Hollow sphere

Calculate the weight of a hollow striebornej sphere (density 10.5 g/cm3) if the vnútorný diameter is 13 cm and wall thickness is 5 mm.

Correct answer:

m =  3007.3 g

Step-by-step explanation:

ρ=10.5 g/cm3 D=13 mm h=5 mm cm=5:10  cm=0.5 cm  r1=D/2+h=13/2+21=7 cm r2=D/2=13/2=213=6.5 cm  V1=34 π r13=34 3.1416 731436.755 cm3 V2=34 π r23=34 3.1416 6.531150.3465 cm3  V=V1V2=1436.7551150.3465286.4085 cm3  m=ρ V=10.5 286.4085=3007.3 g

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