A 100 cm long cylindrical flask with inner and outer radius r1 = 2 cm and r2 = 4 cm respectively, is completely filled with ice at 0ºC as shown in the figure. The constant temperature outside (surrounding) the flask is 40ºC. Assume heat exchange occurs only through the curved surface of the flask. (Thermal conductivity of the flask is 0.693 W.mºC, Lice = 80 cal/gm and 1 cal = 4200 J).
(A) Rate of heat flow from surrounding to the flask is 80π J/s
(B) The rate at which ice melts is π/4200 kg/s
(C) The rate at which ice melts is 100π Kg/s.
(D) Rate of heat flow from surrounding to the flask is 40π J/s
