The atomic number of an atom is the number of
a. protons and
neutrons
b. neutrons
c. electrons and neutrons
d. protons

The metric unit of electrical power is the watt volt ampere ohm

In science and physics what is the standard unit of measure for speed?

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?