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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 conditiiipvp*)abj +kabr79(; pt( ba ons are necessary for 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 conditions are necessary for statipyixph*ynx-i and0: :1g:ce)c 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. Wh dk02ev 9lnkhvdx07 7xen held at rest above your head the net force on the book il7k7h 09n0x vkdxdv2 es

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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 constaxc *-yo pykv/*nt velocity of 9.8 m/s. What net force acts y**-xkcyv o/p 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 each of two bathroom scales. Wh bs2gf+mt *hzsp9xo,n2q- hm.ich statemb qhzgp2o.t,n2 s*9f xh+ ms-ment 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 *p kjvjfxq2 -ph +4.03b2jtmbaxcm p /massless seesaw. If they both move forward so that they are one-hjp-tm/q+32 2 .j*va bxpxkb40cmfpj 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 eneerm cc ov54 (:y-/jipd 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 horizontalh sjtm+r:f 4;6 wovl9*;vti bv 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 dimension2rrrck7uf3 ;j s 20.0 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 jk3cfru;r r 27over 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 distu,-)fbcb8bjcd z e/ -x5x;pdr ances apart on the edge. What minimum mass, plac 58-/dd-rxbb buc e)xpcfz, ;jed 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 identic; 4t/ mx/sgt6g)vuim nal wires made of aluminum, brass, copper, and steel. Which wire will str6ngu ;mm/g s)ixtt/v 4etch 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.nb3e;xe v.ddp.; od*r If the wire diameter were half as great, we would expect the wire to break when subjected to anr.d;.3 *e edbv;pdox 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 butrgr)9m br9 42azm) miftressing force at the base of a pointed arch is)f4mra2rr)zi99m gm b

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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 fulv,hcmb3sc a9c;p g ;)j* 3(. lwvs3yz -wcbsxocrum to the weight to be lifted is 1.0 m. If a worker pushes op wxmy ,wb9)c (bv* c;jcs3.zscv3s3 -a;olhgn 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 diz56 k kyzl*4nkstance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on t 4kk6l5zkn *zyhe 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 balana 7ucds c99;onced 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 from the pivot o;scnua7c9 d9 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 unifok0*8qw ++l, qo 5*ij pkxf6/fjczalc jrm seesaw 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 for the seea/xq 8k*zf,6kcjw0 jfll+ jqp*ic+ 5 osaw 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 ch,.t em 2awa;cxcc /tv*ildren 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 tt/w,2 cx;a vt.aeccm *he 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 two ropes at the endaz42 zr8op+w 4f9aylv50 okrgs. If a 400-N person sits at 2.0 m from the left end of the beam, what is t849zrfowkoly vz 2+5 aa0g4r phe 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 ropes at the+5 njur(4wrijvw 974nfq kn:8-kxib u ends. If a 400-N person sits at k rnw4 knjr4:j5 uwbi+nxq -uv(f9i782.0 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 endz2b2(6cdnbw)jisep99w2ikq np h5 1b f55m mk. The scaffold is 12 m long.n61jb 5 hs922e5dkqwf5p m z cn2mk)bipw 9i(b A 300-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 by a wire at each end. Ticf yj0p/8p.fi 2 r/p-ovy*xs yz uf,6he scaffold is 18 m long. 06c 8 y-oyupz/y,/pr *i jipf2sf.fx vA 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 supported x4at 0st6d0u :syd b5nby a knife edge at the 50-cm mark and has masses of 0.40 kns6 ystdd 0a4txu0b:5 g 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 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 10 t0 u6bga qnvst kxj2)4e-qq5-0 N and length 8.0 m. The board is supported at6gau4x 0q2)qke-5s - nvt tqbj each end. 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, 4; j,jkk;l e wn..p49 vwsptlcand a plank of mass 4.00 kg is placed between them. Each scale is observed to read 2.00 p nk;sjpcv49.4; . e,lwlwkjt 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 45cw x;9v f385hpxfywi(pj)c b0 m and connected by a wire. A bird of mass 0.50wchjf p5bx9vxi cyf3()58p; w 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 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 kgfw/b les;9 tx2e4v5ar 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 w54lr b/x;f92vate se 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 bldww 8nqc4qtl :9*i 5sase 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 maximumwd85q 9lli4 :*ctqs nw 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 5f067rxyy4 p4)uohyi c5 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean befo07u6 4yh xrcfopy 4y)ire 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 compressesrv1k 9 c*pn.f4:blesf a steel block by 0.0025 cm. How much force would be n9pevlf.bf:cr*41 snk eeded 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 lonju hg/rde; t6hw63aih pe94e+g and has a cross-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 and 0.20 m in diametepllym q:vm v7 z4mfn;*;g nn4zq.p.k,r. Young's modulup.7lm nk,qn* z.pgfvmvy ;4lq:n 4m;z s 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;c -)(unzk cof. What is the elastic modulzu;( )f-conck us 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 ledo3cdv 2 qyy2x-);bw tngth 11.2 m. How much will the wire stretch? The Young's modulus for steel ixwo-)cdqb2 t ;yydv 23s $20 \times 10^{10} \; N/m^2$.

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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 supp0 gcp 263x d+ya jgv0i/ul/ sqapgq::ports all his weight on the two crutch tips, each pq gc y jgqp/p0:sv/:3lu6i dxag+a02of 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 an area oq( rya/(rvo6/ s6ade.q6lq9kas a/ krf $1.250 \; m^{2}$. 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 :b/arnug46n03ty;to csdf 3m in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's mtcbngy t / 6fnoasd3 :mu;0r43odulus 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 suppulnw;rki ,5b (orts a 10.0-kg mass. Whatb,(;ri nkuw5 l 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 ane/:jvd l 8x/.h7qtump)4euee aluminum cube with sides of 30 cm. What is the resulting relative displacementpqeuel8e / )jh v.me/7x4d t:u? (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 t j:*y/eg7r 9g7 );*xob3ewsbogugel, w uo:czhe sea the pressure has increased by 100 atmospheres ( bog gexgeo3/c *9 uw:*z b,7sl e;u:g)jywo7rto 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 cmgv,dp+t4bil46 wgrj0gzk16 o . The compressive strength of steel is 6o1 kg pvt iw6r4bz+0dl, 4jgg$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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