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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 rot,q7jj2e poa n 0(gfup5ational 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 w) rkn;5ymb;gm hfcq)h g/l-)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 reso f7klfivks5 4irgjw9 : -)d2et above your head the net force on the book )j27l w k:e9 5srgov4i-fdfkiis

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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 9.8va p,or -ylq): m/s. What net force acts on ial:,vq) ory-pt?

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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 sctn ui2-nfns/szm62 .vales. Which statement is definsnfvzsn/2u.6nt- 2 imitely 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 arqy 5 ch8*xd/ y0f+expdu+0ft se balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot poiet 8xy/ +s y50ffd +c*pqudxh0nt, 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 k*-o+uf,sf tvk +gpr3 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 t0*gx6gbur/ hxq f/ ,dbabletop 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 dimensn -9;nnii5 v 9f wdrs2k.l9afsions 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 distance that the end of the top brick d-kffl;vw 5a9nn9is r s9.in 2can 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 supporg6*e 8 yqyn- ula+y3srted by three legs placed equal distances apart on the els*n+ eu yygy3q86 ar-dge. What minimum 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(f mux6nzg c/) of aluminum, brass, copper, and steel. Wh6 f/unx)( cgzmich wire 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 foundvp lb*qeqpp 9, ma4sf(uh(, l7 to break when subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect *aehq b9pf,q7p4pl v((,sm lu 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 butt/uaw-pkq+j) uressing force at the base of a pointed arch isquu)wpj+/k -a

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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 fih9c db4o o6pa) wjc+/rom the fulcrum to the weight to be lifted is 1.0 m. Ifjh)9 adibocw/po+ 6c4 a worker pushes 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 weif+ *mxq dkfv +hs-i7oek71 gz(sd -,vsght to be lifted is 1.0 m. If a 3000 N rock is 7s7dm ,fvx-ok(vf+hg+ kezqds -*1is 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 ma, l+fn(p bfwqbp (p/j(ow ; e.uoump4*ss of 75 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 the othp powfub(ub+(o j*., p wqlemf4 pn/(;er 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 opllv8g:v(vo t if ,w0*zposite ends of a uniform 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 for the seesavlz8l:wv (0iofvg* t ,w 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 N d8cnh7/q :)r6a j augyand 350 N, respectively. If the support is at the center of the bo n:aq8gd)jhy r7uca/6 ard and the 500-N child is 1.5 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 10novu63uvrq mv9h4upulalfs 2: ) 3-1g0 N is supported by two ropes at the ends. If a 400-N person sits at 2p m:u)lr vnsu6g -ouv9 124au3h lfqv3.0 m from the left end 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 weight 100 N is supp,i)ur;0lrgjg n3zei +,m -ig lorted by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the b) gil3;rnui,0 gl+e zm-,grjieam, 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- +tf:q5y kx,6vdg xlx a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tensil :xdtkv q6g ,-f5yx+xon 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 m lone6zu7(2 y.5r1hxw z bk8s wrxwg. A 650-N box siy7kz (rbwuw. 6re2 hw8xzs51xts
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:)evju li1u7bs l r:o+:gqqo 0 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 1 :q :bu:slqi ojur0)voe+gl7 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 cr d(3tc8h2 p()we-fheffam. a uniform board of weight 100 N and length 8.0 m. The board is supported at each end. If the supphee -w(2 dc.mfa3h8)f fctrp(ort 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 betwee/0gh- wu rri -sdsyn./n them. Each scale is observed to read 2.00 kg. A person-id /.w0us g s/rh-yrn 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 are separated by 40 m and ;7vlald-/la q connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causi -l;la7adql/vng 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 12muw g0ljp9 9t7-xm zi2 cm from the elbow-joint pivot, how mu9w90jmx p 7tlmizg-u2ch force must the extensor muscle 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 out iszklk-mxp98c:( x s)er wheel 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 angle at which it can be inclined without tipping ov)xp i kcs-:(z lk9x8mser?

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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 aboupbi p2h.6 p bb(-6usgl0zgzp/t 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it bp/0s6pg gub. bbp-lpzz6 (ih2 ecomes 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 mu8kijv6z : ll1ach force would be needed to c:ik6lla vj1z8 ompress 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-secrcx qrv;8uw1.5e4 -j2sfba dh tional 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 statio1esixh3x c u4jn /mi*+n is 4.0 m long and 0.20 m in diameter. Young's modulus for steel ije+ xu1/x4 min3ih*sc s $20 \times 10^{10} \; N/m^2$. 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 forkt6 + 1ol(fwhokm*4aqjr2n3xce is applied. Whaw 16foalk*( mrkxjh342 no+tq t 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 muwkw t+a6 bn+d836iyi m and length 11.2 m. How much will the wire stretch? Tn 3+a 6iud86bwyt+i kwhe 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 wa2jglfy) fc q:l- vpj-eq:0;cq lking on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on-j0-:q: ql ; qv2pfcc)yf eljg 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 arex1i 3z f+xsri9a 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 le 76fo5k xy; e *blvl)svbvlsh/:es )q)ngth and 2.0 mm in diameter supports a 10.0-kg mass. What e sv lqs)b;lxl/7ekhb*vf6o) s v:)y5is 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 and 2.0 mm in diameter supports a 10.0-kg masd//gp ls8 j:mb yj9*ans. What is the elongation of the wire? (The Yml* 8 9/s/ngjyjb: padoung'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 ,0yn;w* y .;r tohfiv; eiy/hsface of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus fof0o/rth.;;iv ei ;,nyhs*y wy r 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 sj)ldn zl;khh,ih:qe i: )kr47ea the pressure has increased by 100 atmospheres (tdhj)hi :,4ni):k 7 eh kr;lzqlo 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 diamete)a4k vp,dct l-r of 30 cm. The compressive strength of steel is-atdpc,)4 l vk $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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