★瘋狂丶

注意:  *等於-1 (小寫1)
第一條: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-* ℃-*)


第二條:
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-* ℃-*)


第三條:
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.)


第四條:
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-* ℃-*)



麻煩你地希望可以詳細D  ><
因為月底都要測物理英文=.=`

[ 本帖最後由 ★瘋狂丶 於 2011-11-15 20:52 編輯 ]

★瘋狂丶

引用:

原帖由 ♥_靈魂S 於 2011-11-15 20:47 發表
=.= 英文中學? 嘩物理甘難仲要英文 真係幫吾到你=.=

唔系英文中學黎- -`
系挑戰題  

★瘋狂丶

引用:

原帖由 紅白藍 於 2011-11-15 20:50 發表
31.+7℃ = =咩黎
如果係31度
水獲得既熱能:4x4200x4=67200J
鐵失去既熱能:3X(100-31)Xc
兩者相等
c=324Jkg-1C-1

唔系31度= =
我打錯
系31.7度有無得詳細D

★瘋狂丶

引用:

原帖由 A_c 於 2011-11-15 20:54 發表
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 ...

英文我真系好差,
年年英文都唔合格  =.=

★瘋狂丶

引用:

原帖由 A_c 於 2011-11-15 20:57 發表
ＰＨＹ呢啲英文好易姐，
我美文都係年年岩岩好合格多啲啲。

英文我都唔知可以點補救  
sad

★瘋狂丶

引用:

原帖由 A_c 於 2011-11-15 21:01 發表


好似應該由小學書睇番上去，
ｏｒ去圖書館借ｄ英文書睇。

我都希望會做到呢樣野=.=`
我又唔想日日比屋企人見到我溫書個個樣=.=`
日日系度諗呢樣,諗個樣..