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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 conditions are necessary for rotatio9q q1;j:gu hmtu r:e;rnal 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 necesaho262bl 5c q yk/;of zc7vo5nsary 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. When3ph enx .jp05) ualw l)xb z:tycm;*x3 held at rest above your head the net force on the book is zm)w;ph l e*paux335y0. cl:njx)bt x

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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 velocity of 9.8 m/s. What 74x9im2vo hy vnet forci4 h9x2yvm 7voe 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 withl em( jz*4e5s 4gcun y: k;wd2/px(lno one foot on each of two bathroom scales. Which statemenn54c d2e u4l/j(sg nyw( ;kp*exzml: ot 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 1aq-icprxu p.to;(. don a massless seesaw. If they both move forward so that they are one.q(i;cdu o.at- pxp 1r-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 8onyhe7 x,nhgy w741dend 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 horizontal tabletop is iw +tmwr4 tpb -q/0u5mwn

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two identical brinj xv7q+yg3h-67hvv gcks, 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. What is the maximum distance that the end of the top brick can extend beyond the table edge withouqhh gg jv7v- 3+67vnyxt 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 apart on e28 wdt)6dhxi r5xm/6lx1fsy the edge. Wh s2xy56wlx d edhxm6i/8r) f1tat minimum mass, 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 of alumiz/v zwtxhz;2/o p x d/-5rbddbm 9l*0hnum, brass, copper, and steel. Which wire will stretch the least?/z /xzmz h/*dw bprddv9o25tlh 0b; x-

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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 g1lr srl 6 llykb7-,vo2-.ctx to break when subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expeck v,t.y-xgscl 1b67r-llor l2t 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 point* (u mv7vs-jeqed arch isje suvv7-q m*(

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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 fulcrumbdq k6pui0z +ro3c* g+k +zqr( to the weight to be lifted is 1.0 m. If a worker pushes on the opppr0g+ +(cqu odi zzk36b+rq*kosite end with 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 .(m u6,w tgkshdistance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is ttsw ( g6m,hk.uo 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 massless seesaw. The bhb,ia 0k ,/l6q okmam:)ubu :wlt6y7goy has a mass of 75 kg and the girl's mass is 50 kg. If bauy/ul, l:ob0kg )6hmak7:t i ,mq6wthe 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 uni8 24 t8tgphpk;b bkqb1form seesaw 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 1t hgq8 t8kb2bk4pbp ;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 supportsl w1g)weg8q)f08hmm m two children weighing 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 e1mw 8ggfl)q hw)m08mfrom 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 supporsl-i1q r82v9+ z zbakxted by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what 1zxl a-2r+8s vqbkz9iis 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 weightg4 wm owm-jvs/kv )c.7k:i1wa 100 N is supported by 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 tension is:kkvwi)w. c7wao jgm 1m/-v4n 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. 2 z7r*rz o+t7ckbio zp*k0e er+ 5 y4r,0qlbek The scaffold is 12 m long. A 300-N box sits 4.0 m from the +qer ip 07rkoz*eb4c ek7r+ ,0k*yz25ro ltbzleft 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 2y). rnlujn9pby a wire at each end. The scaffold is 18 m long. A 650l)2j n9n py.ru-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 ae)y mjmdkdq; 7v*2.sl knife edge at the 50-cm mark and has masses o ;jdysd*l.7evm2mk) q f 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 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)ts +hi 6/jbop. sxe0p 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 that at the left end, ho6pbe .ix)+ sts/ho0jp w 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,p 1jic- q(nyy m, and a plank of mass 4.00 kg is placed between them. Each scale is observed to read y ncip -yjq1,(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 connectedwmb(.g(z, ci gsrx +:z by a wire. A bird of mass 0.50 kg lands on the wire.i:c,ggrzs(mx bw (z+ 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 byzn:-iix*m(d h0fd zjp 8lq+n9g,(nhas a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in thdin8h:,nz l*(n0jg y(bqx+zpfd9 - mi e 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 cczu1e,y rx6qcd(u 0 /qw-m,o 6hg8cfm. Its center of gravity is equicdoeuc qcx g6q u,68mc0h-wy,f/z1r(distant 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 in diametb, gn)5qtgt:ser. The top is 4.5 m off center. How much farther can it lean bbq ):tgtgsn5 ,efore 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 steelq 6w k qk7y6zvuk1:a;ic gfe,1 block by 0.0025 cm. How much force would be needed to compress the block by 0.0121 kgavyu6e7 wc:z,k;ifqk16q5 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 cr yoz o06p9p:d 8o)p a5eq3xmkeoss-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 )piiu7/ xx9ra ke01im service station is 4.0 m long and 0.20 m in diameter. Young's modulus for steel )ri /09m1x7u pkxiiae 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 stretchesfkc n7x3 p17crw cv7-z by 0.20% when a 6.28-N force is applied. What is thev73 rxkznc1fwcp c77- 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 suspended from a steel wire of diameter 1.0 mm and lengtw()t 9i()tp0q*nhaxx r ay/ozh 11.2 m. How much will the wire stretch? The Young's modulus for steel is twhyt p)xo *in z q()/9a(rax0$20 \times 10^{10} \; N/m^2$.

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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 his wei8dp3j:- 7th/ tm-;m qtgvi,d je;fykight on the two crutch tips, each of which is circular with a diameter of 4.0 cm.;tme- y-7dmf jg 8dk;ptih,qjt/ :i3v 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 areacw 1p 6 oo3(4iv.ondt/uxotu: x3oq(d 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 8i2m 6rza gl+ns(ap+ga 10.0-kg mass. What is the stress in the wire? (The Young's modulur+2l(mi+8gg anzasp6 s 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 qsmiz+:+.sfv8wyo zrv;7x u8 mm in diameter supports a 10.0-kg mass. What is the elongation o88zv . +sqw rm7fsvyi+ zox:u;f 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 olx+.bh(9i0 jdo -pu)6g .ya;udffsdxrc 4h f)f 30 cm. What is the resulting relative displacement? (The shear mod. 6i;ubyf(gd.h0f)pacs9duxf4ojh +d) lrx-ulus 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 aqthg 19xx5dp u/t3a5 etmospheres (to at e95pgud/xathq x531bout $10^7 \; N/m^2$). 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 sumxp3 9yi66s 3csc ys(teel isy36 xy9s3ipssc uc6m( $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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