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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 foi1udjz 66r: i/:dt i ttf;m0dw2tlo l1r 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 nems 2+ h.emlerz(ruhos 1p);-xcessary 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 held at rest above your head the net force on the book /-v f3xz xwmaa5sqwxl1 f27xfh9 91q tiwq xa1whqfs9ztf3mx-1 5xlx7/ a2f9vs

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rocket moves throughc m bx;l+e.3 sevvde9- outer space with a constant velocity of 9.8 m/s. What net force acts onxcsleb9e +-;v3 dvem. 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 800cltft0o0b a k+9 ocl,* N stands with one foot on each of two bathroom scales. Which statement is definitely trul,*t+ob cta o90fcl k0e?

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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 girln1hg 634 olpji are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what wilihj16pgn l3o4 l 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 en i 10)p9zryve ybbkyr2vm:4*md 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 tableto t9yya39k)om wp 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 ofpqj jqu,z/g4 : dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other,p uzq: qjg/j4, 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 supported by three legs placed.-dab 6wqhga+ or **gso,i6jo equal distances apart on the edge. What minimum mass, placed in the m,+qo * io6o.j* 6rw dha-agbgsiddle 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 aluminum, bq435cxsg aek6yqc6+q ;vi7i vrass, copper, and steel. Which wire will stretxag;vk6q 4 ccq73+s5qe 6 iivych 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 whenug(t pgoflzqn- 5wg ( 9,46oph subjected to minimum tension of 36 N. If the wire diameter were half as great,hztfo poqg,(-6(w 945 glnu pg 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 of bjl58p,pqw( t a pointed arch iqwl8t(j bp5, ps

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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 be lift zh6v .jsp* 5rr)0/cf(btre aaed is 1.0 m. If a worker pushes on the opposite sre b/hpcv0a .5 6rj(z a*tf)rend 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 fs , hze.veqbn2zp41., iry*xdt2nf9from 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 9qn.pfz.y1 zxtehds, fevi22,rb * 4n 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 balanced on a massless seejtozmiyd;vsfu2)3:i /b79u s saw. The boy has a mass of 75 kg and the girl's mass is 52vbom3:tjiuis uy )f/ 9dsz;7 0 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 which pivots in the 6.t2t uk-tpko center. Child A has mass 60 kg and sits 2.-2kpo.ut 6tkt0 m from the center. Child B has mass 40 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 children weighin(gjc wwuj+gjocq )40*rjc5 +gg 500 N and 350 N, respectively. If the suppg* g +ujcjjr 5g+oc qw4c(w0)jort 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 endsai;c 7yn(4n 7gnmc9ki+f) gfsk;t0 wj. If a 400-N person sits at 2.0 m from the y+ 7jfngfi)na;c ;w0(ms9i kg t4 kn7cleft 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 a5 ah yhdp 4oe90*weetf ms718ot the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in the right rop9am07ew* o5184d hfeshteo ype?

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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 hel hz ds- nu3j.e4(u;j1hcp(uezd up by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the (u j1ed3zju-scz e(;hp4hn .uleft 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 bgl6evg4l6alx vw.d ;2y a wire at each end. The scaffold is 18 m long. A 65l;.6x4 gl w2ldg6v aev0-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 knifeksgf. z,wy) q0:f ,np5 xcq)yq 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 0.30 kg be hgz,cxqny,k : f 0q)5fp.wqy)s ung 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 100 N and lengthn3 r0qwv/m*gl -j z4sikk58f q 8.0 m. The board is supported at each end. If the supporifzqgj0s / 8qrklm 35nkv -w4*t 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 2.00 m, and a plank of mass 4.00 kg is plagq8m +athugzu ed8 ,57ced between them. Each scale is observed to read 2.00 kg. A person now lies on the m5gq88gt,az7 uh e+duplank, 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 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- r0blyrlgtuea5x-5 / connected by a wire. A bird of mass 0.50 kg lands on b-/urr0ly5 te5g al-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 arm has a maqa6 7ut, z,. pmek1 6qcg5hljxss of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, zgexjqtmk l6 c, q16uah57,p.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 baacgh ufe)*0ux ecbvl5e)d6: (se width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angl5(*u6uc:)egcx bhed afe0)vle 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 an9w11*j0vfxm epgv2jbyg6p+s d about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean befor2v9+v x pf0gpyw1 *1g6smjjebe 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 stdf 8j;wzdz l6 b7o)a tqwh88.1w5mu pbeel block by 0.0025 cm. How much force would be needed to compress wub ohfj.bw 81m8 q;d adzzl87p6)wt5the 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-/zq bzi): z+ wuyio,m a 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 station is 4.0 m long and 0.20 m iqrs5d8qqc;e5dtmv 1 vw/ l 6c6n diameter. Young's modulus forr cv1cqv/8e 56 dlm; swq65tqd 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 e /qc+-m bmqe.6.28-N force is applied. What is the elastic modulus of the wirec eq+mqe/ b-.m?

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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 111eh:1d3cvr d/w )wppu .2 m. How much will the wire stretch? The Y p: d3v w11pdw/hec)uroung'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 thgy:s wws3lt5o ff4ro f8xp+ 70z (2otne two crutch tips, each of wh otgo8fyf3+pxw:w4szf0o s57trnl2( ich 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 areahr 2y h;yc7yi: ngu3 zabk;iy4bh;7g: 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 b bnhn/ y11)rga(371 gg deiersupports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminu n)/e ibrn3hg yd1g1 (eba7g1rm 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 suppor,tefjldjb.7 f h1i3j*ts a 10.0-kg mass.jth ff*jieb3,7l .d j1 What is the elongation 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 applied to one face of an alumiac-jd7l55e(at c, n+ + aizaucnum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for aluac7ia z5 +- alnte,+caj 5d(ucminum 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 1o q oa:ljgs0ld4h)fg s.v+j2;030 m in the sea the pressure has increased by 100 atmospheres (to:jvdf 2sgs jl4a).+qh;gl0o o 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 diame:,/l-hl1a ejz8b rm/:w brwog ter of 30 cm. The compressive strength of steel is e1gjb :rh wo- a, br:l//lzmw8$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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