A water-wheel has eight buckets equally spaced around its circumference as shown in the figure below. water empty bucket- full bucket 45° direction of rotation 1.6 m 9. water The distance between the centre of each bucket and the centre of the wheel is 1.6m. When a bucket is at its highest point, the bucket is filled with a mass of 40kg of water. The wheel rotates and the bucket is emptied at its lowest point. The wheel makes six revolutions per minute. (a) Calculate the total change in potential energy of the water in the buckets in one revolution of the wheel. (b) Calculate the average input power to the wheel. (c) Suggest why a larger number of small buckets is preferred to a smaller number of large buckets containing the same mass of water.

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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.