9 chapter - Numericals || 9th class physics || Transfer of heat problems || matric numericals
This video is related to 9th class chapter 9 Numericals ( Transfer of heat ). ( Punjab textbook) @fanticer
0:06 9.1 The concrete roof of a house of
thicknes 20 cm has an area 200cm².
The tempereture inside the house is
15°C and outside is 35°C. Find the rate
at which thermal energy will be
conducted through the roof. The value
of k for concrete is 0.65 Wm-¹K-¹.
(13000Js-¹)
4:17 9.2 How much heat is lost in an hour
through a glass window 🪟 measuring
2.0 m by 2.5 m when inside temperature
is 25°C and that of outside is 5°C, the
thickness of glass is 0.8 cm and the
value of k for glass is 0.8 Wm-¹K-¹?
(3.6 × 10⁷ J)