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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 equion)ya; 048l emou 6kgzs:n zy3librium?

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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 static equ*jb/0 jmuu/y;pc ./r w1nsoybnb0ag1ilibrium?

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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 forcepl2ka(s3g/eh3z iv qzs q+e 33 on the book +ha33silz3e2qg3p kze/(qvsis

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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 spacpf twc,jq 36j8t ;kms:e with a constant velocity of 9.8 m/s. What net force actkfc6wqj s8j,: p3t t;ms 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 with one foot on each of twog,j +p29v (dkc b uee4pr/c,6pdmya(o bathroom scales. Which s/cy2,o( dk6 bed9(j,pe 4cmparu+p vgtatement 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 on a massless seesaw. If they both mod11jj18:4n gixg ieg* wamcm8zs1k;h ve forward so that they are one-half thci 88j1km g:1jswnegdgz4x*i; h1 m a1eir 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 its22nx(7 pr ;ofkimss:u small 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 horizontal t:5,pvuj fzg8 9(j8yi odjpdo 2+2dgibabletop 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,m;.-dlvt7qulem.u 0l7 h9b hj 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 ebl vtqu7u0 -j hmh.leldm79; .xtend 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 is28 vgvu(vmz :n supported by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on thz8( 2v gvnm:vue 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 ide ai/dh8+b k5bentical wires made of aluminum, brass, copper, and steel. Which wire wil8 ib5h+ a/dekbl 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 when subjected to m)gq/x -aknx3 jinimum tension of 36 N. If the wire diameter were half as great, we would expect th)-qgxan3k/ jxe 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 pomyq) xg3-om1n7bf8yz inted arch isqxo3 )n1yy 78mfm gz-b

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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 weig(dm)rvfij 2wl*1/y jlht to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can 2rl y*ijd( mj/f)wv1l 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. Thefu 5xod.c -ghg-sm ny;eq.. 2u distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N qy ;.n.5oguhd.meg-u x-s2fcrock 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 massless3pu2,h/ ipmdvi)md- o*,glzh seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits ugh,m-l,mzd d iiph o2vp*/3)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 uniform sedyw 3*m)o:nsrwj 6a9pesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 mwsp3nra6*my) wd9: oj 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 twlal 5eg6 t jwu:i7z1t)o 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 the centertazel7)gw 6 l ut5:1ji, 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 supported by two ropes at ta.iwea;dfck3ot1 p0g j 5 vc3.he ends. If a 400-N person sits at 2.0 m p e1 33iv ko5gafc0;wd.at jc.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 is supported by jzlrzes 39am/1 k5-ivtwo ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, wrzk9 z-me v1/ia5 3sljhat 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 a wia(t f)b6- c 1.tbzk2fdbxp7z a3 ww,fy52fexire at each end. The scaffold is 12 m long. A 300-N box sits f2dza f-fy) zxw6bbp2aet x5 ibw3 t c(k7f.,14.0 m from the left 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 by a wire atny6 hmp 1 h:/6*h:xjnnq :vizq each end. The scaffold is 18 m long. A 65:z h*/6j:nv yxqp:6imq nhnh10-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 a knife edge at t7(d,ffh 5bhmm,1*sn.f frfcl ay* s0dhe 50-cm mark and has masses of 0.40 kg an frmfafhn7,.d,c yf(0 bl1*hs 5*dfms d 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 length 87 ipg . txh(xmp4*wh9x.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, hopt xx*x. 4w7hhg9m p(iw 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 pla2txgn.w)nr sk fsy sb-7; 2r(qnk 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 scary ;qwt-r7 kn(s2n. 2bxs f)gsle 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 separatd 5 uye9yl mhn2 mt;oc :0xdjt6orm+/,ed by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between thext/t:;y5d m0 + c ,omohmun6edr2ly 9j 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 CG is7 c-oi1pry,hj(m q.y s 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on thqm7j1ph-yyo.c ris (, e 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 out:)lb:* frc8ouubus p+er wheel base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways a *ocbf +rusbl:)p8:uu ngle 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 mijw . h7p+ zm65j p6wzlvf6b- fbvbl(. in diameter. The top is 4.5 m off center. How much farther can it lean before fzvb6jppiw lw-b 7(.h. z v+lj66f bm5it 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: hv2g0t ep)+eea idhf)pr tf 0-1rn;r steel block by 0.0025 cm. How much force would be needed to compress the block by20p h)ap1+rtreri-)d; ff 0 gev:tenh 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 i,qxvnq-(nx rl0 8 noamj+ d-mac2z2)and 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 service station is 4.0hoh-afu:a6;8hu6t w i m long and 0.20 m in diameter. Youau;:fa i8h-66o h uthwng'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% when a 6.28-N force is appliedl)seqc,snatt 52 68petc4;a i. Whc eta c);sn48 ttpia ls2,qe56at 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 steel wire of diameter 1.0 mm and 4u8hdbz7 )a1s) bs ymwlength 11.2 m. How much will the wire stretch? yaw8s4u) )bsd 7mzhb1 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 pe x:ok )si-8pdz1j6hr+bt- s0nk urc1w rson walking on crutches supports all his weight on the two crutch tips) 6snk-wudt 1bjzps: hcr8 -r0xo k1+i, 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 aresd4z9i9; rig ea 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 ler fcv4r-0 hs u9)ox9j2kvheo 0ngth and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus fo4e)v2u9j oxs-9ch0k rrovh 0f r 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 diak.u-ko3givo 06 xppe+meter supports a 10.0-kg mass. What is the elongation of the wik3x0o6vpo u +g- ei.pkre? (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 aic8z *;w)+fboej2l q6n/ ioou 7kpe a-luminum cube with sides of 30 cm. What is the resultina*+iwkzb/) o;6eof-nu7pecl 2 o8 iqj g 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; ac* yiy;smiyb 2yqq )td.8+a by 100 atmospheres (mqi).8yaaqiy t;ycb sy;2d* +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 c ttyc5og87ypn .bf*9m ompressive strength of steel is7yct ptbynm95 *8 g.of $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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