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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test63.html
 作者: admin    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 equilibrvtpgut 7f . ; kfw1(r1pe,:oncntn:p 9ium?

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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 areh bu 8-0enbw3x 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. Wh7ey1h1tlnd 1libx/ j4 en held at rest above your head the net force on the book /idlj1yenh7 lt14b1x is

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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 constan*, car 3xpib2xt velocity of 9.8 m/s. What net forba3 ir2xpx ,*cce 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 of two bathroom scales. Wh kat5.p-g7 wt 7rrev9bich statement is 5avkr7-tt 7g9e w.b rpdefinitely 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 bau pcmbo );.9dr hto,)7e 0um owelp6/wlanced on a massless seesaw. If they both move forward so that they are one-half their originhm9 dr ow p.)p6)m bo/uo,c;70uwlteeal 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 i+hg;zyvb-ng8 mdh9j y ek+-q/n

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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 fcqmm0b2knus k0;4.t q.q (hahorizontal tabletop 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 cm. O 66ddblw oczcdig,u x074l,vy;)tv ;cne is stacked on the other, and the combination is then placed so that they project out over the edge of a tabiud;l,6ldcd,v c c )7 g0 zv;y6ot4wxble. 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 eqxq632d ffi:ez6 i9wuo r5, uh sf01dhfual distances apart on the edge. What minimum mass, placed in the middle between two s5s3x6 w2d heffih,0ff1:qrzuu6 9idoupports 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 ixe;j,8klbmr: ecl0sdj3)sj2 dentical wires made of aluminum, brass, copper, and steel. Which wire s0kexd,;2 mbe3 l j8j:rlc)sj 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 wqldaz3 5wpz71hen subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected a1 z35zl7p dwqto 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 buttressioki2m)pzkww;jf :+) rng force at the base of a pointed arch jk o)i+zm )pkwr; w:2fis

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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 to be li--w ps*k ,a g9f 6j;2ohnempxjw(ks*e fted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can p ww( se2*a6-kk nj*ogx,e9 -jsf;hpm 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. rr)ccu, vm2kv j qn0oma .9c8,The distance from the fulcrum to the weight to be lifted is 1.0 m. If a 300,).cr0nc amk8jqu9ro c vmv2,0 N rock 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 masuxhij.,4:g9*d3e t4 dgq rfhvs of 75 kg and the girl's mass is 50 kg. If the boy hg3*iqv.9jd4 f:gex htr du,4sits 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 opposite ends of a uniform seesaw which pivots inrt+.s.vtpj 5y the center. Child A has mass t sy..vj tr+p560 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 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 su .uzo;:05;.qvd njw,zc tvvdopports two children weighing 500 N and 350 N, respectively. If the support is at the center of the j. u qo:d;ovdzzc.,w;v50tnv 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 rhj7p fl0qd982n.xs pis supported 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 lef9n0 p7pxhls dq.2rfj8t 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 7 hn-rvzakr:3+0mkk tweight 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the m-kvn +:3k0a z h7ktrrleft 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 w7-t/z,x+a( 2v0gj ycwdcuk 0abvra+end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the rackw 0-x vd2+y/0z+,(7ac b wagvjuttension 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 sca1gv i+xkqu;u 8ffold is 18 m long. A 650-N boxk g8uxqiv u;1+ 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 sufzy7t p36vb/;ob kq6coz9 l:jpported by a knife 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 jf:cotq3b6p6/o 9;z bzk yv l7to 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 t nrl-jbkvcgf;*+3rb2nem05on8 * f aon a uniform board of weight 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 lejbtfv802l c5gn* ;mr- n* e3 o+kfbnarft 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 /)kbii 9 pe; z0qfue7bis placed between them. Each scale is observed to read 2.00 kg. A persiqbp) e;ki 7/9fz0eubon 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 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 cwcot83 4k ytyjh q541zonnected 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 ne8yt4qzhw 53tj1 ko4cygligible 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 CG82w.dzp 6mnnu)t/:eta tfcpwe. 8 8 kf is 12 cm from the elbow-joint pivot, how much force must the extensor musc8fk ftwecn m2pz.at )up:nte w.8d/86 le 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 outer wheel base width of 2.00 m. I)v3 u og,clk8qts center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum s3)kc8og uq,vl ideways 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+vqjl8-gwm pq1fi80;daooj, tjf, o+a3g cu 3 is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much f3qc j 031fj,8ouaf; 8 g+ poivjodtl m-g,w+qaarther 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 woul8u5q/v: ymw*8qiwvx,yhj4oeau/e7c d be needed to compresj5w yuwux: imvoa88e* /4 ,he/qqvc7y s 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 cro,ponrx18 l0srs 5g-ness-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 uc3di+o*mvb3k gq. 3 u4.0 m long and 0.20 m in diameter. Young's modulu3m uv og.dk 3i+3uqc*bs 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 stretches by 0.20% when a 6.28-N force is appliedo3*u frfdev62. What is the elastic modulus of the wire e3f*v r2oduf6?

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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 suspin,s. ts ;t3 eqmunt+nd:y7i7ended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire su77i. :s3,ennqi tsdn ; my+tttretch? 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 sdxdbtzlnaz6 iu 2c k q)5,k05)g1(qwaupports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on the floor?d1uatk ga ,5n6i)lbx kqq ( d2zzc0w)5

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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 areah, f:jyw g:9e9psqd;nszh 3i, 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 diameter supports a xxc/ ;utli* 0cpe 11uf10.0-kg mass. What is the stress in the wire? ( ufet* xpiu/cl xc011;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 supporfm; ul(t z4lgey,envc1u ; 61gts a 10.0-kg mass. What1lgl6c(mfu;y ;nev ,u1e4g tz 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 k noxlg;6+xpmh3 6.cecef 2+ul9ib8s .jqmw8 N is applied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displqx2+ju spwg lemx+nmce63 hkcof;68.l8 . b9iacement? (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 t5/bth) z; fu5tdmlf-ghe sea the pressure has increased by 100 atmospheres t lgmu5 ;)/b5ftzd fh-(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 diame-ml p j*)wf,ju0mwx.vx x f*/nter of 30 cm. The compressive strength of steel isu)m/j wx,f m p*xjxl-f. 0vwn* $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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