First slide

Gravitational potential and potential energy

Question

An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E₀. Its potential energy is

Moderate

A

$- E_{0}$
B

$1 .5 E_{0}$
C

$2 E_{0}$
D

$E_{0}$

Solution

Potential energy = 2 × (Total energy) = 2E₀
Because we know = $U = \frac{- GMm}{r}$ and $E_{0} = \frac{- GMm}{2 r}$

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