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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 equilibri2;n guqszqe*j k ,ovp/37 lxdg+bj q.5um?

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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 statiz* z*be1 9vekmc 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 th(mxv9 xobt03dh2(z dg e net force on the book i o2v zx((3t0ddhxb 9gms

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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 constmktg9k*n yl+ .p,t o5gant velocity of 9.8 m/s. What ne*p9m.k5y+ogk , ttl gnt force 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 800r37hsx*oftqj5 :d ,fh N stands with one foot on each of two bathroom scales. Which statement is definitely,*x : 3f7shftqhroj5 d 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;5fp5aezn+wcd4r ( skf+f-w u are balanced on a massless seesaw. If they both move forward so that they arfr-u4 pzfnswae;c d(w5+f k+5e 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 eg 7)n hsj03exgnd is 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 horiau 8vj8vmgpq. /vkt r385o+/9ul zhw5xl-uby zontal tabletop 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 dimensh )4x 4zskvb7o5vnq,iions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is then placed o45x,74sv bn)h izvqkso 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 ew )ix) 2yd; qrko9wi:legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two qeo2)x i:wd yir) wk;9supports 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, brass, copper, 1:)omfv+ forradpj ap. p4c *ui/b7 d(and steel. Which wire will stretcap)df* 7c if.d/bvprm( ajp4 :uro+o1 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 ,-jsg*us0 zbt to break when subjected to minimum tension of 36 N. If the wire diameter were half as us,*t0b- gsz jgreat, 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 arck 7d .+65 hwkj3d)tp jjnn06xwy) vauch inuh)djj3jat kd+ y56p v0w.)n c xkw76s

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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 distanrgwp g:32o4 uv muu2ri05azh/yhm1n,ce from the fulcrum 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 weigh5m0rn:wu1imu4 ygv/p2a z,r2oguhh 3 t 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 dista qu/iq,ty xn,;nce from the fulcrum to the weight to be lifted is 1qix; /qyu nt,,.0 m. If a 3000 N rock is to be lifted, 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 mas+gv9 yrb7pyosm 879(egeju /z,u4 zxdsless 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 one si sdy+jzy9 7be 4pmeo7(8r9g,xuugz v /de 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 w:8m5 - om(5gqti i(dswsag6te xhouw/:( ,c sjhich pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has d 5g ,uwgam 8xw(tihmes6c:(/jqoi-(ots5:s 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 wst.; bb15kqfzeighing 500 N and 350 N, respectively. 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 fskqb .z;15bt350-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 ropes at the enu8hm/igh; 3kck6 y;veb lj)6 nds. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in 6ihu)8vh;jkel 3c6 gbyknm /; 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 wexah +7gy iz8 h:g9.r7v 76spg,rpagpxight 100 N is supported by two ropes at the ends. If a 400-N person pphgz,6 9gxpag+v ragr77. 7y8 :hixssits 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 aq)x,m k i+n.gt wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in it,qkm.)xg+neach 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 he ezxfwx/gsmhll1pk/; m + dmrj /(.8wuh:f .y3ld up by a wire at each end. The scaffold is 18 m long. A 650-N box sm.lx/g+.fmd( h8f1 :yj ;h/mprzwsw e/k3l uxits
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 grc+,s o5z/o t+ v9g3fbq (: uy1guocrsupported by a knife edge at the 50-cm mark and has masses of 0.r qg, oubu(3ro+cgc /tzv yfg1so 5+:940 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 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 lengczr, ::z c abua0h*(qhth 8.0 m. The board is supported at each end. If the support forcez: ,habah(uq 0cc *zr: 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:;of(blrq0 k izax 0)jgx4 ed; 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 the plank, after which the right scale reads 30.0 kg and the left scale reads 50.0 kg. How far from the rgd4k;i)e: x(; zjxrf0 a0o qblight 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 separ. 4x8n(nn uvibated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway beb84.x nnu v(intween 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 kg and its C8imv (xvlrfwp53ozvp o. w0ip04r3n 2G is 12 cm from the elbow-joint pivot, how much fori o80. wvwvm zrl0pnxv3 3 p(por245fice 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. It(8og9i03* sgk u0ea*sshb fp x59cguvs center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which 0 e0 g*3fs*vpgai5okubchssg(u98x9it 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 5 )snyyi y-5bm35 m tall and about 7.0 m in diameter. The top is 4.5 m off cent) ims-by y3n5yer. 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. How much force would .)xugkq0q)rfxz * 2bq be needed to compr0) xkfuq )rbq.q2xgz* ess 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 asz96ao m1bg g2 cross-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)i rp6n(30lqezq b2va and 0.20 m in diameter. Youngv3b0plq2) rieqa6nz( '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% atxe59lu*5cs wn +w 7ewhen a 6.28-N force is applied. W wxwe 55lsanec ut*7+9hat 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 susp f7bmyy 5 f7)q961 g,ilrmvux0cqli2e ended from a steel wire of diameter 1.0 mm and length 11.2 m. How much w g 75l6 qrfyx7,c2mvi9fmb0 ilqe)1uyill 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 walkls)cb)sieor vqt5x*0dj0 / j7ing on crutches supports all his weight on the two crutch tips, each of wx jb0l)*5sq 0vets/ j7c dior)hich 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 area ofy(h;sdt.1cq*9: huv n: gxief $1.250 \; m^{2}$. 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 an + n0lmn kryw:;o5(kd,ax yzc v3fpv7,v2mpt5d 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's mod0ydtv5m7 5k na3pxcyzov ,( f:wmk pv;r+2 ,nlulus 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 dmrc: ,5+hd1cgowchjx;uqx*oluw*;9 0r j9n aiameter supports a 10.0-kg mass.wxxa1r:mco*d5lr h+qgjon0hu *u;c ,w 9 ;9jc What 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 g gwhifme/am-):cf3j) wr -m v/j+br4one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus ff4aifw/m-m- cb m:w)hjg3ev) +rjg /ror 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 incre 3 ct;a/3;ehmva hxqme(c sh;3ased by 100 atmosphereham/3;exa t m;s3 ehcv; (3chqs (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. The compressive strc5 6 5a4rg+/zk axu zczk6izb3ength of steel isbc6r3a/z64 5ga xzz 5+uckkzi $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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