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
F3 physics question in book
2007-04-26 5:57 am
回答 (1)
2007-04-26 7:46 am
✔ 最佳答案
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.
收錄日期: 2021-04-12 22:27:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070425000051KK04615