An insulated thermos contains of 200 cm3 of hot water at 90°C . A cube of copper at 10°C with density 8.9 g/cm3 is dropped into the water and reaches thermal equilibrium eventually. The mass of the copper is 100 g. The specific heat, and coefficient of linear expansion of copper are 0.39 Jg^-1°C^-1? and 17 × 10-6 C-1, respectively. The density and specific heat of water are 1.00 g/cm3 and 4.18 Jg^-1°C^-1 , respectively. (a) Determine the temperature of the copper after thermal equilibrium. (b) Calculate the heat absorbed by the copper. (c) Estimate the volume changed of the copper. (d) Estimate the density changed of the copper. Is the density increasing or decreasing compared to the density at 10°?? (e) Explain briefly how a thermos keeps your water warm.

An insulated thermos contains of 200 cm3 of hot water at 90°C . A cube of copper at 10°C with density 8.9 g/cm3 is dropped into the water and reaches thermal equilibrium eventually. The mass of the copper is 100 g. The specific heat, and coefficient of linear expansion of copper are 0.39 Jg^-1°C^-1? and 17 × 10-6 C-1, respectively. The density and specific heat of water are 1.00 g/cm3 and 4.18 Jg^-1°C^-1 , respectively. (a) Determine the temperature of the copper after thermal equilibrium. (b) Calculate the heat absorbed by the copper. (c) Estimate the volume changed of the copper. (d) Estimate the density changed of the copper. Is the density increasing or decreasing compared to the density at 10°?? (e) Explain briefly how a thermos keeps your water warm.

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