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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 rotation(mgey1) tu3kt t,e 6on2nhy a(al 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 staticxfd8 1flgri/h:hiy5 - 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 rest above your head the net f1fv p:ioi ,0yaorce on the book is1 vp,i:afoyi0

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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 velocithg7m:a h*h.lapk-:v ly of 9.8 m/s. What net force :l ah7h:g- vmk*apl. hacts 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 bath ;(ypph)vx*h w-,sj3iat - rmwroom scales. Which statement is definwp(hw pay-j-h*i3v t;,x rsm) itely 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 masslesvhf jju36wtfaz bd5 )ec:cgjh ,,)y-(s seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen tzah,yvj)wfujb3h: cd c )f(65jteg-,o 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 i:fxgzaxs. i (p26fhc k6bwn1+ts 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 horizontal tablet *(s kn6 d,h.a,apctwkop 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 cv; xnzgg:s:/ bm. One is stacked 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 thebn: vgs:xz /g; 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 distances0 y 3r6dx8 pi1dqp9ktz apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause the table to overturn?i8 9td0yqx pp3k1 drz6

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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 madeua1h; oy beo.4 of aluminum, brass, copper, and steel. Which1 b4h.e;uoay o 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 foundxhkqty(2vz1wr8wiw7v3mr:+in1 i e 4 to break when 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 a minimum tension 1i rw :7i3( evzw14wm8tkyxr hv+i2nq 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 e 1b 3-kf2mzpabase of a pointed arch bae3m-2 zkpf 1is

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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 tojwktrkvf+r .gupe6.5:xi-3 b the weight to be lifted is 1.0 m. If a worker push5kup k-+w. .6 jgb v:3erfxtries 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 tn .ges4e -9u9ka*yev6yhf g c+he fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be gsf.g69 aehy+ -cn*keuy ve 49lifted, 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 uxr2 (-;7pnw yl1 yd0ffurln x25kv l,has a mass of 75 kg and the girl'r ,-u5x2f0ulwfk;7l( ynlr 1 xyn 2pdvs mass is 50 kg. If the boy sits 2.0 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 opposite ends of a uniform seesaw which h8xoggljy m989z/c 1e pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has x9yl18o/ cgz me8 gh9jmass 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 .nw*:d1wraemd*+ a qsk b9+u wgk9br 2N, respectively. If the support is at the center of the board b21dkwsw: a*rewag+.+ 9b 9*un mqrdkand 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 3+ z7rhnu2z la+x(osp0i ;qaj two ropes at the ends. If a 403 rnp+70a2o( +; zlauzjsxqi h0-N person sits at 2.0 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 100 N is supported by two ropes at the end ,y53hd /kechtpc,9j0p7csa2lj p r*ws. If acta0*y sp,hd 2pc,e/r5 37kc9j jlphw 400-N 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 b5:g(*ozbtx + mpnbih -y a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the t z(gn+tx-5 hbp :obi*mension 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 hez/nw0qgbs ,7y ld up by a wire at each end. The scaffold is 18 m long. A 650-N box g/7,0wnsqbzysits
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( ha0 5moq33nzbhi3k h 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 kg be hung to keep the stz(nhmibh3oq0 5 3 k3haick 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 wp7v-/0pbdkjvsglc*u yg(ou3 ,v*0 la uniform board of weight 100 N and length 8.0 m. The board is supported at each end. If the support fovpjg *(wo07v su-lkdu*/ 0 3l ,bgvycprce 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 4a1e e+ei0cu o/j)t *zw.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 a* wi)uje/+0e tz1aecond 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 separw.z*pc-0 c zxgated by 40 m and connected by a wire. A bird of masgpc- wzz*cx. 0s 0.50 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 kg and its CG is 12 cm frh; ltxjn5yg (a - ,*qpr.k.ennom the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert o- pl5k( yhtnnxe. ng,;q.jra *n 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 sy/xokcn2lx; 8: ln ml. y38mcgravity is equidistant from the sides, and positioned 1.20 m above the groundxlcl:/n82onmx; ck m3s.y8y l. 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 tall and about 7.0 m in diame 29o)3m2r72hcbqf-m+ k agzuqduiun ,ter. The top is 4.5 m off center. How much fartherh+zirnoq2 fqkgm2 d3c,u7-9bmu a 2)u 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 sf1+mdpblzfm j s)ojq - vts4+p.kc; (9teel block by 0.0025 cm. How much force would be needed to compress the block bypk+ tjmo cqsl1 bsj.+(-vd; 9mz4 ff)p 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 an t pj7kiog81p6f9pq q)d 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 loy p,fr ojb8f01ng and 0.20 m in diameter. Young's modulus f,fo r1j b08fpyor 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% nk,*g phpa l y.j+b))zwhen a 6.28-N force is applied. What is the elastic modulus of t) n*b jhp),a k.lgpy+zhe 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 mmwn. v:f0a7wywsicae ;z ;bd0,x5f6xp and length 11.2 m. How much will the wire str ;f wyfia;0xxcwebdz: 05avws ,7n6p.etch? 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 crutches s3:- /nwzlmfvq8uxw m*upports all his weight on the two crutch tips, each of which is circular with a diametv/nwmmwf*8x 3q -u:lzer 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 phj5lvny0 0 rn3m,/ hzarea 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 in diamete0)nlo 1bzccnw-w-+gne:v1rg /kwi o7 r supports a 10.0-kg mass. What is the stress in the wire? (The Y1c og-l wkiwez wo/ngb:+-r0n )n1c v7oung'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 lengtu84vc 5qlv9 0ltwj+ u*0+nkscz w(xeih and 2.0 mm in diameter supports a 10.0-kg mass. What is th49qsnxelv*jk wcl0ucwtiv+zu 0+5 (8e 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 alu :idx m5 tkzb6,1dgamcj,/,pqminum cube with sides of 30 cm. What is the resu d 5kb6jzg,aq :mxcm,ti1d/p,lting 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 theu,hcc4d sw /g7 pressure has increased by 100 atmospheres (to ag7uh s4 /wdc,cbout $10^7 \; N/m^2$). 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 compressive7y2zt:wc1utn;x7n k8hlrn4 (qgc uy 9 strength of steel is28 thr4(zqy1 ; yu:79nt7kn lccw gxun $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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