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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 conditio+ +m5 nfbftl*s/)htuons 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 condruywl 1g1m6ht0i 8: 3l0jeqclitions 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 held at res8 0itpy4rxpjiwso h; i6/h/fe 3l+in+ t above your head the net force on the book issi / w08 o+i n ijih+y/;xf6ppreh4tl3

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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 sc.5sj2b1l *:o s 0hrf. beziea constant velocity of 9.8 m/s. What net force ij5bbr*:s zc 0l .es2sfohe1.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 stands with one foot on y0 pl3r czz3qsx:2em 6each of two bathroom scales. Which statement is definitely truec26z0 :r q y3lsp3mzxe?

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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 9c1m9o g+ xjmqwbac-:girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen mcox1 9:wgjqb -+ca9 mto 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 endzygzmij 1vs.7d0*zy ; 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 i34ng:u9 6+c vkkh+ssjy3g a*l7 gfmuajpb3.xs 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 cm xbg h y*ucfu0oh(34 ,pb 6.0 cm. One is stacked on the other, and the combination is th0y fp ,4ubghoc3*(ub hen 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 plac1nh /okvkh bx,. t8c0bed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, okx c1,nkhb /bt80.hvwill 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, copper, and ste4 af63r-ipg,o u4dzinel. pig,34 rfz -nad6oi4u Which 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 wher+zf fe;br 3913eupyvn subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to vp9e u;e 3yzr3f1brf+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 ints0)ge6p k4 n bzi-:g/:bdzof the buttressing force at the base of a pointed arch is-bi6gb) : nng /tp:0zdk4ze 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 fi-pco8 wq ohf/w-f6s+o x+ 6pdulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 40 +/dpx fwi6fo8 qp+6-osch-o w0 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 thepy 3c-w cqi;k,p0-xv c weight to be lifted is 1.0 m3c,wq-k -v; xiycp0pc. If a 3000 N rock is 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 are balanced on a massless seesaw. The boy has a mass1cp hw-ut1 c ja/k/4fb 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 c 1p-h cjabf/t4kw1u/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 uniform seesaw which pivotcxd*va-mllj ,vhb(. 3s in the center. Child A has mass 60 kg and sits 2d j.am*xlv,- 3hbvc(l.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 pn+o6s +ruq 6ge k+p5a40 N supports two children weighing 500 N and 350 N, respectively. If the support is at +ae go u+6nspk r5p+6qthe 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 100 N is supported by two ropes at the ends. If 5s,n-hnkqo w (a 400-N person sits at 2.0 m from the left end of the beam, what is t,h5 n(os- nwqkhe 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 dw*8g8 6egj-ymvqv: eported by two ropes at the ends. If a 400-8 d- 6:v8ewegmqy g*jvN 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 byl d45in fd52cf9 .arxk bd:a+u a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the lefi+:rdkd 45afuxl2n9 fac5d .b t 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 scaffr*e 8t)6y kyjsold is 18 m long. A 650-N ejyr8*6sk)y t 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 by a knife edge at the 50-cm mark atx*r2x x+ (qicnd has masses of 0.40 kg and 0.60 kg hanging at the 20-cm qxcrxt 2 (+*xiand 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 x y 3mnj5gg9bag6wwm+i:a) 9v a uniform board of weight 100 N and length 8.0 m. The board is sm+xab99iw36g yjmgva 5 ): ngwupported 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 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 plank of mass 4.00 kg is pl a khxf-0d+2dgaced 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 is the person's centd fad-0x g2kh+er 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 sepa ;k).negi d3nat.4 lyarated 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)aendi .g; nklt4a3y . 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 masy jsuk3f/ kb3aa6:b:qj 4tyi8s of 2.8 kg 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 lower arm to hold a 7.5 kg shot put (Fig. 9-au:j:yi/k f6k ajqtb8syb3 341)?


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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 wheaxxhr 5v/sg7 9+*v 5x krqn8ciel base 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 maximum sideways angle at which it can be incl8sx x+7r5q59v *h xkncivgr/ained 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 me 3ichxvtp vp qn9()1, in diameter. The top is 4.5 m off center. How much farther can it lean before it becomn qvxv e1(,hp3pcit)9 es 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 0.0025 cm. How much force would be 7 lwz x8g4yc4zpd * :s/1oloaxneeded to compro 7x41px*l /s:zgz o 48cldaywess 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-sectiw9 lx,/s q.nijonal 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 diameter2*q8z abbr v 9 rw74o5nu;qmbs. Young's modulus for steel isa bvu oq92bbwnr47mr;s58q* z $20 \times 10^{10} \; N/m^2$. 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 foce0k2y wr 9 rep 6fxv1afk-00yrce is applied. What is the elastic modulus of the kfka90cpfryv10- 0 wr6yexe2wire?

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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 lengtpeerj8* n3toug-s cc ,u nbiv()n23/ch 11.2 m. How much will the wire stretch? The Young's modulus p)b,ne 3v38cec cn-jru*n s2ut/(goi 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 on crutches supports all 0+,to3-yze7)s bsdl f tep-hahis weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on the0hs o7atzee+pyblfs )3t-, d- 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 areal ai*l;mcw+4 h 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 6ym,*a+dhv hllength and 2.0 mm in diameter supports a 10.0-kg mass. amh*+6 d lvh,yWhat 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 2.0 mm in diamex + /gwnl ka+ooq+e+a;ter supports a 10.0-kg mass. What is the elongation of the wire? ( xoon+kgl;e++a+qa/w 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 avp * 2b;xb:k ,da(bjpea* :sjhpplied to one face of an aluminum cube with sides of 30 cm. What is the rb(2; bpd:**:ej vs ahxkb,ajpesulting 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 100 atm2;+fuympvhzu +mf zg4upzps/u7- u 32osphere4+2 ugpmuyhz2s/ v -uu3z ;+upfz7fmp s (to 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 cm. The compressive 0/ gp+: qdhxk2cy(nug 1 /sam6qb*ns estrength of steel is +:u6 yqpb*smd0g(1 h egqn/c /2 naxks$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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