A copper ball of mass 100 g is at temperature T. It is dropped into a copper calorimeter of mass 100 g containing 170 g of water at 30°C. The final equilibrium temperature is 75°C. Find T. Take specific heat of copper = 0.1 cal g⁻¹ °C⁻¹.
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Question

A copper ball of mass 100 g is at temperature T. It is dropped into a copper calorimeter of mass 100 g containing 170 g of water at 30°C. The final equilibrium temperature is 75°C. Find T. Take specific heat of copper = 0.1 cal g⁻¹ °C⁻¹.

Options

G1 Physics · Accepted Answer

Apply energy conservation. Sensible heat is Q=mcΔT and phase-change heat is Q=mL. Heat lost by hotter parts equals heat gained by colder parts. Evaluating the given data/statements gives 885°C. Therefore the correct answer is D.