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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 kgfi6r41k iob;7oya 3-vl;zo 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 conditf3jjw:hifb*y+f *ru wwb5 qe+s0 -) k z8sby7hions 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 rest above ym8s; q /(yd 4q.e utw,xkaynh1our head the net force on the book iswy4 / mkq8n.d(;,tsa uqehyx 1

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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 9.8 m/s. :h3a: 1 i6t1hrvkblp /eci ywyg*q,p)What net force acts qy6k* echlp1wh:ip g),at r 13/v:yi bon 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 sb3lgoyk g04a3;0c 8a g(oepuzj*yu , xcales. Which statement is definit,g;3gek x84ypb 0z3lo a*u0uaogc(jyely 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 jb*7gitz a0/fthey both move forward so that they are one-half their original di*7 0zfijbag t/stance 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 smata0-zsq2b*jau2(t-pchdk/pwmj f 0: ll 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 horiz:g-u( tvk zln ,lmyg4.8 xgv:pontal 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 dimensionszz 4knjsk zce 6u*yhgh- 3r m:p:7j)0z 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 can extend beyo3j:0cs:ez)jk7z4*g hzhnr mpuk z6y -nd 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 equal distances apa,3xiotr6w a1,us *sza rt on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause ixu6s3as*a, r z1t,o wthe 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, corwh4z9) v7y mjpper, and steel. Which wire wiy79mwzr)4 j hvll 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 minimum tension of 36 N. ),x a6u8ioman h x9y5y If the wire diamh umx5noa6a89, y)xiyeter 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*btcl; q3xj(e )zs*1xx susf uedf7s4z;t-d2 of the buttressing force at the base of a pointed arch i;le)ezcfz*j(2-xbsxs;3xs dq1 ft tsd 7*4uus

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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 fulcruhva.wv :h8 qyes;x-o+ k,a*lmm to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum we eo.:mhvawaxh +,y8-vkq*sl;ight 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 wew *zsq :7n- ae-lkaod-ight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, ksaln*-o e:d z-qw -7ahow 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. a8mn pihcua 8a2a5h ))The boy 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 mupuhnc 2a8 a8)m 5aa)ihst 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 uniform seesaw which pivotsa keqiv4ow4bg7 fo)6 rj 60w0q 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 seesawoo6gfre0 qa4jwv 6bw k7)0iq4 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 chilx l)1dvzkg+x16fe fc2dren weighing 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, kxc6f2gx1v+e z 1)dflwhat 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 r m (pd8fz9;md96nvgvsgrp,/ ap wgb /+opes at the ends. If a 400-N person g nm bg(;amf9dp8prz9d,6vwvs /+ /pg sits at 2.0 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 Npwr p4,i:hwp. is supported by two ropes at the ends. If a 400-N pewh.p,: 4pr ipwrson sits 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 he qp0e3vi2h fa z)a0jxu 2ft5k8ld up by 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 tension inx t80ju5fhq3ek )2vi0aapz2f 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+4tfb qp 8/hai m long. i+ pfb /t48ahqA 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 ; 7od 4xmpsgufb,su3.by a knife edge 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 t4 ,duf3x s;7gspuob.mhird 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 a2+bfa ojmrazm)g2 l37 nd length 8.0 m. The board is supported at each end. If the support fom+ 3m agr2)ojafb7z2l rce 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 6suqn,z o,7y8 q5izldm, and a plank of mass 4.00 kg is placed between them. Ea5yozd8 ,6 iqnquz7ls,ch 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 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 cxx4:t :at0xh fonnected by a wire. A bird of mass 0.50 kg lands on the wire mixtx0x fh:4a t:dway 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 ha9zmbwp .u;r,es a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in thrwm;.b9 zupe, e 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. Itswxt-h; fa9i.2 rork ke:ln;l* center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. Whrfh :-l;n.t2ie r x;9owalk k*at 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.ve j64 cvxwvy :+9kzh Pisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. Howk:jcwvh 4ve.9+zv yx6 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 compress3vvr*ws: xhnx,mmp ;7 es a steel block by 0.0025 cm. How much force would be needvm :*hv,r s7;pwm x3xned 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 z+ybw9 ,zp t,s/zek:iarea 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 statif0i32z2 xfx sxy)sw 9bon is 4.0 m long and 0.20 m in diameter. Young's modulus0xy9 fs3zxx)wfib2 s2 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 0.20 mm stretches by 0.20% when a 6.-wq/v5xh+ irv28-N force is applied. What isv-iv h+r x/wq5 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 suspendek1drtmwg7m cy,a) k 6o/c2l8 akxo5 1wd from a steel wire of diameter 1.0 mm and length 11.2 m. Howdw7l w/1a,cr1gax6k2mko m y5 co)8tk 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 all his weight on the 8 6rh *k*oshmptwo crutch tips, each of which is circular with a di6r okh8*hp ms*ameter 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 are ld4wxql42.;lkc in lu5tk2l 7tc**uvbz6vi 9 a 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 length and 2.0 p, la, f,ea7:vzit8p dgr9)u /okn,mh mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum itpn8ar,d/, zo7 9:em,vlpfi ghk, )aus $7.0 \times 10^{10} \; N/m^2$)

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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 injv7et lm0/808x3brti r il 0rydqp;2 o length and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus f3q li t0i 0xr rj0l2;pt8dm eov8y/7bror 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 5 1.oakmo5kdt cube with sides of 30 cm. What is a.dk 5o1 5kmtothe 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 pre: /gowec; 2hnqssure has increased by 100 atmospheres (to a2o:h;qe /w cgnbout $10^7 \; N/m^2$). 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 is0ik3,eoe,gnp ehlw5g+z /*1o 9zhb rp io9l5g gkzh pe 1e,*bo,w0h+/z pren3$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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