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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 conditions are necessary for rotational eq/ lwyk36py p3*raf6kjug;+ t fuilibrium?

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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 x fc tn,c(v)7rnecessary for 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 res0o6/r f qg+-srn frk)st above your head the net force on the book ionf+r kqs- r6f)0 /rgss

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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. Whojz ru( 7yy35pat net force acts on it? 5oj37r zyyp(u

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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 hr g. pdqu91*dt-*tir on each of two bathroom scales. Which dr.drg *h-9tu1i *qtpstatement 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 mog x,3v( wy*mzafbe lf-5p, je,ve forward so that they are one-half their original distance from the pivot powbml,,v-a jfe*p ,3f5zge yx( int, 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 9kl- o 6r*casx74 yqmusmall 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 tabletop 84bf nh.:jop kis 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 a 0s.d qrfxy+z-e* c1cx 10.0 cm x 6.0 cm. One is stacked on the other, and the combination isrd1c szcyfq*ea+ .0- x 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 by dqkjv8+y6to5 three legs placed equal distances apart on the edge. What mini8o+yt qk5vjd 6mum 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 of aluminum, brass, coppr,v++p rjm 41ra-ja-ws wosc/k (f*bier, and steel. Which wire will stretcaw4j( jf c r-rpi+s+w1-s/rvb,kmoa* h 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 subjectedbe a( 8dqk:l;uc gh/g/ to minimum tension of 36 N. If the wire diameter were half as great, we wobe c8ghld(ku:/ g;/aq uld 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 point ro7r:x2r*ze6io x5iqed arch i:*izoxi6o r2 re7xqr 5s

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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 pj ea2pj2;0wf9rocbifby., . . The distance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, bief.2.9wjf py j2 0cp ,;rboawhat 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 distance from the fulcrum to the weight to be hrmt.2;2xem vr05d/4 mq hjiyh0i/ru lifted is 1.0 m. Ie 0uhy5j;x/i.t m4/q 2rr dmmivr2hh0f a 3000 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. The boy has a mass of 7(gcp4 fa6bq5 qw+qav ,+ 2s -ho,rjxce5 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 th g fj+bx-c,hq rc6a4eav 2,q( osw5+qpe 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 seesawhbg .g:md7ii. 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 sebgmii g7 .:hd.esaw 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 children weighing 500 pu wi ;;6ray1ae54omaN 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, w;y ;apaa1e5 r6owi4 muhat 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 wt+qbx)l1apmec9wyt mn/-6x (d,p ; rat the ends. If a 400-N person sits at 2.0 m from the left exp()ttwpnaqbm-61 elmr ; c ,wdy9/x +nd 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 weightbkk+lde4e -7qv wes;c.9mx 0q(ikl w( 100 N is supported by two ropes at the ends. If a 40e4x k9lv7 el+0wdm.( qie ks cb;(-wkq0-N person 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,)gxw;j)vvhs each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. wxjv;,g)svh ) 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 b12a l86okvjmd.ha/up 3zh30km hgqp1 y a wire at each end. The scaffold is 18 m long. d/1j8 apm hq0k3lmvuk 6gpz23oha.1h A 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 knife edge at the 50-cm markx/metf0 ve8xdq*p90 x)m :x rh 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 a third mass of 0.30 kg be hung x9 pf )hxm*eq 0vxexmd:t/ r80to 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,e ()p on6qs6o.ms/hw* e lgas 8.0 m. The board is sup gnw6., le6aesh )*q(ops/so mported at each end. If the 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 kg is placed bhs- arl:-2:h ,etepx fetween 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 scash t pl: h2:x-r-feea,le 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 3l+bv:sdsr +cconnected by a wire. A bird of mass 0.50 kg lands on the wire midway +drssv3b c l+: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 andzq5hn7 ;g w5f*ppl;nd its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on thwhpdn7p5;* z ; l5gqfne 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 2.00 m. Its center of gravity ) pzq-. kjg:jrahg/q7is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which it can be inclined without tippin)/parhj -:7k gqqz. jgg 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 isr(cgj 91 gvvq- 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it grc9-( jg1vvq 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 much force would fk j5/wnze)viu1 8 x(+y0 tnygbe neenk)i5nfv +gutz 1y8w0xjy(/eded 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-s5 a(ikum fs.lr uai;+6ectional 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 in diameter grzuem35x-w:a 0x76saa ax1 z. Young's modulus for steel is e5wx6sx a71 aazu 3xzrm0g :-a$20 \times 10^{10} \; N/m^2$. 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 0.20dd0m4a,dh 01kt srr0qlk2 v,s % when a 6.28-N force is applied. What is the elastic modulus of thd0dhd020 , s4rstqmk vl 1akr,e 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 o) n(p-sj*sj-xf. vb yqf diameter 1.0 mm and length 11.2 m. How much wiljvbs.fn*p s j-qx()- yl the wire stretch? 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 person walking on crutches support9*kybym th1eh * e08jhn:hk 6ls all his weight on the two crutch tips, each of which is circular with a diamet9nm :hy160*t8bl heyhej* hkker 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 g)zp.dqe9-zatf0 8f tarea 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 lengg+ 5.ia-axqgw9 khdc (th and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's moduluihd( gawk+q-c a9x.g 5s 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 lv)n: /0kk87wco ojl hrength and 2.0 mm in diameter supports a 10.0-kg mass. What is the ehk)/rw j8k0vol7n o:clongation 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 anf7l-xf)a 0jsv aluminum cube with sides of 30 cm. What is the resultin)-sfax7fl jv 0g 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 pres): 3yanq-nuyfn yzk + qiz0w4gc g)6p5sure has increased by 100 atmospheres (t 4ycz 6ynqy:nk)pq 0ig f-+n 3g5azuw)o 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 cooks(q 4wl+ gqxn1yn2grv4v, .*q,se u mpressive strength of steel is vq*wng,(qy12ne xklo4, ssv4 ur+g q.$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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