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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 m vv;rs 8c.g kv p0t(/xyj35rtequilibrium?

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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 equilibrium?gbxtokzq))q)s * -vz4- vor/ l

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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 on m*w2bagrom+ : the book is rowab: m+*2mg

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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 constanesnq4bjb;: xh gy :05dt velocity of 9.8 m/s. What net b yhndxb0e5q :4sg ;j:force 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 arfb8c tc5y,r(b:wvgr 0.p2 fscales. Which statbft(yr58.0rcb, apc g:fr2 wvement 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 botsb+gisg(r, ;n.imy0 ph move forward so that they are one-half their original distan0nrgm+s;p gsby ii, (.ce 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 iwbr34ru 5f v 1g) e(4tyabefn7s 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 ho ice36a/dh/s mgs-z,r rizontal tabletop 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 dimensio 88 am1d1xoa0ooej*km ns 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is then placed s kaa m 1e8jom8*1oxod0o 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 three legs 7b5b /sn.)ted eomof4placed equal distances apart on the edge. What minimum mass, placed in the ot edbf)4o5 e7s.b/nmmiddle 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, co v.r ik6,.hbx m.4v lta,,q0domr(nzqpper, and steel. Which wire will stretch the least?, xzlq6.m0qartknmhi, .b(v4v dr,.o

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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 minimumnzg3 (teir/r*,w yg2 m tension of 36 N. If the wire drz r/nwg2 yte, igm*(3iameter 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 butt5yrp/ck :xb cm;qe,z3ressing force at the base of a pointed arch i pcbky3xq/5;erzm ,: cs

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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 fr6/jg x/g), o:)*g-da ekwg ecs x-wqi7gybvp:om the fulcrum to the weight to be lifted is 1.0 m. If a worker /)w, - g-ew bs jy:gk6qx: g7gcve/*pxa)goidpushes on the opposite end with 400 N, what 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 t1ej ez (ctmn:4o be lifted is 1.0 m. If a 3000 N 14njz(tme:ec 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 hur,odc 09eh t( r5vvr;as a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from thevd0o5 v(;rte r9 ruh,c 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 p hz -+ r+ody buodb-:rd5nyg(q8:v:iends of a uniform seesaw which pivots in the center. Child A has mass 60 kddobbo-p:5:yy ur 8:+ngq+rzi-d h ( vg 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 toiw44m.q.e i 40 N supports 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 1.4eow qiti. 4m.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 N is supported by two ropes at the ends. If o;ehqalan *43a 400-N person sits at 2.0 m from the left end of tha3qnea 4;ol* he 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 weight 100 N is supported by 6h8vdito3di-x)kkr :ml3la8two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the t8il3r-68 xti ) mhvdko:3dl kaension 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 wi;/gcg6jx3j2t+eg bla re at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in each wb2 ;x lg+gej3ag jt/6cire?

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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 byr 7gpk a/bw;*l a wire at each end. The scaffold is 18 m long. A 650-N bo*wgk/p7ar ;lbx 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-sqci8 rw e2h,.mp r8q2cm mark and has masses of 0.40 kg and 0.60 kgih p 8mw8 q,esc2q2r.r 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 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 lkmx a,bz:l8/,rxx a* N and length 8.0 m. The board is supported at each end. If the support force at the right end is m/8l lkz*abrx a,,xx: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 47tf* yd5)erjvwdx) amass 4.00 kg is 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 from the r)7dajyx f)4vdw5tr e* ight 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 bnin:58 q* tbnr+y wqq+98bk aconnected by a wire. A bird of maiqk9+nn5+q:wa y8q rb *8tbnb ss 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 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 81k0mrtidh i70:r jyj its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on th 0i8mk0r7djr1:thiyj e 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 wh/dev)g7dj/y phh :y z4 :m5hmyeel base 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 angleyd dzgmmh)e4h hp/j7 y/v:5y: 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 Pt q s;o:uncay-( op8 m5yw9-csisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it won;ycs(-:c9om ayst 8p qu5-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 muc/uu4 b/ft-0wq m2kohxh force would be needed to compress the block by 0.0125 cmbu2uxm/ tw -40qfh/ok ?

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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 h uf3q-egb56xqcd6ke( 1 p;lrand has 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 izlw/ypczj2(, 7ug0 h qn diameter. Young's modulus for stg,wyc/pz 7 q(j0lzu 2heel 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% wheny8ssl ano:h :3 a 6.28-N force is applied. What isn8shao 3 ly:s: 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 mm and length d :18ieh 2:7z jyir 1iezim l/qpiz*0y11.2 m.yi e1:j0z1*rliq8z/hi ipeiz 7 2dmy : How 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 on cruakt oo5)ju.zo617yvlh rui/ 8cum+ kp /mo*1wtches supports all his weight on the two crutch k//h*zm18)o1cm.ui6p7k otl wovjr 5ayuo+utips, each 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 0quvj wh3d4( fvma32zof $1.250 \; m^{2}$. 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 s at f1 a05b(zfioejf*,upports a 10.0-kg mass. What is the stress in the wire? (Te f 0*t1zfoab 5i,(ajfhe 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 18bqho; ggx;p)f(9 hgrrx , vbm in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation g; fg vq81 9pbhxh o)x,;rg(rbof 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 o894onwsd6 o-zgik r4 8ytn5cpil)4daf 30 cm. What is the resulting relative displacement? (The shear modulus for al58 na8 r 4iip6o-d94ctkd4gsy wo )znluminum 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 th(j)bd lxqw74f e sea the pressure has increased by 100 atmospheres (to awxq7)f(4l djb bout $10^7 \; N/m^2$). 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 steevympue (;.qt /l is u pe;ty (mv/q.$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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