# Class 9 Physics Chapter 9 Transfer of Heat Numericals 2024

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## Class 9 Physics Chapter 9 Transfer of Heat Numericals

• The concrete roof of a house of thickness 20 cm has an area of 200 m. The temperature 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 K.
• How much heat is lost in an hour through a glass window measuring 2.0 m by 2.5 m when the inside temperature is 25 °C and that of the outside is 5°C, the thickness of glass is 0.8 cm and the value of k for glass is 0.8Wm K?