I.S. question

2007-10-20 3:43 am

Take two glasses of water at room temperature. Heat one glass of water up to let's say 80 degrees Celsius. Put both glasses in the freezer. Which glass of water will be frozen first (supposing the glass will not break of course)?

A.The cold water
B.The hot water
C.Both glasses at the same time
D.The cold water, but the hot water will take ages to freeze

回答 (4)

tetrachloromethane

2007-10-20 3:59 am

✔ 最佳答案

A
more energy is needed for the hot water to cool to 0 degrees
energy= mass x s.h.c x temp change
same mass,s.h.c(same substance), higher temp chnge, higher the energy
power =energy/time
power is the same because they are put in same freezer
so the higher the energy the longer the time for it to freeze
(you will learn these heat equations in f3 physics)
s.h.c=specific heat capacity

it could be D
it depends on how long you mean by "ages"

2007-10-20 15:26:37 補充：
The question only ask for which glass of water will freeze FIRSTThe answer should be Abecause it is not necessay to mention the glass of hot water

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