"4 An electric heater is placed in an insulated container holding 100g of ice at a temperature of -14 degrees C. The heater supplies energy at a rate of 98 joules per second.
4(a) After an interval of 30s, all the ice has reached a temperature of 0 degrees C.Calculate the specific heat capacity of ice."
2100 J per kg per K (from E=mc delta T)"
4(b) Show that the final temperature of the water formed when the heater is left on for a further 500s is about 40 degrees C.
specific heat capacity of water = 4200 J per kg per K
specific latent heat of fusion of water - 3.3 x 10^5 J per kg"
Calculate energy/time to melt ice, then calculate the further change in temperature from the remaining energy/time.
"4(c) The whole procedure is repeated in an uninsulated container in a room at a temperature of 25 degrees C. State and explain whether the final temperature of the water formed would be higher or low that than calculated in part (b)."
Can anyone explain why the answer to 4c) is higher