A bob of mass 0.20 kg is attached to a light string and moves at a constant speed in a horizontal circle of radius 0.60 m as shown. The string makes an angle of 35° with the vertical. 35 0.60 m (a) Show that the tension in the string is 2.4 N.

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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.