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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 condyg0,b butah12-c /cyjitions are necessary for rotational 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 are necessary for static equilibriih-u u q5cxds-taj6 zk*x:; /num?

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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 onn eleq* ;+sb uo9;j-)-ktnc ph the book is- *u n9b en);-pl;csohkt e+jq

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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 consta:ldi2 u,3jq 5b)c hvb;jp o6wtnt velocity of 9.8 m/s. What net force actu: h j3cb;wl2jvq6dpiob,5t)s 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/*ah4lity: kq5-n tb l with one foot on each of two bathroom scales. Which5:n h-t4lk y/lbtaq i* statement 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 balanxgh5sd1g 12p .vh+ ;xystq6iyced on a massless seesaw. If they both move forward so that they are hv t2hd x gpyy516g.xs siq;+1one-half their original distance 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 smaoi5rct; 2 ,zu,v9*i gjuci(v ell 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 tbl+ 0d-l zz 2aitg-k2tabletop 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. k,)rg/ tvrci90 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 t )tgkrvr, 9c/iable. 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 *e:)-sri8lpu qd v,;km:ap fpthree legs placed equal distances apart on the edge. What minimum mass, placed in the middl, r)eu-mi8;vfsalp*p :p dk:qe 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, //d,sb(l ha; j8whujgbrass, copper, and steel. Which wire will stretch the least,g j( b8as d/ulh/;wjh?

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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 subjecte5g zv5k1t:;arqk *2f8-tfl mzorfmq9 d to minimum tension of 36 N. If the wire diameter wv2 k5f zt8t5 afmr-f*qk o 1g9mqzl:r;ere 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 buttressing force at the base of a pointed arch g v+n.jgg3-ksis.s k3jggn +-gv

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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 to-bzjy5 s : rzna0k6)che weight to be lifted is 1.0 m. If a worker pushes on the opposite end with jky s5co:bnazr) 6-0 z400 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 fuccnzwx: 86 .kflcrum to the weight to be lifted is 1.0 m. If a 308fzcxk cnw 6:.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 he:ddt45b 9 quak4(fo has a mass 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 ote:bo 9h4dk f5tqud 4a(her 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 opposittqrq .4p 0v2rs; 2 7hasnf4ciue 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 0qvf422 tir74; shc uns.rpaq 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 tr+ p2x lt0.gqweighing 500 N and 350 N, respectively. If the supp .2txqgl+rt0p ort is at the center of the board 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 weightj(ybl 84(bqf n 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.b (j4(8qyflbn0 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 supported by two ropes o2y9-ze ab(sa 4o(i bcat the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is t 4o s9 oazb(ya2(eci-bhe 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. The scak4 rs(p f:ful8ffold is 12 m long. A 300-N box sits 4.0 m from the left end. What48 (sp: lkruff 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.am5 +cc,(cdoj ((f; p/vgqtwfr6 rlp/ The scaffold is 18 m long. A 650-Nfp(ga tlp(,/jwvo fcc5 q+6r;c (mr /d 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 the 50-cm ma kp) p)5(amgvjf4p9bfrk and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respeck j)pp f5avm()4b9fgptively. 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 N and length 8.a0n - qsm /hp*9bpodi2eji*wcd + :o,q0 m. The board is supported at each end. If the support force at the right end is three times that at the left end, how far from theop*-0 p *,w/ qb jaoqn+hid2: id9mesc 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 l ;l1aoyu kw3-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 which the right scale reads 30.0 kg and the left scale reads 50.0 kg. How o- l1u3yk wla;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 sexvl6p sx29x1 rt5c7oj parated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poleslp795 cxsvoj1xxt r26, 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 cm f h3amunh9vox0h z7ay7f8 fnr 1wl20-v rom the elbow-joint pivot, how vhf8 nw 2mxuf1yvrn zao97l07 - 0h3ahmuch 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 outer wheel base width of 2.00 m. Its center of gragry:j(xg z a2p25h: k(cv+oh4abz 3zcvity is equidistant from the sides, and positioned 1.2zha b :a2zc:g5 c2pz4(xy+og vjr3h(k 0 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 is8uh*26ec 42tzcg 1urwqknfs 7 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can is tw6*fug2nhecc 48zk2 r1u q7t 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 stee)+tdsoi +b,ea l block by 0.0025 cm. How much force would be needbsoa+ti,de +)ed 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 has a cross-sectional ar5 gj0z :rs 4eojk7x;cjea 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 i7evni54sg ru 1n diameter. Young's modulus for steeln7s5revui 4g 1 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 shh9oc0mu 8 d/fb7t z)htretches by 0.20% when a 6.28-N force is applied. What is the m)8/fzhhhc ou0 d7bt 9elastic 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 lenu*wh*(za87h rpvph c )gth 11.2 m. How much will the wire szw)(phcr u ph8h *a*v7tretch? 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-kjdw( xr2-e708ofztadris 0 7pg person walking 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 the floor?7dx020 zarrje7io dfw-pts (8

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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 rx/j32:v s8lnvln5arx0 el o6area 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 lb00al ,nflczz 6 c7y r-zafadl72 m95qength and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum 0n 7 qll,azzma2rafz9bl5d0fc 7 yc-6is $7.0 \times 10^{10} \; N/m^2$)

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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 i9 5nx*jf+ds tln diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an alumif*ns9 x5jt +ldnum 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 alumyfp-qv vwmpolzs /x 9i6/p(f3 ,6je u7inum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus /ijqyxwp9fp(f-v l76 oum eszv/63,pfor 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 has increased by 100 atmosph0xqhere. pd( z1,yh-hehxed ze1yr-.q, hh0p(res (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 a diameter of 30 cm. Th so)rhdi e98v0e compressive strength of steel is i0dr )vesoh89$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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