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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 necec.:xnntmf20 rzr1 pg:ssary 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 conditions are necessary for static equi- m-pe yo6jqho2msqhc.u82 0o librium?

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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 th ged3,k+g ; o:y3vgsqse net force on the book i,soqgvyg3k d:g;3s +es

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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 velz50*zkvnpg, 5yx (vdqocity of 9.8 m/s. What net force acts on itz0,*kd q5znvv(yxp g5?

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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;yx58l cgr 9fo one foot on each of two bathroom scales. Which statemenfx rcly5o98;g t 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 mfum(ghx0y* 4hs0nwe)assless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will hsx y)0 m*u0h fg(4nwheappen 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 e 25ozr(j9p ehand 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 isrc) txek 6,r 3v9cnttke4)) l6ktb6qh 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 9+iy( pd7uq1gq qh8ab( h tv4tcm. One is stackdqbpv1 hy+qt(4a h 9gu7(itq8ed 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 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 supporti7xhjn ;(pr kbmq.d)*ed by three legs placed equal distances apart on the edge. What mrn k x*7 ;(h)iqb.mpjdinimum 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 w:u/bkp+ z plc(ires made of aluminum, brass, copper, and steel. Whpk :(uc/p+l bzich wire will 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 v c0b aim2zu+u1 llp+n-(tuv2 tension of 36 N. If the wire diameter were half as great, we would expect the wire tm2-cl vlti2u ( n+bv0auuz1+ po 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 buttressing fork.gpt f lmd.e;r/ ;a4mce at the base of a pointed arch irp; da4t; el/ f.gm.kms

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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 longpd*c1r -n6qoe o 7shu:h mu9b.lunx,3. The distance from the fulcrum to the weight to be lifted 1pencuxhsh -: *u7.9mou l3 6qb,d noris 1.0 m. If a worker 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 fulcrum to tmoea(rq,n e):c8q42hi 0z a:us s.qyshe weight to be lifted is 1.0 m. If a 3000 N rock is to be lif,.qe r8:yu zcamosisn0aq4): e( 2hsqted, 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 bal a tr*pri6nx;r267vnsanced on a massless seesaw. The boy has a mass of 75 kg and the girl's masnrx2r*n 6ir 6 v;7tpsas 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 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 t6ig e0e03mqpwhich pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 4000gi6epmq t e3 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 N supports two children3bw059 q ipphk weighing 500 N and 350 N, respectively. If the03 5wpibh qk9p 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 supported by two ropes at the ends. If abw)tv*0:lhy z 400-N person vy0bw* l)z:thsits 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 two ropes at the ends. Ifvfw 3zrv5bv58v2 1rv-ui sc7b a 400-N person zfr8 rvw3vbvbi cu v1sv52-75sits at 2.0 m from the left end of the beam, what is the tension 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 endoi1)poha+h8 p*j-aiv . The scaffold is 12 m long. A 300-N box sits 4.0 m frpo *ii+-1vo)a8h pjhaom 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 each end. sz pa)o;4cw;* lu9*e5 3:cvwcm q6e xmw 3ecuf The scaffold is 18 m long. mvzp)e*6ae3fu4 m9c;5 xl w;3cc*cwewuqso :A 650-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 knife edge at the 50-cm mark andgea +2ruu5 pk1 has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. Where (at what mauu pge25+kr1ark) 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 o 5rzalj9-t4( :0r-:cy kjvnqr 4est xhf weight 100 N and length 8.0 m. The board is suppo9-v-tk 0scyt rxrrjl:z :qj4n eh(4a5rted 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 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 2.0u+ y.hhsp7w y4h8 btt;0 m, and 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 lef+wb ;ytt 7p yuhh4.s8ht 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 wire4 yu 0diprt *iiu;uc,). A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sa)u*i it0ur ,; u4dicpyg 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 and its CG is 12 cmc9. 67r g-uxhju;*8nj:apgan; i htzh from the elbow-joint pna-nx;ih7u pzc 8j.t *;ujhgg:69ahrivot, 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 center of gra6sz )u)t ttw,bvity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which it can be inclined without tt)6wb t,us)ztipping 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.kk 2zru 1fw:jeofwnh,/n d)4, pg()6av 8mstk0 m in diameter. The top is 4.5 mejv8a,) tk fsowzr/g p6dnnkhm4): w1 2u ,(fk off 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 0.0025 cm. How much force would be nhjb;f;vsg9( m3 n:chneeded to coh 3 cj (;;nhnv9g:fsmbmpress 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-sectional acs/4 k)vxqinhmjd2 zz sy/ 8mwzy a79o 5)ci)1rea 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 statio is5 (qj)v.e b gwule2ag;lim0+6vnh.n is 4.0 m long and 0.20 m in diameter. Young's modulu.nsvg w(j ga2evqiiu)h;ml56lb0+. e s 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?

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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-m8 afcbi3o)y 6N force is applied. What is the elastic modulus )ay36cf mob8i 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 susp) ngi uk5ip5yzt* h84lended from a steel wire of diameter 1.0 mm and length 11.2 m. Ho kl*4tzyip8nu h 55)giw much 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 crutches supports al-apk s v-1f6kbl his weight on the two crutch tips, each of whic-vap6b 1-k ksfh 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 of kkz2l7oe bl6i6rassx/z,8yuo:o a-1 $1.250 \; m^{2}$. 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 supp zwxax.z5); qxorts a 10.0-kg mass. What is ta wxzx.)5 xzq;he stress 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 o mwlp11u5jw52.0 mm in diameter supports a 10.0-kg mass. What is the elongation5uw11m lwpoj5 of the 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 is(he 8fgm lunx/ycc997l 5lb/l applied to one face of an aluminum cube with sides of 30 cm. l9/clf/ (u7m58eyhb nlgl9cxWhat is the resulting relative displacement? (The shear modulus 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 pressure has i78mlbp.:g1 f/gv xlgxlt 0hi -ncreased by 100 atmospheres (togg hf 1g/mlv0l ix:xb.- tlp78 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. p m(ffdt)z,qn h7t98r The compressive strength of steel isf 79dnfz8)(rt ,mq pht $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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