centripetal acceleration is given by formula

given that


now we have




so the ratationa frequency is given by




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Answer: friction reduces the speed during motion
Explanation:
The more the friction, the lesser the speed during motion
The motion of the light is a uniform motion with constant speed

, therefore we can use the basic relationship between speed, space and time:

(1)
where S is the distance covered and t is the time taken. The light takes t=1.3 s to travel from the moon to Earth, therefore by rearranging eq.(1) we can find the distance between the Moon and the Earth: