A piano string turned to middle C vibrated with a frequency of 250 Hz. Assuming the speed of sound in air is 350 m/s, find the wavelength of the sound waves produced by the string. (Sample Problem D on Chapter 11 Section 3)

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.