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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 for4l +zg t32.tvm0z ksdj 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 static equilibriu nh(o-9afvig29zy5/uws.zmr m?

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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 forc5j ::,nkmtjl7ijh) bte on the book ijji,:) t: hbtln5mk j7s

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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 +yp fdlaxln*x29 -)sy 4h-kud space with a constant velocity of 9.8 m/s. What net force2-lxlf4u)npah d - xdk+9yys* 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 f6a()4ybsx.o fa 8sypn( lnwfh zo529)ycg2hroot on each of two bathroom scales. Which statement is definitely true?o(4h2poc9fays sn56 8y2)g w ()nblraxzf. h y

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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 seesa*3 le6ph4.q qn zqz4n-bv jar2w. If they both move forward so that they are one-half their original d2zvnb3j q rl.-azeh qqn44 6p*istance 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 itv5gbvc/aij; 9 s 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 horizjhbyhr+yh t 6y 9n6)(oontal 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, eac bgfjay ) h5sj./eer/4)fkq,h h of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, b h se.yf4jeh,j/akf r)q g5)/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 -cz .r 65xyh5 1vx5+ieyqhomf equal distances apart on the edge. What minimuyhxh v 655ye+m1ci.r- zoq 5xfm mass, placed 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 pc,c/jxt* sy:ru( f*p identical wires made of aluminum, brass, copper, and steel. Which wire will stretch the leastc:*c(txp *rspu, fjy /?

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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 tv57z .kpt; hyas5t .opension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subj;o.5pvk75taypzsh. tected 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 tpjs;c1cdn h0+p j2t)q57 uq nahe base of a pointed arch is )sap+jcun; 157q2pqhd t0jnc

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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 the weight to ,zg3ue/wtadnpzjohi:/k3 5 a- ,w( q:: snym ebe lifted is 1.0 m. If ajosew ,p3qd/5wzm:(g-ku / z t h,e3a::niny 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 theit; vh1;(oley-b ik)f fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock isfi (lkv1yihb );;-t oe 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 h1i e92c2 z yyublxs3p5as 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 o32yxl19 c5uze yip2 sbne 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 uniform seesaw which pivots in th/e7g ,5rlvvzi z-)i dle center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg. zi-veid7 ,5z gr) l/vlHow 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 twovff((mmw)rk )+:cy l v8pz4tg children 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 the position of the 350-N chilfg vl:m+rt() p8wcm)4 yzk f(vd?

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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 avk;-,x qglbfk/t laq8(rza, ps.,v/t 400-N person sits at 2.0 m from the left enatbvvx,t/ga;8-kllqzpq/ s (k.,rf, d 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 m7;(i fqgw bkj4m 8ke2supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of themi4kje7qw8(m gkb2;f 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); az) zjfv27 ijb8wvmz+rsz; end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in each wire)j vjz;)i wzz8frb+ szm7v2;a?

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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 18 m ln 7xqz.m-e6xwhb:y *gong. A ehny. x*w:-g6 qx7zmb 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 by a knife edge at the 50-cm ygk/dv8 m ;h+ez mbu2li:(p)wmark 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 kg be hum:(yih)e8blk m+ g dvpw;/zu2ng 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 uniforyf gno 4 j xh pat0a6t6n-8*.flw) js3wvz:*fzm 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 right end is the pers x f)*.zn6oh4l wnwat*3 zfsj-60ajgvyfp8 :ton?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two scales are separatedk:pysqi *+cz5 by 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, : *y5qcispk z+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 +)kwfh urp s)q3,es)y and connected by 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 hori) y)qw)phfs+ekr su3, zontal. 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 ma1jixyi 9qa,h3ss of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle iahq,y3j 91 ixin 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 out 0lb5zfa5 ii.hh7)e xwlh pd1ux0 :o0fer wheel 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 inclined without tipping over?ph x :bxi1d0iuf.)007 wh 5hlzafel5 o

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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 jh7ij-v )wpf*Pisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. Howv)*ifjph j-7 w much farther can it 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 steel block by 0.0025,4;lpp.5 ljztwcm uo . cm. How much force would be need.ul 4tp;wl5mz.p,cjoed 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 long and has a cross-sectional area of 10qmpbv3;3 etj $mm^{2}$. 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 diyu:fv- ix:+idq+g/ g4bt. zbiameter. Young's modulus for steel isyb/q+4xig g:.:+d- fuzvti ib $20 \times 10^{10} \; N/m^2$. 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 3yd 8i8/ yuvmsu x0s5bapplied. What is the elastic modulus of the ud0v y58 si/ bxy38muswire?

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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 lengtb-hgofpia g53mq7 z k1mp3 -0wh 11.2 m. How mu g k0hm -w5 13fo7qai3gpzbmp-ch will the wire stretch? 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 on crutcmb;nsa;.n v 6nu8 g a2rnw;4nyhes supports all his weight on the two crutch tips, each of which is circular with a diameter of unv; na;r8. ; b6mayws2gnn n44.0 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,hl( 3lnj;v6ydme6sj 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 anu1yn6 pp,j 7t6 ,scskqd 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Yountky6,p1csnqu6s 7 pj,g'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 suppo s6spzjb4k dpc:h cmj/-lu;m29z 3qd0rts a 10.0-kg mass. dzcspd/4-u0 h:sm3k9bzc ;j2qpj m 6l What 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 appl8.6n ds1q blpeg pxt0*ied to one face of an aluminum cube with sides of 30 cm. Wp 8qtbpl1ne6d*g.x 0shat 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 1030 m in the sea the pressure has increased by 100 atmosphemr8t0mv, o3drq )r85 y/ iwclcres (wmldi)03y,8 t5mocrc 8qrv/rto 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 l9eh+i w8o6sfdiameter of 30 cm. The compressive strength of steel is i e8owsf9+l 6h$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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