Reinforcement 42491

The concrete ring (used for reinforcement in wells) has an inner diameter of 800 mm and an outer diameter of 900 mm. It is made of concrete with a density of 2,500 kg/m3. Its height is 1 m. Calculate its mass.

Correct answer:

m =  333.7942 kg

Step-by-step explanation:

d=800 mm m=800:1000  m=0.8 m D=900 mm m=900:1000  m=0.9 m ρ=2500 kg/m3 h=1 m  r1=d/2=0.8/2=52=0.4 m r2=D/2=0.9/2=209=0.45 m  S1=π r12=3.1416 0.420.5027 m2 S2=π r22=3.1416 0.4520.6362 m2  S=S2S1=0.63620.50270.1335 m2 V=h S=1 0.13350.1335 m3 m=ρ V=2500 0.1335=333.7942 kg

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