4 ms·
At one lightyear distance from the lighthouse, the angular velocity of the beam is 2Pi lightyears per minute* Actually, that's the linear velocity. The angular
by teaspoon 15y ago
At one lightyear distance from the lighthouse, the angular velocity of the beam is 2Pi lightyears per minute*
Actually, that's the linear velocity. The angular velocity would be 2*pi radians per minute and is independent of distance.