesaw, where must the girl sit on the other side?

A. $1.3 \; m$

B. $2.3 \; m$

C. $2.5 \; m$

D. $3.0 \; m$

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two children sit on opposite ends )st3an,t* zhkof a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg. How far from the cente)th znatk*3s,r must child B sit for the seesaw to balance?

A. $1.3 \; m$

B. $2.5 \; m$

C. $3.0 \; m$

D. cannot be determined without knowing the seesaw's mass

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A uniform board of weight 40 N supports two children weighing 500 N and wwcos ;um ;q (rp9jh eu(+i5b/350 N, respectively. If the support is at the center of the board and the 500-N child is 1c+9;(; up j(5/whiqrowues mb.5 m from the center, what is the position of the 350-N child?

A. $1.1 \; m$

B. $1.5 \; m$

C. $2.1 \; m$

D. $2.7 \; m$

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-m uniform beam of weight/no/ju /x -,ezha(vk j3gp 2yl,mha6y 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end/,xjhe 63h pjym, /-v (yozgnaula2/k of the beam, what is the tension in the left rope?

A. $130 \; N$

B. $250 \; N$

C. $370 \; N$

D. $500 \; N$

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-m uniform beam of weight 100 N is supported by two pme;3jq +oyt g l7y-0n)ayxc 8ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in thex tca)y;3n 0+qjeyl-mo gy8p7 right rope?

A. $130 \; N$

B. $250 \; N$

C. $370 \; N$

D. $500 \; N$

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A massless scaffold is held up by a wire ke59wvv-o,oxz8eg i5, u xi)rat each end. The scaffold is 12 m long. A 300-N box sits 4.0 m xxu5iw5rk8v )vgooi9 ,e-, ezfrom the left end. What is the tension in each wire?

A. left wire = 100 N; right wire = 200 N

B. left wire = 200 N; right wire = 100 N

C. left wire = 900 N; right wire = 2700 N

D. left wire = 2700 N; right wire = 900 N

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 200-N scaffold is held up by a wire at eac5t5mp 5tkdp)h gs;e (bh end. The scaffold is 18 m long. A 650-N boxh;5bt5(pp)mse kd g t5 sits
3.1 m from the left end. What is the tension in each wire?

A. left wire = 520 N; right wire = 130 N

B. left wire = 640 N; right wire = 210 N

C. left wire = 195 N; right wire = 975 N

D. left wire = 295 N; right wire = 1000 N

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A uniform meter stick is supported by a knife e 7 z92tej ou r 4*jtcqi5z7.:dir2ioqedge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. Where (at what mark) should a third mass of 0.30 kge 7ei29zj 7iro:.5r i *ouqcztdt2qj 4 be hung to keep the stick in balance?

A. $20 \; cm$

B. $25 \; cm$

C. $30 \; cm$

D. $70 \; cm$

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-N person stands on a uniform board of weyo u:c)6sh z)oight 100 N and length 8.0 m. The board is supported at each end. If the support force at the right end is toch):u)zso 6yhree times that at the left end, how far from the right end is the person?

A. $4.0 \; m$

B. $2.0 \; m$

C. $1.6 \; m$

D. $6.4 \; m$

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two scales are separated by 2.00 m, and a plank of masi7/ccud 1 5we t5vva7is 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the riu e15t577iv vd/wciacght scale reads 30.0 kg and the left scale reads 50.0 kg. How far from the right scale is the person's center of gravity located?

A. $1.20 \; m$

B. $1.23 \; m$

C. $1.26 \; m$

D. $1.30 \; m$

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two telephone poles are separated by s;86r 2jym ,d -lsxhsh40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0 m below horizontal. Assuming the wire has negligible mass, what is the tension in the h sh2 l,6s m8rjsd-y;xwire?

A. $6.2 \; N$

B. $12 \; N$

C. $25 \; N$

D. $50 \; N$

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Assuming the lower arm has a mass of 2.8 voy/bni-12+,vgus+fhce yd0 kg and its CG is 12 cm from the elbow-joint pivot, how much forcec +yg+s hvu20dby1 /of ei,-nv must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put (Fig. 9-1)?

本题所包含的其它图片:

A. $100 \; N$

B. 500 N

C. 1000 N

D. $1500 \; N$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A passenger van has a:m 6kz.af a c(egbsr:td+) tbvkcm854n outer wheel base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the gromccd(8f e b5.tsk4 g:+ )avb6ram: zktund. What is the maximum sideways angle at which it can be inclined without tipping over?

A. $32.6^{\circ}$

B. $39.8^{\circ}$

C. $50.2^{\circ}$

D. $57.3^{\circ}$

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Leaning Tower of Pisa is 55 m tall and about*/h/oo1vd.cqz3tfphf h+h-*x a5 kk m 7.0 m in diameter. The top is 4.5 m off c/cq3zf5mhk * +.kfoxhvht/dp h-1*aoenter. How much farther can it lean before it becomes unstable?

A. $0.5 \; m$

B. $1.5 \; m$

C. $2.5 \; m$

D. $3.5 \; m$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 5000-N force compresses a steel block by 0.0025 cm. How much fovuub. zeo4 t6:7 pg4vyrce would be needed to compress the block by 0.0124uu 6e. zbvy7 gtop4:v5 cm?

