In an oscillating l c circuit, the maximum charge on the capacitor is 1.5 × 10 − 6 c and the maximum current through the inductor is 5.5 ma.
(a) what is the period of the oscillations?
(b) how much time elapses between an instant when the capacitor is uncharged and the next instant when it is fully charged?
-- from january 15 to february 6 is a period of 22 days.
-- the period of the full cycle of moon phases is 29.53 days.
-- so those dates represent (22/29.53) = 74.5% of a full cycle of phases.
-- that's almost exactly 3/4 of a full cycle, so on february 6, the moon would be almost exactly at third quarter. that's the left half of a disk (viewed from the northern hemisphere).