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习题练习:Physics Unit9: Static Equilibrium, Elasticity and Fracture



 作者: admin   总分: 44分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月27日 22:54  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What condition or conditionm+xj,rspz6 a3s are necessary for rotational equilibrium?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What condition or cobn t-xb9ilm5 u kvkbul2;2*x, nditions are necessary for static equilibrium?

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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 an. 4z e6iu:v4(fmyne uz 5r7vnt rest above your head the net force on the book iz.n7v 6 : efumivn u4y4en5(rzs

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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 +net -klvy3,ho. qdx; constant velocity of 9.8 m/s. What net force acts ohx3t- . d +ekvolny,q;n it?

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5#
 
  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 Nub8auk2wx+-aq1as43y y y f2 o stands with one foot on each of two bathroom scales. Which statement is definitelyou41ay2s q-wbxa +aku3y28yf 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 massle3x zn15;gircc1k4 zlca 7pk*ass seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the 4kp;7l1zcxn5c1kac z i* arg3seesaw?

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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 iswp3t 4 rzh*n;v in

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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 horiun cu qjpd1-f.(d 9r-pzontal tabletop is in

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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 x 6.0 ghur9 oejsgz5 t764owox ce)* :-1mnocm. 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 the tablen-mze*:o uoc6oj9 e5xgh 4g)tw7 sro1 edge without toppling?

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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 dis o.apy;,hy yj3de8b7 cn66kbu tances apart on the edgcohyb . nduje,6ybk63ayp 8;7e. What minimum mass, placed in the middle between two supports on the table's edge, will cause the table to overturn?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Stress is

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Strain is

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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, co1 who6 *8nu6 ga4ozoh(hkvb(p ;-qgz opper, and steel. Which wire oqhunzh(p6( -aob*;k8vz46 w o1h ggowill stretch 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 subjected to minimum tension of 36 N. If33 ,pbh/vliq. qk0jlc:emn0p bm0hjz4,gc s( the wire diameter were half as great, we would expect the wire to break when subjected ,pghjqvl0hncc leb0 (j:i .3,3/mpk 4zm0sbqto a minimum tension of

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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 a *ora-hbz 6 uhp7xcbuf0/ )d-at the base of a pointed arch a/6-hhpdcu*-ru) 7b b0 azofxis

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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 distwzy ol. l2 210nmrt0imq h1vp)ance from the fulcrum to the weight to be lifted is 1.0 m. If a wv 0p.zi1qmnlt1yl 022wm) rohorker pushes on the opposite end with 400 N, what is the maximum weight that can be lifted?

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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 fulco csq76b) m) saafc2ukv,jl; 0rum to the weight to be lifted is 1.0 m. If ,cs6l jq u2; o)c7 ambkv0a)fsa 3000 N rock is to be lifted, how much force must be exerted on the lever?

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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 seesawtvgzl) vdw;ao8 u++g6. 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 side of the seesaw, where must the gdalg+vo)+u;86 gzvtw irl sit on the other side?

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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 pivotso el3288yvlh *ba 39xgpc(f zz in the center. Child A has mass 60 kg and pv* hyf 8bxl8ecz9ao33(g2zl sits 2.0 m from the center. Child B has mass 40 kg. How far from the center must child B sit for the seesaw to balance?

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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 d1tyh/m+-- 40vm8 iemmjtda g dki27 pN supports two children weighing 500 N and 350 N, respectively4m-1 2i0amg8v t-yt djhm +ek pimdd7/. 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?

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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 supafh6 lnvq2-7h ar3bm /ported by two ropes at the ends. If a 400-N person sits at 2.0 m from the lf v3mqal7/h2habr -6n eft end of the beam, what is the tension in the left rope?

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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 we t+mk+5bxy9s0k hxej6ight 100 N is supported by 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 tension in the right rxsty+k9jhe0mx6k b 5+ ope?

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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 upg ubqhtrwstie3s68 u4 1q9, -l by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left endbt q3-hsl1 u48uwrg,9i6 ets q. What is the tension in each wire?

