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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 63，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test63.html  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。
 作者: physics    总分: 44分  得分: _____________

答题人: 游客未登录  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 eq512ulf pasya/ uilibrium?

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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 equilibriumpp*h mlm (;dp-?

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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 ekppi jp5g1 ls;kv3d+5//r t ithe net force on the book is/3 /pgij5tds1ie5vkp +rlk ;p

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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 oln8 4:m 4q6yae ikx3hmuter space with a constant velocity of 9.8 m/s. What net force acts on it? 6ki4: 3nx hmamlq8y4e

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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 sql w*a-i aam2/tands with one foot on each of two bathroom scales. Which statement isaqal* wi-2a/ m 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. osq349 mm.bi c1g :h)g:emv ouIf they both move forward so that they are one-half their original distance from the pivot point, what will happen to the s 9hmcbq3v1.ei4 )sgu: o :ogmmeesaw?

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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 smallt5f-8wk 24joii opwx/ dq/ws1 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 horizontal tap0 fj ak,is2c:bletop 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 1x;vr4wr9jts+ 0.0 cm x 6.0 cm. One is stacked on the other, and the combination is then placed so that tsxrv9+ ;r 4wjthey 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 equjq8zcla b7 s6*al distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will ca *sc6qaljb78 zuse 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 wirzw3 s5bh*eti 5gb,7s+vtv5 efes made of aluminum, brass, copper, and steel. Which wire will stretch the lts5 +53 fzt*h5gibswveve,b7east?

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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 tension of 36 N. p0/ v-mqlhy -kvd;l6,kh4r p xIf the wire diameter were half as great, wevxq- ;6d-kprh,4y k/0vhml p l 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,(ni )n hi7erd a pointed arch is enr7( ih)in,d

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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 t0ef9jkj od/85c97hx sr z7bsqwm8v3j he weight to be lifted is 1.0 m. If a worker pushes on the opposite end witvs7988 xs j50o9bfk r/czm7e3wj hdqjh 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. : ct/hdxs:tt aiuu,/ ;The distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much forti/hs:;a:u xuct t,d/ce 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 balanced on a massless seesaw. The boy hasb3 vq1w:z83b (lmc5m e.-l3lw 4r qq u6hxcers a mass of 75 kg and the girl's mass is 50 kg. Iflsmw34lq(rc: x31urbqmlb q6z3 8cwhe5ve.- 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 the1lql7rbrd ek/1fb6 :i 5ml/,wood1cd center. Child A has d/ 15 d1cro7fl,rblk/e1mwb:qd6lo imass 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 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 twol 3zvdnqa/o* / children weighing 500 N and 350 N, respectively. If the 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 tzo//lnavq * 3dhe 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 ii5 6l-(nv* jzsim1 mqxs supported by two ropes at the ends. If a 400-N person si zn-1v *mj6isi5xml q(ts 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 w 5 ;(dhh1 )azyjhq3moleight 100 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 beam, what i y1j5)hqhh;am lod(3zs 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 6dml5 rv l a;+u;po*0zbxam l1held up by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in eacva0dx l6r* mzpo+; amll;u5b1 h 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;c*/zqvmlf *; yby(o :r0qbiw end. The scaffold is 18 m long. A 650-N box sits c(bzy vy0 f;qi:l*ow b;m*/rq
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 supporte *a5m99tj koxes(k5nt d by a knife 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, respeck9(*95ex tkjo ta5sm ntively. 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 weight 100 N and lengtmkc:g3.0tnldh fajv 8o 02kd4h 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 ff0.k:803gtlchddmjok 2 4n avar 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 separate75 qugws;nyoz-mc: +wd 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 person's center of gravity zy :m ouw ;nc7+s5q-gwlocated?

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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 s:caehpv 78tc 8eparated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, caustvph: c788 eacing 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 its5m g rggpqh6p(nv;l1iqv n n(6ii6(t7 CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm r6lh 1p6q(givqntnp;v(5gm( ig6n 7 ito 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 gravity k * g yei0d9wls*a0rn0is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which it can be incl9 wd ye0sair0*n*0g klined 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 irx 9c gv8/g1ain diameter. The top is 4.5 m off center. How much farther can it leangrg1/ia9c 8x v 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. c;ku9vi(;gw7i2rj ah 0025 cm. How much force would be needed to compress the block byvji(2hak9g;i;w c u r7 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 7)mecn q5:xfaarea 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 azmrq) l5fg7v0g+ 3b ra service station is 4.0 m long and 0.20 m in diameter. Young's modulus for l 03bqva5gz )g7r+rf msteel 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.sufnwt h1ca5l3e7c )s )o)e l;20 mm stretches by 0.20% when a 6.28-N force is applied. What is the elastic modulus of sce )neta)7c) lol5fw u;3s 1hthe 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 lengthpzf ymgb04 ad9j6t2w* 11.2 m. How much w602gjm dwp 9atfzb4* yill 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 onjnthj ,;-6gj b the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is ex,-bj jh;6nt jgerted 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 are wa;:b1vjd(aq a 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 6c5 ch,) lxd,v/ul/zlqvvdv0 diameter supports a 10.0-kg mass. What is the stress in the wire? qc)/v,vvxdl,6 ulhzc5/ vl d0(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 adq0b (z+e3/ *zyeb jhe 10.0-kg mass. Wha+zde0( ej yz/b h*3qbet 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 appliedda7d+s gk, *ht to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for alg+ta* hk7sd ,duminum 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 ifhd0a4 ,e8b w100 atmospheres (to abo8adwe,0 ib4hfut $10^7 \; N/m^2$). 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 compres*1w);i nebov32r 5/fluzc1p lcip i9wsive strength of steel iscl*wuf1nv 9)p 2pr5 1coiwb iz/eil ;3 $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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