Question

Сколька нужно зжеч кам. угля штоби вишло 135 мдж теплати? питома теплоты згарания кам. угля 2.7× 10сьомих дж на кг

Answer 1

Ну так раздели всю теплоту 135МДж на теплоту сгорания и получишь массу угля. Вроде как полкило получается.

Answer 2

Calculating the Amount of Coal Needed to Produce 135 MJ of Heat Energy

To calculate the amount of coal needed to produce 135 MJ of heat energy, we can use the specific heat of combustion of coal, which is given as 2.7 × 10^7 J/kg.

The formula to calculate the amount of coal needed is:

Amount of coal (in kg) = Heat energy required (in J) / Specific heat of combustion of coal (in J/kg)

Substituting the given values: Amount of coal (in kg) = 135,000,000 J / (2.7 × 10^7 J/kg)

Let's calculate this:

Amount of coal (in kg) = 135,000,000 J / (2.7 × 10^7 J/kg) = 5 kg

So, to produce 135 MJ of heat energy, approximately 5 kg of coal is needed.

I hope this helps! If you have any other questions, feel free to ask.