For a given right triangle, angle a=61 degrees and side b=39 ft. what is the length is side a ?

atomic = no of protons.

mass number-atomic number = neutron number

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.