An open-circuit wind tunnel draws in sea-level standard air and accelerates it through a contraction into a 1 m-by-1 m test section. A differential pressure transducer mounted in the test section wall measures a pressure difference of 45 mm of water between the inside and outside. Estimate
(a) the test section velocity in miles/h and
(b) the absolute pressure on the front nose of a small model mounted in the test section.