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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 equilibrium?m(u+4gxnbty+ (w9 32kto r yqe

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What condition or conditbhbk i2j-s- :pions 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 helc2w1k a*. qnsud at rest above your head the net force on the book is12 cqws na.u*k

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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 i.ohe*ys ,f-.5pn l5q o.rxpr constant velocity of 9.8 m/s. What net force ac n.he, o-5froryi..px5 q*lpsts 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 4snj8p1zzy )xb),lwe with one foot on each of two bathroom scales. Whz)sl ,zb4j8e1y px)nw ich statement 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 masslesse x)xdtkak+y )b/9a ghg7:2 .xwocd+ u seesaw. If they both move forward so that they areg+d2ycxk+/xe : w k)bat9aou7gh)d .x 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 its small end is infjiwm,s.0g/0 lcd +qc

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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 horizontc3b t8:nq vkf 7iq)o;cal 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 bricks, each of dimensions 20.l1q) 0potqbp)*v fa6 a0 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 distance that tpb p6tvq)1)ao fal*q 0he 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 t ybgbo:3m:.tx w:pmjg,f19fequal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause the tablexbgb.wptj3f, m1f : 9m: gyto: 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 ideno nn oc)rr):)e20nvsxtical wires made of aluminum, brass, copper, and steel. Which wevsx:0)n))2noornrc ire 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 r1htm *a*)au vm5 ey9oof 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minime*o)myu 9 t1*av5hamr um 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 compon0sqmq:.qb j0sent of the buttressing force at the base of a pointed arch iq q0mqjbss:0 .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 fulcrumcaxc,j qih)k6o2 s *2ffc;+bt 30oru y to the weight to be lifted is 1fostcb0o)26;j, qufh ay*rkc +23xc i .0 m. If a worker 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 t3z1o 8)uqwkln1wtn gfkl09u+t w+/ tso the weight to be lifted is 1.0 m. If a 3000 N rock isgw/ uw+ )tu lt+1tokn0sn3 9f 81zkwlq 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 arem z2u2j,+tzdoe67v sf balanced on a massless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m,d+6zevsjo22mz u 7ft 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 e.xp ihsvlrj+/z :y* 4+ior bc32her1knds of a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. r/s zer1 j:i+ hixrvbhp23.c4ok l+y* 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 two8ojn+ dx;cm8tv9 4s ot children weighing 500 N and 350 N, respectively. If the support is at the center of the board and tvt8son;m t9d8 cx4j+ohe 500-N child is 1.5 m from 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 wei9z qi t/.rmyza,t6:;ydo8k50k/z(iammwklj ght 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the be,5tq daz.6z:k0wr ilyza kj9 imto km/y8m;/(am, 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 tw3v d up5dcq6s)o ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the bea)d3dsuv 6qcp 5m, 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 eavg:k*k;ji ; asxlvq,or. uv;7 ch end. The scaffold is 12 m long. A 300-N box sits 4.0 vavr ;j sxk7l: qv,i; uk;o*g.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 lc p:emfr1py drtz/b(u*: /p0 a wire at each end. The scaffold is 18 m long. A 650-N /z:mp*byd/ rf1u( lepc: 0rtpbox 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 e/p7d*zp,,: z:ft w wpwicj;vrdge 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 third mass of 0.w:; j7w/ippc zp*:rdvt z,w,f30 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 N5jov (nd4)l7udyws5s 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 right end n ld od5jvs5ws(47 uy)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 b. 91afffusbez35941 t a ezmtey 2.00 m, 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, after which the right scale reads 30.0 kg and the left scale reads 50.0 kg. How far from the right scale ise9ze9134.fuetf5 sb 1m faa zt 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.3 /w)uuuif cw;1z8ikp 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 isw;wfciuupz31)i u/ 8 k 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 nthg0l0 )3bfv12 cm from the elbow-joint pivot, how much3)n0lhvfb0g t 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 whef9fbc ;poygu /nh1njs 4em8+8el base width of 2.00 m. Its center of gravity is equidistant from the8o8+ em uh4sny/f p;jbgf 19nc sides, 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 7.0 m in d7h9k zlh *k+) awjpiq+iameter. The top is 4.5 m off center. How much farther can izhk+k9+ l iqpj)w*7ah t 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 nor6)jp0 o eac63gu ch*.-1ctysbu 9gsteel block by 0.0025 cm. How much force would be needed to bch1es y*ja6.u -3goctg9n )0u6orpccompress 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-sectional area of 1f+nbwsv3g )(g $mm^{2}$. 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 statugof r8cqmbz1s1 smzy-v.q l*, e7e, +ion is 4.0 m long and 0.20 m in diameter. Young's modulus fo* .781mefsmyvbq1cl - ,eqoszrg +uz,r 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 y 4jg)rjqf(n(by 0.20% when a 6.28-N force is applied. What is the elastic modulus of j4)yq r(( fnjgthe 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 su :ddb3rtbs 20v 7fr0aqspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus f 2rdbq0v7b0sa:3dftror 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 xrhkip q++ 88hsupports all his weight on the two crutch tips, each of which is circular with a diameterx+ir 8+hqh8kp 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 area of * 5xdfr8*a el frjmi ,9ygos )3wy8q4q$1.250 \; m^{2}$. 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 lenf;a0ut54to* yiqrl vs09j0 fwgth and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (Ttw;tjflya0u 4 *vsq f90i 5or0he 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 m,q jowvqdne:y0dp. y;rw8j4ak + 4 /zpm in diameter supports a 10.0-kg mass. What is the elongation of thywjaz ;4+w/py84p ek: jqnv d,0o.rd qe 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 aluminuay.;8u 78;,ajft ctg adxk3q pm cube with sides of 30 cm. What yf8; pgkj.t 8daaqux;cat37,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 1u jnhlhiefyds-r v 3 b7f-1.(6030 m in the sea the pressure has increased by 100 atmospheres (to about-6b(-hf.n f7vhil syued3r1 j $10^7 \; N/m^2$). 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 st8hu bw57,bjwb3,/sric 8ts fgeel is/bir,7fw3 g bu, 8htbsjwc58s $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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