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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 a yrtz/ l(t+jzzbqh*+ 8re 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 conditions are necessary for stj7thv) ;*pwislx hp 2.atic 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 helt6( y 9kw0z-:ruew2/to jb,kohl f.add at rest above your head the net force on the book ihoel 2bu,krw.w j9/-fytazokt60(d: s

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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. W(,8cbtjliqd* tx99 fvhat ne c,b ql9ji(v8d*t 9txft force 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 each of tw j4oa*bwof,dd)*-m cs- q v+cno bathroom scales. Which statementa +b-d d,w*-fqnvc4 *c)jo mso 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 lightx2t g i2+7lg,suhg)hc girl are balanced on a massless seesaw. If they both move forward so that )uht gx7l2,2shic gg+they are one-half their original distance 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 its smvf ym)p 8;van/all 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 hordv(t q rt+kwap0-x,) (vsu2 jeizontal 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, e *idpz.8 blvjw5t g j.7ad;b57grw) hqach of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other,gv wj7p b;d brg 7qal8*.wtj.d5i zh)5 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 suppo xrp8 sxo5z q 9zj9epd6l,08mnrted by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will pm8 xp,ozez90l5n6 9sdr xjq8cause 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, q,(znwh h )+jjcopper, and steel. Which wire will stretch thjq,)h nzj+h w(e 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 minimu 20c:.x:sr d u)dxnu m8a9y ax;cabze,m tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when sub uza.;mxyd,ca rasxn98ud : 2)bc:x0ejected 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 buttrn.559wqjphb 3yu2 cx)hch*d kessing force at the base of a pointed arch qj5wyk)b2hxd pnc* 5h3 .ch9uis

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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.p y:txl7iva.9 The distance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes iax9l.v:7t yp 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. T0bsrnwh6 s l 6yqx. d)c lto+v2d+j,+zhe distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must bel w+zqn ,crs+oxd.+hdsl0tjvb)6y 62 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 massleso2nbf1d: bd2is seesaw. The boy has a mass of 75 kg and th bb2did1:n fo2e 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 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 whoo6pz1:t)qha uj9v4o ich pivots in the center. Child A has mass 60ah outvq:9o16)zj p4o 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 weig0 dh kh :kyoxs4cuf+p71px *pxs2a2v3ht 40 N supports two children weighing 500 N and 350 N, respectively. If the support is at the center of the board and thpk4x*kx1 o2 a+2 uf7h yvhc:ps0 s3dxpe 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 r 3ez+2ax* vqdx2 y9fxnopes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, wh yz 2+e9x*2aqn3fx dvxat 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 e; s gx2jsc( rf0tfa3(1jz9lxweight 100 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 bea30a2 sz fc(9jstgl ;xe(jfr x1m, 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 h9hecx5 (pesyy 3ji8g6 eld up by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left e8jgisy5( pceh3x96y 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 scaffopkoahb,,t o:a5r woi1aj 2 s frm526t)ld is 18 m long. A 650-Ni,ohw5ot p m f:sar1a5obka6t2)j2r , 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 m;k* 8o c7m9c 6nhg v/ez2brxwaark 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 ;zkmcb *ov2gc7xa/ew6hnr 8 9stick 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 boarcqwb .yz 5 k96. :w7f( nbu)t)duncpnmd 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 thr b:ndcuzyn.w). nwt6p 7b5 )qm kf9c(uee 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 6py g;yo4k(e . knyxz/4.00 kg is placed between tn46 kegp .xzoy;y yk/(hem. 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 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 4 -ia-m6r-)zypmy fc +w0 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 sag 2.0 m below h f 6w+)yczmry--im-aporizontal. 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 -0kl skqv+ h8fzr(e3q 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 qq3 + zsle0h8-vkk(rfa 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.u qmf:a hn+ v)xveh,9, Its center of gravity is equidistantahe,fm,)h v+u vq:xn9 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?

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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 diametbn g 1 hwiz2kgemhryhf54(9kp;7. ;p ier. The top is 4.5pf(;h 4g r9k2ing7i eyzp5h kmw1h. b; m off center. How 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 cm. How much force would be nbu+5:nfbinok+n( 3eqeeded to compress the block by 0.0125 e3+ufnbqnb k(o:+5 incm?

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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 long1,syilq h39c l and 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 lon/i +n/gvh 8zior96r oyg and 0.20 m in diameter. You y/8hr+gonr oi9izv6/ ng's modulus 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% wf48sh lrw 8lek9k u,ecj,kp:t *67h ivhen a 6.28-N force is applied. What is theev,kkjk76 :8wfc ulr 8hplei ,*h4st9 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 diametj41 v:e0 x6jwnw jw .9ll;dtnver 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus for stvjvn j1wd: 6wxjl9l; w.etn40 eel 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 akh 1rnfnb7. 1ko*9xs jll his weight on the two crutch tips, each of which is circular with a diameter of 4.k7r 1hnxb9n fosj.*1k0 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 of e5 igrvu f14a8om we (z/1mxm*$1.250 \; m^{2}$. 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 diamete 0gkxaw51d+w5uve 7x u20h fgnc9 oq+er supports a 10.0-kg mass. What is the stress in the wire? w59fqa x kou 25g0wn0eueh +g7c+d1xv(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 diameter supporyf9+qvq7 m q+u-hzl 5dts a 10.0-kg mass. What is the elvh+9 qfz-um 7y5q +qdlongation 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 alumiep erq4 p dqj92/a;8d6qfa5hqnum cube with sides of 30 cm. What is the resulting relative8fdpa;pq ra/5 qjq edhe9426q 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 /i* sek)x,jm yatmospheres (to aboutsyke/jx) im*, $10^7 \; N/m^2$). 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 ne-jf.i ,z u/ tx,3nkjewd8:n compressive strength of steel is tinjxun3, zw/ e,n8f.je:-kd$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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