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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test63.html
 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 conditions are necessary for rotational equhv b; spyw2y1(ilibrium?

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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 necegmnx 3(1ll+zvsbr7 a: xc)(tissary 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 heloaz wp3 x,bc kxh1m5tkf; j(nw/5s,0 jd at rest above your head the net force on the book tw 5x,x(pbc ;5m h3kzjwa/jf ,kn1 0osis

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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 witcg-o/qfprun hg) o3/1 h a constant velocity of 9.8 m/s. What net force acts on it?) 1 qhnuf//r-gop3ocg

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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*doy (6 krdftt e73,xz52kygm N stands with one foot on each of two bathroom scales. Which statement is definit (o td6tmfre3 ,zy k2yd75*xgkely 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 masslev9:::l wumrqjb rue(e0 vf0 /dss seesaw. If they both move forward so that they are one-half their originald 9/0wev0e(r:jmlb fqu u:rv: 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 its smallc nduyhuyk43.h;/ga 9 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 horizonte 9uinq22 xxx 6: aub0dyk1*jxal 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 cm.mqfh :.t4/v xq 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 distancq4/xhf vt: q.me 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 support0sm.jk85pjd ced by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will causkj5 pmcd.8j0se 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 w3mf q bg29mi2zires made of aluminum, brass, copper, and steel. Which wire will stretch theiq3zmb29 2fm g 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 1 w2eoux/za+dvz :f1rn-2a x dbreak when subjected to minimum tension of 36 N. If the wire diamet1ozaxned/ :r1 2w -ufd2 xa+vzer 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 buttressing force at the base 9 qz-axukclu2 jj /7o)of a pointed arch acju-x k /j9uq7z l2o)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 (rkybmyc7;xvoa6j * 9ms8 dw-weight to be lifted is 1.0 m. If a worker pushes on the opposite endr; 9yvkdswac-86y(7m ojx* b m 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 dlvh txvkp j;e0, 42gu8istance from 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 on e2,x4upgklv0j v;8th 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 seesaw. The boy has a pz65zllcs8y-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 sip65c- ys l8zlzde?

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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 seo4w;)-w twm fw ,hau,iesaw 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 th4 )im;wwao, uwh-tw f,e 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 children weighing 500t,5 .;v l: 82velnhxua )zhlam N and 350 N, respectively. If th:) lthl.a8e 5lxavvh;, 2nzume 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 10+7 ch2vqpdj o a8g q9(btxnk )nhq3p:oz(j/p*0 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 beamg8 o 7 hq(pqdp3 z/ hoja2:9cq(pvx*bnn t+k)j, 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. If amn4m.4 l,m:yb2 o0wcn lgtw3 f 400-N person sits at 2.0 m from the le4nncb:ow m.f43yw l0m l,gm2 tft 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 end. The scy;* tqa3n0vbn ; rjmwzi5 sb53lxew9;affold is 12 m long. A 300-N box sits 4.0 m fro5n w3 em yz; raq3t0;bwv*;xsilb 5n9jm 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 wir hdoe:uyizk6 (8ktuf:o, cb*.e at each end. The scaffold is 18 m long. A 6z u8:o uekt:io,hb*.c6yk(f d50-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 knife08l xnk sl-fv7i:q8 eb edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at tlkbxvl8i- s:e 8n7qf0he 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 wk* e+mckc to* .y+0:ylw(sxxheight 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 end, how far from the right eo s*( 0ycx:kc mlehx++y.k* twnd 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, au-fytlc51l m6 yw, be2nd 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 whicwb 1m5yc,ll ty2e-f 6uh the right 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 connected by a wir(maqu(3qgvy(6,b -nsfcr f7u e. A bird of mass 0.50 kg lands on the wire midway besrf, (3cmqynqgv((7-ufa 6ubtween 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 and its CG is 12 cm fro5ko4qs;q9q8 5tmi smca*,pxy m the elbow-joint pivot, how much force must the extensor muscle in the upper ar m 5,q*94asqpq5kxcm8s y i;tom 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 ct)fbnpp399 e xv +p6 hyqzv.u4enter of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which it cayp .uvpz 3 9vte9p)xfh4nqb+6n 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.3ya ywzj1e8)w The top is 4.5 m off center. How much farther can it lean before it become )1yza8e3wjwy s 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 0.0025s ut5,re*ca,2xxo,u9 l8z zni cm. How much force would be needed to compress the block by 0.0125,ez rtx2l, nx 9o5*z a,ciusu8 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-sectio*; xp e3w2ce apaagi)7e5ya5h nal 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 longasp,qh *oh3bzg1a g;b *jdx 89 and 0.20 m in diameter. Young's modulus fobhsh p* *g38a d9gjxqa 1b,;zor 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 stret 5wg6ng7l8n- j u-hkc:abu f2lches by 0.20% when a 6.28-N force is applied. Wnkla8-f5w7uju hbgl 2 gn-6c:hat 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 diameter 1.0 mm and length 1t3cn ,jkerhmtw: j992 1.2 m. Hhtcj29n,r3:mkw 9t e jow 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 all his weight on w zmz5e25rgnnp5f9 hs8 v 87.tlr,tru the two crutch tips,8 5ls5r.7,rthpw5zmrzeu2 9ng8vftn 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 anc qkg lb/bs0.+ 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 len4s xf qmcmw)f/aj *+(ogth and 2.0 mm in diameter supports a 10.0-kg mass. Woff 4 (+aqs)m /wjcm*xhat is the 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 2.0 mm in diameter supports a 10.0-kg mass. vewpex;(o-as 557hj v What is the elongation of the wire? (The Young's modulus for an aluminum iwjep e oxahs-(v;755v s $7.0 \times 10^{10} \; N/m^2$)

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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 alu jm8. -(sgqdzqb 89/xvahlr2nd (ay2 yminum cube with sides of 30z l/9d-nasrb.2j( 8yvxgay8 d(2q mqh cm. What 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 increased by 100 at,+tc( ,j xdt y-pg8rrtmosphere x+tc,tgjr8p ,d- y(rts (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 pafin6 f3qcd 2;l+pn) strength of steel is pi36d 2ff+pnn;l cq)a$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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