291. Compute the pressure drop of 35°C air flowing with a mean velocity of 5m/s in a circular

sheet-metal duct 400mm in diameter and 25 m long. Use friction factor, f = 0.04, and ρair =

1.3799 kg/m3

.

A. 431.22 Pa B. 221.34 Pa

C 312.24 Pa D. 422.31 Pa