In this page combination of solids solution9 we are going to see solution some practice questions of the worksheet combination of solid worksheet2.
Though a cylindrical pipe of internal radius 7 cm, water flows out at the rate of 5 cm/sec. Calculate the volume of water (in liters) discharged through the pipe in half an hour.
Now we need to find volume of water (in liters) discharged through the pipe in half an hour. For that let us convert speed into seconds.
half an hour = 30 minutes
let us change minutes into seconds. For that we have to multiply 30 by 60. Because 60 seconds = 1 minute.
30 x 60 = 1800 seconds.
Volume of water discharged in
half an hour = Area of cross section x time x speed
= Π r² x 5 x 1800
= (22/7) (7)² x 5 x 1800
= (22/7) x (7) x (7) x 5 x 1800
= 22 x 7 x 5 x 1800
= 1386000 cubic cm
But here we have to find volume of water discharged in liters. For that we have to use the following conversion that is
1000 cm³ = 1 liter
= 1386 liter
combination of solids solution9 combination of solids solution9