A melting ice block of mass 0.05kg is mixed with xkg of water at 0C in a well insulated container. If 25000J of energy is supplied to the mixture, the mixture change to water at 4C. Find the value of x. (2001-16)
A. 0.37 B. 0.44 C. 0.49 D. 1.44 E. 1.49
& explain , Thanks !
我覺得條問題問得有d唔清楚,令人混淆
Physics Question(MC) = Heat, please help
2006-11-06 1:17 am
回答 (1)
2006-11-06 1:25 am
✔ 最佳答案
A melting ice block of mass 0.05kg is mixed with xkg of water at 0C in a well insulated container. If 25000J of energy is supplied to the mixture, the mixture change to water at 4C. Find the value of x. A. 0.37 B. 0.44 C. 0.49 D. 1.44 E. 1.49
冰放出的熱為
m1L + m1cΔT = 0.05*334000 + 0.05*4200*4
水放出的熱為
m2cΔT = x* 4200* 4
E = 0.05*334000 + 0.05*4200*4 + x* 4200* 4
25000 = 16700 + 840 + 16800x
x = 0.44kg (答案為 B)
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