| Author |
Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 21 Jan 2008 11:34:38 IST
|
|
|
Q.
The ends of a coil of 40ohm resistance are connected to a voltmeter, reading 6V.the coil sis suspended in oil for 15 min and its temperature rises through 20 degree centigrade.find the mass of the oil, given its specific heat capacity = 0.2 kcal/kg/degree cent. the thermal capacity of the calorimeter may be neglected.
the answer given in my state board book is 38.6g.
|
it is not important where u stand, but in which direction u are moving |
|
|
|
21 Jan 2008 13:33:54 IST
|
|
|
The ans should be = 48.2 gm
|
this reply: 5 points
(with 1 
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
21 Jan 2008 14:06:28 IST
|
|
|
please post the complete soln. plzzz !
|
it is not important where u stand, but in which direction u are moving |
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
21 Jan 2008 14:15:16 IST
|
|
|
the ans wud be Heat= V^2t/R
(36 x 15 x 60)/40= 810 Joules= 0.192 cal
:.Let mass=m
C=0.2 kcal/kgC
:. m* C (sp. heat cap.)* 20K=0.192
4m=0.192
m= 0.048 kg= 48 g
sorry for the prev. mistake dint read the question proply
|
Goodbye Orkut
Hello GoIIT |
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
|
|
rate of transfer of heat = V^2/R = 36/40 = 9/10
total heat transfered = 9/10 x 15 x 60 = 810J = 810/4.18 cal
0.19377 = m x C x dT
m = 0.19377 / (20x0.2)
=0.048Kg = 48g
|
science-
the most fundamental
the most eternal
|
this reply: 5 points
(with 1
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
Moderation Team
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
