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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 condi3:p9hlde: *mkimn2rstions 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 necessa9v,lov1kfx7r - wicsv kb c/7;ry 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 aboveiy4l csl 7kf++ your head the net force on the book iylsf+l c7k4+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 space with a constant velocity of 9.8 m/s. What 6kbv.qa.jf0m net force acts on6.mb q .0avkfj 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 a0cn/nh5c/ bosu+s) b:jsp v3u1so:fN stands with one foot on each of two bathroom scales. Which statement is definitely truesobnpscu0s o :f1 +5)/nh3c j:sb vu/a?

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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 they both mot3 s t55 vuia6g px:pf.(gntt5ve forward so that they are one-half their original distance from the pivot point, what(5.tu6 t gsvanp55tfpxt:i 3g 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 ik/h8blfwd6 ;r5aj.ru(i90q2 oib vmmts small 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 tabletoprtx6* bkz:+jl 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 bri8(jml18d ner.r vpu7k cks, 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 distanc7jkv(8 lenr8udr1 pm. e 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 *(neuh z;-zp*cp nn/ tsupported by three legs placed equal distances apart on the edge. What minimum; hne/z *n*t-cppzn (u 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 mwe+e)9kpg sdo )z f3k5xgp ta:hpwug,a e2+43ade of aluminum, brass, copper, and steel. Which wire will stretch the ga3e4,9fe)2:w+kt)s p powkg3dx+a u e5hgzp 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 whd)x(px h a,f/mnz2 pi,en subjected to minimum tension of 36 N. If thezx )dixhnp,pm fa/(2, wire diameter 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 of the buttressing force at the base of a pointx89m)+qz mot7e2x uad ed arch isz7axq)89eoxu+m dmt2

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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 b0s+u;f:j s- maipt(kfrom the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes onu+;b s- sjm:0kafipt( the opposite end with 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 long. The distance from6jwa6-y 1 b r6t(t)fm ss4lvyu the fulcrum to the weight to be lifted is 1.0 m.-al(u6m frt6 bsv64sy1y t)wj 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 masslesz 7n1z.) ted0beejmvs tk(j c a6h(*(ls seesaw. The boy has a mass of 75 kg and the girl's ma*.ze(m7 tsdt((h6jjne bc)e vz10al k ss 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 a2in/.m2ccswqy jg*ppjq j/ie9s )55 pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg.5 5 qjsq)/ yj/92pic.s 2mi eagnw*cjp 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 weighina 7 4ocivw1gp*teav0g4q7x4 zrq(df5 g 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 the41qgafzag7w0t 5*(pc qov47 vei4drx 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 qi:6) ti4epzt 9b5ufkat the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in the left9eq6u: ktpbi)zt54if 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 bydnc 8 ur.nd68n(hdsu) 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 tension in t6n)dr n8h.und(u8c dshe 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 efc:86smzh6r ltjl50eq1de5;waj st; nd. The scaffold is 12 m long. A 300mj;rfa;l6wq8s 6s e5ce 5hdzl:t1t j 0-N box sits 4.0 m from the left end. What 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 8jpt 7op0e+xe wire at each end. The scaffold is 18 m long. A 650-N box siotje7+ pe 8xp0ts
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 mark )cy (sejvmni 5qswf( g75ai4-and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. Where (at 7(qiswya(fij5s e5) gv 4n-m cwhat 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 oj,w: sl:pbo06n y,hisf weight 100 N and length 8.0 m. The board is supwssl bi:npo y6jh ,0,:ported 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 placed betw age ujd xwc(cnfg9*f4cgt.u5m+6c- -een them. Each scale is observed to read 2.00 kg. A person now lies onc x5f9 *g6mccuwg-jangd4 f(t+-euc. 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 connected by a wire. A bird ofe-m c5ixrla78+1srl j mass 0.50 kg aem l1srrlxi8j+75 c-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 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 2b8v; r,xh-fkr hj 0fa,.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to ha,;f- rrx hv0,8bfj khold 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 wcb,my)s f cyov1fp:55 trwb+4 mbc3*dheel base width of 2.00 m. Its center 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 be inclined without tipyb3bop*+c f cm4 1),cd v:y5ws5 rmfbtping 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 tan-i -h.0ysmxu0k9 e ykll and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean 90yy-mk.eus hi-xk0 nbefore 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 bljjjb(35 3jayhne.9 og-ktw * pock by 0.0025 cm. How much force would be needed to compress thjpynt5 e3(9j3hkwj. *g -aobj e 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 and7 jcde 80u/wz*w uw+dp has 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 and 0.20 m i83uf(n1 x+l2 et *gipvh-6bsxs8lx nmn diameter. Young's modulus x8ushi*b(6t+ l-x3nxvme8l p sn1g2f 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 stretche8q0wlhs a zd*:s.*h4. hpbouus by 0.20% when a 6.28-N force is applied. What is the elastic modulus ofu.h *ws4*u.hop:slazdb0 8 qh 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 k:; aeifg1 /hwand length 11.2k hw:ig/1e;af m. How 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 alllwmr .y85n f swkr;k0m4tf/-pyh; mn0 his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exertes- lfpw;h0 mmrw; /rkfynk04tmn.58yd 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 tko(p 2cxur )n05nk4ylq:(qr 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 / 0rxj* /h:g1tsm q,l l6uc0/jy qdi(gpp rg.y2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aldht0gmlu .0g/qc/r :j* xil jgy,qs(p/ r1y 6puminum 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 9m,lcq dij,d u)3h4u qd,od*sdiameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an alumld i,qds *m94 udu3jo,cqh)d,inum 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 smxn nycod()(ms8z , 3cube with sides of 30 cm. What is the resulting relative disn,sxs 3c8 ()ydmomnz(placement? (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 has increased bym u.vdp:a4lm, 100 atmospherev m.4pma l,ud:s (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. The compressive s matq od)yfu;md (t,qt .aq-v*4gb;w-trength of steel isuav,b m4ad*t q-;gf t;-qy) tw m.oqd( $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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