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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 rotatio k,kup(02dwshwvwr4 . 45gvgknal 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 necessary for stati+bo8t6+7 wkrz l9lnup;/yx jmc 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 reb ixc2fdof 9 wi+0xzg2;rxhg.3h*y6bst above your head the net force on the book i9y0ff ; io2chw*d2xr .bz6xgxig+3 hbs

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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 constant velocity of 9.8 m/s. Wzh:0ypyx k;6xd w: 2xjhv9. mz0l/sl khat net fo v/lz2 xk 9 j:dhpws kyx0hy:m60;zl.xrce acts 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 each ge+m icu: f5z75) hubmof two bathroom scales. Which ghme)i 5 + zubu:mc57fstatement 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 light girl are balanced on a massless seesatus9(ml9l 2za w. If they both move forward so that theysu ll 9m2az9t( are one-half their original 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 sma- dpvl)877i tcj2bpm 3 x5dmbcll 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 tabletop is inpyp8gvbtzj 5 f+z+ 8v)q4vd9e

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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 20wje )v;ym58*d(y1rou 7 fpbfu.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is then placed so that they project y5(7y*pj b 1rfuwv eo;u)d8f mout 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 tw2 0+wfpsligq 8zh d7d5 7;95oidugm 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 cause thedq5t i7 dhwd p8o5 7m+w zgusig9f0l2; 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 k 9 ctzu;/oz2waluminum, brass, copper, and steel. Which wire will stretch tw/zzuo kc2 9;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 minimum3, tsz)q gax(f tension of 36 N. If the wire diameter were half as great, we w(t)xsq3az,f g ould 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 thex g:5m ofw0nky1cx2;4ia0mj,f /zzcz base of a pointed arch isc2cmazxf 0xizo:kz41j w5n0/, ; gf ym

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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 the2r )6i2iyj bxqgm -f3;ij )hnf weight to be lifted is 1.0 m. If a worker pushes on thej3 )mx2fi)ynjf- 6gqrb 2hi;i 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 fulcrum to the weight to be liftecb8nbgesbikcp0 : otx8;sn fo7/( 6;a d is 1.0 m. If a 3000 N rock is to be lifted, hoeo7ack/ s8;nsf6:pbc(ob0bn; xig8 tw 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 baly-*7odqwk ht. w1tg 5yanced on a massless 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 onwh q.5w7*k -1tydogyt 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 opposit; (dcyj5qbozmw:e 6b-e ends of a uniform seesaw which pivots in the center. Child A has mass 60 kg and sit56;dj e m:-yoqbcw(b zs 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 sqc )bonj0uj )rh;uc s+a:,y j3upports 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 1r :,usync30j )jhab)o u; jc+q.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 tr w84nqk7y*ol5zd 0g2rm a9h:nql)gvhe ends. If a 400rd rgym :7kw* no haq8lgq)l0n92z54v -N person sits 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 weightbdf 85r1e3h1p0pw me i ;gbj9r 100 N is supported by two ropes at the ends. If a 400-N person si ep9h 503wmgj;8 bbefrp1id1rts at 2.0 m from the left 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 ,pmx7 dml g0h1scaffold is 12 m long. A 300-N box sits 4.0 m from the, mg7m1dhxp0 l 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 wire at each ,wxl90yuejm( end. The scaffold is 18 m long. A 650-N y 0e ljm,wu9(xbox 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 knig.8zx 7xe4b ch qmq yo3vd65ewk)i6,l fe 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 hung to kg oem6,87c) 3 vzd x .bhyieq46qxl5wkeep 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 wei6 c bdta.+gd5-4pyeadght 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 theb5 dt+d. egd64 pay-ac 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, anr9l/6h fvtb+3dq8mouk3 o; fkd 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;b9/3vu tdokfofh 8lm 6q3k+ r 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 by2g(- huxb k91ngj7sp odw.-ay a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0 m below hogou apw b97hy-gns k1.xd- (j2rizontal. 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 vg xt 08jqrm:op4+qv/ CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper a+ pq8/rotgxj0vv :m4qrm 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 widt0,u h fm:cbwiui6w/f: h of 2.00 m. Its center of gravity is equidistant from the sides, and pf:wbui/,c fi:6uw 0mhositioned 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 allf(pb1j j.fnoi3/ t1+hfm;z bout 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it b+iff1z ;t(jplm1.lb/3no j fhecomes 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 forc18 n tduc.tosou 2x5yz6 ln45f,d0m+gb3dtzje would be need1yjztubn8d tdx4fd2+lo5z 6n3m gos, 05 uc. ted 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 7w( .ztwv2gvdbkx8o 4,8l lytcross-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 0.20e1c ge+b;b4 xx bb:5td m in diameter. Young's modulus for gb4e b;t5dx bxcb1:e+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 6.28-N for zra a4/h,dq; j9 wa/(syossq8ce is applied. What is the elastic modulus of the wire4w(,hs yj qs a9qzra/ 8d/oa;s?

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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 diameter8o*95 g 8ldzueg1r .o:twncbw 1.0 mm and length 11.2 m. How zcbg88o5dn1rgl ww *e .t9u:omuch 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 th5m5e3 xzf qc( *emxpu-e two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on the xe-zf5xm *p(m3qeuc5floor?

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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 areaq1wy7an(jm6 bzms3d( 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 diaax4ydwmy )d7p;+nf thqd7-g,meter supports a 10.0-kg mass. What g qxyd)+7w hnpdd ;-7fa4 ty,mis 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 ls npx :;7omc+m3w ede7gb3 4z2za, gka 10.0-kg mass. What is the elong: sgw; ,37k4pn7zomm2a xebe l3 +gdczation 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 al+o zv)uejjgb p767:dox cc,;ouminum cube with sides of 30 cm. Wh7c;zduoeb: xo o)p ,gjcv6+7jat 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 the7f,bnnlz 9vq + pressure has increased by 100 atmosphezqvnf 9nl 7+b,res (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 qu3aw4 wt:j1s cm. The compressive strength of steel is3wuj q:4t1 was $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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