Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational equili9xj zt3ng) jj4brium?

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 arkr* d8.6 m(cnci7rlkc8l wa ,ee necessary for static 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 rest above your head the net force on thes ( e;myu-ova954wsvt book iss vtmov4wsu-ea (5 ;9y

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 constant velocz*j :a0rru1: k+imu totc r r-a9te(.xity of 9.8 m/s. What net force acratu9*(x: a o10rr rc+t:kut-m.ejzits 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 800 N stands with one foot on eachw3m/me8ujh1 g4v qyf 5 of two bathroom scales. Which statement is definitely tru u1v w/fgq85yhm4mj3ee?

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 t(wt) +xd.nxf 4tmuye4hey both move forward so that they a+. nx4e4t( uwf dm)xytre one-half their original distance from the pivot point, what 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 sm 2lzuka,qk-p. (qb)2glcyr: ball 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 horizontal i 2da xyq,xe at88 2e;x foc-;zw/nhr)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 cm pf0c5d nj hrh 7)kh)5k8j5nn xx 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 tarxn0j n55j5c7kdphh8 hn f) k)ble. What is the maximum distance that the end of the top brick can extend beyond the 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 ap 9cih1x-ms oi55;ayfuart on the edgf;-5ci95mxo h aiy1 sue. What minimum mass, placed in the middle between two supports 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 v*/*ufb*faj 5 zmr,flidentical wires made of aluminum, brass, copper, and steel. Which wire will strlj,* baf*vz5* frfm/ uetch the least?

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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 found ty*4 8rgo bu k6qy)q)m*c ken)fo break when subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break wn)*b64g )k*c)fuyqro mye q k8hen 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 forbfz43fx;,i dw ce at the base of a pointed arch i wfdx;3zbi ,f4s

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 weight to be x7 zzlu5)5a2 bqg2dwp lifted is 1.0 m. If a worker pushes on th 2pdax52gl) qzzb7wu 5e opposite end with 400 N, what is the maximum weight that can 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 then(wc t4 gjevdia/6i :) fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, howa) 4n:j(i/ wtcid e6gv much force must be exerted on 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 ha2mgm;e + y6fc5-di huvs a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one side of the seesaw, where must the girl si dme2g- hui5 6yf+cv;mt 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 of a uniform seesaw which pivots 3mnbz 3 ,h5oatnv4-v:6drkpp in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mas 63 -v4p:nznptaovr3mdkb h, 5s 40 kg. How far from the center 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 supponi+cse*rh( rw8z8d u:)e,n mhrts two children weighing 500 N and 350 N, respectively. If the support is at the center of the board and the 500-N child is 1.5 m from the center, what is the position of the 350-N chh +e)8du:mishrn n e*rw ,zc(8ild?

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 100 N is supported by tuclw3:d2h:iabq/mmsyy*s:m7ha9, havf 7 c(wo ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tensio /a :sh97*:w23 fy s:i,lqdahhcmm(uy b7cv man 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 ropes at ty lqn/aq7mu 1;+pxkf s)( z y2 pgtb2j(y/hz3dhe ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in the right rfylxbny;u2(pyz hj3 qagt/( q d+ mp)k2s/1z 7ope?

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 at each end. The scaffold is 12 m lon zm2;ym : p*ngalokz u6)r,.cng. A 300-N box sits 4.0 m from the left e p2o6lna.m zc)mn*u;, kgy:r znd. 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 each end;imb);q,c nsg9dt,* vr q-mqu(wf6 ni . The scaffold is 18 m long. A 650-N box sits9; ,-gcqb fmt*wqvr)ndq( u;ms in6,i
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 edge at the 50-hpziczi j70t+ 9:e.m*hi/m gccm 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 kg be hung to keep the stick in bc0i.g zez/m jti+p c m:i*hh97alance?

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 weight 100 N and lengvk, 44w 4lh 8+s1biejbkbwp8p th 8.0 m. The board is supported at each end. If the support force at the right end is three times that at the left end81, bve8ib4pw4 j+ks4wpb lh k, 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 mass 4.00 kg is- p5d,sp0g uyapq)-j o placed between them. Each scale is observed tog-ppp)j5 y0u -daq,so read 2.00 kg. A person now lies on the plank, after which the right 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 separatlabr)lpy3e9 dv7nsn/4:* w gm ed by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire n 3ar9nvb l4l)*w d/pys7 em:gmidway 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 wire?

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 /64v-iv3r w5e4lu- gax riji hkg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in 4e-xgvl/h4 ua5r6-irw 3 iijvthe 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 an outer xux; lih3 w4)twheel base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. Whhx4; ixwu)l t3at 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 7.0 m in diameter. The top is 7yyfkzzk hq) 6hq3m0: 4.5h 0z3h)ykmky 6z:qq7f m off center. 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 bjnjboyw408 0gsm2e d*y 0.0025 cm. How much force would be needed nby 0sdw 0goe*m2j4 8jto compress the block by 0.0125 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 and has a crog :;omy l3e)anss-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 long and 0.20 m in diamea; appq j/p 2*h*rshm3axqs:7 ter. Young's modulusp*7 qprs pha2x*;hs j :qa3/ma for 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% whe0yrc7/ur;t(ksmlt8g6 b xog3n a 6.28-N force is applied. What is the elastic moduo 0c rug;rkt3/lx86btsy 7m(glus 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 length 11.6 vci6rio9 lzr668n qu2 m. How much will the wire stretch? 6zir9lq66v 8rcn o i6uThe 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 p ) i1+*jgvduejda.7u ,se nyr6erson walking on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. u e in67)s vrd1*uy,j+jdage . 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 ofxb+f c5okyng1(y. 31rb jd/uo $1.250 \; m^{2}$. 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 su, 7tlgjwao42cft6jy8 55sa vp(jmzo 2pports a 10.0-kg mass. What is the stress in the wire? (The Young' o5jc4tj,p27ltfga j wy v o8m6az25(ss 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 7mqe7y5k( h0nq2gxug cel7 r9o vv55d 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modul55 e7cx05ve 7vm2nuqyr7q(9gghko d lus 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 is applied to bkd2a7v94mko2,ijva z 9lejfk97(v ione face of an aluminum cube with sides of 30 a4j(2b9a oeijk7,k9 97vdz2m vfivl kcm. What is the resulting relative displacement? (The shear modulus for aluminum is $2.5 \times 10^{10} \; N/m^2$)

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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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At a depth of about p.vi om()4fk1wieb3t 1030 m in the sea the pressure has increased by 100 atmosphefii .(wt1v 4o3bk) epmres (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 diameter of 30 cm. The com ezxw .j9vembsm:/ku rgl60 6;pressive strength of steel is be0:6xjls.gzk euvm ; 69r mw/$250 \times 10^6 \; N/m^2$. 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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