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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 k5f 15+afvvj,he.nwx necessary for rotational 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 condition 7wp0:vlaxsyq 8 yt7e:s are 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 +c/g zjdki s(4above your head the net force on the book isci4(s /gjz+ kd

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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.ymavqv0 /9o*m8 m/s. What ne9 */aqmv0ymovt 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 stands wit1c60bpjb(+c ec6r:1 qd xt cdih one foot on each of two bathroom scales. Which statement is definitely xq:rc61ejtpi +c0 d16c(dcbbtrue?

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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. If they both mm dqo)f8up4* bove forward so that theyf4o u*p)qbmd8 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 small end is iqfbqx5 kdbi+a 2(0+vq:1ofu tn

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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 ixr ukt)c:q2 +ab :nwd8s 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 dimensio4 r jc8poy bpa(,)c8tpns 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 end of the top brick can extendo8p jab c4p r8p()yt,c 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 aparz/e7 pm,zx3v1 ej4byct on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause the table to overt 4c,jz1v/pxzmb3e ey7 urn?

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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 st2yekzlnl6p(-l z- eo;5 ns d2ieel. Which wire will 2lk2 lol5n6e- n- zzpdys(i e;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 of 36 N ehi u.z/;by88j7 kjvk. If the wire diameter were half as great, wej88k i.y ;zvh/7ekjub 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 the base of a pointed arch f;t i1soedw9+)*s g qriirq*o)+f9gd1st se; w 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 thut3+fu0x g.zfe weight to be lifted is 1.0 m. If a worker pushes on the op0fu.u 3x+g zftposite 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 weig 5iuarx.;9cvoht to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force5cv a;xru 9.io 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 9uqdjq 4p0e e6q:f0 ztze(g*p 3r5 5xav y(xyb75 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 ot3q45ye jbxpq pa 9ze z6xy((e0t5*r dqvg:uf0her 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 pivklv 9s+tgta/ 9ots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass+9ttv/l sg9ak 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 supports two children weighing 500 N anddx+r7 ;d m-,tyhi9;ae kouxi9 350 N, respectively. If the support is at the center of the board and the 500-N child is 1.5 m from the cer y9e-dh;i+k ;7udo x,x9mtia nter, 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 supgfu :xpa+x0r2 oz-uu: ported 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 left rope?:u x0ap r z2g:o-fxuu+

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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 ends. . lxj od-h ,(/q4anlhn If a 400-N person sits at 2.0 m from the left end n,(o-lqd h hnj/xl.4aof 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 aaqot4(2dy h vrs1ooue 8b5;/ct each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in each t2sa crq d4ybo hvoe/15(;8uowire?

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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 18a :ugx tdpfn +63px2.rax :bh0 m long. A urx ph3g02 :npx:af.t+ad 6bx650-N box 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 kah + .vs1s- j482;htesge mltj+qf,lxnife 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 keep the stick il,ahs.tj4-q exv+2jmte+;hfss g1l8 n 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 weiggs5 -yg/lgudl x3jvi/v wa1*5ht 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 thy-j3*d gwi5g5 glxa1us lv//vat 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)oe 86oa hkvx7dhy );b 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person now lies on ty )va)87o;dkb oxhe 6hhe 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 qit6v54ce rnuz8oa 32and connected 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 hastv ar 3o8zcqnu ie4562 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 ld;n c 6er*,l:ipp6fued+s8 p CG is 12 cm from the elbow-joint pivot, how much6 dl p,fude6cp e*sirpl 8:;+n 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 oute7 ts* x)oblwc6- 9pacir wheel base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.2cwbol7xa )t-sc 6ip* 90 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 about 7.z(jxt+yk2akx gu,e*) 8iidb0 0 m in diameter. The top is 4.5 m off center. How much farther can it lean before j, k 0e2+8tak)bzg*i ux ydix(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 compr8;r;pm z6m ,wzzknai moz+w2a3al x2+ esses a steel block by 0.0025 cm. How much force would be neewz+3a wx 2z2 6a,+ rm8zp;lk;aimm onzded 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 hasgfjy4rad 3q8d 0d(pj*vwky5 8 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 m 5g5 lyubd6d(p )k 0axzin diameter. Young's modulus for steeu y5za6p 0xdk)5 lg(dbl 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 0.20oj*c25 r+mdg,/ t rons mm stretches by 0.20% when a 6.28-N force is applied. What is the el*, go2/cdsmrt nj5or+astic 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 m*l/*k+nyupqc* h /pkkm and length 11.2 m. How much will the wire stretch? The Young's modulus for steel isk l+y*/pp /ckhq u*kn* $20 \times 10^{10} \; N/m^2$.

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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 cru c70b pqvc3q5rtches supports all his weight on the two crutch tips, each of which r 53cbq0qc vp7is 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 of6 ) t4d2yggz*p c5fhxf $1.250 \; m^{2}$. 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 acpp+- f7wuibok80;nj nd 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's 8c k -n;uj+wfpp70boimodulus 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 abpqjvc,)l h:hs r)e89a+vs2p u vm//s 10.0-kg mass. Whatj8hm)p/va/ +2v )ecv q: s,urb9slp sh is the elongation 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 t9c.g m)mxtv jz755sb aluminum cube with sides of 30 cm. What is the resulting relvt5gx 5bsc7zm 9j.)tm ative 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 theghfduzyz k eh.mb ,ri4+h:4*0z;wg- z pressure has increased by 100 atmospheres (to about brid4m gu4z ;feg zhzy0.* + z,-hwh:k$10^7 \; N/m^2$). 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 haw(i :v rj 4vpm- h1kzia0pj-,ms a diameter of 30 cm. The compressive strength of steel is -hw,prz4v: jm(i1p0 mvai j-k$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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