speech of sound is 343 m/s in 20° air. you are 415m from a sound source. how long does it take the sound to reach you?

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.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?