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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 63，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test63.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 44分  得分: _____________

答题人: 游客未登录  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 nec hwpj9;0 xy )ucqic 4khrh;b/7 eg17hxessary 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 necessary for stat,jl f ;se8.pranl8y e/ic 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 on tyi7f cpm8pex5x45zv 2 6-r bvhgyr//zhe book 7f /em p g5i5bv8y2r6p 4zxyzxv c/h-ris

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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 net 6vtl sqo2l-+t for t+ot6lvl2qs- ce 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 with-z8pi)xo n,hum :(mf*cgr y+x one foot on each of two bathroom scales. Which statement is definitely tr rhoi)z *xc,g -yp (xmnmu+8f:ue?

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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 (o8qvn ob5m zn ii.+x3massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will non.z( i i q83vo+xbm5happen 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 en9zajeif qt00 :d 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 +emv8dxkv vz1 os ddv**tj9 32in

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two identical brickswj: kqng*6oc8nc)pyu* p 2n5l, 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 tnjp)wukp*yn56l8gc2 : o* cnqable 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 d0up/-dm ocy8equal distances apart on the edge. What minyudcd po/m-08imum 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 oda+b8ks e4e3o7z wx(uf aluminum, brass, copper, and steel. Which wire will stretch the leaw4oz(se8+d7 ubkae x3 st?

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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 subjectes2mnmi3,:x0 qgx5y8 pcjyo1fd to minimum tension of 36 N. If the wire diameter were halo px 51:n2fig xq jm3s0cy8,myf 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 the base of a poiid95 ,-o r p(hiaj:fsmnted arch ijfd(hris5 a:, o9pi-m 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. T 8-see4kovvub. )ax kr+v ay3-he distance from the fulcrum to the weight to be lifted is 1.0 m. If a workavx+ 8y vk-u43e ao)ksr.-vbeer pushes 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 distngfimk4319g3 p ,dhbfhx ay5.ance from the fulcrum to the weight to be lifted is 1.0 m. If a 30hk9f mhxya 3 4fgdg3p5ni 1b,.00 N rock 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 massless seesaw.+ cuhrfxxw:*tw-o 0.3hmqfrl e5 g3i0 The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one side:r3 xlmrt-eg* xoqi0fhch.+fu 03 w5w 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 7) ywuz6hpg-tends of a 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 center must child B sit for the seesaw to balance?w 7)-6zpghtyu

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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 ttgmhc+nh+7 o/,aah2 owo children weighing 500 N and 350 N, respectively. If the support is at the center +t+/o oghhamh 7nc 2,aof the board and the 500-N child is 1.5 m from 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 supported by two ropes at the y8;d e 8dpepk)ends. If a 400-N person sits at 2.0 m from t)8e;p peddk8 yhe 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 b73s8 w51czab or ifqo0y two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beaz5fsc0 qo1 3r8bwo7 iam, 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 scaffold is 12 m lonjw 9pj ns 9-t516ediktg. A 300-N box sits 4.0 m from the left end. 6wpiket j95n9 d- stj1 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 at each end. The scaffoa4x -9 uccq ool52o nt;/h;koeld is 18 m long. A 650-N bo o2xekt5q;o/hn o;lou -9 ac4cx 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 rihn, ghp7,ii zq*+2mlm,x 5a knife edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at t7g la 5phq,ix mh i,,n2*+rizmhe 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 10073l4gxq03; g v izsrhw N and length 8.0 m. The board is supported at each end. If the support force at the right end is tw0qs7;vr3l i34gxg zh hree 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-wu (,hq/fs he plank of mass 4.00 kg is placed between them. Each scale is observed to ruh( h-sfwq,/ eead 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 wo0t 4 7aei-;kxvcpv bp574pc 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 hor0iv otxcbwpea4 kpc4-p7; 7 5vizontal. 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 is 12 cm from the elbow-x b,621idfvrijoint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 k 1r6vxi,id2fb g 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 m. jnggqu7y5d602r poco1*t.g m Its center of gravity is equidistant from the sides, and positioned 1.20 m aboy.n6*2oudg1gc jtp 7q m g5o0rve 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 diametejl. ;h,uq( p2:qh vlymr. The top is 4.5 m off cen y,qh2h;u( .m vjllq:pter. 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.p.zuqrjg 1c (xv 28s0x0025 cm. How much force would be needed trv cz.g 82jxu (ps0qx1o compress the block by 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 and has a cross-sectional area ofy -w / s)ojvu. qp 99z(*fk0/vnglsriz 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 0.2du )xkp)gyh1w a. 2 t 2iegslj5*zyg620 m in diameter. Young's modulus for stu2 kxe)dwy g* zhy2 1tp)gil5a2gsj6.eel 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 c jza:axz-,u26.28-N force is applied. What is the elastic modulus of the z2j,uxa zc-:awire?

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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 7 h;3hj p,z9bqqeky1h 1.0 mm and length 11.2 m. How much will the wire stretch? The Yhhjb7 peqq, 9ky1z3h; oung'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 onb2reox d.e;5 72 0unxmnfz-k v crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted7n z k nrumvf;5b2.x2de0xeo- 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 ar6znr1q4hti),s k nk;dea 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 0)dqi 8ec.4v:kd;ig z gz,tm qin diameter supports a 10.0-kg mass. What is the strc. izqzi0g m,8:d4k veq ;)gdtess in the 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 length and 2.0 mm x5qbjk) /:k, grmu u0ein diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminu rgju)k,b:xqm5 ek 0/um 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/:h scu uoyda*. 6-fio of an aluminum cube with sides of 30 cmo*a fisuo.u /dy:ch6- . 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 )wfh*clmt/zqe*g7 nu+xhpe5+ kv; .h atmospheres (to7fw+.e/ hzx*+m*h)u 5hk tgpnc qle;v 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. T8( e7+9umq9 gt ijbrwmhe compressive strength of steel is e79tim+rjuqg8bm9w ($250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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