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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. +fbpwb492 8;yeabjvgThe scaffold is 18 m long. A 65b4;y pbgjew+vf 9b2a8 0-N box sits
3.1 m from the left end. What is the tension in each wire?

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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 kni4x 63p5qqu4r2q g rivnfe edge at the 50-cm mark and has masses of 0.40 kgn u4 pq3gv6iqr5xr q24 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 balance?

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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 an+z4k v,h9wh*q 3lvdft d length 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 end, how far from the right end is the perso3,vzhd+9 lkt wq*h fv4n?

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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, anl2zfa cxnnew70sd-hh 0 -8z7zd a plank of mass 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 ri0 e0zzhl72ad7w-ncz- x 8nsfh ght 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?

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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 qpwar u +3dv:3connected by a wire. A bird of mass 0.50 kg lands on the wire midway bv dqw+au:3rp3 etween 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?

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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 kg ang+li+xm1) cw , kbgk-xd its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm ew,)i -+gkgm 1bxck lx+xert on the lower arm to hold a 7.5 kg shot put (Fig. 9-1)?


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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 c4ticp zn/x /)outer wheel base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is tcpn)/ izc x/4the maximum sideways angle at which it can be inclined without tipping over?

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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 abou+lo qve;-g lg1t 7.0 m in diameter. The top is 4.5 m off center. How much far1gl+vlq;e-g o ther can it lean before it becomes unstable?

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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 mucjpsn381mc t jt7na /k6h force would be needed tosant71c3jtk6p/ 8nj m compress the block by 0.0125 cm?

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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 cross-sectionv5nl; 8cj 9w72fz)cwb hs8d2n u;kxoh 4ovky- al 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?

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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 sfy(b3h: shw,ds sab1r5y;u t2ervice station is 4.0 m long and 0.20 m in diameter. Young's modulus ,:(u b3sdsys5;f1rhw hb 2tayfor steel is $20 \times 10^{10} \; N/m^2$. By how much does the column shrink when a 5000-kg truck is on it?

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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 force is applied )rpk 9l5+0*ngfu-b rdh 3fykd. Wh9 3br)dd +0ykkh5pgnl*r - uffat is the elastic modulus of the wire?

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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 66d aytq-e8i;egfve3 diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus for steel ig3vae6 q fi;e-6e y8dts $20 \times 10^{10} \; N/m^2$.

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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 o ujr*p m5gpjoo)v05u co.xt20n crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on5j vgu u5rcop.t) p m0j0oo2x* the floor?

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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 m v3+v; j 2-uffij3gpeof $1.250 \; m^{2}$. It supports 1875 N. Find the stress on the column.

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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 k:pwuo02w te /*zy2xi6fj g hsyn,/s1 10.0-kg mass. What is the st/*:k w,typ eu w206z1y2osgj s/nhifxress in the wire? (The Young's modulus for aluminum is $7.0 \times 10^{10} \; N/m^2$)

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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 in diameter suppo -t;uy6o1ghbleuu a )t +8swg9rts a 10.0-kg mass. What is the elongation of the wire? (The Young's moduly8bu o ;aug)hg6t-1 +eswut9lus for an aluminum is $7.0 \times 10^{10} \; N/m^2$)

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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 one (w. fbmwi,4fzface of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus fib(wz w,4fm. for aluminum is $2.5 \times 10^{10} \; N/m^2$)

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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 pre47v6d2wuyb 6/g h dw1csdohymwy/3c7ssure has increased by 100 atmospheres (to abood/wmsy6w 7 d2ywy6 /41d7c cbvg3huhut $10^7 \; N/m^2$). By how much has $1.0 \; m^{3}$ of water been compressed by this pressure? The bulk modulus of water is $2.3 \times 10^9 \; N/m^2$.

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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 cojkdwdohi.7o7)s),zz(n uhu/ mpressive strength of steel is hh /,kiw7 d)u7d n(zjzso.ou)$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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