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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 pzxpsyx/du8 w/ -y 5m6equilibrium?

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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 a sxr. 7y9iai oh6i))xore 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 ne0dufqr 9 c;fn7(nhx5u t force on the book isu9n5urx0n;(cq f f7dh

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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 consta-fz+4(a w arapnt velocity of 9.8 m/s. What net force ac 4-awfa(paz+r ts 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 of two bathroom sc +ybj .)7u4)tgtvk hn,wk6 oviales. Which stat+uy6 )ho7t4n vvjg,ik) tb .wkement 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 mass8khe 3: /lwcvtless seesaw. If they both movetc:3 whlv8/k e forward so that they 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 n/ i. vvevsqguzwvr0yw27hb1r/55q7o5s5 pt small 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 ine4e m w+cfbq.:/bry7f

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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+o inye8 rd2/d 6.0 cm. One is stacked on the other, and the combination is then placed so that they project o8y2d+ neo/dr iut 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 distances apart o ymhueh;gus)zpi 9:/;l1o 1p ln the edge. What minimum mass, placed in the middle between two supports on the tabll1mehs luh zi/py; 1:o9p;)gue'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 i yk-j;*pio jhw7pk;q)w7po*g3bn4u b dentical wires made of aluminum, brass, copper, and steel. Which wire will stretch the leastjg pun4q7bhikwkp*wj-7o3 ;)py*o ; b?

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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 tv 3dlgcfk ip.ts+*sp5);j hz7o minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when su p.hfsst37) ;pj+g*ld 5kvizcbjected 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 the basebvsh8l84-e u(t w8 s(/brwxiq of a pointed arch q8 i lhws84uwseb(t /x8 bvr(-is

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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 dny*j 3sim*dd8vnc )q-c us: .histance from the fulcrum 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 t j.*:3dyhicvm-s dc s q8)n*unhat 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 fulc2 *+nle:egadr*sqch, rum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifte :dee* rca,l*hsn2+qgd, 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 masslesszc lak,8sm8a 3rylj7 w8yqs(. 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 ths7aa8(ylz 8r8k,l. ymcjqws3 e 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 opposim,lm6c :ay/ hbte 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. How far from the m/m hay b,l:c6center 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 suppsb8vwbm3-3hx. yqb1v(hpt1i orts two children weighing 500 N and 350 N, respectively. If the support is at the center of the board ashx-bq1vm. i v yw p(tbh83b13nd 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 4 flnw4p/ ie1z: cmy949zibf kropes at the ends. If a 400-N person sits at lfy4inzk/4bz wme9fc19p: i4 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 weight n4yamkbm 63b g -qi-*py6qr,g 100 N is supported by two ropes at the ends. If a 400-N person sits atqgm m-g nbb6 3y64riaqypk*,- 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 scaffold is 12 m)opng-m:snh /f5 wl;k long. A 300-N bo: go/5 phsf;)kwnl-nmx sits 4.0 m from the 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 u,p5me2n/ dajl3d),aqwzshpr wfe +zn; j. 7g. p by a wire at each end. The scaffold is 18 m long. A 650-N box sitsh+ 5 ze7 sa3d aq /djrwz.fmpn.,wjn;eglp2,)
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 supported8 xta+67 rbyhqe7rj) z +vcet/ by a knife edge at the 50-cm mark and has masses of 0.40 kg and 0.6v7)e ++ 8ehtyx7j/t6rbrzqac0 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 board of weight 100 N and l51qw6h*r rbveength 8.0 m. The board is supported at each end. If the support force at the right end is threewr rh1b5 veq6* 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 betwel3fdzj*wx;f v c g//g:5opp:ken 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 s:3kgwj :pfvx/olg;c 5z*pf/dcale 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. pq 7bn3.ib0fgA bird of mass 0.50 kg lands on the wire midway between the poles, causingbf30 b7 .ignpq 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 nhw(yqt(eyk3 c*a-y/ 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 k(a(q3*/ychty -kwyn eg 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 m. Its center of g7i1r-ijzfo + d a,hig1ravity is equidistant from the sides, and positioned 1.20 m above the grounoid,ii11+ jar-z7 hf gd. 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 y 55,bmaz7nmcr43 kwr tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean ber74y m,ab3r5n5cm kwzfore 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 compressc ei3hzdn2.jq v ei 5:l;fy/)hg,u09 k m:uimyes a steel block by 0.0025 cm. How much force would be needed to compress tnh. g /vqm 3zi2ij9iemkduh0; f:,ul5eyc):y he 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 andvqr85 9szl r :5apg3ez(oyow4 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 dn gz -foydu7/3*fe r0service station is 4.0 m long and 0.20 m in diameter. Young's modulus for sefd7uroy *zd0nf3- g/teel 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 -paeb.a 8 p5cnd9n-cr% when a 6.28-N force is applied. What is the elastic modulus of the . nccp-rpn8e95-d aa bwire?

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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 suspende o8 )ahv0gaslez/94 8igmxk;n d from a steel wire of diameter 1.0 mm and length 11.2 m. How much w z 9ak)8/oesm4i80g;vagnxl hill 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 walkin s8cqu5 yzg::rg on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is gu cy s:r58zq: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 arel m1v8s6smysm9dy -buw/5fz4s3ot.za 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 yl+csm*2d,pt,a vt x1m in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (Thxsy2v dtc m,lp1+,a*t e 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 suppor ry2 d97sown ouec,k+5ts a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminum is ynw+ckue25 ,o7o s9dr$7.0 \times 10^{10} \; N/m^2$)

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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 toihj r *kv1w f8rqf4:t9 one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulu8r1k t :fj9vwi hq4f*rs 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 increased pswk2eiknd (h+,,np4) . cdb cby 100 atmospheres (to adi4+2w)d,k(k n pnsp ec.hb ,cbout $10^7 \; N/m^2$). 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 strl3o90mj:)fr8qc y0zh1aa zl q ength of steel isr) flqo am1z9 0 a83:qlch0zyj $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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