# cross sectional area

• Nov 21st 2006, 01:11 PM
si55ler
cross sectional area
A cylindrical pipe of diameter 1.5m contains water to a depth of 0.9m.

a) find the cross sectional area of the water

b) if the water is flowing at a rate of 60 litres per second find the speed of the water in meters per second
• Nov 21st 2006, 02:10 PM
Jameson
A) Diameter = 1.5m, so Radius is 0.75m.

Cross-sectional area is a circle with radius 0.75m. So $A=\pi (0.75)^2 \approx 1.77m^2$

B) $\frac{60L}{s} \times \frac{.001 m^3}{1L}$
• Nov 21st 2006, 08:39 PM
CaptainBlack
Quote:

Originally Posted by si55ler
A cylindrical pipe of diameter 1.5m contains water to a depth of 0.9m.

a) find the cross sectional area of the water

b) if the water is flowing at a rate of 60 litres per second find the speed of the water in meters per second

The area you seek is the shaded area in the attachment.

If this area is A, and the speed of the water is v m/s then the volume flow rate is Av cubic metres/s
or 1000 Av ltrs/s.

RonL