The plant burns anthracite coal, which has a heat of combustion of 2. 65×107j/kg. How much coal does the plant use per day, if it operates continuously?.

Which of these metals are magnetic?

Convection currents are caused by differences in what two things?

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? a b c d