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Thermal Physics

Blazing goIITian

 Joined: 8 Sep 2011 Post: 437
29 Mar 2012 15:15:33 IST
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heat
Engineering Entrance , Medical Entrance , NEET , JEE Main , AIIMS , JEE Main & Advanced , Physics , Thermal Physics

A cuboid ABCDEFGH is anisotropic with

ax = 1×10-5 /°C, ay= 2 × 10-5 /°C, az = 3 × 10-5/°C. Coefficient of superficial expansion of faces can be

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
29 Mar 2012 15:39:01 IST
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three cefficients are there 1.ax +ay2.ay + az3.az + ax

Blazing goIITian

Joined: 8 Sep 2011
Posts: 437
29 Mar 2012 15:54:48 IST
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(A)bABCD = 5 × 10-5 /°C (B) bBCGH = 4 × 10-5 /°C

(C) bCDEH = 3 × 10-5 /°C (D) bEFGH = 2 × 10-5 /°C

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
29 Mar 2012 16:00:33 IST
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option c

Blazing goIITian

Joined: 8 Sep 2011
Posts: 437
29 Mar 2012 18:49:28 IST
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hey pooja c is the ans how did you get it?

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
29 Mar 2012 18:54:57 IST
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Yar koi in chapter ko smja do kuki ye chapter m m bilku duffor hu>>sound wave,elasticity and expansion pls pls

Blazing goIITian

Joined: 8 Sep 2011
Posts: 437
30 Mar 2012 12:42:22 IST
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anyone?

Cool goIITian

Joined: 19 Mar 2011
Posts: 74
30 Mar 2012 12:46:12 IST
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B and D..

Blazing goIITian

Joined: 8 Sep 2011
Posts: 437
30 Mar 2012 12:52:42 IST
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hey c is the ans.. tell me your approach..

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
30 Mar 2012 13:56:04 IST
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hey same method for anisotreopic solid coe. of areal or superficial expansion through one face=sum of linear expansion of its dimension ............now for cdeh dimension are x and y component since z is constant for it so superficial expansion through it will be ax+ay=3*10^-5 c^-1

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
30 Mar 2012 13:57:13 IST
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how many i am waiting 4 days i got the answer and tell them method but they dont like my post lets see whwt u do

Cool goIITian

Joined: 19 Mar 2011
Posts: 74
30 Mar 2012 14:04:22 IST
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take a rectangle a by b.

for change in temp del T,the linear expansions be p and q along a and b..

A=ab.. change in area be del A

try to draw a picture yourself..its more convenient

del A= aq+bp+pq (ap=del a,bq=del b)

so del A=ab(p+q).del T   pq is neglected as it is negligible..

del A/ A(del T)= p+q which is the coefficient of superficial expansion..

here p=10^-5,q=2*10^-5

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