Help me plz.
i need a good grade.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

Why does gravity have a lesser than grater effect on higher altitudes?

Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after 1 hour? when will the pool water be 0.006% chlorine?