Outside 30931

The water barrel, 90 cm high and 60 cm wide, has no lid (upper base). How much paint do we need to paint the barrel from the outside? If 1 kg of paint is enough for 8m2.

Correct answer:

x =  0.2474 kg

Step-by-step explanation:

h=90 cm m=90:100  m=0.9 m D=60 cm m=60:100  m=0.6 m  r=D/2=0.6/2=103=0.3 m  S1=π r2=3.1416 0.320.2827 m2 S2=π D h=3.1416 0.6 0.91.6965 m2 S=S1+S2=0.2827+1.69651.9792 m2  ρ=1/8=81=0.125 kg/m2  x=ρ S=0.125 1.9792=0.2474 kg

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