Find an expression for the kinetic energy of a satellite of mass m in an orbit of radius r about a planet of mass m .

Explanation:

The gravitational force on the satellite provides the centripetal force that keeps the satellite in circular orbit around the satellite, so we can write

(1)

where

G is the gravitational constant

M is the mass of the planet

m is the mass of the satellite

r is the radius of the orbit

v is the speed of the satellite

The formula for the kinetic energy of the satellite is

which can also be written as

So we can substitute the expression that appears in (1) with 2K, and we find:

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

when it gains or loses electrons