𝑬𝒑𝒈 = 𝑸 ; 𝑬𝒑𝒈 = 𝒎. 𝒈. 𝒉 𝑸 = 𝑴. 𝒄. ∆𝑻 e

𝒎. 𝒈. 𝒉 = 𝑴. 𝒄. ∆𝑻

∆𝑻 =𝒎

𝑴

𝒈𝒉

𝒄

L

dA

dB

L

L

dA

L

dB

TQ TF

∆𝑸𝑨

∆𝒕= 𝒌𝑨

𝑨𝑨. ∆𝑻

𝑳𝑨

∆𝑸𝑩

∆𝒕= 𝒌𝑩

𝑨𝑩. ∆𝑻

𝑳𝑩

∆𝑸𝑨

∆𝒕=

∆𝑸𝑩

∆𝒕

𝒌𝑨

𝑨𝑨. ∆𝑻

𝑳𝑨= 𝒌𝑩

𝑨𝑩. ∆𝑻

𝑳𝑩 ;

𝑨𝑨 = 𝝅. 𝒓𝑨𝟐 = 𝝅.

𝒅𝑨

𝟐

𝟐

𝑨𝑩 = 𝝅. 𝒓𝑩𝟐 = 𝝅.

𝒅𝑩

𝟐

𝟐

𝒌𝑨. 𝝅.𝒅𝑨

𝟐

𝟐

= 𝒌𝑩. 𝝅.𝒅𝑩

𝟐

𝟐

𝒌𝑨.𝟒𝒅𝑩

𝟐

𝟒= 𝒌𝑩.

𝒅𝑩𝟐

𝟒

𝒌𝑨 =𝒌𝑩

𝟒

∆𝑸

∆𝒕= 𝒌

𝑨. ∆𝑻

𝑳

∆𝑸 = 𝒌𝑨. ∆𝑻. ∆𝒕

𝑳 ; ∆𝑸 = 𝒎𝑯𝟐𝑶. 𝑳𝒇

𝒎𝑯𝟐𝑶. 𝑳𝒇 = 𝒌.𝑨. ∆𝑻. ∆𝒕

𝑳

𝒎𝑯𝟐𝑶 = 𝒌.𝑨. ∆𝑻. ∆𝒕

𝑳. 𝑳𝒇

𝒎𝑯𝟐𝑶 = 𝟎, 𝟎𝟏.𝟎, 𝟖𝟎. 𝟑𝟎. 𝟖, 𝟔𝟒. 𝟏𝟎𝟔

𝟐. 𝟏𝟎−𝟐. 𝟑, 𝟐. 𝟏𝟎𝟓

𝒎𝑯𝟐𝑶 = 𝟑, 𝟐𝟒 𝒌𝒈

𝑸 = 𝒎𝑯𝟐𝑶. 𝑪𝑯𝟐𝑶. ∆𝑻𝑯𝟐𝑶

𝑸 = 𝟏𝟎𝟎𝒈.𝟏 𝒄𝒂𝒍

𝒈℃. 𝟖𝟎 ℃

𝑸 = 𝟖𝟎𝟎𝟎 𝒄𝒂𝒍 ou

𝑸 = 𝟑𝟑𝟔𝟎𝟎 𝑱

𝑷 =𝑬

∆𝒕 ; 𝑬 = 𝑸

𝑷 =𝑸

∆𝒕

∆𝒕 =𝑸

𝑷

∆𝒕 =𝟑𝟑𝟔𝟎𝟎 𝑱

𝟐𝟎𝟎 𝑾

∆𝒕 = 𝟏𝟔𝟖 𝒔