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.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.