ATMS 120 Study Guide - Quiz Guide: Kilowatt Hour
4 May 2016
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Weekly challenge problem #9: hail and thunderstorm wind power. Hail (part #1): you must show all of your work! In 2003, the second largest hailstone on record fell in nebraska. The hailstone was perfectly spherical and had a circumference of 18 inches. The density of ice in a hailstone is 40. 2 lbs/ft3. The volume of a sphere is (4/3) r3. The fall velocity of a hailstone in still air can be approximated using this equation dkv where k = 20 if d (the diameter of the stone) is given in centimeters. V will have units of meters per second (m/s) as long as d is in cm. 1. circumference of hail = 18 in = 1. 5 ft. Radius = 1. 5 ft / 2pi = . 2387 ft. Vol. of sphere = (4/3pi*r^3) =(4/3pi*r^3) = . 05697 ft^3. Mass = 40. 2 lb/ft^3 * . 05697 ft^3 = 2. 29 lbs: diamater of hail = . 2387ft*2 = . 4774 ft = 14. 55 cm.
