mahogany: rainfall on a flat rectangular roof 10m by 5.5m flows into a cylinder with a radius of 3m. find in cm the increase in depth of the water in the cylinder by rainfall of 1.2cm.
give you answer to 2 significant figures
Hi Mahogany
rainfall = 1.2cm = 0.012m Everything has to be in the same units.
Volume of water collected on the rooftop = 55 x 0.012 = 0.66m
3 When this water goes into the cylinder
Volume = area of base * height
0.66 = 9*pi*height
0.66/(9*pi) = height
height = 0.0233427m = 2.3 cm (correct to 2 sig figures)
140125 Volume .JPG
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