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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 rotato. ge*)s3ba-wv adh5p vaabh +52rk)sional 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 necessary8.q hhrc-kce a-f(x g02o dne7 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 b3p j-y4 5geq3*sbkjxyour head the net force on the book ixs 5-jq3e3 gykpb*4j bs

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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. spqjzh7:*kr ) ,qq u2a;fzj7v9c7pz bWhat net force acts ouzvp7 ska pbc7 hzqqjz9*q7 f2):,;rjn 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. W2) + kgw;w.y;l 9er xxfpdezc9hich statement is definc)wxd w9gz+9rkeexlpf 2;. y;itely 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 etm 8 v)n5 iz/g-+fm))lkpij4anq8 kkmassless seesaw. If they both move forward so that they are one-half their original distance from the pia8 )8 k/ -n )mkqknl)g5ijvzf m+i4ptevot 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 end yf,lk2v1x 1oc jg4 g2eis 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)qcv493yj c1 9uhb* dr w4qbey 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 b wsg rt+xjw8dfiq8x 8.81j8( a3gzcxwricks, 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 thaqx w3.zg g dcxj8tw1+8fsxwj8ir8(a8t 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 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 thre qbpoexwk(5 am7648tve legs placed equal distances apart on the edge. What minimum maswbv4 k8(tqx5 m6 7peaos, 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, a lmmv b;l0g,w3 k3kt.qhjy9l;nd steel. Which wire will stretchq m,;0 klgw 3tmkj;lyvlh9b3. 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 tensionp(ze )z7bz*fk of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected toz(* pz)kbe zf7 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 thy w1iwy l s.,i72:vj;pzrs b6qe buttressing force at the base of a pointed arch i7 r. ywlz:b;qwspyis2,v6 ij1 s

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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 weight to be lioy(xpd 8t8t a5mn3yd 1dh(o9 ifted is 1.0 m. If a worker pu5mpad o9xd otyd1(8ihn y38(t shes on 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 from the fulca zzi s a.5z*hum4a98mrum to the weight to be lifted is 1.0 m. If a 3000 N rockzz 4im8auza*m. as9h5 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 masvz h*l8 lu0pa3qnb 5;rsless seesaw. 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 must the girl sit on the other sirhb5 l qa83pz*vnu 0l;de?

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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 seesaw3) qspd(4 bezf 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 sit forse zf3bd4pq() 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 c0 e17/jkjeenh hildren 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, what is the position of the 350-N cehj1ee/j7kn 0hild?

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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 at the ends.s jlv4s45e.2wjib5cq4 v x2,w 3hsu sz If a 400-N person sits at 2.0 m from the left end of the beam, what is the vjb5s sqxw2 .z4uhi cvjw,44s 5le 3s2tension 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 twoh(6(aeskm -+f r 8rxxdyybe 36 ropes at the ends. If a 400-N person sits at 2.0 m from the leba xy(63(s6re8hxy rf+e-mk dft 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 at each end. The scaffold s-a;vkh cn(-wis 12 m long. A 300-N box sits 4.0 m from the left endasvc h k;(-nw-. 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 wire at each end. The scaffold is,lj- c :9hgbz0iukb 2p 18 m long. Akj:iplcz9b h,02 g-ub 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 sak*y y h* p4n4a7t/efhupported 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 thira*k*/ h ayfeth4n 4py7d 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 boao 6lfgfrs3;h b-qd6u8rd of weight 100 N and length 8.0 m. The board is supported at each ends6hd uqf38o-g6bf r l;. 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, avq36vnhamulz+-2g ui z7g ;u/nd a plank of mass 4.00 kg is placed between them. Each scale is n+ mazuivzqv7/ u6u2gl3hg-;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 w d,lc; n6uto-by 40 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 horizon n d,;-loct6wutal. 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 ar/mmekn .icp7b-: +r.ji (bhfwm 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 in the upper arm exert on them.h c:.-rbpnkm+i 7(i eb/jwf 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 lt t )9hzv9:z:onptd ud6h/g /an outer wheel 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 tipping over?d69t9h ) lzh/:tndtpuzg:/ vo

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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 7.0 m in dyyx; o:4w-6uwtxj 3tc xf*(vwiameter. The top is 4.5 m off center. How much farther can it lean before it becomes unstable?4vwtx ;( oxy-j6w:f xuwc*ty3

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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 idf xbilht g29t d1g.872(vjwmuch force would be neei tjfx1 w8gb2.92itg7d lhv(dded 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-slrau-s+i+)( zljceft 9n2a o)ectional 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 mt3x*l rydepg:25bogn/ ve m+ * long and 0.20 m in diameter. Young's modulus for steelb3le*2 x/v5+* d geo:rtmp ngy 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% whcy q;7 vpo t3eowh/3b*v;0gveen a 6.28-N force is applied. What is the; 3cbvwvpt/oe7 h v;ey *o3gq0 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 mm and length 11hv7n9zdao m 1f is9/ytkz(41k.2 m.zsy9mi a( d1nk1ov/hf t 4z97k 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;oj; *hwb rb x2l1n4a f*gmby- crutches supports all his weight on the tworbha4*f1; yb2 bo;mgjl -n wx* crutch tips, each of which is circular with a 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 anl5e 2won9vf7 bq,1lbf 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 m in length and 2.0 mm in dimzuecm , +*p)wameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modul)*ce, mpum+z wus 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*u fk8.mgxeb* rgh0yg v en18: length and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminum nebk1 h:u.gy8fmr* vgg x08e* 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 tog dkt;4fv.s z.z3aq9m one face of an aluminum cube with sides of 304zk9v;af m t3gq sd.z. cm. 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 the6+ge x,j+gvanjj3dyzh b w/7jv08g0q pressure has increased by 100 atmospherejxay7j nbveq wgg 30+z 068+/jgvdhj,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 comprx th12gz) +f5jcj pum3essive strength of steel is ju5cxzf+gm1t j)hp23 $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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