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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 63 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test63.html
 作者: physics    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 cond7qb (9f2k kkmoitions 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 necessary fo:dky1vb/t,:ce z p4x*qfcsxvyf46* mr 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 y;- j*ep-ju rtuour head the net force on the book u*upj-tj e -r;is

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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 velocitkh ;)j ( 9mnrm1ahi9no*u-hxqy of 9.8 m/s. What net fo i*oahj hmq (9-1)xrm kn;9unhrce 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 st20ugn uxs8w2l ands with one foot on each of two bathroom scales. Which statement is defi 2gw u82slnu0xnitely 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 seesawv6dmfpx a4 ,-y. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to ,6-vxp 4a myfdthe 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 smalend2pinbl1y /,c*-ab l 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 table/8 d3eo-k +1vlb/chy hcouud 6wk4x -stop 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 cm x 10.0 cm x 6.f m qjn7dh/8x80 cm. One is stacked on 7jmf8nd/8h x qthe 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 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 w1-n4zyk qkrp*r a12q by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause the tabk14qkaywr*nz2 rp1- qle 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 steel. b5n (l+sx a0jq0b9pnx9xjxs5b0+(b laqn0pn Which 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 t :bgjwd wze9*5o minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected t5dge :zw j9b*wo 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 w e1qu+, oxx f2cedqr3hd0 :4othe buttressing force at the base of a pointed arch i x oq 2d+wdfx3,0urq4 1che:oes

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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 th r cao5t)efzw/z -,l/9p wuk7ge fulcrum to the weight 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 be liftcw/-gpu7 r)/ t9lo5kzawfz e,ed?

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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 wei f1*l/sumq +asght to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted 1/auf ms l*+sqon 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 7 p7klo0g yi+c25 kg and 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+2gkc0 yi7lpo 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 un.iw6wi*cd3 j k 7xgm+wiform 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 * 3ijmgw 76.xkci w+dwbalance?

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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 children weighing uiuy6 uko,hfod62u) nwoj j 0;c1:09j: uviac 500 N and 350 N, respectively. If the support is at the center of the board and;0niu:u jkof6i u,c:6aoy j2wuohuvc)j d0 91 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 e*g)zl dr(u 2tN 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 iszl2dtr)( eg*u 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 s*7+w r f;e+ihhlky;zop 9 aoi7upported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the be7y;w*pkf ir i+9ao +zlho;h7eam, 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.*o,p.-d ttpc :uol/sx The scaffold is 12 m long. A 300-N x*:-up/ ot.p, soldt cbox sits 4.0 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 u4z+oo (me.dn u(j4cs v4db h5kp by a wire at each end. The scaffold is 18 m long. Abu4 djz+k(cdmhs5o.o e4v(n4 650-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 yd l)xxh zh2;: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:) hhxzx;2dyl 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 oy ah*nd4on06 yf weight 100 N and length 8.0 m. The board is supported at each end. If the support force at the royn y64d0nah* ight 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 kg is placed betweeb d)g3yuj50hgek3t*w - hbf. qn 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 thbd3h- *).0 jkuh35 tfwybgqgee 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 con hq-j/lihysr 6p+o 0m,nected by a wire. A bird of mass lh,h r 6-0qjso+m/i yp0.50 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 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 thv.o2y,ah l 0vci-y e-me 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 shoteocmi v0,ay-2- y. vlh 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 o(p3eg yu8nj6 qt+23x 8.xy,qwggwft df 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above3y wx+ug 8(pdqq,ftn28yje ggt x .w63 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 7rwa. (pzh pgzau0-vs/t/1jed*0i iw m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before itdigwa0jr-1pht.(u 70z w vze/*/sapi 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 ha,qy74dr zg/ 0.0025 cm. How much force would be nezygd,aq/ h74 reded to 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-sectionqi ,s 2 ajnhm9j*s;zk)llc44r al 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 4.0 m long and 0.20 m ivnehq7 ./fk6s 7w(zfmn diameter. Young's modulus for steel.6w (nffes/7kv7h qmz 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.ry0no0q qg5irls 9y- .p/saa)20% when a 6.28-N force is applied. What is thegqi 5n a/o0ry) qs.9-0spy lar 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;ujt u6:e;e( hl5mqo ++tg9uczyy +ij a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? Thuugt jh(u:e+e y+6jl9c;o im+tq;5 y ze 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 perso. krs)lkhm-x . ;6:ioxr+i ib.iy/bqen walking on crutches supports all his weight on the two crutch tips, ehb:6kl..y.eb- r; sxkxi +)om/irii qach 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 area ofau04so:a3q ruhsn ;+j $1.250 \; m^{2}$. 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 mmy w.ks5c/ f9gv qo x09gz,nu9: smbdt: in diameter supports a 10.0-kg mass. What is the stres:.9 g0wfvm/,5k9bs q:ty uog cxd nsz9s 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 in diameter supports )zka6xhp p0o5a 10.0-kg mass. What is t pka0z6op)h5x he 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 aluminum cube with sides o+0 gf kvs)o2vg30pz ttf 30 cm. What is the resulting relative displacement? (The shear modulus 2kfg0v) g vttzo+3s p0for 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 w6p z6xg v(hqr z-k5u,: kksv1pressure has increased by 100 atmospheres (6,p-zwz xkhgv 1u(6kq:srv5k 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 cbqh md77;g2oa diameter of 30 cm. The compressive strength of steel is; 7dbcg2 oqhm7 $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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