Aclimber using bottled oxygen accidentally drops the oxygen bottle from an altitude of 4500 m. if the bottle fell straight down this entire distance, what is the velocity of the 3-kg bottle just prior to impact at sea level? (note: ignore air resistance)

300 m/s

Explanation:

As the cylinder drops off so its initial velocity is zero.

h = 4500 m, g = 10 m/s^2, u = 0

Use third equation of motion

v^2 = u^2 + 2 g h

v^2 = 0 + 2 x 10 x 4500

v^2 = 90000

v = 300 m /s

frequency or wavelenth of em radiation in a vacuum

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.