Name the star that appears to be stationary in the night sky.

In a stationary wave

A satellite which appears to be stationary at a given spot above the equator is called a ___________satellite

When an observer is standing on earth, the trees and houses appear stationary to him . However , when he is sitting in a moving train, all these objects appear to move in backward direction. Why ?

Suppose that f is a polynomial of degree 3 and that f^(x)!=0 at any of the stationary point. Then f 1)has exactly one stationary point f 2)must have no stationary point f 3)must have exactly two stationary points f has 4)either zero or two stationary points.

Stars appear to twinkle . Give reason.

Stele with star shaped xylem is