Asmall sphere is hung by a string from the ceiling of a van. when the van is stationary, the sphere hangs vertically. however, when the van accelerates, the sphere swings backward so that the string makes an angle of θ with respect to the vertical. find the acceleration of the van when θ = 12.8°.

Explanation:

As the small sphere is suspended by the string then the force due to tension is given as

now we will have

here we will have

here we know that

so we will have

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.