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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 63 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test63.html
 作者: physics    总分: 44分  得分: _____________

答题人: 匿名未登录  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 equilibrium?w2 gcl nyjftamos-i 0/,)rh p q-*7h3l

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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 equilibr2 l2l3ixeyy 37lbn 7bc zt2+wzium?

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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 forcl t 5xurxk2*nus0.; cje on the book irt*l2n5uks;.0 jcu xxs

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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 v 79ewojb60pnhelocity of 9.8 m/s. What ne9 woh0j 7bpen6t force 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 s6yeg1f fxap 574izf: utands with one foot on each of two bathroom scales. Which statement is definitelyaiy x1p74ef6z5 gfu:f 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 see 3.-x:uaas3;+k w 8jwk4irki81s a2uluigxwrsaw. If they both move forward so that they are one-half their32 3 ;skj xauiw8uwxiuk-ra.aw+1g:skli8 r4 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 small end mjjjk/6 m:ly1is 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 lahs6yr0f q8. 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 bri gmjrj1-ka(d,h 8vf+ eo)o oh.cks, each of dimensions 20.0 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 out over the edge of a table. What is the maximum distance that the ef g.oajk+j v()dhm1oh 8r-,oend 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 legsswwas z .qpu.-)r)k5j placed equal distances apart on the edge. Wha-zr. apw)ks su5jq)w. t minimum mass, placed in the middle between two 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 mader c a5u0rx+rm( of aluminum, brass, copper, and steel. Whi+(mrxr05acu rch wire 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 subjected to minimum tension gf5 y vfitqkot3v4.*nm 83o)iof 36 N. If the wire diameter were 584ofi*i)v g v3o.tq t3myfkn 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 buttressing force at th w-lz vud br3jxf*g*4*e base of a pointed arch gd*x u43b-rjfzl *v*wis

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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 nv +ex,c:nlovs;n a)2to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can;:xo, e+2 a) vnlcnvns 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. Tg3j7k, yic-bjhe distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rockj iy,b7 j3-gkc 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 massless seesaw. The boy has a mass of 75 kg h;oat)u0q /r a lz.w,band the girl's mass is 50 kg. If the boy sits 2a/wb ,r hla .u)oq;zt0.0 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 the center ceao7f q+ey7e+;t3 fe/xfb,f. 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 B sit for the seesaw to bala/b7+ fc3 yefe;t, q+efax7e fonce?

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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 welk th rmqz(wxz58qn*g ) /7xs/ight 40 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 the position of the 350-N child kgx)/57zw*n/8rx(zhtql m q s?

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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 9:6 y rz0oum,iige oy.fg-0nksupported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of,6- o:numk yr0zgy. efgo9ii 0 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 weight 100 N is supported by two ropes atp-0g7,dh l6yo lgs .zb the ends. If a 400-N person sits at 2.0 m from the left end of the beam, whatgszl6. lhg -7 0dpby,o 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 h s60:oixb-x h/yyklf)8dc* f4xq,v ba 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 tensiob8/, fvoif h-k:y4x* )y6ld0qxbscx hn 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 is 18 m longrqd,7q jz uuuo1y9 7ew c9nf+2. A 650-N b y7e7cqrdj,fu uzun9 q 192wo+ox 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 masy05 tfqj(ha8qk *r.b1 y zzc hs)xvw.(ses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. Where (at what*a rqth0vwhfyk5.(z sxyb(j8c zq.)1 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 7yr /wl7*-z sfu2c *q tltt;xv3t8 ipmlength 8.0 m. The board is supported at each end. If the support force at the right endtv2;zlfqi rx*7l7p-tw/c * t8m3stuy 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.m.w vhi -bmze5pq f,:(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 :eq(-ivbfh z.,5 mpmwthe 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 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 contztos1s 4dl 8uqdd pd:1. ra*/nected by 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 horizontal. Assuming the wire has negligible mass, what is thed4r/ulo s 1az1: t tq*dd.sd8p 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 oo sz uzn5ku0 uajx*(; aq,oce29pzi9+f 2.8 kg and its 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 to hold a 7.5 kg shot put (Fig. 9-1u+nzi9k;09o*zazo2(uqx j,eu 5 pacs )?


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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. 6 4tsghf9dkht7j4, pu Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at h6 ftsp4uhj7 ,dtk94g 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 Pisamxi m2+ailiw70 :f.fx is 55 m tall and about 7.0 m in diameter. The top is 4.5 m x+amwx2.f:l7i m 0ifi off center. 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 rk /p l tv-gi9+;:7zhoyr o/jyvf: 6hz0.0025 cm. How much force would be needed to compress the block brz;/yjg-hz/7 yp vhf:oriv96 lkt: o+ y 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 longo;3cwa2/ ismj 97nc0 y50 zogye5zaja and has a cross-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 6g2lkn2a ez/e6et 0xgm in diameter. Young's ma6e 0/ ekg6x g2nlezt2odulus for 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 stretchuf ywi53jx17xpl:,p d es by 0.20% when a 6.28-N force is applied. What is the ela wlx 7 5pfx,y13udij:pstic 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 diameter 1.0 mm and length b5 h.;vi.mpe23nylzz h32rwc)xhkx*11.2 m. How much will the wire stretch? The Young's modulus for steel icvkh zbpe5r.nxh)*3x.2zhi3 my;w2 ls $20 \times 10^{10} \; N/m^2$.

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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 weigh qp810p4,o s,dmrakqg/ p*nwpt on the two crutch tips, eapmappg*o/p ,,s18 rkdq 0n4q wch 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 o..jif3;z fab4i5g hpef $1.250 \; m^{2}$. 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 )m*dd-3x t; 1cvrmvcglength and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus forv3xcvg1drtm d)c *m;- 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 suppozz-s0y8ilq0a gwfcz5vhl/16- gztv- rts a 10.0-kg mass. What is the elongation of the wire? (The Young'a0czf1v vg0 5-z8tgy-zswhil-/z6 lqs 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 app6.k8 r0 cy5di 0wc3rdbbu.y mzlied to one face of an aluminum cube with sides of 30 cm. What is the resulting rz kyy c u6.m0w.50c8bd irrbd3elative 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 the pressure has increas6k3symi/o 0gu)nrptb (cn /0ied by 100 atmospheres (to abo3ck tmby0/ig)n/( rus pio n60ut $10^7 \; N/m^2$). 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 o;ml0tko 2wvic 5*c *fcompressive strength of steel is2fv*5km tlo; ocw*ic 0 $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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