A drop of water has a mass of about 0.050 g. a) What is its equivalence in pure energy, at rest? b) What would be the mass of the drop of water if it had a speed of 0.90c? c) Compare your answer to part a) with the estimated energy released by the atomic bomb dropped on the city of Hiroshima on August 6, 1945 (do a short research).

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.