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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 rotatid77tet-/waii;cq8ckkzh z;soc7 86t a ey *.bonal 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 necessary for static q *kce +qy(1 csj+ he,4kbmt9hequilibrium?

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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 yoc6)jn4e oj,b8bbwkj 62vv gm4 ur head the net force on the book inj,4cobb kje28b ) 4vm6wgvj6 s

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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 kl bjjn;)h*sbv /-p k3m/s. What net force acts k)*b blns3vk p;-jhj/ 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 witho c -h k,p3fz:4dtfe)j one foot on each of two bathroom scales. Which statemez :,ptochj)k-ff43d ent 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 lightnqoy:xqphfx m*k wtoe6 yp-1- 4 j5n80 girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot -n5 q: 0x4 oefk6 8mt1op*wyxjypnh- qpoint, 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 itze5mk+eg,jb1y o(b8q s 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 tablkdw r;jz,io0e; 0nv jq0 2/f9 db.ngedetop 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 omd8c4i)i(vab2v8 x kg+o o1oef 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 t(gc ev i2obox)vd14 ako+ mi88he 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 legs placed equal distancy8liztn2mf b47 sh 6)yh( 1tgves apart on the edge. What minimum mass, placed in the middle between two supports on the tablev( )7y bst glzt281hihf y4mn6'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, and sf)5*tiy7 tquy kqn-g 0teel. Which 5-fiqq0ny7kg*)t yut wire will 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 mi kji ud8;u5*ld-lhhq 56/nd9qha j8 ee+zuw4a nimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break i6nq/ 8he5+zad*;u5k4ueda8h9 ljhj qu l -dwwhen 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 fox( ll,ew en*:d7ck*cj rce at the base of a pointed arch ij,lwc*e:e x7dkn*l (c s

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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 fro pjw3;cfkc;uac4 6w,im the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite e3jfku;ca;cw4p,i w6c nd 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 fkc pjgs4o; zuk5vi a7.b88t+ distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on thevajk tkcz; +7 b.8gi5f up4s8o 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 7k0d 5 2 dfgo*;dk7nsu8toymj/tu a8b85 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one 0ukuds27 y8agok;/ttn*db58omjf 8d 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 ufm8jov2jtj+n9lkpf n.9 9x.uniform 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 far from the centemu9.fxo+vjl . nn8 2fkjtpj9 9r 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 childr3i9 gj z7t yw+2bkzc-oen 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 position c 3gz- kz+2wiobt9yj7 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 we ds5 7+ n-kfl +9-hlehhj-ngyqight 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 bea-en-k5 ++ dyhs9-qhlhl j7 nfgm, 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 by3mw09 / ekv,/57xap b vhbc8k,gtsk ge two ropes at the ends. If a 400-N pers bmps5e0hc9,/vkxvk/ g b8wga3ke7, ton sits 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 a wire at each end. The scaffolzvcow9l)g cw3fm2 . k4d is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in eacwgclokczv42 )m .3 9wfh 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 eachfqraoo:cmd/lp 7o;59z uxhe() as,w : end. The scaffold is 18 m long. A 650-N bo s;zaal:p9 c ,oxd o)(7m e/w5hfr:uoqx 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 tvrsn;n9ub3n zn.t3nyv 96jt /he 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. W.tr vz ;j vsy3 nbnnnnt/39u69here (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 bo tl2u w)n1w i:gmv4v5bard of weight 100 N and length 8.0 m. The board is supported at each end. If tht51l i w4vvnb uwgm:)2e 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 of mass 4.00 k( gef8y3 w2d3yvrpn, z9ud )bcg 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. Hpv ),(9f e2zn ry wgddub83y3cow 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 connected by a wire. + cn2h e:t,oyg ;ltt+p2dvrl8( a-he qA 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 wire has negligible mass, what is 2, toh(lt ldtac+ynp;+ g-:vrheq28e 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 +im v ,akfz1al) u1dn52.8 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 ml 115 dzfuva,kia) n+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. Its center ofkjflz 9k3 4 b6l(/y-w gnrrea) gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angl /(krg)kz46lnr-fl eb93jy aw e 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 diameter. The d/3jee fd0 c-yk- r/vr8bgp7htop is 4.5 m off center. How much fabe8dg/ f-jp 3r7/y rk0vhe-cdrther 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 mucha:eskb k,:t c. force would be needed to compress the block by , sa bk:.:etkc0.0125 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 a cross-sectional area of) ( dz:oetnj; y+vae4c 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 and 0.20 m in diameter;xch /k*b7:anu6ydy(075 i3i btvamymj d5d p. Young's modulus for steelky5ivai : hdy 7bx;7c*6m(jndbmt0ya5 du/p 3 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 stretxv i iej21/io bl,10++yi bnofches by 0.20% when a 6.28-N force is applied. What is the elaiyvol ixn0+1/eoj b, 21i+fbistic 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 szc 3ible4.1hue q9al *uspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulc. 4e9q3* ulie1lbzah us 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 pers 3f* 2u8u)f2sftytp*s*nm hlzon walking on crutches supports all his weight on the two crutct p*f 2z3f 2)nmt*usyuslhf*8h 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 ar;.ub ;+m/bnfeb/bk nf 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 length and 2.0 mm in diameter supports a b (4fq1uty8ph 10.0-kg mass. What is the stress in th(uqb 8h1tfp4ye wire? (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 lengt8 uxa0 yzv1li)h and 2.0 mm in diameter supports a 10.0-kg mass. What is thui xvyal8z10) e 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 an alcd ;(haqzc ;w8ch*d;gip6 0y luminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for al ;*;qagzc pcw;h 8dychi6d0 l(uminum 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 atmospheuttmunv5tt h2- buxf 13;n95n retm uu3 x -1;u9b2n5ttthf5nnvs (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 c )q n0kuanu2gcr0f :z)m. The compressive strength of steel is k) fg)02urzn0:acnu q$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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