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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
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 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 necess0- r+waml:p f8dj8-9uezsp mgary 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 ne 2kwn e3(bmli(cessary 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 the net forceo4d g 19t9hrpcpys0w.:lf9za on the book i.yp9od19 rh4al9:g0z s twcfps

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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 constab/zva, aoyvn)huf *h;h -4;ernt velocity of 9.8 m/s. What net force acr z4h-v;)*,b uv;eaho f hn/ayts 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 6spj nbbsc76*6bw 6 mm/ihyb0foot on each of two bathroom scales. Which statement is dm m/sicy 676 bbbh6p06nbjws*efinitely 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 gi90o( ld -zacry2j 76kzrqepuw /,d)jb rl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will haod j0d6e7z,p)zk9 crwj ua qy(lb2r /-ppen 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 inouk 4le)+l2 ir

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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 is inp 94jsoeq4h8m

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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 dim7*gere;kv:j h *x g7ccensions 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. What is the maximum distance rxec7c**:kjg ve;7h gthat 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 equal distances apa/vr ig ol1pi4e 6+4hqp2 t/r mvsx)u1jrt on the edge. What minimum mass, placed in the middle between two supports on the table's edge, wi/2e 146vv+r m)/slxr j1p4tphu iigoqll 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 identjcw49edu q ()aj/ i)iyr5gst.ical wires made of aluminum, brass, copper, and steel. Which wire will stretch the ljs )5cd/wruia ei 9(gq )jt.y4east?

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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 l:.zc j)sld * 3g:p wu.xoylg/when subjected to minimum tension of 36 N. If the wire diameter were half as great, we woulpglg/)sl *.o dyz:xc.u3l wj:d 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 kq(goyc6 k d/bfb 6ecv(0 dr,-the base of a pointed arch ivd0 ygkrc 6b/ o6(e(fb-cdqk,s

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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 tz0bos +gxem8+o be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that z+emxbg 0+o8scan 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 liftoun rkxodnj3q v jx i7+:a8/ --85aczued is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on the lev j aoqci5u o- /nj8uvk:7x+na-r83zxder?

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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 mass of 7w11vzht cx4/b5 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one side of ttc /bzwv114h xhe 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 in the centa/vu03th)s rv er. Child A has mass 60 kg and sits 2.0 m v03v)ru/ ht safrom 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 supports two children weighing 500 N and ;gdraj.b7a 5 72bu jxd350 N, respectively. If the support is at the center of the board and the 500-N.gb7a5; ad 7dxjr2jub 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 tw tg0)q(n i8f2aa9fclho 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 (t)2 9g qnlaci8 ff0haleft 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 10k2:2 zp u8sb6j gta4qc,x1jv r0 N is supported by two ropes at the ends. If a bg r:,ajv8 sz21tu426pc jq kx400-N person sits at 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 is held up by a wire at each end. The scaffold is 12 m *q8f;af56jg0jh/r k+hs3sbo rx3bknxg ) tq2long. A 300-N box sits 4.0 m from the left end. What ih/ 3s fr8n qqj o grtxj2sx03ah5k6f*)bkb +;gs 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 wirnm6 tm8rpvm70+v-xy ze at each end. The scaffold is 18 m long. A 65zmy-786rvmxp+ n v0mt0-N box 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-c 7kx gycq1)6rkm mark and has masses of 0.40 kg and 0.60 kg hanging at7)c rq kkyg6x1 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 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 led:7p(cy fcv (bngth 8.0 m. The board is supported at each end. dc(pyvb(7 : fc 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 m, and a plank of mass 4.00 kn d2hz3;rq7m gg is placed between them. Each scale7 z mnghq3r;2d 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 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 connected by a e9/ wl 1s gdqqb0nbqy8v7g;k0wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0 m below sn1b879ye 0lkgw v;q/ q0qdgbhorizontal. 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 its CG is 12 cm fro*-su am:fq h-enztj(sle5 *8leok0g.m the elbow-joint pivot, how much force must the extensor musclf *le:0hsmzuke o* n-e -gq8(.l5ajste 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 widtgyl-k 64s8: zj3y/bcua7dr gsh of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the grou b3s-7z /8 ya:jylr ksuc4gdg6nd. 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 krkieu4f( 0w( tall and about 7.0 m in diameter. The top is 4.5 m off cek4u (f (0kiwrenter. 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 0.00:sj w j1vxb- 7gh6fbjyyy5ej:+7c6 ok25 cm. How much force would be needed to compress the block by 0.012 7kg wo1yh:y j-6 xs+fjy :6bbv7c5jje5 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-sectiona lb3c) ;;rtd,sz -ebgvl 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 lond8ya:(ieh u1v43e0 jgw h- ytt 7ime4wg and 0.20 m in diameter. Young's moduldw7 yhu:3i mt1 e4 40yjtgi(a-ehw8 veus 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 :0 yc2 2or2jr sclclsv2 :hh53hjuj+q6.28-N force is applied. What is the ela+3so2:v 2h2jrcchj jr lc 5yhuq:l20sstic 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 o(u8hyt.2z lo5tbj w+ tf diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The z5tt28lbjoh.w y+(utYoung'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 pehj 2 )0 av4qaqk*,nswj;i tvv /mn8gcm.mzr:)rson walking on crutches supports all his weight on the two crutch tips, each of which is circularh. *vm wmjqkiramj0)4v2:n /8va) ;szc,q tgn 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 areahe/ ilh6/z9rffa0 c2p 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 10.0-k z4k6tkent -i/0,bw hlg mass. What is the stress in the wire? (The Young's modulus for alum/ 0n,kt zeb ikt6-4hlwinum 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 lengmm w+0 y8hh+rcb+ ;pywth and 2.0 mm in diameter supports a 10.0-kg mass. What is thcmy hh; wpb+wr+ m0y+8e 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 N is applied to one face of an aluminum cube with sides of+(;iuc 1bzxbp 30 cm. What is the resulting relative displacement? (The shear modulu b(cxp1 i+b;zus 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 increased by 100 atmosph2*drsk-apcwq2+r7+3n 0j x xdmg+h fberes (to b+c2 r7 fwn 0xmj2d+h*r+-ga qpd 3kxsabout $10^7 \; N/m^2$). 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 compressiv tn.0c-l i)u ynh5f2ble strength of steel is y bf2-u0 nnl.l5ti)hc$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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