Acoil visbreaker operates at 500°c for 1 min. how long will it take to achieve the same thermal severity at 450°c in a soaker visbreaking process? an apparent arrhenius activation energy for thermal cracking is given as 50 kcal/mol. show each step of calculations in your answer.

A10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. which one has the greater buoyant force on it? explain. b - the aluminum a) both have the same buoyant force. b) the aluminum c) the lead d) it cannot be determined without knowing their volumes.