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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 equilibriumi,lsdv- yh7vz9 :f -urou,a8 n?

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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 l+: b3vwk)x ;1n5hqebvrh(nf 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 h d wxkrrghs34 385g(bgeu )(,uhfh6zqead the net force on the book isg ghrf43 es (hbr6k,xhdu wg3z )q(85u

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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 91 sf1u m* k0jvcfze(:i.8 m/s. What net force acts 1m :(1i0v kes *zfucjfon 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 bat:f j5hfif:v /kej27a2( 3ybmwp1fdu phroom scales. Whichf2j17ahp/ 5::fmp dffbiw3yu(ek2j v 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 lig) g9zi3woroat )swoaf7 cf/42ht girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot poir a2twzo/fo9cga7 w 3)4s)fo int, 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 ij y3eu 5e qeqs7h7ubo l4:dl)0s 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 icy 1dwlmgnshq*8hunu41e ),*)i 4y bds 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 q5p kkt.4hg7ecbf8 m ayn 5 8z4pw.a7adimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on tz.c kp8mkb gepa 854wqah 77n5ay.4fthe 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 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 supporte9wi f y7+yvovxr+,;v id by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause the table to 9o,yw+yf ixvivv+r ;7overturn?

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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, j z ,nrwl3;smw38v wbh(h-7egand steel. Which wire will stretch the-w3 n 7h jb8 lrge;,(zwmwvh3s 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 ofvfif5 g: lt o:zwduhif s*6wtr+/7h, : 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tensionrht*gt zs:d7fow:/i ,6+ 5f:vwihflu 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 ad-u-g z-oy-esy;w/j6hr(ob-9p lec brch s--b-r -g6y (bp/o-yzdwhjl oe u9c;e 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 distance from the fulcrum to the weigh y,t0h- hez,byll(w7 st to be lifted is y0ybw z- hetl,(sh7,l1.0 m. If a worker pushes on the opposite 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 t+nslwgu wc di u(7u*7 wx1(nb9o the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on the levg(isuw+*17u ln9cdwu b( xn7wer?

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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 b-dlu(j13au fjlpc*1 doy 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 o1 u-pl(l1fdcjduaj *3 ne 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 whi7t()u y 3o rfj;di:5 iwrynyr3ch pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has nditj57iwru oryy3 ;( :)fry3mass 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 c(11 znxelid5,at lg 1a 9bboy5hildren 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 ce1oaxldbtn 5z( 9giy5,a l1b1 enter, 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 ropes at the endb v4fbux5ig29 s. If a 400-g5 viu4f9xbb 2N person sits at 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 100 N is suppoi n* /h.kawy,srted by two ropes at the ends. If a 400-N person sits a*ky s/w.a,niht 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 is8liji b)pak5cb p;4/z held up by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is thl4 )bc iab5pjpz8i ;k/e 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 up by a wire at each end. The scaffold isr(tntdp u8q-1 18 m long. A 650-N box sp-dn t1 rq(t8uits
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 th ; b*fd94x4u8eb dn2)vjwojcg e 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20- o4x db2uwjne4 8g9)v *fjbd;ccm 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 ony 3z2;:ztv 6kz-t nion 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 thrent2n;-z kzy:i6o vt3z e 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 of2rscloays 6(xot 6 n8. mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the right scale reads 30.6ss.ol n x6 rcyo2a(8t0 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 connew vrnwgcn/7cvjrn: 5-/m d-w5 cted 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 vr5dnc g//-7wmww rvcj-n:5nhas 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 kghk;rd ,jehvh9wo 3e 89 and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the9krhe,oj9de;h h w38v 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 whekk 8)v:t yr2lf l-nodxxpb*4/ o6-alfel base width of 2.00 m. Its center of gravity is equidiv ll6 rn)8t 4l*kp/bdoa-y-of x:k2xf stant from the sides, and 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 offxw lvs-5; beq8f3 e/ ep11ypo Pisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off cvspfee38e ;l fwq11xo /y-bp 5enter. 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 b7leluo8 y *6bnz;xr) lh03pzhy 0.0025 cm. How much force would be needed to compress the block by 0.0125 cl zoyx6*pz;0rnh87 le 3hul b)m?

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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 x2ti;o1*e pf3 53hk(wbu btsga 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 s0( +t s)o oc(*yh7xl bsoduj2itation is 4.0 m long and 0.20 m in diameter. Young's moduux i( c(ojbdh7y2 *tl)sso0o+lus 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 appm1xm4x a;v(xclied. What isax(mc;xx4 1m v the elastic 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 dia1gccx. ym6*sg meter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus for s yc*gxs6c1g .mteel 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 supports all his weighto8g q) vt8 iog xue2dhyg*)(j9 on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted o)8vgegi)y9goqj out 2 *(hd8xn 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 ar-zsg: rmuwu5 ukd fek.(y(7dng.ns)8ea 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 ml;xtz. z-un gg-y+g m2 in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminumnlxgumgz t2-zg+-y; . 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 lengthkqzt( z3xo*)dy a43j u and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus f 4 zzt3aqudoyx (k3j*)or 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 withlk nd66kzl6y g,341xinxu v9l sides of 30 cm. What is the resulting relative displacement? (The shear modulus f i6 l3vdn46knlxk6,gz xly91 uor 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 prb a. v or8j6mgu:r7e9rjmm.7 wessure has increased by 100 atmospheres (to abo bar7jm:mr86 7.9j weuog .rmvut $10^7 \; N/m^2$). 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/v5ge p x.gck0vn*d4worw n(vmb-+o 5 strength of steel isocv* x.(gg-mrw vvo/b+kn4ew 5np0 5d $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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