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Thermal Properties of Matter (Class 11 — ~20% weight)

Thermal expansion, calorimetry, heat transfer, Newton's law of cooling.

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Q1 · Thermal Properties of Matter (Class 11 — ~20% weight) · EASY
A steel rod of length 5 m at 20°C is heated to 120°C. If the coefficient of linear expansion of steel is 1.2 × 10⁻⁵ per °C, find the increase in length of the rod.
Q2 · Thermal Properties of Matter (Class 11 — ~20% weight) · MEDIUM
500 g of water at 30°C is mixed with 200 g of water at 60°C. Assuming no heat loss to surroundings, what is the final temperature of the mixture? (Specific heat capacity of water = 4200 J/kg°C)
Q3 · Thermal Properties of Matter (Class 11 — ~20% weight) · HARD
A body cools from 80°C to 60°C in 5 minutes and to 50°C in the next 5 minutes. What is the temperature of the surroundings? (Assume Newton's law of cooling is valid)
Q4 · Thermal Properties of Matter (Class 11 — ~20% weight) · HARD
A metallic rod of length 1 m has its one end at 100°C and the other end at 0°C. The temperature at a point 40 cm from the hot end in steady state is: