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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 rotag04pl:t2wf waz.fp i5tional 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 cond.f i)ynye ft5+itions 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 h8c(moa), wd*df+2rvu n z 9jkaeld at rest above your head the net force on the book jn , +v)a kf(oa wzd8m*cdru29is

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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 constant velocity of 9.8 m/s. Whauws9l m 286,ibe6eo7kuvd95 ll bi7ecwmt9 8a t net force actscome69eam 5lul968 ebu7t v7,ilb9idw 8w k s2 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 Ne(c6:fl/ mi: (bvcns9 llu8wr stands with one foot on each of two bathroom scales. Which statement is definitely true?cbr6i s/ (v9(lulwfml:c e:n8

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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 masslessbt9br qa,gx:f5:7ef *yxj;f 5 lsoh0el q)fy9 seesaw. If they both move forward so that they are one-half their original distance from the pivot point: b*yoj579 gatyr;:9xx e,fqhfl5q0s)l e ff b, 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 en17nn2ufas:y; wd23s)ct e f+7 ydbq yvd 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 tabl8njrg:6lsmj -z ljl.c6y.q1+qz i*cl etop 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 20.0 cm x 10.0 cm x 6.0 cm. 86; srk- zhii*wb zxmj1*hvc u8z+5fn One is stacked on the other, and the combination is then placed so that they project out over the edge of a table. sh+8rcj;b* 5vk8f1 iixnm 6zw*hz- z u 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 distances apart on lpf2c3 6ls: f;s0inntthe edge. What minimum mass, placed in the midd ls:nicp f2l3 n06;sftle 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 wi5: j2k-y4 ennsu t6ftqres made of aluminum, brass, copper, and steel. Whiche-4n j u2k5tq:f6ystn 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 te-t7,cl)u m*wuvz4yfqnsion of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjewm*f-4 cl tu,y)z7u qvcted 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 atper)4t km0.9 wdlmqi ) the base of a pointed arch isel. ikr9 )md0w)tmp q4

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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 btx 4tz, z7e; ln4tbn*he lifted is 1.0 m. If a worker pushes on the ;t*tzntz ,en47hbl x4opposite 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 dist c zkp/wg8+ aidt.1s 0 jlb)w3ee)-puiance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much forc+ae t8)l.w- pijzc3 sb)wegd1i0pu /ke 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 boyi27 ;bij9e./xujuqu a8la- /ct8eg cg has 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 auxibc/e .g8el -qj u;a97u gt2jc/8ione 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 uniformzsv6r3z7l e (d seesaw which pivots in the center. Child A has mass3 zdrsl(z6 ev7 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 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 supportsq 10s-ftus) zp two 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 3501fp -sqsu t)0z-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 weight2qouo b- i(atjb+r0 /m 100 N is supported by two ropes at the ends. If a 400-N person sits at 2./b-0tr2(u+ omjq oiab0 m from 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 100oa+zs ( 2ip)h ieqm.r ;r2hih- 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 beam, what is the tension in the right roiera)hhz iir.;m2p 2 +o qh(s-pe?

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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 ea5n (gxv ht(1dfch end. The scaffold is 12 m long. A 300-N box stvx 1( gnhf(5dits 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 a3g*7+ 6pmk+5p c:exsa; usb we wff;nqt each end. The scaffold is 18 m long. A6 q; e3e*a++sxswmpc wgfpu n f5bk:;7 650-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 mayu ;9w ( ah5(bcx2ngkbyi;hms u ow:-)rk 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) s ( mwu y(xbg n: o;-hs2kbh;c9)ywai5uhould 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 100 N and lengn5f rusist)+1 g+nj0nth 8.0 m. The board is supported at each end. n +0gn rjinftss)1+u5 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 plant. : qdm9yl a;ud7nv)d*8lkx xk 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 fa* tm.dq;an 8vyx9kd)x7u l l:dr 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 .llyy,eyx*gx sdha6 axc k/ b*4un6 5;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.yyublyhd6ne* acg x/54sk l x,a;*x6zontal. 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 armdgbn/s,z+ cn3 has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pidgnzbc+/,n3s vot, 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. 9-1)?


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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 center of gr y b clld4wse,9(xut9+avity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle a le d sw+l9tucb(,94xyt 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 dirx: ;c2wc c)n3: fc1ehiuj3k bameter. The top is 4.5 m off center. How much farther can 2b :f)3 x :ci3u1;khcr jncwecit 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 cm. ba+(qk*h)4dafvh za- How much force would be needed to compress the bloc()v4afhqa a- zbd*h+k k 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 ofkx+.cb 39ep yn 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 cz:rzy-14h s*fwryn:l 3 z f4iis 4.0 m long and 0.20 m in diameter. Young's modulus ffcs3 4f zw:14yzznr y*r:hl-ior 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 fo 9 j k7jx,jnqv+f8r-berce is applied. What is the elastic modulus of the wi8v,k7j+ x9jejrn-qbfre?

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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 st yo 0r,n*u-uf *zs* sozhir;7v k9qdxo7 ;+feuspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus for steeltvy+dz7*kzu *qf n; rh*7ooos 9xe; 0rif-us, 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 perslt gv 2.sl1pvtzhli/,6 29mlzs ;6g dwon walking on crutches supports all his weight on the two crutch tips, each of which /v6 s6v;z.zwg2m9i1t2s tgld p hl ll,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 mi / phsr uru(h* i+6.wwe0zc9of $1.250 \; m^{2}$. 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 auj)ykeyx0 z w:vf)) )dqrk6u*nd 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum :)x)*fuu0)yzqkev jrk6)dy w 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 md7e8 69,w3jmn ckm aqmm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (8 m9 7mk ce,6mawd3nqjThe 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 alumw1) /qlhdfaj:d4sc jb-5 b5 rz sot3wf3(eg9xinum cube with sides of 30 cm. What is the resulting relative displacement? (The shear moduluafl933 d(bs /5 wt-x w)fb g4djrh1e:5oczsjqs 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 001r a:skevgnbk 9 k d,qvt26pincreased by 100 atmospheres (to abkv9 106a0v gnpk2bq etdkr s:,out $10^7 \; N/m^2$). 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 steel .-h x3 hmop 3sq* x3wro3fsw)wis 3hxmsw f ho *q 33ro3wx-wp.s)$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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