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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 rotatp3m(oob*3e 3skq sc)bional 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 static equilibrium?uj(f2gv prij ,k2t *3+iesl -mjl p8)l

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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 ovm) ffh y+ enpw,*y-;ypwpsl0rh :;4jn the book i 4mfh,0n; wsj yrpvfye:+-ywp) h*;pl s

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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 constanrlneah1 qf,vt26,)ft: x o* xirjo4f-t velocity of 9.8 m/s. What net force acts on itf *rt: f xoih-v2fxn6,4traq1l ,j)e o?

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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 bathro+t r-v4wtfb6 pom scales. Which statement f 4ptb-t6v+wris 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.g:k:n.1ng2 g+er ccmd If they both moveg d2ncc.:rk gn1m ge:+ forward so that they 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 its small end ipsxupx)4jw qns0r7g5s)5c s8s 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 ta2 x8ha,oqp gmp+yy8dq wrjf2j,; u i3/bletop 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 identicaftv16yzg,uav-lrwrr 3 y:; e76a om)al bricks, each of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is staczr1 6a -;yevrm aytao3:)u7fv gwr6, lked 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 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 distancesy+ud0 ;l,b5l )dzcdl h apart on the edge. What minimum mass, placed in the mh;u,d ) bdz0ylc5 ldl+iddle 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 aluminum, brass, cop ,gm*ukl 3sxx5x4d lt1per, and steel. s ,u*lgx3t1m5dx4 kxlWhich 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 v 4w4 er 3l uj8hrk9/8bunodt.36 N. If the wire diameter were half as g3. uu8 l4wvek/nt4j9hd8r rboreat, 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 bafq0u.g /xhc2cse of a pointed arch i. 20cc h/gfqxus

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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 distanceix9coro;f-dqdn4 m1,/ sz +y p from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposq 19pmd+,-od4rny f oc;zix/site 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 therya4 ei oyp3c-4f-we + fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must4yee -yrpi-3a4wof+c 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 bal ce1pg2awwmll a.d1h;zb nh10 a2ls ..anced on a massless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2dz2h 0. sp;chw 2 wman1. aleb1.lla1g.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 opposi+ (k6y uxwo9cyte ends of a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits o(9u+ykw cxy6 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 weight 40 N supports two children weighing 500 N and 350 6)- hw+vlwc2i5ztvho. uqt5hN, respectively. If the s )o5- qhul cw+hzh5iwttv6.v2upport 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 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 1 t3vwtx *l7j26b tfymle8 *z,r00 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m fr*,xjlmzyf*2 63v 7 lwtretbt 8om 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*5/xe.;b-zej-crrw cq2 mp, cprty( r N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from yrez2--ex ;jccr/m 5crw( br* p,.qtp 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 eac/6p+/l7+fw:u - yjrrb opfakncn r*h6h end. The scaffold is 12 m long. A 300-N box sits 4.0 m fr 7wb6+ofrnn/l a yf:pp+c-juhr*/k 6rom 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. The scaffold is 1 4lq,3un: v ktl*yrs7p8 m long. A 650-N box sit y ,rkv*stu43p:lq7l ns
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 stickstmd6jw; k6t2 idxs) *m,t c+oqrkg,en8:rn0 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 and 80-cm marks, respectively. Where (at what mark) should a third mass of 0.30 kgq2t6ktgxr8j d+,id ;, *oms n0wsn:c6tm ke)r 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 m.7uh: t4f,:lm j/e id.;j ygncx 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 rightg u jm x7ei/d::ftn,4.l;hyj c 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 plavn 7p)o8ziu .ha. lsxuxa72r 4nk of mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person now lies on the pl7pnxa )2u7i lsuxorh.vz 4.8aank, 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 a wire08 hu9j2wxm4etvawfk 6tvq/+ . A bird of mass 0.50 kg lands on the wire midway between the pol8 w/hue xmft9 0av6 42qjtkv+wes, 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 kg and its CG is 12 cm fr4ro p(fkt 0 o94flk9w*i0hz hqom the elbow-joint pivot, ho090 op9 fq*hfz(h kwi4 4okrtlw 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. Its /+4 rldvwl -c41oql/j waw d*hcenter of gravity is equidistant from the sides, and positioned 1.20 m above cvj/l ww alwo dq*hd/l+ 14r4-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 tallv+ z ;baizj9 k moef jmv;ey2)k(.7ja: and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it becomes unstf9i av) ;emk zjjbozv27j ;eyam(+:.kable?

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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. po *0 8qygfie- How much force would be needed to compress the block b- *eyf0oi8 gpqy 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 andbk/1t9/:rvrme g:tqa qb e; ,:+gubd h 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 z znov )*)n)bqlong and 0.20 m in diameter. Young'ov)b z*q)zn) ns 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 igzky(5rp7g 6jo35 l lzs applied. What is the5r kgl76l zyopg(z3j5 elastic modulus 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 wir8z v ydglu.+d71 6epzxu(opx6fw 3uk.e of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young'sd1upgd(6uwlyz6x e uk .o8z7fp+3vx. 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 walm j4m6tzbc418wwy oife4ibzz, 5jg 9:king on crutches supports all his weight on the two crutch tips, zib4gmjwc: y4m86z,5 oj itzfwb491e each of 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 oaps 63pz30fb 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 inv e;yjxx eodmoh2q*jn+-b1) . diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for alumioxe +2m h.; jv*x y)-d1joenqbnum 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 26*7rerk pm8 yr.0 mm in diameter supports a 10.0-kg mass. What is rr7p*e8km 6yr 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 aluminum cube wf1fu 9tbyk5 a,ith sides of 30 cm. What is the resulting relative 5 fftk9,ab y1udisplacement? (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 i ;u2nuay *2lk9nvm5v pressure has increased by 100 atmospheres (to abok2vl;5v nyuam* 2un 9iut $10^7 \; N/m^2$). 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. udg,:s p+qx- pb v+onn0 y/kv6The compressive strength of steel is p/6skvv +y:-nxupq0d+ongb , $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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