Do you like farts? Because my farts smell like flowers

What is the increase in density of a medium due to wave travel?

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?