A 200W heater is inserted into a beaker of crushed ice of mass 0.5kg at 0C.
What is the shortest time to melt the ice completely ?
What assumption have you made in your calculation ?
thx
2007-04-25 17:57:24 · 1 個解答 · 發問者 ? 1 in 科學 ➔ 其他：科學
Energy needed to melt the ice
= mL
= 0.5 x 334000
= 167000 J
Shortest time
= E / P
= 167000 / 200
= 835 s
Assume that the heater does not lose heat to the surroundings, and the ice does not gain heat from the surroundings.
2007-04-25 19:46:00 · answer #1 · answered by Uncle Michael 7 · 0⤊ 0⤋