Prob. 5: How many grains are there on the surface of the head of a pin? Assume that the head of a pin is semi-spherical with a 1-mm diameter and has an ASTM grain size of 12.
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The surface area of a sphere is given by the formula A = 4πr^2, where r is the radius of the sphere. In this case, the radius is half the diameter, so r = 0.5 mm. A = 4π(0.5 mm)^2 A = 4π(0.25 mm^2) A = 1 mm^2π Show more…
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