What is a fuel? something that you rub to make heat
something that can be burned to produce heat
a kind of electricity
anything that makes heat
pl answer correctly

Determine the maximum r-value of the polar equation r =3+3 cos 0

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?

Why does lightning travel from clouds to the ground?