Astronauts leaving the Moon must reach its escape speed. Using the Moon's mass, $7.35 \times 10^{22}\ \text{kg}$, and radius, $1.74 \times 10^{6}\ \text{m}$, find that speed. ($G = 6.67 \times 10^{-11}\ \text{N m}^2/\text{kg}^2$.)