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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 forbo3zg9tpr6zsbp n3 lablh;i1 1 (t-o( 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 conditionnpz (adk,3 nu.x.imq*s 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 your head the net force vqyk4v i er6mqywk)7 x:91jb)(j1 zjjon the book i9j ke46y1m1 vbxj qizq:7(yjrjwk)) vs

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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 ouv3 gm) o-oz1owb 4hls1ter space with a constant velocity of 9.8 m/s. What net mh- bz4o)g3o1oswv1l 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-3 c+lso m (tdzwbpwpm33g5.e each of two bathroom scales. Which statement is definitely tzg.c3+s 53lo( -et 3wm dwbmpprue?

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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 vvjqsg)/y4 z/ both move forward so that they are one-half their original distance from the pivot pojvvg s4q)z//y int, 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 endvy zrn6ai0(vb+5 (z ut 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 tabletop jsq wzn8c..wfo6* i l(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 10.0whv z ))b z*hd0 ce7ewsw-9vy-bn:li) cm x 6.0 cm. One is stacked on the other, and the combination is then placed so that theyhle)y9e-wh7v0 bb-)* ivwc:sw zd z)n 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 three legs placed m 5dmm4)39ymy prcw 6hequal distances apart on the edg4 hcwy5 963m)mmd mprye. What minimum 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 a56kb 0i5 e,xjklhcd( 4e6isv iluminum, brass, copper, and steel. Which jl ikkec,(si5 db6x 6i4vh05e wire will 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. *or xsn1+3epq /ne)hl If the wire diameter were half as *1enh3pox+qr nsl/)e 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 pointed arch y w1vwgk kom9 )m il87z)9:nctgc(3nd gdk 9 w:k)9govcz(n l icwtym1n)873mis

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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 br-se6 ac8cuxq njd(-g6 1e2oa e lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can be6 gju xd-earc -e8(6 sa1n2qoc 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 wen-gvspxt*- i -ight to be lifted is 1.0 mpx - v-s*gtn-i. 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 massless seesaw. The bopt 1 34j/f1ukkmb;ez;t6 ,fytk7 is kyy has a mass of 75 kg and the girl's mass is 50 kg. If the boy simti4kff36;b;t yksy kpuj k71, / zet1ts 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 pivor4u/z nbc i/c5ts 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 s4 /czbrc/ni u5eesaw 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 sup3t 5w n08hfggpports two children 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 fropw5t3ng8 h 0gfm the center, what 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 2iyzsqfl8a0.th- y79th9hh a two ropes at the ends. If a 400- s2f-thyh7.qhih tyla 0az899N person 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 weax.7ry,lcktcd+r t *;ight 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m ct;r , d+kty*x7clr.afrom 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 issn zxl o pjfmvvrcb 8ncm62t-)x31r/ 1*2i5b h held up by a wire at each end. The scaffold is 12 m long. A 30mb8n*)2cls-itvmf n rho513 xbj12crz pv/6x 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 b 7itb5uq 9r-nfy a wire at each end. The scaffold is 18 m long. A 650-N bf-tnu9qr5 i 7box 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 at sh/y +uu7pco6vv-q wg8o4euuq5h46 j 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 third mass of 0.30 kg be hung to keep the stipvov6 yo7u5c euws h +u8u-/4qhqg46jck 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-+t dnc :r.i,)wz l ; .o:otsbdfwt4vx of weight 100 N and length 8.0 m. The board is supported at each end. If the support force at the right end is three times thar.v nsw lw:c.ootbd)t- d4+xf;:z,itt 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 o1 nf(nrro u9uv d90t(wf mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person0v9 tonu urf1(rdw9 n( 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 separat h z hg;- cvhcfynhip+h./e43(ed by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, v+gh/ h- hchp4efn h;3iy(c.z 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 j2/vxaz.o : jv5 zh (gdn9el:yof 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 the lower arm to hoav.ej95g o jl/: (xn :vh2zdzyld 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.am 9;6::tyglf(1puh3 pvdgoci s s0)a00 m. Its center of gravity is equidistant from the sid)g0hg6oiyl: ts:cf u9a(as;1v3p pmdes, and positioned 1.20 m 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 tall and about 7c g2j9v z+ffj..0 m in diameter. The top is 4.5 m off center. ff 9jvgjz c.+2How 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. How much force whtw q5um x u:1k2,7jxfould be needed to compress thek,ht1xwu 52u: qjfm x7 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 xda0q vub-rk 0 b4p*,j00f pxsarea 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 4.0abvk 8o vr4k*1 m long and 0.20 m in diameter. You*v bo 8rvkka41ng's modulus 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 force is applied. Wtgv. 9c9abje7xkf ; nx)6p yq+hat is the elastic modulus of the.; ey+ 9xa79gq)vkf6 btjcpnx 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 p a4cc288wme 57ffjy4kk:ipt diameter 1.0 mm and length 11.2 m. How much will the wire stretch? 4mc8kp2 p4 5kiaff 8j wtyc7e: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 ale*u4u r00h/;gs le aupl his weight on the two crutch tips, each of which is circular with a r4s uuupeagh; 0 0e*l/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 f09mqec qksq9m ( yj;v. *duigv( v)x*an 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 diameter s i vp6ew.(st2g; y*mgwupports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for alumggp;t s6vwyi*w(.e2 minum 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 inp6m ;t7sp1gyxf+7nht70rn wv; a8yqo n62hxm diameter supports a 10.0-kg mass. What is the elongation of the wire amf0 216n8gtt hn;r;v6q+pyx w ps7xh7oym n7? (The Young's modulus 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 58b n,vjh-rtj N is applied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displac-,5nr jhb8tjv ement? (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 presrz-8o):gamq h mr r)uu9ztf 35sure has increased by 100 atmospheres (to abo)frzg83uqo amt :r-u5z m9rh)ut $10^7 \; N/m^2$). 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 3yf)9mse kd0hi 7ck0;g0 cm. The compressive strength of steel is 0gcme;0kskf)i9 7h d y$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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