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习题练习:Physics Unit9: Static Equilibrium, Elasticity and Fracture



 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 cov;y/+kx rs 1*6p0 hitx 2eagwinditions 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 necessary for static equilib;j +mjtkx jn, ix:a/+qrium?

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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 the net force on thefc)gliuys im*c3f5( r*i ( ,cu book ,iuc*ciy3 lmc((fgfs)u ir5*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 constant v; xm,nsyuer bqaen85e4; b0adc. ar31, p)vhu elocity of 9.8 m/s. What net for.)aebuuan 04rsnameqr8 hx1v5 ,p cyb d ;;3,ece 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 on: bbkz;np1 h9*j*xe cee foot on each of two bathroom scales. Which statement is definitely *ce xk1 ;9e:zbbnpj h*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 balancupde+0mi)+ guwov496k+.lbx mwvw z 9ed on a massless seesaw. If they both mo.uuvo+wm+id vz+lk0p 9)wxbw e 964mg ve forward so that they 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 isj+ htr/x) eye2 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 tabletopm7 f/z39 eijih 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 qixx;0yb;pd1om/ +w k 20.0 cm x 10.0 cm x 6.0 cm. One is stacked d0xwbo+y;qk/pm ix ;1on 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 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 s3 piu4hj+wh:4l j*ig 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 tab +hpsgi4wuj34l ji:* hle 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 ia8srv ld3c4ed *a9v i:dentical wires made of aluminum, brass, copper, and steel. Which wire will stretd8ev *vr3:c9il as4 dach 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 wherj55fr hxvu 272ju fhk 23hh4tgvn()xn subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect tu )htuff2hrhxjk3j75 v4 (g25 hn2rxv he 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 pointe8qd4 k l9f:aedd arch k :dl49a fe8dqis

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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 futtd c.1n)dn:wriq( f4lcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that cdn ()q d .1twr4nt:ifcan 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 li3 *1xw k.0twmk3dg3 .a (pugb rrkd7dg ufyv,9fted is 1.0 m. If a 3000 N rock is to be lifteugt9.m1x*pkdwg v3dw0au3 rd(, 3rf k7gy.kbd, 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 mas1rh vcn zz3ns 3:fs.*ws of 75 kg and:r*c v3.z1s zfws hnn3 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 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 s2a+wx x(m59r s mw:2 xtbh*;wcs hxc*phn(j1ieesaw 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 the center must child B sit forxw(xhasmh*sn(jcx22x*1cwt95: p m biwr +;h 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 tl;qk: pjbr o-sf.7fs+ wo children weighing 500 N and 350 N, respectively. If the support is at the center of the board and the 5007.j;rksffp loq +-bs: -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 rophd*mojdg +2d ((4arstes at the ends. If a 400-N person sitsr2d(ot*g +4 m(d hasjd 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 supported by: nq+ec4o3zwm two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what +o3c ze nm4wq: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 hmx -zr mx+d1wis .8p1w/5v6oi3 tmcl seld up by a wire at each end. The scaffold is 12 m long. x1m3mvl i5op sxd w-sr+i /.cw1mz 86tA 300-N box 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 held up by a wire at each en 0k41o9zn,bkob nhr8 md. The scaffold is 18 m long. A 650-N box sb 4nb1orn89,kzk0 m hoits
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 *q snr9zu ca3fuw;) k*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 mcr) q3kazfwsu *;*9un ark) 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 on a uk-bl :s,-,sjirh1aqf3 sa +i eniform 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 ijlasa hrk,3iss-:q-,+bef1 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 separ 03ni y.lxfjh/;)gdiu)a8q jbated by 2.00 m, 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 lay)jg;fq0 udi/ ih8 x3bj).nthe 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 / v*3 x5sf8r.m-nxf- bbupyqv by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the*-ybx -p.r8nfvu5 vx/bmqf s 3 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 mass of 2.8 kgps 9;3 0jkxs1hg ztfea0li 97r and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower asj9f7e kxgs9rz0t103lihp ;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 w7nizwp l2y lzqi xho(.o/ 40s4heel base width of 2.00 m. Its center of gravity is equidistant yi7psn4 ol24.ohwlzz0i (xq/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 of Pisa is 55 m tall and about 7.0 m *4leikva d kwaft (n +lt04)1lin diameter. The top is 4.5 m off center. How much farther caka l4vl+ttn( i*a)4lfw1ke d0n 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 fs-:h cd /x.bdworce would be nedwhxd :sbc-/. eded 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 cross-sectional 93s:ksc. quav m)/*oq 3v mkararea 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 statiod 7qg(8 8sx0uvufp mk(n is 4.0 m long and 0.20 m in diameter. Younugv(uk0 xf8q 8 p(dm7sg'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 a 6.28-N fodce ve4;mx(j3rce is applied. What is the elastic modulus of the xm j v3e(;d4ecwire?

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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 otc7 f azs+ cer,b ;8-*qzegd4vf diameter 1.0 mm and length 11.2 m. How much will the wire 8e4f ,zcbazste;7q v+ *crg d-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 suppornfbfmpn0i, 3+x wu5gc6 *llv/4nzaq+ts all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What6up53vw znla 4fi/bcn* + 0lq,nxgm+f 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 dlq(gro*n ozwoxe i94j)w6mkk x 0u; g)s8o/2an 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 q.3m8o64 tb kgf)fgixnt 3 y/xin diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for axotyg x83/n46 ifgmq) .tf 3bkluminum 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 2w jyip nxdr;2 l-59o*qchg,b..0 mm in diameter supports a 10.0-kg mass. What is the elongationx9cjy h5p r; ,2n-.diolq*bwg 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 alumiy ljh0pgdl*vua;x4c1s54f f3 num cube with sides of 30 cm. What is the resulting relative displacement?0spj cafl3guf xdl145;4yv* h (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 /9q)/-:agz v7 cz3cody1xfyce rnz ;j1030 m in the sea the pressure has increased by 100 atmospheres/yzrcqca1)y; o ezfjz /v7- xg9n3dc: (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 of 30 cm.6 nun-xn4* 8;fldybt k The compressive strength of steel is ;tlb4-nnun*d8y f6kx $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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