The square

The square oak board (with density ρ = 700 kg/m3) has a side length of 50 cm and a thickness of 30 mm. 4 holes with a diameter of 40 mm are drilled into the board. What is the weight of the board?

Correct answer:

m =  5.14 kg

Step-by-step explanation:

ρ=700 kg/m3 a=50 cm h=30 mm cm=30:10  cm=3 cm n=4 D=40 mm cm=40:10  cm=4 cm  V1=a a h=50 50 3=7500 cm3 r=D/2=4/2=2 cm V2=π r2 h=3.1416 22 337.6991 cm3  V=V1n V2=75004 37.69917349.2036 cm3 ρ2=ρ g/cm3=ρ:1000  g/cm3=700:1000  g/cm3=0.7 g/cm3  m2=ρ2 V=0.7 7349.20365144.4425 g m=m2 kg=m2:1000  kg=5144.4425:1000  kg=5.14 kg=5.14 kg

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