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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 rotati,b*, tvzea3 *xsuih .ional 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 a ts/bd f1pqtsd sb-j9 7/f;i+ore 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 fn. pybm.:smhx+g swh/;-0nl uab i2h/orce on the book uwsb.ybnh+gml0/:ih2p- .n ma /xsh ;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 outer spmli 13orw xa7,ace with a constant velocity of 9.8 m/s. What net force acts on itm l3w,a7 ri1xo?

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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 eum1 oxci/7a6r ach of two bathroom scales. Which stax 7 o1uir/6cmatement 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 baljq0x9zk a,4zlanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot poinz4 za k0xqlj,9t, 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 sm6 d, eqman:gs)pw8b*ymw )hh;all 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 horizopc1 j;73s8roam h/ml rntal 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 ofs12s 6:nojdvhl 5 *i+ azscdw+ dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the +na+j 2dzo1h5s:sw6 s*lcdvicombination 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 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 placed equamnamq j/9 w:l) nlh,3( fpi)wll distances apart on the edge. What minimum mass, placed in the middle between two suppor nq(nl9m)jp/hi3m fa:l,w) l wts 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 al+4ueg b7.xk2bx4p dwfuminum, brass, copper, and steel. Wh7eb w uxkx4 +pd4b2.fgich 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 found to break when subjected to minimui7rv pv/;- sqvm tension of 36 N. If the wire diameter were half as great,;v7i /-rvvp sq 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 tt-2mk6rnh r o-f3wfoo q:a(y0 he buttressing force at the base of a pointed arch im3 faqh-62wk-f y( oon:or0trs

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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 from the fulcrum to the8w i wsze(/aw+x9xx2xx6n2hz weight to be lifted is 1.0 m. If a worker pushes on the opposite end e(w+ n w8zxi692x saw/xzxhx 2with 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 longy-d+l ef l+xr o68e+td9i -vbg. The distance from the fulcrum to the weight to be lifted ix6edd+ +gvb9- f o8rie +ly-lts 1.0 m. If 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 75 kg b 3mc7,nizmnz/3r. 7njn* nlqand the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one side of the sc7zl3*nnjinn/,r m 7 n.bzq3 meesaw, 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 r,c1ij8 0a (b acjp2zeh91adtuniform seesaw which pivots in the center. Child A has mass 60 kg 20a a1 czpr ed91jjbc8t(,ah iand 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 40 N supports two children weiau2aqsauv7y(, g c:w)qe 5t)cghing 500 N and 350 N, respectively. If the support is at the center of the board, gctvy a q:)5ea()cqusa2uw7 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 100 N is supported by two kpid*)w3- * szrhqm gct2ceznar;3,pj7t)h,ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the te2rhg mq) wp* kz)rz-;n,*j,d 7itcac hptes 33nsion 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;in/dl hz16 5a e4/+dkxlt+ idd ul7dslzvg11 is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the ia6 z 1dln+/h ;1t i/uddkl7edgv+lzd4x15 slbeam, 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 end. Tho3tq,o0h 0 3e 5nejwbbe scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. Whe5h 0,3n ebq otojw0b3at 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 at each end. The scaffold 8 b38mhsx d7dtpb*ia* is 18 m long. A 650-N box spdibxsad 7*hb8*8mt 3its
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 ytcmhsd nv1 /*(y c8y;at 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 8;cyst( *mn ydhvc1y/ 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 N and length 8.0 m. 9goh)x5bvq(btv 70t zThe board is supported at each end. If the support force at the right end is three times that at the left end, how far frzb7qhxtgb9ov(v 0 t5)om 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 mha d/s6-m zu4s690mpvpo *fb i, 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 plank, after whicz-6 sfmv6iu9bhoas p 4*d/p 0mh 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 bs+d.blojr.(p7. zn je y 40 m and connected by a wire. A bird of mass 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 negdr(j.zj7 s lo+e pbn..ligible 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 p;op/ g g2pgl4d0.gcpcm from the elbow-joint pivot, how much force.cdop 4 gp/gp0gp;g l2 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 outer wheel base width of 2.00 m. Its c4q(z .j; ayho*e.mj ryenter 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 . zjamr 4yj*e(.ho ;yqbe 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. Thes k774x ).p2xll0xw+ghtkj 39rt hrla top is 4.5 x0l k7jr2l9+)ls.xg t rh4xht3wp a7km off 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 cm. How much forh b.( i4 jrfn6xd/hle/) by9goce would be n jxfyer)i/9 l 6 h4/.obngdhb(eeded 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 hagho t8ni *zrq3j )eok.2)5ezls 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 an5 yye+y xuq tvpo+:ifoq )2q(6d 0.20 m in diameter. Young's modulus for steel is iufot)qy2q+( e xqyp v65o:y+$20 \times 10^{10} \; N/m^2$. 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 0szml hypu4vo12; l )id ;f99vt.20 mm stretches by 0.20% when a 6.28-N force is applied. What is the elzy 1 ;)i2v lh9p umofl;9ts4vdastic 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 andl lx5qs:i,+k 8bzuw6q length 11.2 m. How much will the wire stretch? The Youngu6lksl ,zqb+8q5 wx:i '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 perso0np5 x92i qwnfn walking on crutches supports all his weight on the two cru0 95xp2fnnwiqtch tips, 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 0sb,3)* e i8bmqtxvwpof $1.250 \; m^{2}$. 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-kg m ej1dby w;hum06k)v hmh q6)i1sm(7jxass. What01w;m 7 bqhj) h6j6 veu s1hm(yikxdm) is 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 lengo8 t8dii,ak qq+z ad-kxje,ds(2v :*opm7k y)th and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongadk- p+ va k8ai t)q:j( 2 dy*skdxq7z8,m,iooetion 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 anu)3poa*6zu + y bqzm-e aluminum cube with sides of 30 cm. What is the resulting relative dispqm3 ze +p uuoy6*z-a)blacement? (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 pressure hgv;* -t7w6bkzh8qz uy as increased by 100 atmospheres (to 86kw uq*-z zygvh7b;tabout $10^7 \; N/m^2$). 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 o g lawi;dpg-a+ge.g4k ej a)+*f 30 cm. The compressive strength of steel is pgwg. +g ;) aalkeeid-ga4j*+ $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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