How does applying oil to a bicycle the bicycle to work better?

Most energy in an ecosystem comes originally from_

What is magnetic flux? explain faraday's law of induction.

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."