Two identical objects a and b fall from rest from different heights to the ground. if object b takes twice as long as a to reach the ground, what is the ratio of the heights (a: b) from which the two objects fell? neglect air resistance.

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i. e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.