An hourglass is turned over, and the sand is allowed to pour from the upper half

Question

An hourglass is turned over, and the sand is allowed to pour from the upper half of the glass to the lower half.

If the hourglass is resting on a scale, and the total mass of the hourglass and sand is , describe the reading on the scale as the sand runs to the bottom.

A. The weight read by the scale is greater than Mg when the sand begins falling, but is less than Mg when most of the sand has fallen.

B. The weight read by the scale is less than Mg when the sand begins falling, but is greater than Mg when most of the sand has fallen.

C. The weight read by the scale is equal to Mg.

D. The weight read by the scale is equal to Mg.

E. The weight read by the scale is greater than Mg.

Explanation / Answer

when sand falls then it would be in a condition of weightlessness therefore the
weight must be less than Mg.And it will be more than Mg when most of the sand has fallen.
hence the correct option should be B.

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