Question

11 The main falls 10cm on a particular day. The rain water that falls on a roof 70 m long and 44 m wide was collected in a cylindrical tank of radius. ,Find volume of water that fall on the roof
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Answer 1

Answer:

A) l=70; b= 44m and h= 10 cm = 0.1 m

So, volume of water on roof = lbh =

70×44×0.1=308m3 (As, the rainwater will form

a cuboidal shaped solid on the roof)

(b) Let h be the height of the water in the tank.

Volume of the water in

tank=πr2h=227×142h=616h

As, the water is falling to the tank from the roof,

So 308= 616h

h= 308/616=0.5 m