Brass ball

What is the weight of a hollow brass ball, the outer diameter of which is 16 cm and the wall thickness is 2 cm, while the density of brass is ϱ = 8.5 g

Correct result:

m =  48.1376 kg

Solution:

R=16 cm h=2 cm r=Rh=162=14 cm  ρ=8.5 g/cm3  V1=43 π R3=43 3.1416 16317157.2847 cm3 V2=43 π r3=43 3.1416 14311494.0403 cm3  V=V1V2=17157.284711494.04035663.2444 cm3  m1=ρ V=8.5 5663.244448137.577 g  m=m1 kg=m1/1000  kg=48137.577/1000  kg=48.138 kg=48.1376 kg



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