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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: 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 ww/d*dj eb d)9rotational 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 static equ*3m3fyy e bvr*w;vh)m v**gbjilibrium?

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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 force on the r id4:bbm05v hbook i4 0bvdb5 :ihmrs

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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.cz9yux f ap0f ,x927eq (2udy ps2sjo*8 m/s. What net force acts on s,yfqp207c *sfx9y x ozj9a(2pu2eud 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 sca4fx;h l)viq.v/j.jehk+k-y h les. Which stqilk kxh;vh-+./4fv )y.hejj atement 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 b7cf6 ,m3kntah alanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the36f,mc7htn k a 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 small end is inu iol ,5acpssu3- :l5j

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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 hor-hhrt:q 7*kx 1hy0 qbfizontal 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 dimensionw yp k)o wuy0;/o1g*its 20.0 cm x 10.0 cm x 6.0 cm. 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 the top brick can ex0/wto1okyw;u p*yg i)tend 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 -)7mh -sgzaniztte .m59lhd)apart on the edge. Wizs mal g)z7d-n.th te- 9)5hmhat minimum mass, placed in the middle 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 wires made of aluminum, brass, coppe*2mqtkhm zp.hhk3 5gtb2 m3j2r, and steel. Which 5k *2.jpt 3mmb 2kthqmz3 2hghwire 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 d l* xj (1)azc:nzqh1tsubjected 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 tenlxj:(d1t)c1zz ah * qnsion 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 buttrebl,l e3j03ym xssing force at the base of a pointed arch isxe 0ylb3jl,m3

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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 dis. a:ee huj* xi3ep,rb.ej( 5bqtance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposi(erbb.jpa5 eui. qj: h,ee*x3te 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. Tiar 3;sb8x9ihhe distance from the fulcrum to the weight to be lifted is 1.0a;sr39xbih i8 m. If a 3000 N 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 9uc-t+;pew b 4ge8ju ,lgosx8(h d: cfa massless seesaw. The boy 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 one side of the x:u bge8 gd ;(pfwl8o4he,c+sju9tc- 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 wh;: w2q0h )fkylfa wf-vich pivots in the center. Child A 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 f0) k:-yqfv2f hafw; lwor 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 weighinzs w50* :xr7e, dis+p53btbtxs 7qrxa g 500 N and 350 N, respecttd*5ib s r ,w ezq7t7pxsr+:35xba s0xively. 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 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 supporct/z lcu)i, 4nted 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 lefin4/c t), zluct 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 weigzltr uh 2tj5hrh*;:4dht 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 beam, what is the tension in the right ropehhl2th zj4: 5tdr ;ru*?

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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 scaffobjbge.o9: l; gld is 12 m long. A 300-N box sits 4.0g9ob;blj. ge : 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 each end. The sca/u ya(z:bt4 lgffold is 18 m long. A 650-N box sit gbal:z 4(/uyts
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 mark and has:617 m((f p uxm)avhg8tgxu ys masses oft1x(6mugxvmgpa(:hs 7 f u8)y 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 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 length 8.0 m. 5dato zfp,05abes/o 7 The board is supported at each end. If the suppoaoa,55t7p seo0 zb/fd rt 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 pphc/jz 0zd 3 96ms6snwlank 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 whms 39 zp66dw/n zj0cshich 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*lay*xd)alt4r i c o19xz5 t5t 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 horizontal. Al)4 d i **ca1taytx9olzxt5r5ssuming 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 9rs p*lixxfx8b xcbqg8): svs(;z;:pmass 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 xp;;r8)8(x::bsl9 zigf*b cs pvxxs qlower 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 cen- )5/zo+frd pit(evgjo :yzd4ter of gravity is equidistant from the sides, and position z-g yod /ojz5vid (4tp)fre:+ed 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 diameter. The top ,ke1+*cvnw ad9)p2eoos 9rlkis 4.5 m off center. How much farthe*odnvckp), s9e+a2l1kew9o rr 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 b34g .d-obrila a)eh)te needed bgt-)e.43 raaoli d )hto compress the 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 has a cross-sectionalbuh 5*(chm 00j jbe(ji 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 statio6o)o+, vco z 8knp8xfgn is 4.0 m long and 0.20 m in diameter. Young's modup68xf +,kcn)zgoo8 volus 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 stretchep .hfvm p ;xvpn:,5hq9s by 0.20% when a 6.28-N force is applied. What is the elastic modulus of thepnp,9m h:h.fvpq x v5; 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 length 11kps(ezd8+rg ) 3j0 gfa.2 m. How much will the wire stretch83gsfkpg)ajze r0+d(? 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 supports all hib/ck-5 v;wkp is weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted kp; 5-vwic/kb 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 are:ixq21e 8pcvkc0rs* z a 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 diameti-mrwz7yb qcuj/ ;7t;er supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for azywr- 7 /;7;tuij cmqbluminum 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 )zmdxip mr4:4xus q(1a 10.0-kg mass. What is the i4 1srq xxz4d(mu)pm: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 ebn l**:,o)/tnx nd qpapplied to one face of an aluminum cube with sides of 30 cm. What is tb*nq)/ xodte, pn:*ln he resulting 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 incre 4u-(jp 7n9*vyqv1dndv lznj 7ased by 100 atmospheres (to aboutq4n*z 1vny77pjnu(d- vj v9ld $10^7 \; N/m^2$). 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 ste (( ;qetgo/5f tysit+w0zc)if:1mrof el isi/ts:r 5g (c mf ftztifw 0+(oey1qo;) $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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