Two bodies A and B are connected by a string over a pulley and a disc slides over the string (see the figure). Then (B+D) cannot be treated as a system. The reason is[ ]
a) The distance covered by B and D are equal
b) The distance covered by B and D are not equal
c) The directions of B and D are same
d) The directions of B and D are not same

it becomes positively charged by charging it

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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