6/51 A block of mass m, is placed between the vertical wall and the upper end A of the uniform slender bar of mass m. If the coefficient of static friction is µ, between the block and the wall and also between the block and the bar, determine a general expression for the minimum value 8min of the angle 0 for which the block will remain in equilibrium. Evaluate your ex- pression for the conditions µ, = 0.50 and (a) m 0.1, (b) mo 1, and m (c) 10. For each case, state the minimum coefficient of sta- tic friction (µ,)g necessary to prevent slippage at B.

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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.