A_c

A 3-kg metal block is heated to 100℃ and then put into a 5-kg water bath.
The temperature of the water bath rises from 27℃ to 31.+7℃. What is the specific heat capacity of the metal block?
(specifi heat capacity of water=4200Jkg-* ℃-*)
紅字為唔明

if 2kg of water at 80℃ is mixed with 5kg of water at 30℃, what is the final temperature of the 'mixture'?
(specifi heat capacity of water=4200Jkg-* ℃-*)

2x4200x(80-T) =5X4200X(T-30)
=ANS.

The same amount of energy is transferred to an equal mass of water and copper.
which has a higher temperature rise, water or copper?
(the specifi heat capacities of water and copper are 4200Jkg-* ℃-* and 370 Jkg-* ℃-* respectively.)
知定義冇理由唔識




john is using a 200-W electric heater to heat 0.5kg of soup(Fig.c).What is the temperature of the soup after 5minutes if its initial temperature of is 20℃>
Assume all the energy given out by the electric heater is absorbed by the soup.
(specifi heat capacity of water=4200Jkg-* ℃-*)


p=e/t
p=q/t

200x5x60= m c /\t
好似應該係咁

[ 本帖最後由 A_c 於 2011-11-15 20:55 編輯 ]

A_c

ＰＨＹ呢啲英文好易姐，
我英文都係年年岩岩好合格多啲啲。

[ 本帖最後由 A_c 於 2011-11-15 21:00 編輯 ]

A_c

引用:

原帖由 ★瘋狂丶 於 2011-11-15 21:00 發表
英文我都唔知可以點補救  
sad

好似應該由小學書睇番上去，
ｏｒ去圖書館借ｄ英文書睇。