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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 rotational equi9cqb ap/ebg/ p-m bj;5librium?

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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 necessary vr k931 yn,skms5x)lffor 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 foe1lq0j mp4y3/bvy *5r dqv+f jrce on the book jjq* 5p dvelbyq/y+3vr m 41f0is

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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 velocita2jqs9l b3h nf,wqd .:y of 9.8 m/s. What net forcb2s9d:nhq q3 ,j wlaf.e 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 stanycj.*bqs1 .mb ds with one foot on each of two bathroom scales. Which statemsybq.1.*j mbcent is definitely 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. If1q sm 1al4l5eg they both move forward so that they are one-half their original distance from the pivot point, what will happen tosam14eq l51gl 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 smaudas/x4fs1 f99bog:1,bqx sr 4 f5capll 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 tabletop is z g).9 dpfw*:yvkf(ui 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 10.0 ci*)iailm j8 e )-ns2 epnl.k7em x 6.0 cm. One is stacked on the other, and the combination is then placed so that they pr.lee2kjns 8e *-m7i nii))ap loject 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 equ*d /zz ory1a9)j,lwv 6yxckp9al distances apart on the edge. What minimum mass, placed in the middle between two supports on jk/r) caodpl 9v ,xyz9 1z*yw6the 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 i)lu, b iqrt3;d;ap9ofdentical wires made of aluminum, brass, copper, and steel. Which wire will stretc,a 9d ;brpfiu3otlq);h 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 t lbwqkbx,u/g8u y:ki 8s;v4m5 o minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to breasg:/5 b8b8uxik,yk ulq w;4vmk 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 pb13x r 8r s;m7ipi8fyi8yrir pmxs1bf7;8p3 is

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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 tc tini8y/*+t7r smq/rp.nc b6ot8 /he o the weight to be lifted is 1.0 m. If a w8b.c/r nme/ *ch i6 st7yip8tqr/on+torker pushes 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 fulcrum to the*q 4xmt gvgl.8 weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how muchg qm*lv48gx.t 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 ja-x0do/*kiekf lz8 +a massless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2ifa xdk-k +zl *80j/eo.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 opposi6f,nixci4 yki9 ju*wc 7w,gq.te ends of a uniform seesaw which pivots in the center. Child A has mass 60 kg4,6c*,cgiy. 79u wqnijwkfx i 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 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 we gp;v63 np8 xty*pvxaoun6 4f)(dt.l xight 40 N supports 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 from the center, what is the pospxf3.8p(*;y)aodxn6gl x4u pvvt tn6ition 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.b ik n v0il,sdq9x0v6 at the ends. If a 400-N person sits at 2v,q6 d i9.xlns 0kibv0.0 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 N is supported by two rop,vn u4o58rbh xes at the ends. If a 400-ur5xoh , 4bnv8N person 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 held up by a wire at each end. Thzb:hg 5 x m i0: 6*hu;mwjhu:,uc7zwaue scaffold is 12 m long. A 300-N box sits 4.0 m from thejuh:uz;:muu m6g5h*7wah c i0z ,b:xw 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 wire at each end. The scaffold is 18 m long. p6mtsshy+4jdxt*s: t49b8 cy A 650-N box* syytx+ 9s46th tc:p s8jdbm4 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 b0k;:ze 0 mwo-nh yyke)y 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- :em0why)o ;n -k0kyezcm marks, respectively. Where (at what 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 of weight 100 N and length 8.0 mepv2l7 h 9.ubxasa0j7r zxd2-. The board is supported at each end. If thxrs22jv77p9bza.edh 0xa lu- e 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 my6i zak :6e/u.j6 xzut, and a 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, xyu e.zji6uka/:t 66zafter 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 ai:angv k 2-z2ahhq 8t*re separated 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 horizontal. Assz-q 2a2a:k8g*vnthih uming 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 2.8 kg and its CG is 12 cm from th6/srurw-uj6rx6cjp+vlfc9w c 6/qg7hc2 hw 0e elbow-joint pivot, how much force mu6 rfgucq6rc9/jcrvws p 0- jc/xw6+62hhl7w ust 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 2mmqy w0.i0fb,)ex7p yd m .eh2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sidew.ye 0hb.dm0m 2)fq eipxwm,y7ays 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 7.0 m inr czxzd1;7k.m8 7 fyxs53lciz diameter. The top is 4.5 m off center. How much farther can it lean before itzcsd ;xmcx fk7 7r83lzz1iy 5. 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 0.00gwuer qw5q e645,spc9 25 cm. How much force would be needed to compress the block4sru e56q,cq9 g wpew5 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 cros xyh)de+ffpd(c+ep -1s-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- e xxidem*9mzc(+ 8mp 4.0 m long and 0.20 m in diameter. Ym 8 im(cedm ex-+p*xz9oung'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.dp2p( u90csouu y* k1u1 wz5ac20% when a 6.28-N force is applied. What is the elastic modulus of uac(uy251uwsc *0oz9ppd1kuthe 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 wisz-5e/ 4tc aalre of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus for steel - a c5z/sl4etais $20 \times 10^{10} \; N/m^2$.

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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 w32y :got)d*zch;.4tnvm qmonalking on crutches supports all his weight on the two crutch tips, each of whichy;qz *o3vt 2 )c.td:nog4n mmh 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 an arr mk8brsh/42. ,n kf 3,gxzedrea 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+c, az8ebwbe gvp/c9* and 2.0 mm in diameter supports a 10.0-kg mass. W/ v,a gc9+wbpeez *8bchat is the stress in the wire? (The Young's modulus 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 length and 2.x0i i)duvjh5 e0f 2+sc79lc rj0 mm in diameter supports a 10.0-kg mass. What is the elongation of th j+9fv7 0rcjie ildc)hx 20s5ue wire? (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 N is applied to one face of an alun4vn t yv3k5urf/7ar2minum cube with sides of 30 cm. What 5 rfr2tvn 7n34ukv/ya 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 the pressure has increased by pzmsrlwxgr2282 iiic e+d, 74100 atmospheres (to aboz+2i,gperc sr dw2ixm 2i8l47ut $10^7 \; N/m^2$). 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 tn jo7uwb e1ikf64 1:gis u i7:1en6ktf4 bgjo1w$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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