Earth makes one rotation in 24 hours. What's its angular velocity?
(a) $1.16 \times 10^{-5} \mathrm{rad} / \mathrm{s}$
(b) $0.042 \mathrm{rad} / \mathrm{s}$
(c) $1.39 \times 10^{-5} \mathrm{rad} / \mathrm{s}$
(d) $7.27 \times 10^{-5} \mathrm{rad} / \mathrm{s}$.