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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://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://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 equu7o sjj2p9bj5v4wj h) ilibrium?

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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 necessa5fo/b,v4jj(ak; uf- bia he4 mry 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 thewuxr 7+f0 cdk1 net force on the book i7+u0 d rkcw1xfs

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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 vel(* d2qhe(ns:z6 izdptocity of 9.8 m/s. What net force ac26(ez( stq* ind:dzp hts 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+ z xalebfk7+ 6komj9e** sa0y8o)eow foot on each of two bathroom scales. Whiczflk * ow68 okmesaa+x0 +oybje )7*9eh 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 light girl are balanced on a massless seesaw. If6:ium k tzs)d1 they both move forward so that they are one-half their original distance from the pivot poi)u1k:s ztm d6int, 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 c 2cyad:1q5ql 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 tabhmvkayz9ry * fm dm*:jv:5yldj,n *--letop 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 identicaluw8t 4c i3ax0yov-y6 a(yurs) bricks, each of dimensions 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. Whawytyu-is r 6cxoua )a(yv83 40t 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 7 2+wktzzg2rv -qwi1t is supported by three legs placed equal distances apart on the edge. What minimum mass,iqzgkrt-vz2 72 ww+1 t placed in the middle between two supports 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 identical wires made ofgi8dl (m5q1bwnl (9t o ,1fcjd aluminum, brass, copper, and steel. Whichq5lfm(i1nljc,9dd18g b o( w t wire 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 whenlc7g):/gil ke subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected tc)egkli :gl7/ o 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 foxvd(kd w/q8l ;rce at the base of a pointed arch isd/ q;( 8wvkxdl

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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 liftwof-dozt9t d1 nw7w9fjxe f-/qi lq8/r,n 4; ped is 1.0 m. If a worker pushes on the opposite end with 400 N, w,pj f1 79eq/n9;/4t dwnx izf-doq8 lwt-fr wohat 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 weight to be 6voo9ag45uux qxes,4gc *cj *lifted is 1.0 m. If a 3000 N rock is to be lifted, ho o, v*g9cx6ex* ocqgu5ajs 44uw 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 areznappdaa 5,8k8 *5d jp balanced 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 frd5a* zpp ,k8ndajp a85om 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 whic ;nmv8mmg8;ueh 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 fnmm8 ;8ge;m vurom 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 and 350 Np5cr+.p rb+hv, respectively. If the supportcp+rrv.+5bhp is at the center 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 :wyq os;f:c5xis supported by two ropes at the ends. If a 400-N person sits at;w:q :fscyx o5 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 supported b/ til6olcm5g1 b4eji ,y 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 teni eijb4c1olt5/gl6m ,sion 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 a3fzef5h51d v f3par:/r gwl(i wire at each end. The scaffold is 12 m long. A 300-N b(3aefzvwpgh dr1rf5/i:l5f 3 ox 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 held6zv:/kg s oyko+mk 8of 0s+a-g7nx;pc up by a wire at each end. The scaffold is 18 m long. A 650-N b8oy kg;pfkg v ms:0-7+ cxa6z+okno/s ox 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 knife edge at the 50-cm mark and hasn9 rfbkr. s:)o 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 in so9r.nb:kr) fbalance?

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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 h z;yu2mn1spem(ur,w :n,ms3weight 100 N and length 8.0 m. The board is supported at each end. If the supe,ys(u1ms 3m zup,:rwhm 2nn;port 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 m, and a plank of mass 4.00 kg is pla:zvd- 2nppju) sz;t3jfze7l +ced 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 and the left scale reads 50.0 kg. How far from the right scale ie2 zvd;)j fz7zjtplun-+ :3sps 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. y1rrxv ne5exl6/5t zfx / 1pf;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. 1 erfr16xp5/5tnzexv xl/y f;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 it,rits6(liw8 d;zo 0d ns CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to holldii6rto8zd0s (wn ;, d a 7.5 kg shot put (Fig. 9-1)?


本题所包含的其它图片:

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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 gravitca3k +f-jxux*v5r nqjz6b13 u;*mebmy is equidistant from the sides, and positioned 1.20 m above the ground3cm-k5muv*xa*;fnxe 1 3jjbqu 6z+br. 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 7.0 m in diameter. The top kgv- ,euabr+9q(vkdvbz (98iis 4.5 m off center. How much farther can it lean before it becomes uns(+ q9vu8eb i,v vdgk(arzb9-ktable?

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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 b-hm8v4 0i,tw su7 sb3+qg vv gulsb18sy 0.0025 cm. How much force would be needed1sqvbugmu8-s3 wvh07 s 8stgi,4+lvb 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 has a crma1 1kid)qjy-nys a5usu ane;+ )0bj+oss-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.(z i9sf -j-jdc20 m in diameter. Young's modulus for i9f-d(c -sjzjsteel 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 0.2w3zd4 9ljuv9q4 s4vk e: td2rk0% when a 6.28-N force is applied. What is the elastic modulus of the wite9wd9d q jv24l3ur4vzksk4 :re?

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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 ;r hobn+7;pza .t zi/a1.0 mm and length 11.2 m. How m p/arhn;ia.o+tb z;7z uch will 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 walking on crutches supports all h.ud(yy/ lesvs+4 ahl *is weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What prvd /sslhuya4.l (ey* +essure 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 yx9*4bgva, g7mw d0hc.f zoc ;:6wr jaarea 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 asdut 3sr+(4w:0bfwl :wksq;; j8wgm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Youbslra 0ktgw;d+4us( ;m 8:3 w:fsqwjwng'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 supports a 10.0-m0rd1:7lbv ev 3zbxd( n+( ezdkg mass. What is the elongation of the +1v(0r7 lbzx(zedn:3ddev bmwire? (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 anp;qv p-u wa+rnr: lkeq6 98cx zjf4:u3 aluminum cube with sides of 30 cm. What is the resulting relative displ 89qf kl x4+pc:pz6 qenuarv-wjr3:u;acement? (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 zmq jl4c.t4+q 1030 m in the sea the pressure has increased by 100 atmospheres (to about z4m4.t q cqj+l$10^7 \; N/m^2$). 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 strength of svg3: sm)8*rtpu*ym y pteel is yy*3mv)p* g: upr 8tms$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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