A force 10N causes a spring to extend by 20mm. Find: A) the spring constant of the spring in N/M.
B) the extension of the spring when 25N is applied .
C) the force applied that causes an extension of 5mm.

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.