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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 rotationalt 2q qqsfi*2e9 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 co y9p*5ti+smp qnditions 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 force ,b:13nr)n imsi vkl1 eon the book is vnm :31inlr,s1e)bik

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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 velocityq3 f6ijkjl g w+5kdtd-x kv*:2 of 9.8 m/s. What net fodwqi ld5 -fk k3k62gtjvx*j:+rce 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 sc:dtt-3aot pqcv;3f jm fpj s.:*bl:r 8ales. Which statement is dj*f j :c ;.mvqdb-t 33::fsttpp8rl aoefinitely 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 seesk9kbhprkp , n4 .wr35naw. If they both move forward so that they are one-half their original distance from the pivot point, 5 n3pr.b4w kr,kpn9khwhat 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 idwc *q7buodfd d9 x*/n+:4fmas 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 )3v+a.kdom amk.d gbj3cx +0l 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 6.0;s ew z3k3l+5t/ nkuhl cm. One is stacked on the other, and the combination is then u+l s5ezlwt/k;k3nh 3placed 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 su1)par2b+wsy u pported 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 table to overtur)ry 2bu pw1as+n?

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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, coppyp3v0ct)5b bh n2c05v j g.rpher, and steel. Which wire will st5pj3p.b5ty nc h)gcv0 2 hv0brretch 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 o ;1ln i s7smck*l9,me36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tensioskl;s,i o m7c19m*ne ln 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 buttresse-.oxry/ p5m: mshg ,ging force at the base of a pointed arch is5gg/hysp o :mm-.erx ,

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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;s h l(en:jfq4 from 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 the maximum hslnf j(;:qe 4weight 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 longtfp,ban0**y h. The distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must nbyp* ,t *fh0abe 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 ofa;.solb dqx.xw- 3 cs/ 75 kg and the girl's mass is 50 kg. I3b sow/cqaxxs d.-l .;f 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 unifq5sjnyv 0 rr7s n6m:x,orm 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 f6n 7 yv5nqrs,s0rm x:jor 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 supports two children weighing6s o-* do)xyj5jj.rfv 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 center, what is the-d vs yoxjf).j5j6o r* 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 ropesb.2yjgl )ry8)cr) a1az .zy uw at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension iryl .)2z ya )rcb a.g)1u8yjwzn 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 100o 7.d7-rv)zx.n uieil N is supported by two ropes at the ends. If a 400-N person o7)ix7ieu .dz .- rvlnsits 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 each dy-7lxb253vy/+*rt 8 zvykvl o7qcz oend. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in each wire?zvd oq/8 kyl*ox 75y7cry+ztvl 23 -bv

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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 sktz )b6+q*cd bcaffold is 18 m long. A 65q+ kz) bcb6t*d0-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 .9-;iqeqb .uqk xtn1nat 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 a third mass of 0.30 kg be hung to k-q k nine.tqb19 x;u.qeep 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 8.v t, t(;wloy;xdd;.a ft(3r zc0 m. The board is supported at each end. If the support fo;.( 3xlct,dfz w(;r ayovt d;trce 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+ d*og:a,tpb8xa)d3e v jhy*y placed between 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 frb83 gvy ajo*,ty p:+ad)h *edxom 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 byutj bfg6;3jvx9 ;k as: 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wij f9axtuk j;gvs3; 6:bre 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 nm* ) :zzrkat*cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lowr*kt mna:*z)z er 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 gravity30vbnnk+ .3w zf 1zgwe is equidistant nezzbf301+ .kn vgww3from the sides, and positioned 1.20 m above 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 diameter. The topbda)j a84pokxk ;l g7lr-74le is 4.5 m off center. How much fjl;gk-r akolex44 d) bapl787arther 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 cm. How much force wj rfermb (57 /jt/2xdsould be needed to b mrj/j75trfde x(/2scompress 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 j7y*m5 a+btkge:f hr *(fp8vla 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 se.6x0xt myqda;e tdz9- r6)xru rvice station is 4.0 m long and 0.20 m in diameter. Young's mmq d teu;tayr 066).x9dxx- rzodulus 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% when a 6.28-N 9-m:r,kdig1/llb abmm4 zvxa c/ * ofl2;vx2 pforce is applied. What is the elastic modulus of4af9p ma ;bcximm *z,-xvr b2l:lv /kgo2dl/ 1 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 s,mpls,t.7l g(:hbrxvf *k av)teel wire of diameter 1.0 mm and length 11.2 m. H7va:) sfkm(, h bv*x,tpr.gll ow much will 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 ob h+4w/mz7s fun crutches supports all his weight on the two crutch tips, each of which4+smfu 7zhb/ w 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 abzj k0zc- ;)gen area 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 supports a 10.0/d9i w9kx4)jv / yqc3 mouvjr)-kg mass. What vrm/ j qj)o9u/dk4vy) 9xc3iwis the stress 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 c9l,14anm oxauy1p 0eand 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulpoan y0 exmlc4,1 1ua9us 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 alum;pwcu.j4 s0a l 2ykx3,k/kobbinum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for alumi wlbsbkpco,0u3 k4 /a;.k2 yxjnum 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 10krv2*psj;xns/ , 7 lvw30 m in the sea the pressure has increased by 100 atmospheres (to aboutr jlv2vs/; s,k*n7wpx $10^7 \; N/m^2$). 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 3hr2foi5fz 938 b*ysr0zmel z *0 cm. The compressive strength of steel is 3 r9f5* b2zimezrz0 ly8osh*f$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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