A small block of weight W is placed on a plane inclined at an angle 0 to the horizontal The coefficient of friction between the block and the plane is µ When e is 20° the block is in limiting equilibrium. Find H i) ii) When u = 1/3 and is 30° a horizontal force of 6N is required to prevent the block from slipping down the plane. What is the weight of this block? A force of 10N up the pane causes the bock to be on the point of sliding up If W = 20N and µ is ¼, find 0 If e is 40° and u is 0.5 find the magnitude and direction of the least force iii) iv) required to prevent the block from sliding down the plane when W = 12N

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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.