Q2. A 75 m long cast iron pipe, 15 cm in diameter, connects two tanks (open to the atmosphere) that have a water surface elevation difference of 5 m. The

entrance of the pipe from the supply tank is square edged, and the pipe contains a 90° bend with a sharp, 15 cm radius. Determine the flow rate in the \text { pipe. Use } f=\frac{0.25}{\left[\log \left(\frac{e / D}{3.7}+\frac{6.71}{N \cdot 9.9}\right)\right]^{2}}