Find the maximum period a purse could have so that when you spin it in a vertical circle the straps would remain taut. Make reasonable estimates for any values you might need. (mass- 1kg)
(r-0.25)
or anything basically

568.98

explanation:

its math

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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