A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10oC. If a temperature rise of 30oC is obtained after 10min, the heat capacity of the material is
-
A.
6.0 x 104JoC-1 -
B.
4.0 x 104JoC-1 -
C.
1.2 x 104JoC-1 -
D.
8.0 x 104JoC-1
Correct Answer: Option A
Explanation
2000W heater → 2000J/S
=> Heat supplied by the heater within 10 min
(600 seconds) = 2000 x 600
= 1200000J
∴ Heat capacity MC = 1200000/(30-10)
= 60000J/C
Heat capacity = 6.0 x 104J/C