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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://autodiscover.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://autodiscover.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 necessary for rbm6u cxy:u3m4otational 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 equilibriumrx0dy ir6k8f-4hw k3h?

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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 f: pv4nx-dv .bp1v0)j2qrmfyforce on the book is)p p vy2vbn1frj4-qv.f :0xmd

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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 withj ue ,8:r *jznl/h1jbbv5nf *w a constant velocity of 9.8 m/s. What net force acts on iflw hnn5 zvj*1jbe,/jb* :u8rt?

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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 h,/ /(ewflgann: dlu;ohvk:7 with one foot on each of two bathroom scales. Which statement is definitely truhuk/ /(,ovw::h;nlnea7g d lfe?

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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 boaj08oqwo2e: 77d gmgo th move forward so that they are one-half thwod jmo:aq82 7g goe70eir 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 its small end nbg1v4ms, kqtk 1j+2ris 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 iy)jj-e klt2kaar6l grb 7/h5/ n

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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 dimensionspc:g t j-dv v)(u22hll 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 dist 2j) htg: (v-2ldclvpuance 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 distances apar61 n-jmini3e sn,9al mt on the edge. What minimum mass, placed in the middle between two supports on the table's ed6js ,nmlm1ie9 in- 3nage, 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 ()leo 31whe2sf azeb.;d37 soa)gx gj of aluminum, brass, copper, and steel. Which 3 lg;))d3 e jf7o.zha sbae1e2 xg(swowire 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 minimum tension of 36 N. If kcvspq(hlx fiph(+ 98t94ri+ thek ts+hipri9(8lpc(q 94 xfhv+ wire diameter 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 h. m2u -r.iajdjn-y0ybuttressing force at the base of a pointed arch i-. u2j -d.rniy ahyj0ms

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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 weightdmvbsr4(d;0y to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weightv40mdb(d ;rsy 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. ,yyo7 aru fm;z sj4( n1:rtb2a The distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lyyof;r7ut(4,zm ar:1jan s2 bifted, 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 aszk pxn3k 45*a massless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from then4z5k3paks * x 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 ecngx0vpl8 *1xq 9rzu 5nds of a uniform seesaw which pivots in the center. Child A has mass 60 x0lx*vuc 9qgpr8zn 15kg 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?

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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 senio1kjdk8/1(j k4 wgupports 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 the o141gjkk 8 n/jwkie(dcenter, 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 ropen 8u slb,/l6.ext(3t+fcdoy ks at the ends. If a 400-N person sits at 2.0 m from the left end of the bea 3lncf.8 e+syul,tot/xb6k ( dm, 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 iro0u ) oqv9ra7w1in9is 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 7qa9ri o)uinwo v09r1tension 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 wirguowkn( i8z/9a; *oah 7.ceom e at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is t weoka; o*(nm/ hzg o.9iu7a8che 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 scaffold is 18 .vfk5hnfi+0k *8vv4/ zz*i hooi:yeym long. A 650vvzykh.i fkeh*:vi iy04/5 *o 8fnzo+ -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 the 50-cm mark and hadl/y;3wcg bz y 3s+)ozs masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80zg 3)ysbo+ cwz;d3/yl-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 onnu ,k.wp ;00qenzdqr( a uniform board of weight 100 N and length 8.0 m. The board is supported at each end. If the support force at the right end is t0;prnne udw.,z( kqq0hree 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 2.0sfld3(gf1p tcd8 :kty 2(q u hd8kx-*t3fd1uc0 m, and a plank of mass 4.00 kg is placed between them. (dklp3hsufcqg 3y:fd1xttt8c -1d(fd*k2u8 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 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 ar5 ldqe4p+ -get(xq1m -ijs fb+e separated by 40 m 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 horizontal. Assuming the wire has negligible masipe+q-bmq(1fd 54g l+txe -jss, 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 wue9*5d6j-u yqddt4 lof 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor mu9 tjduu yw-dl*6q4d5escle in the upper arm exert on the 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 outer wheel base width of 2. srqlxh7 jv+y frl/1fro(18-3tbao qk8v +o-i00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is therq8fkv+--(isl7rh fobq rayx1t o v+ j18 /l3o 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 dq9 q1qbf 8s/e55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much f 91d/qse qqf8barther 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 g qcvtp/ /kui,ic:l zku ,p77;0.0025 cm. How much force would be needed to compress the bu l kippc/ ,,z 7qgt7:/;uicvklock 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-sect w*rxlrg,w 3 5/oiu*tmional 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 servi4 wkg xki(:oe:ce station is 4.0 m long and 0.20 m in diameter. Younw(4:k:k ioexg g'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% whe0fbu xoq7p4e z)t3w k+n a 6.28-N force is applied. Wowe 7pt+0 q4)xf kzub3hat 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 mm5jial4,gqhqsh(chrhoh) ;0+ dpfi84 and length 11.2 m. How much will the wire stretch? The Young's moqohp0 (h hq4)5g;f+rljch sha, dii 48dulus 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.h(no tlwttm;84o52 4a*)bla owp yce weight on the two crutch tips, mtwc o5 p4a hn a2(.b8elw*ottyl);o4each 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 arf3mwjy0p4 ez 4ea 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 diqti 0z3x cc/6vameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for a 0/qcvt6x3 cizluminum 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 diamet uauuc1 b2uf*0s*j:z7 d,cddf er supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulu 0budd f,ujzc* c17 d2u:*uafss 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 44fg jr)c w yh( 8ab8qfbj5gr7aluminum cube with sides of 30 cm. What is the resulting relative displacement? (4gcjhar4 78wf5j ryqgf)b b8(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 ly6sq f 8hvhz-qe)3f0by 100 atmospheres (to a-8h3qvffqe6 lyh z)s0bout $10^7 \; N/m^2$). 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 strength of steel za pw8paye99w)- bx5 gis89 a9ay w- e)5gzxpbpw $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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