中4 熱學數!
回答 (1)
2007-11-20 6:40 am
✔ 最佳答案
C的功率 = 3p, D的功率 = 4p根據:
E = Pt
E = mc△T
鐡塊A:
3pt = mc4T
m = 3pt / 4ct
鐡塊B:
4pt = m'c3T
m' = 4pt / 3cT
m : m' = 3pt / 4ct : 4pt / 3ct
= 9 : 16
所以A和B質量的比率 = 9 : 16
2007-11-19 22:42:30 補充：
更正: 1)鐡塊A:3pt = mc4Tm = 3pt / 4cT2)m : m' = 3pt / 4cT : 4pt / 3cT= 9 : 16
參考: My Phy Knowledge
收錄日期: 2021-04-26 14:10:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071119000051KK04211