A. $1000 \; N$

B. $2500 \; N$

C. $5000 \; N$

D. $25000 \; N$

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cable is 100-m long adr+ zmigl (mqo-ds: 6+nd has a cross-sectional area of 1 $mm^{2}$. A 1000-N force is applied to stretch the cable. The elastic modulus for the cable is $1.0 \times 10^{11} \; N/m^2$. How far does it stretch?

A. $0.01 \; m$

B. $0.10 \; m$

C. $1.0 \; m$

D. $10 \; m$

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A steel lift column in a service station is 4.0 m lon;7iw yue9m(apm1 z s7 9brdfd7g and 0.20 m in diameter. Young's modulus forzb7y1 ru9i9m aw(7 sdd efp7m; steel is $20 \times 10^{10} \; N/m^2$. By how much does the column shrink when a 5000-kg truck is on it?

A. $8.0 \times 10^{-7} \; m$

B. $3.2 \times 10^{-6} \; m$

C. $7.8 \times 10^{-6} \; m$

D. $3.1 \times 10^{-5} \; m$

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A wire of diameter 0.20 mm stretches by 0.20% when a 6.28-N formr,t:82 ws ,cagnbtu- ce is applied. What is the elg,m:b 8r,ws2 u tc-tnaastic modulus of the wire?

A. $2.5 \times 10^{10} \; N/m^{2}$

B. $1.0 \times 10^{11} \; N/m^{2}$

C. $2.5 \times 10^{12} \; N/m^{2}$

D. $1.0 \times 10^{12} \; N/m^2$

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A mass of 50 kg is suspended from a steel wire of diameter 1.0 mm and h xzj0dc7cx -7p3l7v klength 11.2 m. Howjczch kv7x3 lxd77p -0 much will the wire stretch? The Young's modulus for steel is $20 \times 10^{10} \; N/m^2$.

A. $1.5 \; cm$

B. $2.5 \; cm$

C. $3.5 \; cm$

D. $4.5 \; cm$

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Suppose that an 80-kg person walking on crutches supaf7k26ab // 3h:pkfy q3peypow jzx /-ports all his weight on the two crutch tips, each of which is circular with a diameter z:7o/py6hx/pfy k /awf3kq3-a bpj2 e of 4.0 cm. What pressure is exerted on the floor?

A. $78 \; kPa$

B. $156 \; kPa$

C. $312 \; kPa$

D. $624 \; kPa$

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A bridge piling has an area /.mv7pmtbg4hj)x /ng of $1.250 \; m^{2}$. It supports 1875 N. Find the stress on the column.

A. $1875 \; N$

B. $1875 \; N/m^2$

C. $1500 \; N/m^2$

D. $2344 \; N/m^2$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An aluminum wire 2.0 m in length and 2.0 mm in diameter supports a 10.0-kg massoo w3a.hrh+fh0x 2vv 3. What is the s avv oh3r2+xo3hw f0.htress in the wire? (The Young's modulus for aluminum is $7.0 \times 10^{10} \; N/m^2$)

A. $3.1 \times 10^{7} \; N/m^{2}$

B. $6.2 \times 10^{7} \; N/m^{2}$

C. $9.3 \times 10^{7} \; N/m^{2}$

D. $1.2 \times 10^{8} \; N/m^{2}$

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An aluminum wire 2.0 m in length and 2.0 mm (dw*kzjv- r8fin diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's movw8r *j( -dkfzdulus for an aluminum is $7.0 \times 10^{10} \; N/m^2$)

A. $0.11 \; mm$

B. $0.22 \; mm$

C. $0.33 \; mm$

D. $0.89 \; mm$

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A shear force of 400 N i ) r .ko5xwd/t+wgpo8hs applied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for aluminum w)g5r.h8xko /o+t pw dis $2.5 \times 10^{10} \; N/m^2$)

A. $1.9 \times 10^{-8} \; m$

B. $4.4 \times 10^{-8} \; m$

C. $5.3 \times 10^{-8} \; m$

D. $8.2 \times 10^{-8} \; m$

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教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At a depth of about 1030 m in the sea the pressure7*3 cnwe:tol-o5fd t- 1kbjc f has increased by 100 atmospher3kltno1bfw5:edjc-c*f7- t o es (to about $10^7 \; N/m^2$). By how much has $1.0 \; m^{3}$ of water been compressed by this pressure? The bulk modulus of water is $2.3 \times 10^9 \; N/m^2$.

A. $2.3 \times 10^{-3} \; m^{3}$

B. $3.3 \times 10^{-3} \; m^{3}$

C. $4.3 \times 10^{-3} \; m^{3}$

D. $5.3 \times 10^{-3} \; m^{3}$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 55-cm brass rod has a d4 akewr)lox. fm0kk,9 ldr3i4 iameter of 30 cm. The compressive strength of steel is l03r xo,ak44r) mwfldei.kk 9$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

A. $1.8 \times 10^{7} \; N$

B. $1.4 \times 10^{8} \; N$

C. $2.4 \times 10^{8} \; N$

D. $4.5 \times 10^{8} \; N$

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