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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 equivcun0 wi0xo ;(librium?

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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 staticv+ 5+pg4 rvggj 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 rest above your head the ne4vni5td:4wuv o2z78r qhv2ttt force on the book i:qdiu 75who2rv4vn 42v8tz t ts

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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 9.8 m/s. Whatsytp( nqp h*cq1 ;un)* net force ac*hcp*n;sn 1uyq)tp(q ts 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 each of two bat5dg o bqst..q2hroom scales. Which statemeoq b2tg.s.5 dqnt 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. It ufd46;d9rbkf they both move forward so that they are one-half their original distance from9kb ut4;6 ddrf 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 its small end is ilk )n :4r5meg.imdy t+n

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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 zlcv:5 ei z-l*lfg,,etabletop 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 20.5 dsoi6yv98 xs2(gqq smli1z2 0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combinatioiq 156ld syz(s xqvs g2o289imn 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 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 placed equal distances apart on.efhx+ 8a+ wmy the edge. What minimum mass, placeae+x+hy mw. 8fd 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 allr kk e -a(8/6b2mlbhba4.cj ruminum, brass, copper, and steel. Which wire k/- 8r.arlbkjc el2am( 46b bhwill 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 whet( vv n(0s3:vemc; j at8fs3vtn subjected to minimum tension of 36 N. If tj3tfm8;v0vt t( ne s3 as:v(cvhe wire diameter were half as great, we 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 buttaav tt,0cs6h q ,cy*v74s7tvmressing force at the base of a pointed arch iscsm,c,vh *4vtys t7a07 a tvq6

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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 longjhll;j8d; t: q. The distance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can be lifteqtjd j8hl; :l;d?

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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 weight to be lift0zsath 9x.o7nvk: -mxed is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on the sm 0. 7hvn9:xtzoax-k 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 seesaw. The boy has a mass of 75 kqqk6.kbtbr2 ez, lil/ g-ih(bv/1u n(g and the girl's mass is 50 kg. If the boy sits 2.0 m f .k6kbzn q,(i(qtl2vlbe1uh/bi-r/grom the pivot point on one side of the seesaw, where must the girl 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 oppositejof0(pt t4i mh )e,b*b ends of 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 cent4* (btp, ojhfb0mte)ier 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 N supports two children weighing 500 N and,iinf2c4 q -dd 350 N, respectively. If the support is at the center of the board and4nc2 di -d,fiq 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 supported by two ropes at the ends. -+es qr,4ldd7gv8hik If a 400-N person sits at 2.0 m from the left end of the beam, what is the t4sdhl r,g+v idq-k8e 7ension 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 two rope, wjx5,y,7 wgftra wn-wa,4hq 7zjqa1s at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tensiowy5j hfa7wtw w ,ax, n,zq-1a7g4qr,j n 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;sm)x 9bpb*hkiz)hf 2 wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m fros9z)fmhh k;)2*bb p ixm the left end. 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 hch5vm3trg;7* rh w) ceach end. The scaffold is 18 m long. A 650-N box sitgvw) *r 753hmtc;c hhrs
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 knife ed, nvs gu:bb(/ege 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 kg be hung to k(gnsbeb /v :,ueep 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 uni u*ap:o7y7hhxzey1u+zf.7 ; zaq/4rnit k ev9form board of weight 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 left envupzfk9*zz/;7ne4.hx auqh e7 io+7 1yyrat:d, 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, a-h( gnjfwag5 klhr m)7 .ai;v/nd 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 right scale reads 30.0 kg and the left scalehaj.(ml5f7r; iva h-)wk ng /g 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 sesn9d+:wc ,x bb nq034yrzw +i+rm7lqbparated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on z:9q4+swwr7yrb+ln,bdqim +bc0 3n x 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?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Assuming the lower a0 x2fs0+78 gw/auic *ljl3g-1m d3tvyydstae rm has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivc0 m 1 dv83aj/3ws7y*2adtlysu f0 gxt i-l+geot, how much 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)?


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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 cente4y,3hisssphe27r3g e np)oc9 r of gravity is equidistant from the sides7s 3ry)39p se nc2ospeh, h4ig, and positioned 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 7.0 m in diameter. The top de429qbi6b84dcz)j ihc8xznk5 efk . is 4.5 m off center. How much farther can it lean before it becomz9zb8efb idxckd6 5 hjec4)4ik8 n2.qes 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 muckt0wg)xhatdt)s0fw p4n) 7d ;h force would be needed todnpa;t0 t )w4 sk07)wg)tdh xf 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-sectionaljge48)w 9v4ex2e 9 .fcgs mqyc 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 station is 4.0 m lu1h.s3;:ceg3ftla m plm h) (qong and 0.20 m in diameter. Young's modulus for f)tma l h : 3.1gspl(q3hm;ecusteel 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 6.28u- 5rfw.pawn 1hm(9t c-N force is applied. What is the elastic modulus t1f mnw5rh9 c.-wup(aof 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 diamety( nyz4 fnrcru.q. rrj9 c//wbnp9,f(er 1.0 mm and length 11.2 m. How muz.(u(prb/njc/w rf 94rc nrf,n9q.yych will the wire stretch? The 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 walking on crutocf(k 99ux/qn00b id cches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What prebdixcco/09u( 9 fqk 0nssure 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 a9fu,t)s ty,h k(k5k tnn area of $1.250 \; m^{2}$. 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 10 fe1 knu( m+*kl0i-lvz+ qdt*g.0-kg mass. What is the stress in the wire? (The Youngi* zkn-qel+l1 ktguf(d+*m0v '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 supports a 10.0-k(jg( ln *9lfhpg mass. What is the elongation of tfph9l(nj(g*l he wire? (The Young'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 ilafiu6ti 0 4so61j:202td beqvp3qocs applied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for alumin602da: t4 2tbp0 1jv3ifcqi6ql seououm 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 pressure has increased (-tik;5wc wy dby 100 atmospheres;k5iwywct(- d (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 strenc of.71xcfszje3o+ ,ogth of steel is z7s +fcx e.3c ojof1o,$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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