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习题练习:Physics Unit9: Static Equilibrium, Elasticity and Fracture



 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 rotational equilibriur cbl qt9a6/+; yd6awmm?

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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 nen ,s*9o ghq:m*hgo3j 8hos(q+cc kxx3cessary 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 forc1z mj9c n.fcnluask049d0 )aee on the book cle)j u41 09 dznfnka9 .0mscais

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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 witp qep:)rmc)( .yw6 eohh a constant velocity of 9.8 m/s. What net hqcmyepw.e 6( r:)p)o force 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 foot on each of two bathroom scales. u ltbssrk;+l/p2i*g (b w(pt6 Which statement is defis2 ;6b gu wbr/tksi (t(lpp*+lnitely 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 or,ytgvo qo0 4o htj ,l.nv,/b/n a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the gqn ot/4l /v ,,hbro,0. yjvtoseesaw?

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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 ep: x+iu (wmc1w41nav gnd 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 : lr 3z3dg*qcjhorizontal 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 bric0ziowp z t)ia, q)yg)3ks, each of dimensions 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 beyond the table edge without topplingi)pogqz)i,y0w ) t3az?

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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 plai* x (ddg ;yw)iibe(j8ced equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's e* dxbg;ey()wi8 j dii(dge, 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, :wb. u2zoz7vp -;wdhr ( mamq8copper, and steel. Which wire will s(u ahor2.vwb:7 mp zqwz;d-8 mtretch 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 teni0qfmcdkd86;6qzhr;j- s p v ,sion of 36 N. If the wire diameter v- d,i ; mhq6rz60kfs c8pdj;qwere 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 ofb6v xxveve;+7b5x 5p3luhe m4 a pointed arch ixv ;m7xvbe 5vp+l bxu6he35e4s

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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 the weigh)9amx6vpdyb- ,)z7ub)59gig hw s bg it to be lifted is 1.0 m. If a worker pushes on the opposite end with 40)6b9 zum)9wg,xhgs) igyb b7a -dvi5 p0 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 we p:t+xqk96e:ma.h.8jtzllpjpw 04 jf ight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on the :tl8z6qhpwxl4mtkp j pjeaj.0 +f9: .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 alphss,7pu.lk c.0kb9 massless seesaw. The boy has a mass of 75 kg and the girl'cusp7,h 9 0p .kb.lslks 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 opposite ends of a uniform seesaw which pivo:wlrt+ hi3 a,jts in the center. Child A has mass 60 kg and sits 2.0 m from the center. Chil+jlr:wh,ai3 td 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 weighing 500 N and 350 Nw:q yf-/+j f*; wphuxf, 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 fx-wqw+*ff/;jh : uy pthe 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 ropes acpbmuxz41;l 7n6h1mh(1k qdz .wf el *t the ends. If a 400-N person sits at 2.0 m from the left end of the bea.lw(qn*k4ldc 71m; xzmehzuh1p 6b1f m, 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 al,8p ktb ohbp2ad 4 0pkl8 e*1jg9l3yct the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tensio l *kt2dlhy8b lb1eo4 9308jpppca,kgn 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 scaffold y6e z(c85qt:gj l fuo;is 12 m long. A 300-N box sits 4.0 m from the left end. e8jouq: ltf;5g6cz( yWhat 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 is 18 m long. -8v pohl,z)u8o b isareq:s -vm58b5j A 650-N box si:i-os8z ohqb5 8 eam,pv85)jusblvr-ts
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-c,z dp 9wpz,od-m 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 o zw ,dpp9d,-ozf 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 uxfpxe5ebh6 315y gqc9niform board of weight 100 N and length 8.0 m. The boar1cxg9f3he55q6y b pxed is 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.2 rq fub6ris0 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 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 i.rf 2sur 60qblocated?

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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 conjs07)l ajn) jnv9 u*zcnected by a wire. A bird of mass 0.50 kg lands on the wire 7 c lnajs))u *jznv90jmidway 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:hi3/+m dk twzggr2f 0 has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much f:2fwk0h+ r/gm tzg3i dorce 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 mawi i f5;-k3 gva9ru15 zqsuo8v t)9qv. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maxim r)a38i 9 oit1kvs5zfqv;qag w-vu59u um 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 tall and about 7u2u (cmz)k 0wo.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it become(u2cu wkmzo 0)s 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 muchqp o7b.xjct+6cj4n:h force would be needed to compress the b:4bo cq tjj.h+c6n7 xplock 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 crosh/v6 aax ,:bwgs-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 and 0.20 m s)y o 7zh 6x u8d(koj1zq)4fnoin diameter. Young's moz j 4(zoh 1q7x)n d)foo6yu8skdulus 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 6.28-N forceo.)v qm bd55j fkpou94 is applied. What is the elastic )ob4fdk.9qmjpouv 55 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 suspendedd3smc i1d2gkn) acj shxq1:97 from a steel wire of diameter 1.0 mm and length 11.2 m. How much will12k3m ni1xh:jq7 acdd cs9g s) 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 0j3s 3hkho4fk all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is k0 f43oh 3skjhexerted 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 ane wl 6 w9, o/vz:dp)vuy-qtb7b area 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 mlaoq o:/v4w0 s in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for /v:lw0o oas4q 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 su slx66- pbnsqq::2oewbuep4 mn2d;7 ppports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminum m6bl4: pu s s6qq-exn 2opb ;7dw:p2neis $7.0 \times 10^{10} \; N/m^2$)

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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 facfz8c 8kls.5,(ima zlbm .4feme of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shel.4e8 . blmza(if5c8kz,fmsmar 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 jt vh ),tshj64the sea the pressure has increased by 100 atmospheres (thh6jt)s ,4 tvjo 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 strc-mv hy 77xm)4 qxg+lmength of steel is vm7- mqx74)l +xmycgh$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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