Discover Questions

Are the motion of galaxies relative to the same radius to the gravity center of mass of the Physical Universe with same frequency? Show that the expression (x+y)(x-y)-16x+64 may be written as the difference of two squares, and then factor the expression.? Why is a test charge always very small? A nail put into tree at height of 2m from ground.This tree grows at rate of 0.5m a year. How high above ground will nail be after 20 years.? How do Elephant Seals interact towards humans?