Question 711256: A lighthouse has dual beams (two light sources opposite each other.) Ships at sea observe a blinking light every 5 seconds. what is the rotational speed to do this?
Thanks,
paulaficarella@gmail.com
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! If it has 2 beams in opposite directions that show up every 5 seconds, then one beam of light will take 2*5 = 10 seconds to go around completely.
Think of the lighthouse light having 2 different colors: red and blue. If you first see the red light, and time how long it will take until you see it again, it will take 10 seconds.
It can rotate 360 degrees in 10 seconds, so the rotational speed is 360/10 = 36 degrees per second.
If you must do it in radians, then there are 2pi radians in a circle. So the rotational speed is 2pi/10 = pi/5 radians per second.
|
|
|
