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An hourglass with a valve that starts th...

An hourglass with a valve that starts the flow of sand is being weighed on a sensitive balance. Compare the momentum of the sand before the valve is turned when sand is being dropped in a steady stream from the upper to the lower falf, and when all the sand is in the bottom. What are the scale readings at these three times. does the scale read differently when the momentum of the sand is changing?

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