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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 eks1jdr46t2 5k0ps 1q ckuicp 4quilibrium?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What condition or con+q z1f sj9/gbkditions 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 at bv2qlbltu5ep:+ 5g0t rest above your head the net force on the book +glupt5b0 b :v2etl5 qis

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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 winhgk948* dspsux52qjim l u84 zfp3 8tth a constant velocity of 9.8 m/s. What net force acts onl k5*fpxnti sd8j9u3z m442 sup 88gqh 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 r ejs7gvd-e . h/l8 gi6w*uvz.stands with one foot on each of two bathroom scales. Which statement is definitely td7r8 g*vgw6v.eilse-h .zuj/ rue?

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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 ligyti :+a7 .heg n)dqs pbvhxvq03v3 9a7ht girl are balanced on a massless seesaw. If they both move forward so that e)3:3sp9b y h 7+i v0.nq7hdxvq tagvathey 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 :fk1(d m 3nfdidx+*i ssmall end 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 horizont 11b)/kn nsght v)12htevsr;sal 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 dimensions 20.0 cmwxypa/9 kexn fel; 8)/ x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is then plw 9/pxknf y;xl )ea8e/aced 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 threfz/xprchdqb3 s 20-:*u-uhh,-klzh se legs placed equal distances apart on the edge. What u:c-rphb*l/z ,--f23hskh zh sq0 duxminimum 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 wirwul4 zhr75 w.ies made of aluminum, brass, copper, and steel. Which wire will 5w7r.4 whil uzstretch 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 when3+6kz.nxdgoh7lp zc : subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tension o3n .ldkx gpzz6 o+c:h7f

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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 zzpc-b7/ )p u4a)nl:kf vflv- jol8 2iforce at the base of a pointed arch is)l4vf2 j 8fl-)7izpkbaplc /zv n:o-u

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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 dievf*2(vq g)fg ycj sp4)hf* :i5rpi/nstance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pus2eiy *snqpig5f r:vf f)*hg/j4 )p v(ches on the opposite 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 distance from the fulcrum to the weight to be lifte+c) my2hj ypg0d is 1.0 m. If a 3000 N rock is to be liftec0p2yy +mj gh)d, 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 mass of 75 kg xa +45 3safwcx:sr6g)6tx1qvpz;u l vand 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 s6u +svcx tq6 apra3:sxz5g4v)1;xflw ide?

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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 1x a ln*q38h3c t;gouzuniform seesaw which pivots in the center. Child A has mass 60 k; c8 ghl3zox*n1q3u atg and sits 2.0 m from 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 childrenayi l;a:-y qwo h/.a6k,qe8oq 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 from the center, what is the posita;i ,yo lkq/-q:8q .ohae y6awion 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 ropes at the b dl+l4pbl,oh/rt if* ,ne w68ends. If a 400-N person sits at 2.0 m from the left end of the beam,+iofn pdt6/w4*l,hl,lbbre8 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 10v cmcisc ck(.*sw1vn5i(nv . :0 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end cccw sisnc( 1m.( i.vk:nv5 v*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 i(rk.ogs x2l;hs held up by a 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 tension2kh;o sx( l.gr 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 at06nyzm n56w:cg8uk ll each end. The scaffold is 18 m long. A :mw6 g0lz kyunc5n86 l650-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 stickk qxk*dh4 )u/6flfuig e,* r.1p s3uwy is supported 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 kgyhglu )3q,u 4/*f1i.e6 wr fsxudkp *k 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 wehoir3bv7m7n/zgc 9 /y/kt+ o*jnl x1oight 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, how far 3gyj/o7/mb9n xr tko*hno/ 1c+7izvlfrom 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, an2wm-1zlnh-ux j3 kx-9yfi6*gs4 fownd 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 right scale is the person's cenj-9hfkiuy2l3 6 -wn-w g*nf xxsz14m oter 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 separatetbq+3m)xv o c+ jy+(psd by 40 m and 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 horizontal. Assuming the wirc ) xpvbom3s+yt+q(j+e 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 mass3j1p4d slh(pf of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor ( 4 jfl1dpp3shmuscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put (Fig. 9-1)?


本题所包含的其它图片:

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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 2zy,o ,0frd-ur .00 m. Its center of gravity is equidistant from the sides, and urdy0,or,f -zpositioned 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 tkv pn6qywoi, )m/ m+;7.0 m in diameter. The top is 4.5 m ktpmi q6 vm n);yw,+/ooff center. 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. H1 ho s/rs nkt5;3afo/kow much force would be needed to compress the block by 0.0s; tao/ok3sf1rkn / 5h125 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 an ,y3sk2k z*68pxaik ciy0 ,ctfd has a 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 serv7wpkm*g r-)fqhq dz. 7ice station is 4.0 m long and 0.20 m in diameter. Youngzgr) 77kw-*d m.hqfq p'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 bywg s u-m n.gl4hvvo2:s5xq97z 0.20% when a 6.28-N force is applied. What wluhs9 .vo-z 57n xm2 s4qggv: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 suspended from a steel9sa l42pt njo0gw,.ey wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretj g p24 wlaens0o.9,ytch? 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 7i 6uooam6j av,/f8q1 ,stzbf crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressurem,6sfbi 6 afv7o/oq1,tzaj8 u 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 oftu5of nah 3(i* $1.250 \; m^{2}$. 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 sup t.,drfefv9 f+ports a 10.0-kg mass. What is the stress in the wire? 9ef fvft +.rd, (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 a qa uf*b*dp)loov/ 7.+ae0j;6k hnkdl nd 2.0 mm in diameter supports a 10.0-kg mass. )ul +fddpaevak .j0o6 bl* o;q nh*k7/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 one face of a,4exscf7cqou()ur.(c gy mj5 n aluminum cube with sides of 30 cm.yscxq.54cc,j(e f (ugr u)7o m What is the resulting relative displacement? (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 1030 m in the sea the pressure has increased by 100 atmh7 ,sayyfnennh ; wb+qu((6qb s7 8t6pospheres (to ab+s b,hhp; b6 t6wyqu8nenqy(7n7a f(sout $10^7 \; N/m^2$). 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 s*el-lk1igf xr t96;etteel ist ietl r;1 -69gxefkl* $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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    总分:44分 及格:26.4分 时间:不限时
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