An ice skater with a weight of 450N is skating at a speed of V=6m/s. Assume the length of the skate blade is L=0.3 m and the width of the blade is W=0.003 m. Suppose the thic kness of the water formed by melting ice by the blade of the skate is h=0.0015mm . The viscosity of water is µ=1.76×10-³(N•s/m²). uy V = 6 m/s 1. Find friction by the skate blade. 2. Find the speed of the skater. h L

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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.