if a rubber stopper of mass 13 g is rotated in a horizontal circle path of radius 0.93 m to make 50 complete revolutions in interval of 59s. find the mass of the load attached to the other end of the string.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

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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t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.