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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 rotae4p*gh dv4)3lol8fdm- mmk 8z tional 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 equ74iu(0 osyo dlc )x/ssilibrium?

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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. Wvcbc 9dzt2o +:hen held at rest above your head the net force on the book isc29 :vcd o+tbz

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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 velocit+ndy+ jw(f0acsd v;i. y of 9.8 m/s. What net +n;0aw.(f sdc+dyijvforce 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 fmj oj1q(yio mvu 9d j;ar(d/22oot on each of two bathroom scales. Which statement is definitely tomj a2 (jou2yi/q(r;d1v mj 9drue?

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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 bal5mi+yzg2r5un anced on a massless seesaw. If they both move forward so that they are one-5y 5ng mr2+iuzhalf 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 small enn invi2c,:mi;d 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 horizont;,fdn b* ykt;v;x;s ezal 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 dimensions 20.0 cm x 10dmh jpe10u:i2.0 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 dihp mi02udje 1:stance 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 susz :f5f x4r7- .tf)cpxp4gu vfpported by three legs placed equal distances apart on the edge. What miniuf x7 4s p r5txcfzv4-ffg:.p)mum 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 of aluminum, brass, copper, and steel. r 0i ptv/t 1grd,a8( /6 fejbqds,owi/ Which wire will 1dbfrq d,it8(pj/wr goeva//st 06 i ,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 minig/oc o(k (9fy; vwkd1-2 yvqjdmum tension of 36 N. If the wire diameter were half as great, we would expect the wird v vq(k1kj2/ cwgo9-yo ;df(ye 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 th;f3n+c,rnmz z6wc 6tck3*jq v e base of a pointed arch i6nc qc, zvrcf6*3zn t3;kw+mjs

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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**0iy1og2izhmx wah1 :js( bx the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, wh:1 *iizahhm0 obg*j(2xwyx1 sat 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(n-j xnw4p lve5e:gx4 fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how mucl:v4nex4- xwn gp(ej 5h 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 bava t3,wva9ro -lanced on a massless seesaw. The boy has a mass of 75 kg and the r3v vtw-,oa9 agirl'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 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 oy1kl(s e)fxot-4jowjvf 7)8xh 3.pt opposite ends of a uniform seesaw which pivots in the center. wp .to 3ex sk7fv-4fjoljto1y)) hx( 8 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 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 weighingjib - 6ltey i+/:i3gy2bh gp.z 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 position-p 3gi.ei+t y y:jbib26/gz hl 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 umcksp.hnmcb;, 6 .a8100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the ;u6bhpnac.. 8m,m cks 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 sup 1of;sm5w;-6rvwx rivported by two ropes at the ends. If a 400-N person si 5-;r mrisvxw1o;wv f6ts 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 va ) uc s:14n:g n3,*ujb0tszbkhxfi/at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tensiu13ia) :bu*,sxnchgbnt/j: z 0f4s vkon 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 long. zs7j enjqgp7vsga(bw 2/)y2 (tr2o+mA mr7pvas/b2ogsnj tqy2(z7 ew)( j2+g 650-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 ,4 ysnsok9t)2 * +yfpktv m4unat 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 marknt+n )2 m9 4k4fuysstvop,y*k) 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 8.0 mhj vfw gkn0n4o 3w-5 s,7s*ouy. The board 5u3 gkywn 47* 0 w,sho-nosvjfis supported at each end. If the support 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 )o78 ifolr9ojplaced between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after whicho8o)frolj 79 i 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 q0p t7scp59fj9 quf)a40 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 negligible mass, what is the tension in the wire90cautpfj7qs95f )q p?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Assuming the lower armvypp54-ppaq/ymet803o0.x pm uz 0 hz has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle p50zaep p/xy.4v poh y z-3mmu0tq0p8in 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 bclnjtge*n(v*z.x x/6tv smi k, 3y8)s ase width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 ts 6 gs ex( *vnmj )z*8tiv/3cynk,x.lm 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 e5hjbp)grwi q - 4iu8l:g+ anoy6.f9jtall and about 7.0 m in diameter. The top is 4.5 wfhral+eo)4 8ingu69jy. q5gp-ij:b m 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. ,orjii)5 rzop )e -)a0nxmi9 tHow much force would be needed to compress the block by 0.0125 ))znmieix r jp )90tr o,-oia5cm?

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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 hasw.hyq7 wv)g j(ts b6*nt.+j cw 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 9d d9 e uj)* lko6eiwlmsa8w;mb s)(e(in a service station is 4.0 m long and 0.20 m in diameter. Young's modulj dele 9wl(( * udw)e6ob8mksa9sim;)us 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.k5pr dko+j*-z20 mm stretches by 0.20% when a 6.28-N force is applied. Whatp kk5j-dzro *+ 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 mm7wsh zh7-nj zswck.6+zf:hpur:0l(3 c nu4sa and length 11.2 m. Hsk:ls3z7-7 p4.a n 6us0:u ncrzf h+zjwc hwh(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 on crutches supports a wek.6k,;vf7of1 yir yll his weight on the two crutch tips, each of which is circular with krk;o7f16e if,. ywyva 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 of yn2 ydt72 -r6n ssvb5n$1.250 \; m^{2}$. 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 dia) b4 xhxc i54 pte*agsti2.hu6meter supports a 10.0-kg mass. What is the stress in the wire? (The Youn6*2xh ec h bp54ixs.gtu4iat )g'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 ak b)gjj.9p 5vv4ujphr wh7c0/ 10.0-kg mass. What is the elongation of the wire? (The Young's modulus 9c4w7hpjjjhbkv5)0g.p ur/ v 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 alumi6gy2)dkwlik02l3 6 a)ogkn rvi ez5j ,m9an2knum cube with sides of 30 cm. )m6kaka9lk2j,zol n)5g6n w0gyde32k 2v ir i What is the resulting relative displacement? (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 pressulsr x)ft4u53;alf, q rw8at -xre has increased by 100 atmospheres (tx,-u4)5rft8rsqwfat 3 xa ll;o 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. The compressive strength of steel isjv woxl) , pg )7:pb+vea,t)ms lse,j m w,vb) +p7axog):t)vp $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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