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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 63 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，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。本试卷的直接作答链接 https://51fly.win/test63.html
 作者: physics    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 conditions are necessary for rotational fne n va,9)uz)axwgxr 2k+d77equilibrium?

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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 n(gwqu,w 721ycwx).h*e mpzuhyhw /k8- l-klfor 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 at rec azj 0mr ed; m(i6v2yx9zn6)ost above your head the net force on the book cmz r)6ne md0(6xa yvjoi;z92 is

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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 constanh2gx9y vj-r mcbo 9.d)t velocity of 9.8 m/s. What net forrxgoh) j 9v.cy29b- mdce acts on 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 N stands with one foot on eac xq3sv*xl9e 8oh of two bathroom scales. Which statement is definitel8xs qve9* l3xoy 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 theyc4thg em e6q177x.p-pg-cvdc both move forwaq 6 77vdxeg.cptpmg e14c c-h-rd so that they are one-half their original distance from the pivot point, what will happen to the seesaw?

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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 it(e .0ohf:n/ e/i2t auth+ uow8 mrtl3hs small end is 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 horizontal tabletop i)n1rhe n6 8dgp- ls yr7fuv66is 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 cm. br3 f6r x.au*pOne is stacked on the other, and the combination is then placed so thr*bap r6.f u3xat 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 table 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 plail8zqd;svcn1d))q* +ipm 6 gpced equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the tabq)d*cs61pz) inl; mvqpgi 8+dle'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, copper, and qu(dthva)48b( sn, i /tg o1yesteel. Which wire will se g o)ab (,htyv/ 4sqi8n(t1udtretch 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 te58p4 ,( .myh9 -wzf jroaiqrvension of 36 N. If the wire diameter were half as great, w-59.i, fae hzo (my4rr 8qpvwje would expect the wire to break when subjected to 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 buttressingz zcp/6- qnw ht5yp7*z force at the base of a pointed arch npz-p htq*wz6 c/y7z5 is

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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 b uerv 7;udo52te lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight t5;7rv2do ueuthat 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 frop9 ha5sas*xm 2p j(+ukm the fulcrum 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 onaxha k+jps( *2 us9mp5 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 oyn)vh e4jq(:y5yj o;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 side of the seesaw, where must the girl sit on the othere o 4yyv o;j:hjn5yq)( 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 pivots in thfu.sex1eqw9lg( 1w 8 ue 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 center must child B sit for the seesaw to balancq.9g ls8(ww xf 11uueee?

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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 chm/ r kkf07)kvm dujpkt6:,g- dildren 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 t 0kj k fd,uk7) gmmprv:6k/-dthe 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 s yvu0i8au s)-dupported by two ropes at the ends. If a 400-N person 8 v-)0ayu suidsits at 2.0 m from the left 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 weight 100 N is supported by vqe/.)8nanzq fl/svl7 67 aw itwo ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tensan a7 qfi)7le6z.s/qvlvw n/8 ion in the right rope?

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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 scaffoldqjrmn0ih 5myg4er-8ke + so) 8vpmu 48 is 12 m long. A 300-N box sits 4.0 m from the left end. What is theesgvy4)+ 8ouk0iqhrpr-n4 m5mj88m e 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. The scaffold is 18 zjsec*mv)hyti;jhj.7( 9u, p m long. A 650-N bvu9j p. htiyzhm ;,)*cjje(s7 ox 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 s 90dec,o f7 s :pmcql)fd.rtv:upported by a knife edge 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 0.3c,fvtrd 90 df7:cpe s.m:q)ol0 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 wyzd u8*2y1 ojhbk4s w)p:ati:eight 100 N and 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 lef u o:pk:*hday)2wbi 4 1zy8stjt end, how far from the right end is the person?

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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 (qj *ktuag3:nplaced between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the right scale reads 30.0 kg and g:na q k3(t*juthe 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 connected by a wire. A bird of mg,x/frv x /jzg8lw;( to2q/ tuass 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 tq/oj/ggx8; zfwl v x,/ut2r(t ension 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 and its CG is 12 cm fi li 6)g.alchu3p2g-61icy5t sqgp6r2h7 sjy rom the elbow-joint pivot, how much force must the extensor muscle in gp5g qt)gyj6 .a3c 1ul7y lhiirics hp62 6-2sthe upper arm exert 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 outer wheel base width of 2.00 vtwl ty:g;6u7m. Its center of gravity is equidistant from the sides, and posi76ut ;vly:gtw tioned 1.20 m above the ground. What is the 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 about 7.08:v04pt lbo9fkyh4n 9xc reb) m in diameter. The top is 4.5 m o0olkn t8 9h9bf)pbe: 4ry4vcxff center. How much farther 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.)xdiymx:d ;,tu k ,6jw0025 cm. How much force would be needed to compr,xixyu)jd,6k ;dwm: tess 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 c(afsr *i x - t2ql(0vnln:a i0y/zt-da 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?

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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 s1*8ykmcx kj0c tation is 4.0 m long and 0.20 m in diameter. Young's modulus for steeyk cc0*1x8 jmkl 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 appi1,veqc vp; 9nn7xwxq3/ r5yelied. What is the elasticx39rcp,e1vqn5 ;n yq/7 wx vie 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 diameter 1i,-8zly ygmv;f9 mm +*p7zug 9xn5bvp.0 mm and length 11.2 m. How much will the wire stretch? Thz +m p ub7p8vny*-;,mzgiy5 vg 99xmfle Young's modulus for steel is $20 \times 10^{10} \; N/m^2$.

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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 wafdu5,/hteaz35nc : mvlking on crutches supports all his weight on the two crutcht5mza/ecfv5ud h ,:n 3 tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on 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 uxj 2+ s/ke2ycof $1.250 \; m^{2}$. 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 ess1;q28z.p(1 ewvchnrpj *r2.0 mm in diameter supports a 10.0-kg mass. What is the stress ;zqc2e 1rs pn p8h.erv*w s(j1in 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 di ph0d* iry4(:mhw+g p b(oos8a)8erbfyid9 x1ameter supports a 10.0-kg mass. What is the elongation of the wire? (The (4opi ybphbg+ 8 0r* :mdiyh9wd8(fa )seor1 xYoung's modulus 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 face of an aluminu+h 2alph*p 7ihm cube with sides of 30 cm. What is the resulting relative displacement? (The shear modul +2l7ihhah p*pus 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 s-8;rrn92uqoe sv ,hyrea the pressure has increased by 100 atmospheres o y;, -vq 2rsu8e9rnhr(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 $2.3 \times 10^9 \; N/m^2$.

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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 strength of steel iszugl k2) ,k1-ioi :dky;xne2z yx2k12 -kz;ne,zu): gd iikol$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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