vol = 4/3 pi r3 = 4/3 pi 1728 = 2304 pi = 7238.23 cm3, taking pi as 355/113
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Put an exact amount of water in a measuring cup. Drop in a golf ball. The increase in water level equals the volume of the golf ball, assuming the ball doesn't float. For example, 200mL before ball. 280ml after ball dropped in. Therefore volume equals 40ml or 40 Cubic Centimeters.
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Volume formula for a sphere is 4/3*π*r3 so volume of ball with radius of 4.6 cm is 4/3*3.14159*(4.6cm)3 = 407.72 cm3
You need two things. 1. That fact that density X volume = mass Snow density varies. Some snow if very compact and some is light and fluffy. The range of density of snow is around 100-500 kg per cubic meter. 2.Now find the volume of each "ball" that makes up your snowman by using the formula that the volume of each ball using V=(4/3)πr^3 where r is the radius of the ball. After you find the volume of each ball, multiply by the density and that is the mass of that ball. Do it for all 3 and you the the snowman's mass.
Use the formula volume = (4/3) pi r3.