How much bituminous coal must be burned to release 270 MJ of heat?

Initial data: Q (the amount of heat that should be released during the combustion of coal) = 270 MJ = 270 * 10 ^ 6 J.

Constants: q (specific heat of combustion of coal) = 27 MJ / kg = 27 * 10 ^ 6 J / kg.

The amount of coal that needs to be burned is determined from the formula: Q = q * m, whence m = Q / q.

Calculation: m = 270 * 10 ^ 6 / (27 * 10 ^ 6) = 270/27 = 10 kg.

Answer: We need to burn 10 kilograms of coal.



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