Who was the first person to realize that the planets move in elliptical paths around the Sun?
Copernicus.
Brahe.
Kepler.
Einstein.
An Earth satellite of mass m revolves at a height from the surface of the Earth. If R is the Earth's radius and g is the acceleration due to gravity at the surface of the Earth, then the velocity of the satellite is given by:
2gR²/ R+hD.
gR / R+h.
√ (gR / R+h).
√ [gR²/ (R+h)].
