A block of aluminum is heated electrically by a 30w heater if the temperature rises by 10°c in 5 minutes; the heat capacity of the aluminum is?

A. 900 JK−¹
B. 90 JK−¹
C. 100 JK−¹
D. 200 JK−¹

Correct Answer:

Option A – 900 JK−¹

Explanation

Heat supplied = Heat gained Pt = MCDθ
30 x 5 x 60 = c x 10
where c = mc which is the heat capacity
c = (30 x 5 x60)/10 = 900 JKg−¹