Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for x;m6zy( 6jhgnd b1p (3mytl1zrotational 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 con++pgcnr ,qt(mditions are 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 he,w0 .h.xnfneuad the net force on the book uw,fe 0. n.hnxis

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 velocity of 9.w) 4sj;x- hcch x2x k)sp*mt(t8 m/s. What net hjx2stkp-hm xcx4 ) stw;c*)(force acts 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 standp*1f m0vrp*af- qwk0w t/s gl5s with one foot on each of two bathroom scales. Which statement is dl0 *agtvfm*k5rp /10p -fsqw wefinitely 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 mahkao 82saj wbqz y:i3 )+)z4pvssless seesaw. If they both move forward so that they are one-h)q8: kzjvsw3i +y4 )hbazpo2a alf 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 small end is r 4hvc80j suh1in

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 tabletu9emip 6;l:omop 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 jg*g;gp ,/gt/b ul ii1(6cuy nx 10.0 cm 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 c,n ii6bj lt/g u1( */pyg;ucggan 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 equgj9wmcj ql -b.(3;ks c/oj6tzal distances apart on the edge. What minimjj-3b c .c9(s6z;jktq /mg owlum 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 identical wires made of aluminum, brass, coep5 vp2k*u )pxq 7lf+p7e2glypper, and steel. Which wire will s fpq pglulvkx y+5)7ep *22e7ptretch 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 to break when ovqkt 55m3w,043t)lt bmbpnl6 w2 outve; 6aosubjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a33b46q 5 526 ab ,mtk pttonuoom0l)vevwwt;l 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 at the base of a pointed y6nt edzgx6.or:g 8 vxc3+1xgarch isvxdyzc+ ggtr. g6o 168 x3:nxe

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 thp8t ;yg5m4 0 h2c2cauylw5s m4h9drxl e fulcrum to the weight to be lifted is 1.t hx4u;05r mcplm42yw8a y2ghc sd l590 m. If a worker pushes on the 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 the fulcrum to the wp u 8di7o+ym 1t1vvkf- 0)d,zyva*m jkeight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be ,i j f70u1yp m1dkavv-)z*k dmt8+v yoexerted 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 balan *he9,zyy*,fdar2g kdced on a massless seesaw. The boy has 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 ser *hka,yf2 *gd,yz9dide 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 of a uniform seesaw whichqj9 ib:g-h5n.jq n:fl 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 farqij:5l9ng qbj :n-. hf 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 supports two children weighing 500 N and 35v3fhfv4c+h ha )d 9c- fbhf;+l0 N, respec3ald;vhf f)9+-f fhcvbh4 c+ htively. 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 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 100f )x( llyg;lqy4v /4cotet9l; zvn;m. N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the le ( ;to xnvmll;9vtc4y/f).lqe4; lygz ft end 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 ba ywb 0)l3o(zry two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tens3r(o lz0 awby)ion in the 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 at e a;sy3nxod169)g upj tua-9d 0ubipv4ach end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. dnpospv;uga9 3uixb4yj1ud-0) 9a 6tWhat 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 w1sh; f:v2oep rj 2fonk:g/ /wdire at each end. The scaffold is 18 m long. A 650-n/: 2sfv2 fhepgrw;:jok/1do N box 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 suge uet;q30 tmu2 n/*pppported by a knife edge at the 50-cm mark and has masses of 0.40 kg et nmp/*;uq u3p2g0e tand 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 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 oc n36:ww eg;xl 0/souqhu86j ff weight 100 N and length 8.0 m. The board is supported at u 3g8;w0o6f/suhxq: wl6encj each end. If the support force at the right end is three 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 separatea;w-y7ml myc rjl)iye(c xm-g7 62u,vd by 2.00 m, and a plank of mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. mm)crgy v-y (26mxje7y;7ca ,-ilwulA 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 separated by 40 m and connected by a wire. A bihvrk7h1ts b2 i b:co54rd of mass 0.50 kg lanr7bs1 ot 4ih bcv2:5khds 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 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.bg:gjxp ,lbrdc)bf0;o zr *;3l ma)g28 kg and its CG is 12 cm from the elbow-joint pivot, how muc*g dx,bg 0r2lb ;rbfp 3l;m:ao))jgzch force 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 an outer wheel base width of 2.00 m. Its center ob f;dgkr8(8)y9vyuk3d s /;9mbt kzepf gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sidewaky3;e rukbb(ms9td;g8kd 8)f/py 9z v ys 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 diamet8b:l*i*r5rxmp f9ddmnnv/+- p ef* pjer. The top is 4.5 m off center. How much farther*lp/:- pdi*db8 nf+f r 5pvrn*xmemj9 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+)2 /4 i.iwljpmen/h;yjdrmp force would be needed to compress the block by 0.0125 ;n4emjl2 d/ p)h+ii jmp/r.y wcm?

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 hqbx3h ;j .coz,as 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 long ftub sz)0i-t(and 0.20 m in diameter. Young's modulus for sfb-s)i( t0 tzuteel 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 by5q: n5ru;dlpwe. iw 2od/yv5k* ddx1ad1y 8f c 0.20% when a 6.28-N force is applied. What is t1dl diody1n5 xqa8:y*;w u5k .pc2ed5wfd rv/he elastic 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 ato73z /me2n8n2t)gxfsrtv1a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young'saoz 2vn 8x3r sem/7)tt12 ntgf 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 y0/lfwv- g 7mbmq-j.ywalking on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. W.7 -/mlvyy0mwb-fgq jhat 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 s+izq; 4no, byvsyobe9 /.w* 4m xjqd(area 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-k k+lse/, *1gi gitd08zpuq0wib m; +f1vcume.g mass. What is the stress in the wire? (The Young's modulus for alumi *lvq0/mi um +eez1g1g.;pikw,cib+tdf u08snum 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 leicj+jf+y 5ni 415 klwtsme 8m4ngth and 2.0 mm in diameter supports a 10.0-kg mass. Whme454cnl+ j5f ti wikj +y1sm8at is the elongation of the wire? (The Young's modulus 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 apl az e6sa(,a6oplied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for 6a6laeos (az, 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 1030 m in the sea the pressure has increased by54d mzcndglo1rim55z x:1 m1r 100 atmospheres 4 m5rd g1 i 1l1cn:rm5ozmdz5x(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 compressive streh lwu6gs6v- 2b4)bp fy u7clv 4es7nv3ngth of steel is6b)eub-ps4 7gn v4vvc 6f2 luhs3yl7w $250 \times 10^6 \; N/m^2$. 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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