A ball of thermal capacity 10 cal/°C is heated to the temperature of furnance. It is then transferred into a vessel containing water…

Q: A ball of thermal capacity 10 cal/°C is heated to the temperature of furnance. It is then transferred into a vessel containing water. The water equivalent of vessel and the contents is 200g. The temperature of the vessel and its contents rises from 10°C to 40°C. What is the temperature of furnance ?

(a) 640°C

(b) 64°C

(c) 600°C

(d) 100°C

Ans: (a)