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习题练习:Physics Unit9: Static Equilibrium, Elasticity and Fracture

 作者: admin   总分: 44分  得分: _____________

答题人: 游客未登录  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 rotational equilig g+)mod8ynwsks w50t*(p 5:sz c7iqgbrium?

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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 dofi/dv7 tc*-**l: etr fap 3tnecessary 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 tyuw-m5+fi/u at rest above your head the net force on the book is mu+t-f/i 5uyw

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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-5 l(jow is)rt space with a constant velocity of 9.8 m/s. What net force acts on it?)r5jolsw -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 bathroom sca1iiw01i h tq*dles. Which statem*0idqwt 1i1hient is 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. If they both y a*.o2jml06vsfv( drmove forward so that they are one-half their original distance from the pivot poinm a.df0*6jsr l2(yovvt, 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 ,*m anzc1 cq *v1zraz6small 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 tab*jj7w jv e vf.7q5a-yiletop 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. O,8gf1c7w3 lmuix;h vz ne is stacked on the other, and the combination is then placed so th;3mxhzu187cg w,vfi l at 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 e5 ;,d ;tur8z( gkz hczeuc9ry,qual distances apart on the edge. What minimum mass, placed in the middle between two supports on u5h(cr9 z gz;8uzdy,,r;teckthe 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 iden +o zq2 h;8v(rtf:xdkjtical wires made of aluminum, brass, copper, and steel. Which wire will stretc dx2j t8hrkv:f(+ ;zoqh 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 bqpk9nq;7 5p xqxd4i,hreak when subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjectedkx;59,iqp q7h4q xn dp 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 base of gnw6:(o p kl:i 7szq(ik2 d7,wsc 2ieoa pointed arch iswii( iwq:e 2onk77ok (cds gsl :2,6pz

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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 fuls 7ec w.3wehev.z-p2gt:. ckfcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end wit- vk7s:egf23 .ewpw.hc tcz.e h 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 fromw x* sqqkn*c 8c uh/awl xo62)sp,o-r6 the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to px6, wqkr2 lqc x-nw*h)so/ sau*oc86 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 6c 7oq 5ro47h89w td aox4ean7an7t ptbalanced on a massless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.a6nw47xa4 7oarn 5pqo8ohdc7e 7tt 9t0 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 pivot.w53 ohh. vbsls in the center. Child A has mass 60 kg and sits 2.0 m from the center.s l5 .w.hvboh3 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 weijjqu3kb9 ;sd, dv 4 :3ffogkk4ghing 500 N and 350 N, respectively. If the support is at thk9,uv;jd4gj34kf3 :fkoq sdb e 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 tn/c ytmpm 1.9cwo ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the bpcy 1n9.tmm /ceam, 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 r:rh,uw) eyy z1opes 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 thehzre w,y1)y u: 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 end. The scaffold is 12 m lonu f67,ts* edhy3-g6z7zxw xangngtxux7,z-3zw6 e dyf6*hs7 a . A 300-N box sits 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 at eaci9 equo6wehc.44 4v vrh end. The scaffold is 18 m long. A 650-N box sits469rvuqh i .ew4ecov4
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 r1+unp7;k ph xsupported 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 ma1 k7;hp+ pxunrss 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 unifoc e0zv94mltb9 .qiow p76 y;75icjn iwrm 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 b;o 7tpn.i7eiwcjl6 4qcvm yi59w 9z0 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 )ag4l- erdgg)l, :4ucin8 yprw h,n(okqwk9+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, after which the right scale reads 30.0 kg and the left scale reads 50.0 kg. How far from the right scale i- 9a4c g48:ghln,yqwu pwk)+ o()l ngir e,krds 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 k ike6n4ei6cmv8l d/f6 +kwp(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 horizontal. Assuming the wire has negligible mass, what is the tension in thev6d+ki4mw6kp ( e8l/ 6eicfnk 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 ar3e 3s(of 7.l/uktnpi rr m,3wkm has a mass 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 lo 3n u,k7(3.pi errfws/ktml3ower 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 ofp)- ajdvmo(g0 2.00 m. Its center of gravity is equidistant from the sides, and pos) pga0mjdo(v -itioned 1.20 m above 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 tall a 1fu; kgo4kx)ld5zp3-5z5; xkczpt hrnd about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it becomes un-l p) kr1z pg5tkfdu;x 5k4z3;cxz oh5stable?

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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 bp0;kq r;ntwt*cf3/ i flock by 0.0025 cm. How much force would be needed to compress the block by 0.0125 fn;;fptcw03q* kt i r/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-sectimwls vv jh()).sbd/5e onal 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 sk/ hi 3ue9 we/czz+oq;ervice station is 4.0 m long and 0.20 m in diameter. Young's modulzcui z /3w/k9;h oe+qeus 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.pz0c,zoi bnkkk ia4t/;:j 7)f 28-N force is applied. What is the f:)k, kaip0t nkiobz c4/zj7;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 wire of diameter 1.0 mm and 8iqsml67.wxydtp4 q/ eey3;t length 11.2 m. How much will tqpe.dyx3;t8 ts/i l47qwmye 6 he 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 pe jw)ca 1r*xlh; 6m+zowrson walking on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted ohx6z* l+c j )woar1m;wn 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 vhmt2 -4iu w1 rsde -3hbc-ur8of $1.250 \; m^{2}$. 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 lenz 1kzd3gf ,ipws.l/xfko .yy/wro6c4/ x :qv*gth and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus focx 6zf /o*osg3/iv/wd1y,.p x rzk y.4f :qlkwr 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 supports a 10.0-kg mass7nj ;hfs xgk/at5g7)g-sn jn c5r)iiyc-ny)0 . What is the elongation of the wire? (The Young's modulusy-y c nh5g;-0nct /n5 gii x7ss)7a)jrngfkj) 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 i (rjjnf- mmd, gzykxxn(9)1j0 s applied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for ygmz (xd9,n (jjn10 x-kr)f mjaluminum 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 presue8noab. pk 44 znc.v:sure has increased by 100 atmospheres (to about 4.o4 bzvcnen:.upa8k $10^7 \; N/m^2$). 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 jj hlrk d41);dsteel is k h dj1;rl)j4d$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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