Two blocks of masses 20 kg and 8.0 kg are connected togetherby
a light string and rest on a frictionless level surface. attached to
the 8-kg mass is a second light string, which a personuses to pull
both blocks horizontally. if the two blocks systemacdereates at 0.5
m/s2, what is the tension in the second stringattached to the 8-kg
mass?

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?