A comet (Sphere of Ice)(Using weight of water
62.4 Lbs per cubic foot)
approaching the earth at a 60 degree angle... traveling at 30 miles per second...and losing weight at the rate of 1000 lbs per second per each 1 lb per square inch atmospheric pressure...Assume it starts losing weight when the atmospheric pressure is 1 lb per square inch at 56412 feet altitude.What size sphere will lose all it's weight by the time it hits the earth? Find the diameter of the sphere. Volume of a sphere = (4/3)*Pi*R*R*R where R = the Radius & Pi = 3.14159 At Sea Level Atm Pressure = 14.7 psi At 18,000 ft = 7.35 psi At 27,480 ft = 4.90 psi At 56,412 ft = 1.00 psi 
