# Class 9 Physics Chapter 8 Numericals Notes 2024

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## Class 9 Physics Chapter 8 Numericals Problem Notes

• The temperature of water in a beaker is 50°C. What is its value on the Fahrenheit scale?
• Normal human body temperature is 98.6°F. Convert it into Celsius scale and Kelvin scale.
• Calculate the increase in the length of an aluminum bar 2 m long when heated from 0°C to 20°C. If the thermal coefficient of linear expansion of aluminum is 2.5×10 K.
• A balloon contains 1.2 m of air at 15 °C. Find its volume at 40 °C. The thermal coefficient of volume expansion of air is 3.67×10 K
• How much heat is required to increase the temperature of 0.5 kg of water from 10 °C to 65 °C?
• An electric heater supplies heat at the rate of 1000 joule per second. How much time is required to raise the temperature of 200 g of water from 20 °C to 90 °C?
• How much ice will melt by 50000 J of heat? Latent heat of fusion of ice = 336000 J kg.
• Find the quantity of heat needed to melt 100g of ice at -10 °C into water at 10 °C.
• How much heat is required to change 100 g of water at 100°C into steam? (Latent heat of vaporization of water is 2.26×10 Jkg.
• Find the temperature of water after passing 5 g of steam at 100 °C through 500 g of water at 10 °C.