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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: 游客未登录  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 equilibrium0gd2ojv3k v j2?

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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 for static equilibrium mv3f-9 ,;9tt xfpjjkjnmioc)38 akt*?

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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 on the book i+i/e tz b;ct7i ib;/i +7etczts

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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 ouv:)2xa6d freqter space with a constant velocity of 9.8 m/s. What net force acts onvdf 62qrx: )ea 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 foov -c,afbh e.ib.(i e6at on each of two bathroom scales. Which statement is defaeb(-c6 ibi ,.vhe.afinitely 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. Ifzf f, u:ix hc59jog0p ur26r,d they both move forward so that thf uj2 z hgx9,r:fpiuod0,r6c5ey are one-half their original distance from the pivot 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 itohl1 xkj1.0l iqiqozp;( 7yop kc825zs 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 tabletop is 3h5)m-hje j6os7lhc qin

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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 cm x 6.0 cb f5 a1-i2 di*rbixk2)cr8g rcm. One is stacked on the other, and the combination is then placed so that they proid*5rr-ibkcb) cg r8fix1a2 2ject 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 equal distances apab (wmt bbp,fd0 ()u3nlrt on the edge. What minimum mass, placed in the middle between two supportu ) pm3twbnb(f,db(l0s 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,zom093:w(. n nlgga;sq*ey d*y -jhw p copper, and steel. Which wire will stret0wze*o*d q gg.hl3snjy-:n a ; (pmyw9ch 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. If tt6kn qrtcowa 2 ia)jbz5w +ilq190(h(he wire diameter were half as great, we would expect the wire to break when subjected to a minimum tensionrw5h0laq+)(i1 nbot ktjcz6(9wqa2i 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 pdl0a gl6- 31cjd ++kqeyfa. uqointed arch isy 1k.qglqade0a6 ljd3-+cu f+

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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 theqwnu/mb b5,l;1a3qtl weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N,wnbl/lab 3,tqq5 u1;m 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 weigh r6izquwg)18oc aqmu +3vj0h)t to be lifted is 1.0 m. If a 3000 N rock is to be lifte1r8o3vmw0ja) i hcgquqz 6u+ )d, 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 boy2-/fyl7idmm h 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 thh-m7 dify2/lme 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 pivots in thymsvkm 9mg-396i7 gf r32lv tde center. Child A has mass 60 kg and sits 2.0 m from the cent i6 m g9km397td2lvg-vfr3s myer. 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 weight 40 N supports two children weighing 500* sj52mf nz 4i2db(nrv 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 cv22i*s4 mf(rjd5nbz n hild?

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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 r*cfibl-*p8/bn4g +d)nfmz b 7yst .n two ropes at the ends. If a 400-N + *sc*bb4z7-rb )tn/p yffiln.m8gd nperson 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 weight 100 N is sup;w - yexoemyg(x*z,5nported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beyo, em;we -*x z(ygnx5am, 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. Thlz.jtf cerw79*.0 ftoj .y 7gge scaffold is 12 m long. A 300-N box sits 4.0 m from t7ftler7yco.* jg 9.g.0tzj wfhe 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 e5;)wgqtxvh uvd/0 v. mnd. The scaffold is 18 m long. A 650-N box u.mxvv5gq0dth w /v); 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 sticr//s kjz . ie/ril0))jjivlz, k is supported 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 an j/l/jierj,ziki .z)r )s0/lvd 80-cm 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.e ,o8vwxg b3p a uniform board 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 that at the left end, how far from the righe3.g o,8 bxpwvt 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, andlal(sy1ncc+p v -s16 oy wn;;q a plank of mass 4.00 kg is placed between them. Ea( ;owl nyn1;y1v6cs-+cs lpq ach 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 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;vy +,sjkxw: u 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. Assuming the wire has negligible mass, what is the tension in the w,+juvy;xws : kire?

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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 s472ksvyk wx1q) ;mv h9e3zpg CG is 12 cm from the elbow-joint pi 147g;3z yhe ps2vx9kms vkq)wvot, how much force 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 m. Itshk4e oc.0 8lw6f 7stmopfa,yx.n m/r( center of gravity is equidistant from the sides, and posin..h( ot8crk 4fw p x7omms, fla06ey/tioned 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 7.0 m in di)2 ju .m gzlwbhqr d2+nyy(;u)aeowv3yb.k09ameter. The top is 4.5 m off center. How much farther can it lean before it becomes unstabu+0w yrolk. y)m2 ;ndbaw 2 yg3be9)( vuh.qzjle?

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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 foraivt lrl 00azkf76:g8ce would be needed torlf vi 0ta g:0z76al8k 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 cr9m;0szhc(*bm0l5, t jhoxtob oss-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 :)wb p;j az wdlg/5b4gand 0.20 m in diameter. Young's modul/4; bgzbg)dpl a :jw5wus 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 st bxdz5wgi2w 7ps)(ski4r;xx (8gkf3 :fc bop+retches by 0.20% when a 6.28-N force is applied. What is the elastic fxo )d;s437:5 wi sb8r w+z2cbg(xpk(kf xgpimodulus 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 qur lo rkxd-qba dr*) b42*z69diameter 1.0 mm and length 11.2 m. How much will the wire stretch? 4b rld6* bx2)-uor*rdkqa9zq 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(i*tfzg4t7t dth2u *h on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4. t*4hf(gt u2*tiztdh70 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 aref)se9x da5td w zpxi+(kf/(q/a 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+ajjw4d 8l5 g6m k:pvyupports a 10.0-kg mass. What is the stress in the wire? (Thpjk lm6jg5a+:d v4w8ye 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 2.0 mm in diameter supports a 10.0-kg mass.7 c:. qn pyvszdk/3kw7,.iywk / . ckwzvpkk7yndys.:i qw, 73What is the elongation of the 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 aw-h 5lcq c 5p azl;;okg .p/6o2m8kthzluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear mod hka-lwzcpk; ;2o6ql /h pct.m o8g5z5ulus 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 i5:;o -axgs3fsrk4 g- ft- oouqn the sea the pressure has increased by 100 atmospheres (to aboutf 5-fs o4x -qota- gsug:kr3;o $10^7 \; N/m^2$). 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 5zatp11nl e qnt7 .p0pdiameter of 30 cm. The compressive strength of steel is.p11 attl ne0 z7ppn5q $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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