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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 equilibriu,r.5 gynv2ladkmy- r0g+ bus7m?

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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 ar -ts1o rvq9*jfe 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 rest above your head the l8v2jz:auz ,npvt9 *unet force on the book i *a ,tzuj:8pz9nluv2 vs

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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 ou y zs-bo+o0x) x*sbts)ter space with a constant velocity of 9.8 m/s. What net force acts too sbxbs0) +-yzxs*)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 with one foot on eacu t;vinb1q;(o jj0 x/p5q xvrip1z:7ah of two bathroom scales. Which u( zo 1qt vqxv1rbix :ni7j/ jp;p;a50statement is 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 li:c .oxfs* x3d kref8a7)uja.jght girl are balanced on a massless seesaw. If they both move forward so that they are one-half their origx:rk.s ojfau *x37.dj8 cfe )ainal 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 small end 6z +7 zg3mx +ton k.qfxu6cwn3is 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 tabletor: u9 qs3kwqb,p 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 5amggb /hw/6t -l ql5hdimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination qg/l 6 mwthb -5ag/hl5is 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 placukqt24mreew b uy*9 29ed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table'kque 92 yume2 *rw4b9ts 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, brass, copper, and steel. is h14;(kxc cu77gzvct57gm r+ u w,ac Which wire will stretch ct( ;a 4xc,hvc7zg7u7kgm siwr1+5u cthe 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 te o2y l 4m)uenig+/k5aonsion of 36 N. If the wire diameter wermug4kie )onl 5o /2+aye 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 buttressi1az;9xytp t x n04p-rhng force at the base of a pointed arch ixpy xh art091tzpn;4-s

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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 tx vy0g 2szxvlf9j c() 1:lo;mwo be lifted is 1.0 m. If a worker pushes on the opposite end wif x:)cl1wjg9ovz;x (vslym 02th 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 tq9jgb l+lti s7z 8oa l-w;5.yhhe fulcrum to the weight to be lifted is 1.lht l9s+gz75 wjboa .8ilqy-;0 m. If a 3000 N rock is to be lifted, how much force 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 m df:go .zhb/hul/u)o*assless 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 oto* /.o)hdhuzf:blgu / her 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 un9mt 5 3zubo+*h qtq9nkp),jzhlmu h/5iform seesaw 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 the center must child B9 /q,h) ozn+hktt lmhm zu35upb*5qj9 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 4b 83uk*8pq1sgtgc noc .ze2( u0 N supports two 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 *g 8b2un.uc sg cqezkp(t81o3 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-legbh 8b33bgv r0mr3 by two 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 the lm3 bvr bg-l3eb38grh0eft 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 end/0q-xjh-wksc s. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in--s j0/h cqwxk 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 scafq(+p+5wrpfkl )9ds-ekadv lrr (5 pk*fold is 12 m long. A 300-N box sits 4.0 m from the left end. What sr rrkdek5 -+(*l v)fwp kd5q(pl+ap9is 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 zg6 zwm(mjlv -;fr d/-3spcq-is 18 m long. A 650-N /wg d- jr 63mzlzs( cv;m-p-fqbox 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 the 50-cm mark and has m apbbhnu2h45 o*1e wf- d27zeuasses of 0.40 kg and u doubp7-54ae1 e h22 *bwzfnh0.60 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 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 boardfbw-3; 1 w ti+jaqy-cn of weight 100 N and length 8.0 m. The board is supported at each end. If the support force -cbty i3nq; w1f+-ajw 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 placed betw :5mx* olhz5vpeen 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 mphv5*5x l:ozscale 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 wire. Aa c*t mxg:/w5h 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 wire has negligible mass, what is the tension inc5 /tam :wx*hg 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 aqub3irt p dq97/alc )-nd its CG is 12 cm from the elbow-joint /cr3-pu 9qq)li bdat7pivot, 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 base width of 2.00 mnn6wpuz-msrm uswu t3;/5 t+/cr0oz +. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle t /zw rzms3+/0t;5u 6-uonmwunscr+p 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 ) i0j kxjn6xi(y0lxc s)29yi dabout 7.0 m in diameter. The top is 4.5 m off cente0(i l)0jxn 9kidyicxx)ys6j2 r. How much farther can it lean 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 0.0025 cm. How much force w/- sdbi*/ajwml/amm1 pxtnn8 kv 4o:7 ould be neede:a ib4v7dm kn t//8p/mxjwl*1omsna- d to compress 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 cross-sectional area ozzu:(hs6b k n l+ dn+f,nrd4v7k(sp(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 xeb:*7o clr9;) jm3vy ze ,brzdiameter. Young's modulus for steel is b3e*cerybov rz)m,9 7l;x:zj $20 \times 10^{10} \; N/m^2$. 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 r:92nfzb x,c*dbdg*w force is applied. What is the ew z bbdg2f *dx,cn:*r9lastic 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 diameteaa,6*/udhlp+rya co t 4eux(*r 1.0 mm and length 11.2 m. How much will the wire stretch? The Youdl aur/c *up6(y4* h,xa+etoa ng'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 l7,xq6 fxz) a/cyn g)xo(un y4his weight on the two crutch tix)zyu nxoy/l6f(g 4,)cnq7ax ps, 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 an area od9yx0 bs) k*92zwi2 jfq/rd sqf $1.250 \; m^{2}$. 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 supports a 10.;j4yig9 f0hbm 0-kg mass. mi4g9 j0 hbfy; What 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 and83 /n;+b9hp rnvw csr*z hmte8 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the ww+cehvn93b* pt hn88;rzr sm/ire? (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 a8z5wb gf km hka44;0ugdini0:luminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulu0gdw8 0;4nimkbg:hz5k af4ui s 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 pr5 oyhi5wgs 4 aefq62iavx tv/pe,9 m,0+wo4 mxessure has increased by 100 atmospherwfi 20he4 a5q6m m5g9 v/ot+a,x4e,vxi w pysoes (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 hasvi t k,:,8sezd9jwei) a diameter of 30 cm. The compressive strength of steel is d8 skzi,i ee) vwj,9t:$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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