4 seconds after being launched , what is the height of a ball that starts from a height of 12 meters with an initial upward velocity of 24 m/ s

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

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?