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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 rotational equi8 aef;d9nr*0ctph c2j librium?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What condition or conu 1- yk sxmf7+:-ccezcditions are necessary 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 rest above your head the net fo 7+giatkdwo *( rv.8mf*jwc7ydx3in.3gyr) lrce on the book (y.odxr3*g +.iva83 mnw gcwdkt7 f7j)l iy 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 outefbdx os-v uj*+61eii3 r space with a constant velocity of 9.8 m/s. What net forceo usedxfji -vi*b631 + 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 one foot on each of two bathroom sc8/a hxnp7h5d aales. Which statement is /78padhh a5nx 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. Ifhx( :fw.beclu p 7*f+ ofn1i1q they both move forward so that they are one-half their original distance from the pivot o.eq:xhpwfl71+fn * bi1(uc f 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 u*p.*da: jwc*biq /uasmall 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 th)vbm( 2m0sb**2;pgv xvw lqyabletop 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*- +r1 l.bxet3q rsudx 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is then placed dbrtlru qx s+1*3-xe.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 thcso av8)k69:1 kfn zgeree legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two sg:c 89nk1)6 afevoz ksupports 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 wirer)sv, vv0foy 0fo i7i7s made of aluminum, brass, copper, and steel. Which wire will stf0riv)io s 7fy7,o v0vretch 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 tc(.yrl)yl w--:qujs c .6 aljche wire diameter were half as great, we would expect the wire to break when subjected to a minimuy-c ).ju qllj6(-c csa.lywr:m 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 k)n2hnc1gy , dpointed arch ,2yck1h ndn)g is

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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 fr xnp uej.)ghqazfdt9:v3 k(zwr)70 z; om the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is thx.zd7zw )vzahqnuk)pgf9j r;3te(0: e 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 t3 h 2mh;yn+-lrql,cip2sd z6o he weight to be lifted is 1.0 m. If a 30rh,-+i6d3 lmo2 q2lhpnyzs c ;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. The boy has a mass of 75 kg:zic lsm,29ce(8uvg u and the girl's mc2u ( vi8,me lcgz9u:sass 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 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 uniform seesaw which pivots in c41jb-ic/2ah z lkdq/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 se/djaq ckl2- h4/ b1iczesaw 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 cca+yl+iyr9n,tm3+r e0nwn + hhildren 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+a9+mny,l0+cr 3 wih+ netnr y 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 *z/wv551tnw(o1 gtw e,)yflnhorxp8ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in the left lw51x o,)v1y t/wpwf* r8hg5tzn(enorope?

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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 by two ropes at the ends. ;8z - y;kujpph If a 400-N person sits at 2.0yzj;; pk-hp8u 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 spms m5 (i1(xyat each end. The scaffold is 12 m long. A 300-N box sits 4.0 m frmmspsxy(5 i(1 om 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 up by a wire at6 0i6prczd a7o z97gh1rh6yapy+y,vn each end. The scaffold is 18 m long. A 65 izr+ 6o1z ynyrpg77 h,6phv09ca6 dya0-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 9* p ml+flae(wthe 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectl(f*m e9lawp+ively. 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 o s wpr mb5/yx4-:tsi-vmemy*,f weight 100 N and length 8.0 m. The bots ix bm-e*y: wm4/v-r5,smypard is supported 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 2vahkka1+ef; r9jur 19.00 m, and a plank of mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person now lies on the plankj9 uv;1rra a+ke9f 1kh, 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 an l6kqy93 h6 zu27p lj,emyo8izd connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing t k6ll79iq3yzph6 ,o2yemju8zhe 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 fromb7(qoz p0 m rre1qi7./ma9aat the elbow-joint pivot, how much force must the extensor muscle in the upper ar rm7 9qa ir10q /otzbp(m7ea.am 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 bi3i8/mago a7x ase width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which it can be inclined without8axai 37go/im 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. Their.j t +oop40x top is 4.5 m oo 0irtp4oj +x.ff center. 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 0.0025 xjz5vy) 0juh-cm. How much force would be needed to compress the block by 0.0hvz)0 -jy5 xju125 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 has6t7fr 8sjr/n z4k cpy7 a cross-sectional 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 di7:vqtdswe5y h: e )mvu9fq1e*ameter. Young's modulus for 1qfmved)h : *euy7 9:5qvwtsesteel 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 stretc8kk dz4e( jm4h5qhn1r hes by 0.20% when a 6.28-N force is applied. What is the elasticrknh5 mej4kd h4 1z8(q 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 fro f5tce.a j)rs,6aw6 ubm a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire st5ajref c6 .asw6u)tb ,retch? 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-c vuo 0yb)0 emfja9zink,jc :es/j:-g, xc7j walking on crutches supports all his weight on the two crutch tips, each of which is circular witfoe-a- /kuzybc: jc sg: j mvj)x7n, ,e90c0jih 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 areab1m *8 sh i*d/6lfezyw)v vt/sxnm+9t 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 suppor,s lbx9(kgxa h/alt 7i3m48)vkq prx(ts a 10.0-kg mass. What is the stress in the as7lh g,km8 x4x bv ia)(q/(39ltx krpwire? (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 a 10.0-kg mass.t/7 7twbi 1h3 o3oiwsn What is the elongation of the wire? (The Young's modulus for an aluminum is o 3wt7/ts7ho 31iinwb$7.0 \times 10^{10} \; N/m^2$)

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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 alumin,6v-g g aasu:pgo5*9zw jh t;vtumo /+um cube with sides of 30 cm. What is the resulting relative dis :s/9htmgt z6pv ;a*ou5ag+u-vo,gjwplacement? (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 s73xpghb/d:2yojl5dyy2welm* ho ; tyy3 9t)pressure has increased by 100 atmosphe 3 9y p7jh2gw2/hd3:y) *etl5t; dbxoosmyy lyres (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 a7 fz0h6not is9b* ey,d diameter of 30 cm. The compressive strength of steel is nhytb7oiz96ds 0ef *, $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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