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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 rotatiwboj94dh z/5irlm:p 39,djpxonal 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 nec3h6vm n4;yur-/cx7 fd- xtuugessary 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 at rest above your head the nevfy: 1xf s5du.t force on the book isy1f :vud5xs.f

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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 constan5mhqc49v yx q4t velocity of 9.8 m/s. What net force acts o 9c 44vmyxqqh5n 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(pmc) ;pomnes6 ,,pg y N stands with one foot on each of two bathroom scales. Which statement is deogs6)n p(;,mcpymp ,efinitely 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 bah w)1j/mz2fht m k*-obj8n(+tkfrs -elanced on a massless seesaw. If they both move forward so that they are one-half their ornrk/sobtej j(f1)82kmhmtfz -*h + w-iginal 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 i*ohb(x4w/ ,lhj73 zkh k lbp:nazc8g;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 horizonta/ljjr*(n0mm7 c 0lio ll 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, each of dimensions 20.0 cm x 10.0 cu)s z wrtsp639m x 6.0 cm. One is stacked on the other, and the combination is then placed so that they pr u6 9rs3)zwstpoject 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 0(ovvl6yzvuc5 .v d k4is supported 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 cause th0dl(c yvzvvv5kuo6. 4 e 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, copper, and,88..i)kwv ule(teq jyf8l l7s 8kcxr steel. Whqyruifejklv w. ,c(k7 .xlts 8 )el888ich 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 mini+t-c)m o.ep. nhdg+hn mum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when so)h+p -dt+nc..ghnem ubjected 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 componentv.7 pa2e*yfd, yrjf ycy3f2 w1 of the buttressing force at the base of a pointed arch isac w3v1y fye j.fdp *yr7y,2f2

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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 be lifted7t ;nbv ,trlpt7gq5c2 is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can be lift2rvq7t t7gpt 5n l;c,bed?

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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 the fulcrum to the weight to be li:;7g :i5 g* ljkj4pnt *e7j1bii jfspwfted is 1.0 m. If a 3000 N p*i7jp;ji4seg1 b:ik*w7 5 nlfj jg t:rock is 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 has a mass of ;c7nt ps4xz+jcgp( e)9 ksfmma 5frn+n1yl92 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pymk 5 tc(r94p2xe+fzl sgs;7mn1a9f)nj n c+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 uni 8lvpptfj1fxv (z h9()form seesaw which pivots in the center. Child tph l(ff zxj)(8 vpv19A has mass 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 supports two children weighing 500 N an/ovyc p1y)l4 zd 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 y z/lv4cy1po) 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 ropes at the enlau i8t9wt7l.ds. If a 400-N person si7ta8wl.t9l iu ts 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 eg3m.3vocsambm-1:z n5 5ebkof weight 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 the5-g3. kzo 1nev a5mbe3scm :mb 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 ,r+aw 3)f2g6v6ty j;ewyhaxa end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is6ythjxrgyeav , a32fw+6a ;)w 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 1 fhql jcy*52;q s:axqup by a wire at each end. The scaffold is 18 m long. xjq5;*a sqqc1 : lfh2yA 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 ahi5 r0 ++vmc5vq k,xcftt28wut 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 whatu 2m+5c,xt fv0 t5qihv+k8crw mark) should 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 onz4kmg5t,qev: *v+ al,tc al 6g0uu -xa a uniform 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 f:-vggvx cl aut*kl,zq +,ta046ue5ma ar 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 4.00 kg is placed s;)bsa4ej mn;fq 2qh jok6j (n)*a1ojbetween them. Each scale is observed to read 2.00 kg. A person now lies on the plankamh1n)s)2(bes noqf*4oj qjj a ;j;6k, 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 and connected by u 6j- 9okqn z6vw:kam1a wire. A bird of mass 0.50 kg lands ouma:kk1o6n9z w j q6-vn 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 from the el/mtul8s gua2vq *db)c0 f;0p*am(k8l 6azhnjbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shoqmf68;0)p anh d*gs0tvjlumal 2*u ckb/za (8t 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 gsglsg4jt1ga56r tcl6v;5. j gravity is equidistantlg6sgcgsj;j55 g4a6.r 1 vttl 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 at )h+6obdg( nrbout 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it becomes unstable?onbd(6+rg ) ht

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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 daup *-tvlx9r:lr,kj ro82: q much force would be needed to compress t*j9a8rvlqtx,oudk2 rpr- l ::he 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 han*jx0xhsv*) xs 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 sta(u z sm17exv):x +cwum:z/rlztion is 4.0 m long and 0.20 m in diameter. Young's modulus for steexu(zcml /u7sw:)ervm :1z+zxl 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% whenaqk o rjh)b84: a 6.28-N force is applied. What is the elasta:r b)qh 84ojkic 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 lex,)j+g qgp rk1z(osn4 ngth 11.2 m. How z(xkrp1 4sg, )g j+onqmuch 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 waqsye8f3 5eb 9m iwelk-5h:.rilking on crutches supports all his weight on the two crutch tips, each of which is c :qefr9hm3-ibi 5.85kywlees ircular 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 l +le-d)hzr8 ) ps;zpxy 2wbv4.s8wcpof $1.250 \; m^{2}$. 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 le w4e zdo52t/r+lejt2g6,l 6poyecz+vngth and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulu+y22oler ztj4e566w+pe z gc,dot /lvs 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 supports a 15n4 ,ec ojsklf /1f5fn0.0-kg mass. What is the elongation of the wire k5o,ef5/4s ljc1nn ff? (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 aluminkzgh+o8ibo47h,fg. pa*6 g vqum cube with sides of 30 cm. What is the resultina7f*g 6bovgkg8o,zqp4 hh. i+g 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 in1xr, uj/jd dqf6vw,s -creased by 100 atmospheres (to abor uv/sdw x,6q,jf1j-dut $10^7 \; N/m^2$). 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 30vrywoaw 5)exx :cx)o)1m ne) ( cm. The compressive strength of steel is eem)vo5c())1 xxx aww) o r:ny$250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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