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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 necessary for rotational equilibt, 1/f;m jlj8iqijr5piim)5brium?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What condition or conditioz531+m+cv zpp3 am hpins are necessary 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 aw1oxe;6 .v7 kl fn3dqit rest above your head the net force on the book ison7; fve.ikl1 xq6dw3

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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 con:r73l6hy)- 3esy zu(e3tv harvczqb3 , vwj h*stant velocity of 9.8 m/s. What net force acts ebvh3-y 3 l,3ec73)zr:h qways*j6t( zvuhrvon 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 Nts; n76p 8imxo stands with one foot on each of two bathroom scales. Which stateme on8;t6mx7pisnt 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 ligdcfbn,fav s p gqgk62,zp u48zk268k (ht girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, whatk 2bfk gaqfv6u4gps 8(k d6,zz 8p,n2c 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 lx)pkrbir( 1 c 7;+glwin

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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 bjo 2s8wlhuke+tjj5 08o.gs6 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 dimensipjc1ucb1yjz0cl sx9i 6 vc+-3ons 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 d6j9v c-zc 1x+pcby03ujscl1i istance 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 byhl gckf oa6l( nc 7/(7:u, hv45kll1rd dart6r three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between tw4/nrcg l( ahk(:6u1vr76olt a,7lrk fdcdl5ho 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 of aluminum, braabzzcc g;4 )/iss, copper, and steel. Whicib;4zg c ca/)zh 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 wh2:6dzsjldku5 en subjected to minimum tension of 36 N. If the wire diameter were5ksdz6 djlu:2 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 componentyd :j3axkiq;m7z/v;-p(n z uo of the buttressing force at the base of a pointed arch injz7 pv: zq; -/oimdau(x;3yks

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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 weigjhu. p .k/k:jd/ gfzi4sd xx1*ht to be lifted is 1.0 m. If a worker pushes on the opposite end witj1 zx:pkf./x . gus4*id dkh/jh 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 distku9st-x/:o c n2 xd8baance from the fulcrum to 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 l: 8 -bk29/sonxatd ucxever?

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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 mx1f fs,90k2kp/ zqfecassless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 mk/0fq2,s 9 cpeffzxk1 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 oppositel7wayb) mw1 e7 ends of a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B h7)maw7e ybw1 las 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 welid,2jii robl by0i-.o, t/5right 40 N supports two children weighing 500 N and 350 N, respectivei, ,20-rtrbdolo lijy/ i i5.bly. If the support 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 id o+2quxe7 0srs supported by two ropes at the ends. If a 400-N personur0oxs+de 2q7 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 is07jtjw eqt /,neomi:ju7 53 p:g cwu9s supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, whj:0i/ 5jocj:u q7g,s w7 mn ttewue93pat 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 a6x*0/ (priyfatrx)gryrt+ y0 4s d5qm wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is 0m *5y dxrs6p(a4r+r0ttxgfir) / yyqthe 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 -yi 5l-0g;fj ,h5q fqazkqq 2dheld up by a wire at each end. The scaffold is 18 m long. A 650-N box sij5diyhf;-g 0k a5-q2lq ,qf zqts
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 sup7p)m *bu 7lu z,wyixd: uk3en8ported by a 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 mark) should a third mass of 0.30 kg be hung to keep the stick ii,d m w bzl37xn:y7)k uuu8e*pn 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 boa r6zib z;if(iz)xd42yf(h i)5j:osghrd of weight 100 N and length 8.0 m. The board is supported at each end. If the support force at the right end ig6h45 2ij ifzhfzry)di( ;so xb)(:i zs 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 placedk;b43*)z+3 uqdkyklmhkeoym ; i)wy ( between them. Each scale is observed;h*iq oykybe4z +w y3k kk()ml 3m)du; 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 h)rw7 i5xf4 )p 4oamwzand connected 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 horizoni xo)5)4rmh4pwza7 w ftal. 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 annp(ka4 hy4rm+c*xw vt1(bu9z d its CG is 12 cm from the elbow-joint pivot, how much forcepwy b(cx1n(ta9k4 v4 hu+*zrm must the extensor muscle 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 width of 2.00 m. Its c bnk5/1uu h aop*k:4jkenter of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which it can be inclined without tibuh5up k1 :a*4/nk jokpping 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 iaks 36f (/azn5(.oqgzhiu9ig s 4.5 m off center. How much farther /o zafh5g . u3n(6 iq(gkzais9can 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 b0a5mngp)l1c q/*r4 p0s xqdeq lock by 0.0025 cm. How much force would be needed to compress the block by 0.4 d0 sqpl p01rxg cq*/)nemq5a0125 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-sexk+88et;+p+ i)m+ fv ixabijp;wm2fuctional 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 0.20 m (56cy7 nc bathin diameter. Young's modulus for s6 y(c5thabnc7teel 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 6.28w- bn fnp6)u2b-N force is applied. What is the elastic modulus of t6w-nu)n bfb2 phe 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 khc y,6( t3b)v5 9sauyr0zihu n)x j)ulength 11.2 m. How much will the wire stretch? The Young's modul 9 y)hbnx,yh6 us3t5 j()a urzvuk0i)cus 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 c r n5rn,fhgl:5rutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is e ,5rlgnh f5r:nxerted 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 area of ic, ;d/u)issz $1.250 \; m^{2}$. 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 10iwl, ;(zh el1kyae2ro u,h fr4;o( /xe.0-kg mass. What is the stress in the wi1r; eu ewxl,2z,o /kh4(hof y ;iear(lre? (The Young'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 10.0-25g vng9n, a2cmmt+kvkg mass. g+ 9,ktmcmv25 2a gnvnWhat is the 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 h/eo 7mo 78b(i9ioyzacube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for aluminum is e7 (/om7 yahzobi98i o$2.5 \times 10^{10} \; N/m^2$)

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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 hjs+u7z6dz 6 jv:mg+kq - *bxphas increased by 100 atmosphe j+ g+z6husv:-6zb7j d*pmqkxres (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#
 
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  A 55-cm brass rod has a +(bnmzq.p we ;;+iqzvdiameter of 30 cm. The compressive strength of steel is n+b. pz+w m;z;iq( qev$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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