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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://autodiscover.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://autodiscover.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 equilitfb vc09f lv91brium?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What condition or conditio(eghxpj-rm goro xg* k*n19-*ns are necessary 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 rnphnc h(fll5* 4a*d 9cest above your head the net force on the book i9al* 4nfd5l*n p chch(s

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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 constaz -6t wfahv)s/nt velocity of 9.8 m/s. What net force acts onzfh)/st -av6 w 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 with one foot on each oy sgj+fgz/50idns/ 6cf two bathroom scales. Which statement is definiti 0fsc gn/ys zd+jg5/6ely 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 gwj6 m:d8jp s1zirl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance frw6 jj :dsp8zm1om 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 small e .uwp-juelx5 80a;y xynd 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 horizontk:vk0(-o s 6fnogj el1al 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 cn928hpyapdldbu h fg .g7 9s4-m x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is ty8f.d9ngd spl 4 h-9buahg7 p2hen 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 equal distla :lmocmv( vk1 w2)t*ances apart on the edge. What minimum mass, placed in the middle between two sumk)l 1(vwltc*am:2 o vpports 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 wires0 s ni:eer);gh ha6 cmkeb.4p8fyk g41 made of aluminum, brass, copper, and steel. Which wire will 8a.mhy:4 ;6scihp eg0n)rbkgk1ef 4estretch 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 tension of ,*i8aa0s1fo. pmoe cw36 N. If the wire diameter were half as great, we would expect the wire tow0o acao,fm1 *pe8 .si 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 forc38dl lhhp g7-ve at the base of a pointed arch ish-l7ldh 8gp v3

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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 .:p bx2-cu,-zem u gvvxpc4q5 distance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on,v-up2cpu- 4m x5v .qex:zcgb 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 ful s* amkp y7bt(5kiq/s.lh/9odcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force mmly/obaip/ *(5t7q9k kh. d ssust 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 see wl):gqea)1*mrp0i nv1f) (th uv3iu isaw. 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 seesain* )qwputv1:) g(1ei3huf)m 0ivlraw, 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 th 6o1kf/aki7tzt1r:eiek: ur +ocae*/ e center. Child Aakz:r1eo ei u*ai/7ft1+ kt/o6crk:e 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 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 500 N and qos ws8s5x6p*350 N, respectively. If the support is at the center of the 5pw6 ssxqs 8o*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 tw67ch3q wvy4hqo ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in t3cq 6h4hvq7y whe 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 rope 7ym.1e8j-lk 7) u.dlplia ymhs at 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 righh )ai jeu lm7-17plyml k.y8.dt 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 encj g: h(2aa+vcd. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in each a:cgc 2v+a(jhwire?

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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 w3audw 02loww0 qr)j* at each end. The scaffold is 18 m long. A 650-N bow*w r 2ow0j)wd0ql3uax 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 fu enb85,w k nd09 1iea.4cvqrthe 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 hung to keep the stick if5 in,d4ck naq wre01e. 9b8vun 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 length 8.0b1n : kqq lq xvcbt6v00kubx0mu+(3n3 m. The board is supported at each end. If3x bc v0n+vnbq0(1 b6lux qtuk3kmq:0 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 s,yipi0nu ; 5p2.00 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 pyinui,s0p5 ; 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 sem eepy f+;i)o0parated 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 wir)+epieo; 0 myfe 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 ar:ps *2t c f4ttplc1b0om has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much forcetl:bot2tcf 0c1psp4* 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 :kentt8,pzw 1,u lg) hwidth of 2.00 m. Its center of gravity is eqn, eg,:wktzth 8l1)puuidistant 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 Pisa is 55 m tall and about 7.0 m in diameter. Th 5oxo8 (t.dstve top is 4.5 m off center. How much farther can it lean before it becomes unsta.v5d(s 8tto xoble?

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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 b,rw+ sm)ip jzx id6zw **k7r /:hid)ou0: yccle needed to compu*7)rdhkx 0wiz, ciz p:do*s:jlrw)y m+ i/c 6ress 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 crosssz20 zb,vk ez9 f uu);140lzbr1 f7x:lgbevsp-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 in diameter. Yj7rhv4 2d(n ssoung's modulus for stv 2ss4 nhdr7j(eel 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 /do rxtejr7sn jqf1 7974wx.d by 0.20% when a 6.28-N force is applied. What is the elastic tj9w471 7frnxo/ds7ex. jqrdmodulus 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 suspeg)wwj9w+n:v * pvf00 cqc8qzi(p d ao8nded from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire00 d:*vzp ap)(f wqn8vw+8i9qw cjogc 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 personaz. nyu ftc+,* walking on crutches supports all his weight on the two crutch tips, e ,zt cn.y+u*faach 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 an are/sh8b nn 96bog:v9jkha 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 diamvs/- xwcrc 23weter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for al/-vc3 xsr2cw wuminum 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 1e(vfs xup k,:v/7nh ;af*v fwmass. What is the elongation of the wire? (The Young's mfh/f ;paeu1wvv7f,k( vs *n:xodulus 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 aluminum c poin/i1af 9kmf tb,37ube with sides of 30 cm. What is the resulting relative displacement? (The shear modu, fp i/ib7mt9fn3 k1aolus 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 so raa*-:b+z, oywasg 4ea the pressure has increased by 100 atmospheres (toaaay o+ r:b* ,s4wgz-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 diameter of 30 cm. The compressive strength of steel is 0,1 s-s aewkt04rkmup mk s4s,waetr 1u -p0k0$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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