A uniform ladder of weight W and length 2a rests in limiting equilibrium with one horizontal ground and the other end on a rough vertical wall. The coefficients of friction between the ladder and theground and between the ladder and the wall are u and d respectively. If the ladder makees an angle 0 with the grðund, where tan 0 = 12 (a) show that 5u + 62µ – 6 = 0, (b) find the values of u and 2, given that Au

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.