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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 co1ol1t75n ; n1ezeqydj nditions 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 conditions are necessary for static equilib1z;r,zk rd93zl cycsyh bm47,rium?

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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;i4xa.e uo t+u head the net force on the book iso; 4tie xau+.u

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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 velom xyg;dgb51boffar )f2m o8 3.city of 9.8 m/s. What net fo2g1baxrybm 8.ff) od 35fmgo;rce 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 rz,w6j ,dxkr** zdj9 lwith one foot on each of two bathroom scales. Which statement is definitely trujkd jl, r r*,*z96xdwze?

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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 lightn* (/0 bbcfljc girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, clbjf/* ( nc0bwhat 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 smallwyz2a* w vnn.*-60qpslpby2 w e ur)-e*q;eeg 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 horiif;t0np fmm 8u+4x s/gzontal 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 10tr fd22nq)2nmdiw:w scmf8q1d ,rqbu*ln 1-:.0 cm x 6.0 cm. One is stacked on the other, and the combination is then placed so that they project out ov8t)urdnlq f,ww12:qs -dqf2 cn rb 2nd *im1m:er 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 suppo 4z +2rjw.1hs fxuhoi9rted by three legs placed equal distances apart on the edge. What minimum mass, pla +1hw xusrz9 j.hoi24fced 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 ou/tzgyy .a xtr+. g2aeo gu/6ohy7*n3f aluminum, brass, copper, and steel. Which wirn 7t grae3y t6/ogh.2o+/ayyug . xzu*e 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 whenagm .g 6t(k7gn.rax:h(n+ z ri subjected to minimum tension of 36 N. If the wire diameter were half as great, we woul(tahrr:.ix( ngg7ma g 6+n.zk d 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 buttressinard fi5kk)1 v2g force at the base of a pointed arch ki1) drv52ka fis

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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 frv17 ks.y 2dnwuxnqkek*l i7-(om the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on tqki27*kudl w( .v1ys-nxken7he 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 to23f mk ou.xlp,ts( -ml the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on thptom.(sl- fl2x,mu 3ke 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 maivgoq g2 h-b2yhks8+)ssless 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 other si)bo -ih 2hk8y 2qsvg+gde?

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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 the cesih m,,pm;s-d4* hg cfnter. 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 balancch;-smhfs *g,,imp 4 de?

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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 ii8v+*5i )l2f wthqr j i5n ylf;0,d+pw+sv fuweighing 500 N and 350 N, respectively. If the supporti5 * ,djyrw+) wflu q+t+ihnvfs5iv0;p2l8fi 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 64y(jsh 4,pqwnfu;e ,cd5j ef ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what iscy( e6u dqjf,h4sew;,f4 p5jn 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. f+ 7uu bixe(9aIf a 400-N person sits at 2.0 m from the left end of the beam, what is the tension f(7bi+9xauu ein 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 heldzt,.2 ;eg s+tbhdbls1 up by a wire at each end. The scaffold is 12 m long. eztd+b ;hb2l .,ts sg1A 300-N box sits 4.0 m from 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. The scaffold is 18 r.dd,zthr fiyg e76ln6h.h 3(m long. A 650-N box (rhtn6e h lyd637d,gzri. .h fsits
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 ybjk;1 0 emt3aat 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 aetam0b ;jk 1y3 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 1be(;rs 2 l)b asvvik4(jc8*ix00 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 end, how far from thesjvxi4r2b; *8kve (a si(lbc) 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 separp o6+rcm z8+jpated 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. A 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 person8rocpj +p+6 zm'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 ar,f g3)wf/ ion4i4qhsme separated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0 m below horizontal. Assuming the wir,m4fi4w /nigo fh) s3qe 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 cm from the elbow-ea;l+.rgvp; g ;m5kc; asn ln)joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot puea)kggml n +;nsv;.pc r5a;l ;t (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 gra bhn5b0z 2t(fgvity is equidi025gtf( bbnhz stant from the sides, 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 Piym,s f-60+b2g8wj/gbq t u ticsa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it b8c -2qb/6+ w utfgy jigtm0,bsecomes 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 wouldl rez 8q1nw,xea c/mvgqye;m7w9 7/ u; be needed to compress the block by 0.0125 cm?/y9,; muez8eg;e m1 v qq/ x7lr7wcnwa

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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)0jboqa t q;l6t5nod5 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 t xuww;xiltd4 /:4f*x a service station is 4.0 m long and 0.20 m in diameter. Yw*;4tutx:xd wxl4f i/ oung's modulus 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-N t1fnd( . vjh 7lm)1b(gy az)srforce is applied. What is the elastic modulus of the wirlfgnt) a(r7 ym1vdz (s)b1j.he?

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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 susw3nsogm a); 5npended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? ngm o);3 ns5waThe 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 all his weight on the9h7fkp lb-qb0t:* q sp two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted7 q0qh:stpfb -*k 9bpl 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 :s 9t78cuvqfx$1.250 \; m^{2}$. 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 wdlqu/+vepd0tp,un :voi f 7 fs,h*-. m in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Yo-tupshd fq/e,o. ,l*u:+0ndiv pv w f7ung'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 leng3 usk2v zq52(tvjhm, eth and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminztk(u,2sv 5 je3vq mh2um 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 aluminum c byce2g nz0d 60gw d2*8c+e9y.usctkz ube with sides of 30 cm. Whkg*+ cg820wz0 9sdy6yun2c dez ebtc.at 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 increaselli rj6hl2( 0kb0 6a4x3 jglhrd by 100 atmosphereh j0b6(x 0li2 ll4largjk3hr6 s (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 hab 8ka+5gd;8lqf)kagl 1 lm8z vs a diameter of 30 cm. The compressive strength of steel is abf8+m5l8gkzl8gdvl ) q 1;ka $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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