An object of about 10 kg is measured by a not-so-ideal balance. The pivot is provided by a 4.0mm wide ribbon, so the uncertainty of the position of the pivot is 4 mm. All distances on the scale are measured from the midpoint of the ribbon. Estimate the percentage error if the weight of the object is measured using this balance

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an electric circuit

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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answer: 31, 5556. 952 seconds