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If I weigh 90.7 kg at the beginning of the day, and if I consumed 9000...

If I weigh 90.7 kg at the beginning of the day, and if I consumed 9000 KJ of energy and 2.7 Liters of water in one day, what would be my overall mass at the end of the day? How would the units cancel in order to just have mass?

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Answer #1

Using Einstein's mass-energy relation, we have

Now, for water 1 liter = 1 kg, therefore, 2.7 liters = 2.7 kg

Thus, mass of the person at the end of the day would be

(eight zeros in between)

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