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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 rota; dpi8h2k0nnj*eil1xtional 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 static equilibrium? 1xim)*r drn9hiq k v.,9ryzg,c9 qjd5

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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 f+v/9k lb*x mf4t 6tp8xga yv0force on the book ist+ xfkvp4a0yl v/f8g6b9xm * t

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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 outp)+qgww/,gv; d8p h1xzj1 kc xer space with a constant velocity of 9.8 m/s. What net force acts on it w dw1+, pzckj8gq/p vh1);xgx?

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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 o oq+z9b1 vb1cwf two bathroom scales. Whiccq +z1w1v o9bbh statement 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 seesaw. In7 e gpsz7ldss4y1x;(f they both move forward so that they are one-half their original distance from the pivot point, what will happen to the spdn;zsg 4ys (1 7els7xeesaw?

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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 is df j*aexj*/)vin

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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 tal*6mi )0yj anov;h pj3bletop 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 10.0 cm x 6.0 zm66ng cpfz;wdw94l 9 cm. One is stacked on the other, 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 withoun94lcf69z d wm pgw;z6t 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 thrh7tq 5eq b0f3pflwa/3+ p,ur 1uh2mxgee legs placed equal distances apart on the edge. What minimum mass, placed in the middle between twum,3fgp027la rqb /f+ht1 3 uhwexpq 5o 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 k2/;1yx h rzq-i4t5q ds+yvxqmade of aluminum, brass, copper, and steel. Which wiqd2 5vtyq;zksx r4y /q1xh-+ire will stretch 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 subjecgbu ip2l*;t c,ted to minimum tension of 36 N. If the wire diameter were half as great, we wou*;2tlb, pgc iuld 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 n qxj;8ckjj6 a7l .kub1c+6haat the base of a pointed arch i .b;6xccnh j6a +jkj1kau78qls

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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 fulcru,*v:y t c8i46bmmyiaum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can be 4 t6b myiyv: 8cuiam,*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 distazw* z-ao 6m-gtnce from 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 exertedtg-w*amz -6z o 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 balance2*0:eacyg w3hk np8x8xs4y mr d on a massless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If tn ey rc :h8p k0am38g4yws*x2xhe 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 oppo of 9jnuua qkau+,h .n).o o:*ev-9a+3ripmopsite ends of a uniform 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.v- *fauniean3q.. u au+pomop)okr, 9:9+ojh 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 txnku b 5(2xr-x: qove.wo children weighing 500 N and 350 N, respectively2r:vxxek-n(u5 bqx. o . 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 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 rope8l8.ii-wno+v+er.bgyktdi- 8l p0j s s at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension oigdj0+ny pe+k bl-8v w 8.rits-l.8 iin 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 ajw -xrvp es0 w7hfsbi;)m38p:2v-hekt the ends. If a 400-N person sits at 2.0 m from thh-w i7s03v)xep f2br h8ks;j:emvpw- e 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 ::xmd2qk8m+ w9euzgf1iduizj+:i 9a scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tensioj u zf91ux+: i gdiimaekqd:m2w8:9+z n 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 srilf me41q8i4caffold is 18 m long. A 650-N biier1qf ml844ox 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 evkl(;n5d mt+vd cey ps.u(sj( 14 i:vvdge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-(dj4 cv ypsdv (. vkt5:sv1u+;nie (mlcm 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 board of weight 100 N /nrrdys y/k0z42d. s yand 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 the right end iyky4 0nz s.//sddrr2y s 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 betr1;+he tkp9 g n bene ujt((;zxp6t)b/ween 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 lo9 petu e;z( +bbnj rhgnt)x pk;e61(/tcated?

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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/u hwj6pr7d /xrcskh-lc/ tm /3and57 by a wire. A bird of mass 0.50 kg lands on the wire midway betwe 6wrp/-c t3d /ms/h h7k7nuc5lr/axj den 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 mass of 2.8 kg and its CG is 12 cg,b ;in6b7 lhp4x3a vjm from the elbow-joint pivot, 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) b3bxngpa7vh4ij6l ,;?


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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 5y vtx)+pto8kcenter of gravity is equidistant from the sides, andk8tp v)x 5oyt+ 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 tallfq)ba8 fg 3t46zrgeecl h7f/q./xqi ( and about 7.0 m in diameter. The top is 4.5 m off center. How much fah(qgf4ze6qf7qgc xt /r /bf3al.e8) irther 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 would beoi6ip hg+tpx-tm / :f; needed to compress the block by 0.0125 c;:-iotpmti/pgx h+ f 6m?

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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 of 1 n85cock u63ov/0a2xka7q g nt y1+l hn$mm^{2}$. 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 anpru0nsqr)j;p(4s m) 0s gu,z bd 0.20 m in diameter. Young's modulus for steelmp(0rjqzg4) pr) 0,b; ussns u 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*cans *wr 1x :x2+cudl7svs3y-N force is applied. What is the elastic mx3c s:+2dyxs* r7 n*wuls1av codulus 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**uv/5+ 7lim5;ije*xogm l whhnp*dj of diameter 1.0 mm and length 11.2 m. How dlh+ i j*hpe/u7 5n *wlo*i xmm5j*gv;much 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 walklt5/9kb4var/j u1 fu king on crutches supports all his weight on the two crutch tips, each t bjkrl5 vk4au/u19/f 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 wf( 9g3f5ime//hrabi m.tz 0oan area 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 diayvb. )ije,tt 0meter supports a 10.0-kg mass. Wh)0tjei btvy, .at 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 lenu(2ev m5o2k gygth and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Y gv22yem(kuo5oung'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 aluminum cube with sidelr*-l makr57y s of 30 cm. What is the resulting relative displacement? (The shear mod-mka r7l l*5yrulus 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 js(ts( gw. 1k,lcl2ssin the sea the pressure has increased by 100 atmospheres (to 2.j , (gsks(lls1 wtcsabout $10^7 \; N/m^2$). 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 o7;): tbbq jjfwf steel is7jwjt;q )b :bf $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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