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Thermal Physics

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8 Apr 2008 10:32:26 IST

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576

therms...cud u solve this??

None

An ideal gas has an initial pressure of 3 pressure units and an initial volume of 4 volume units. the table gives the final pressure and volume of the gas (in those same units) in five processes. Which processes start and end on the same isotherm?

^{a b c d e}

^{__|__________________________}

^{p | 12 6 5 4 1}

^{V | 1 2 7 3 12}

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SRM

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8 Apr 2008 10:40:34 IST

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come on guys....... PLEASE HELP OUT OVER HERE>>>

Raghav

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8 Apr 2008 10:42:29 IST

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is it a and e

SRM

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8 Apr 2008 10:49:53 IST

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no that is wrong... the answer is gien as all except c..... cud you show u worked this out???

arpan1

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8 Apr 2008 11:22:19 IST

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see this is a simple one

u just need to obey boyle law

(since it is given that temp. should remain const..)

so u just need to check that P₁V₁ = P₂V₂

clearly all others satisfy except (c)

hope u got it

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SRM

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8 Apr 2008 11:33:02 IST

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so when you say obey Boyl's law do you imply that....

P_aV_a = P_bV_b=.......

where P_a represents the diff in the int.and fin. pressures?? and similarly for V

arpan1

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8 Apr 2008 11:38:23 IST

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no they represent absolute pressure and volume

let me give an example from the ques

given p_a = 12 and v_a = 1

p_b = 2 and v_b = 2

so p_a . v_a = p_b. v_b = 12 = p_d.v_d = p_e. v_e is not equal to p_c.v_c

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Sahil Gupta

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8 Apr 2008 11:41:45 IST

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it is a,b,d,e. as in all these cases the temperatures are same as PV values are same.
P_aV_a = P_bV_b = P_dV_d = P_eV_e = 12

SRM

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8 Apr 2008 11:53:31 IST

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thank You...@arpan1 and @sahilgupta_iit.....
Cheers!!

Rakesh OFFLINE

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8 Apr 2008 13:40:53 IST

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sorry i am late correct ans are already given

SRM

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8 Apr 2008 14:19:47 IST

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Yes..... thanks a lot for everything.....!!! All the best....dudes!!
CHEERS!! :)

Glenn Jasper

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8 Apr 2008 22:28:29 IST

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hey, u asked fer help, n i c its all over...........!!!

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