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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无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.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://autoconfig.5edu.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: admin    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 condi+cq dde:8op 398vh 8emrgzd3u6e-cs p tions are 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 conditions are necessar 236 brvq,x-eqxsq3pdy 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 resxdvx;)54g6buh ys9rtwn p8o( t above your head the net force on the book isyvw5h)p9 bxg68o4 ;n t(drux s

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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 :w r4 t3-djqutvelocity of 9.8 m/s. What net force acts on j- wd:rutq3t4it?

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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 7dil,obls/ d o- kru8(on each of two bathroom scales. Which statement is definitely truio,kd- s(d78ubr o l/le?

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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 mafdhw ,979 pzuwssless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to theph7fw uzwd9,9 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 / a5x jndf;)bq vqkvz,vrg.(9 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 ta h(9.wyw ;dmbjbletop 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 1s1zj: ; u ajew ro;sc/8wh euch:ym/)30.0 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 distancee;r1/jchjas3 /e uosum8h:w)cz ;w :y 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 plabk7n8n3wb9z9zq r 2mbced equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the tab3m zz8nn k9q7 w92bbbrle'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 made of aluminum, brass, copper, and steelvlfxwfp to ,b 5l.;0kl-0n2it . Which wire will stretc fp5 vl2xlfwi ,0o ;bl-0nttk.h 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 ten(m5b vca ew34qsion of 36 N. If thv(qa45mwe 3 bce wire diameter were 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 the base of a pointed y(y7:v9i) fszf h*wkzfrc .2qarch hz7izyfs 9v kc:r.fqf)y* 2(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. Ta* y2t1t azf0qhe distance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite ezta20*y t1 qfand 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 the0eb )w ypo0z1n weight to be lifted is 1.0 m. If a 3000 N rock is to be liftey0 )0ne1 zwbopd, 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 t7z*c g16upaybalanced on a massless 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*6ua zc 7t1gpy 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 uniformww-r3 3*s uxg5+*juf ciez y.3 xfzor8 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 thruzsx * . e5fuwy3o*8jwi 3 zxc3-g+fre 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 and 350 z j :/nua26fdaN, respectively. If the support is at the :au6j/z fnd2 acenter of the 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 is supported by two ropesd yl ohb0*n,r1rr 3y2p at the ends. If a 400-N personbnd2r 1*0l3r,hp yyro 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 su9r/jr pae t25xpported 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 right r p eta2rj/59rxope?

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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 wttx ;rd x.-,rnire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m froxn,- t ;x.drtrm 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 uph* z qda,8m;)ghr:fh:b hs9n u by a wire at each end. The scaffold is 18 m long. A 650-N box sianhs:,bzqu;g h*rhdf 9:8)mh ts
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)ot,y lb;, chae0bp) f 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 kee) t,p coal)hbf;,by 0ep 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 lengt bj 7tgxb m;tdg9ol35tsgo8i)bw 4u76 h 8.0 m. The board is supporte 6g ) 9biotx5u tmsbow874;g3jdt7blgd at each end. If the support force at the right end 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 2.00 mld3ud, l/ +n68imfay p, 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 the plank, after which the right scale reads 30.0 kg any ad3/6f n8,dpul+ lmid 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 arbjlw3,k 67yehv avh;1e separated by 40 m and connected by a wire. A bird of mass 0.50 kg l;7h w eavy,6 ljh3kbv1ands 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 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 mass8 p fvvo6(;b fo.b-gzd of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the u6vbf8z op( gbd-v;f.opper 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. Itme21 tqf 2gkn/vwd- (: iy6hhis center of gravity is equidistant from the sides, and positioned 1.20 m abe2-mwnfvhh :1qii62 t(gd/ kyove the ground. What is the maximum sideways angle at which it can be inclined without tipping over?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 +qdd63rzr(o b1x +bcjm tall and about 7.0 m in diameter. The top is 4.5 6obc+dbz(q xd1r+r3 jm 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 0.0025 cm. Howd*q3ce04x hqoll ,o 1l much force would be needed to compress eolcqh* l41,oq3d xl 0the 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 cross-sectional area b)62ld ,rfjy2evfg 0 uof 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 in diamethop zyxjoy8 (j,; w+kxzu(z*h i/b50 ver. Yoz;w kzjuz+( *yh ,b jxx(oy8h5/ip o0vung's modulus 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 ayip75( :f oxns 6.28-N force is applied. Wy xoif: n7ps5(hat is 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 diameter 1.0 mm and lenfryhzx5g030nd t m lwefv(u x(/74nt3gth 11.2 m. 0u3 3/e wtn(mvd(7r0fxg5tlhn zy x 4f How much will the wire stretch? The Young's modulus for steel is $20 \times 10^{10} \; N/m^2$.

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 pehm:h s5uv/mu8 rson walking on crutches supports all his weight on the two crutch /85 vm: hushmutips, each 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+kch nsv-5(jg(lo : jn area 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 supporqo)s,v;*,diav)i sk t ts a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum is )aikv q;*i o)d ts,,sv$7.0 \times 10^{10} \; N/m^2$)

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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 supportto*ie n4 2z2eos a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for azt 4*iono22ee n 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 alumin ex9,sal)n4 vzum cube with sides of 30 cm. What is the resulting relative displacement? (The shear m n l9ax)esz4,vodulus 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 increask+q c6bxq86,xab i o7sed by 100 atmosphe867 s +ix,oxbkbqcq6 ares (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 diameter )0ikm/(1rqi a9 wlahj/fo*yl of 30 cm. The compressive strength of steel is9 ok)iyq0 *1/mwhjfll /ria(a $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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