Qi. If the total supplied energy to the fan is 250 J and 200 J is usefully transferred to the kinetic
store, how much is wasted by heating?

Could someone help ?

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex