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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 condixj,lk6y.z z f5v-pc431cn6dcu a m/ml tions are necessary 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 necessar/ih 8rl 8*jq6.b/bomla f jibmo.rh.5 y 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 force oatr7if)qyy5- j9 c,gbn the book is,)yf57ga t9bqcir j-y

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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 b)nktdyw*f p,::vwi(a xe / u:a constant velocity of 9.8 m/s. What net force acts on it?w* kb t(/ ni x)apfy:ew:vu:d,

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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 foot on each of two bathroom scalerz- ri px;lh,q,+7qx/fab9aas. Which statement is ;x,a q9/+la hr aixp-fq,7zbrdefinitely 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 bala,bj0q/kijhtq 295mow nced on a massless seesaw. If they both move forward so that they are one-half their ori0tb 9/jjq, kmq25 whoiginal 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 end is intqhij5)q2ynw)fx. 1jh ey8ljg c9p(3

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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 tabqbdwjuegtkh:y- h;a r.0 s3).w:*b dnletop 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 2- 54 . vmq7toasoopsr+duc o-pbr5 4j*0.0 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 t.4c-sb 5-7pop*ts54 u rjro ovaqdom+he 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 appkoo(uz:llyr l0n 0 l -n-)8ogart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, -znrg k pyllu0o l0:o 8o)(-lnwill 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 ide(, 9xmj+tprus7y.ryhd0zu , vntical wires made of aluminum, brass, copper, and steel. Which wire will stretch u,+yjh ud(,9tsvr .y0p7zrm x 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 when su/yub :o wb39eymz6)hm bjected to minimum tension of 36 N. If the wire diameh ymub3yew: )om9b/6zter were 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 component of the buttressing force at th6c hnfo zp-pzo9-x-i9e base of a pointed arch i p hi-c-9n-fz6xo9 pzos

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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 3c96nu p 9aqwhdistance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 Nnu93 haqw6 9pc, 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 tokt kvui kuvk9t8i, )2; the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how muc8,t2 vkiv;tuukkk9) i h 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 oq 8cda;ry9 de.f 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one sida;ydeqrc.8 d 9e 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 which pivots in the centeta.u ,wwe 33kur. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg. How far from ae3,ku . 3twwuthe 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 5cex46nz.oq2zvo t w:supports 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 from ovz4.en c6z :t2x ow5qthe 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 weig9z 3irbwrg +xff *zh+vq *cow)k1au2/ ht 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, whazh3 a9v) 2xgfqbo fzkc1r wi/ w+u**+rt 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 ofhrh w oiyg,mz9-/2;oxssv 55o weight 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 in the right ropeshsz5oy; /omh2wo 95,xirvg- ?

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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 lokjjjif t.xur)tsm6aw2 9ui 7/n+ 3c* ing. A 300-N box sits 4.0 m from the left end. What is the tension in e w 97jjujmu) tfii+tca3 *isr/6n.2xkach 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 at each end. The scaffold is 18 m long n5ci*hlx4abh6 pis,1. A 650- *hax,ibnpsh465cil1 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 iyxy wx; 1a5)2gbz( prhs 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 kg bezwy r;x)2b5 a1hy x(pg 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 ynl ty2g n-d 8um)3p)xboard of weight 100 N and length 8.0 m. The board is supported at each end.y)gn 3y-m)tdp 2xul n8 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 8r:cqmdj a8, ev05 xgoof 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 3qj,g da 8o:0r8mc5xve 0.0 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 connected8m n2iu 7vx7hh by a wire. A bird of mass 0.50 kg lands on the wire midway between thh invm778u 2xhe 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 ofn/n3d3x, g lh /oh/cdohrrz:1 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put (Fz1 :h/,gnr3hdx /d3h/nrc looig. 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 center of gro39zxb.vpgz 3avity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which it can be incz 3x9zvpg3.bolined 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 ofz8h*9 s 52sx3ijdnzkx Pisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How muchsiz38xdk* zh nj59x 2s 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 be7y 2errczl 97rqj 1;sbdsan :*zdn* b4 needed to compress the block by 0.01c 9yz*naljrb b2s77 ;q 1e :rd4r*nzds25 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-sectional ar.dcu) )c(,kbaiy v 5anea 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 aq,0 m; in(u s y)mgu(ce5u-lya service station is 4.0 m long and 0.20 m in diameter. Young' -n 0mey(u l);5sma uu(iy,gqcs 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% when a 6.28-N forpglgq kq3); 1wce is applied. What is the elastic modulus of thlq k13g;qwp) ge 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 wvqx 5rn0h zxkbm(; wok 2z.4-m;oqe3gire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulushkw0 z ox5n;x.v-q2 z43e m o;bk(qrmg 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 crutches supports all his weig,7,jch.skk2sga/rhcc b5le cimr)0/ ht on the e a bcihrkc7ck0ssg,j., //5)c 2lmrhtwo crutch tips, each of which 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 -;348n9x zs: ms6e6edwqxk fy a:psjg area 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 2.0dot ,,j4qa++p if ug5l mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young'sf otlg,+5qiaj4 +up,d 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-kh2 (c-eh/ww8d9 y)pm6f oqqhkv7n5i xg mass. What is the elongation of the w m8oe)wvn- d qhq5/9fch7py x(6hw2ikire? (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 f,e*ohuwltk 5n h -//5yw0lp fdace of an aluminum cube with sides of 30 cm.5ndwpf/kh* e0lot5 w ylhu/,- 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 pressg :p-zy2 dhb/bszy z*1ure has increased by 100 atmospheres (to abou1zbhb:dzpg/y * zys2 -t $10^7 \; N/m^2$). 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 strengts:q8 .s3 *vn5 8jhntrbvswqu9h of steel isq 3nstv9s.*bus5n 8wvh qrj:8 $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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