4. Water is supplied to a city population for general use (not for drinking) from a river through a cylindrical pipe. The radius of the cross section of pipe is 10 cm. the speed of water through the pipe is 18 km per hour. Find the quantity of water in litres which is supplied to the city in two hours. (1m3 = 1000l)
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We have given that,
radius of pipe is 10cm
and area of cross section=πr^2
=> 22/7 × 10 × 10
=> 2200/7
Speed of water = 18km/hr
Length of water flown in 2hrs
=> 18 × 2km
=> 36km
1km = 10000cm
36km = 36 × 10000cm
= 360000cm
=> Volume of water flown = area × length
=> 2200/7 × 360000
=> 792 × 10^7cm^3
OR
=> 792 × 10^4 litres
We have given that,
radius of pipe is 10cm
and area of cross section=πr^2
=> 22/7 × 10 × 10
=> 2200/7
Speed of water = 18km/hr
Length of water flown in 2hrs
=> 18 × 2km
=> 36km
1km = 10000cm
36km = 36 × 10000cm
= 360000cm
=> Volume of water flown = area × length
=> 2200/7 × 360000
=> 792 × 10^7cm^3
OR
=> 792 × 10^4 litres
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