Practice question
Question
An aircraft (m\=2.5×105kg, wing area 400m2) flies at 900km/h. What is the pressure difference across the wings? (Take g\=10m/s2, ρair\=1.2kg/m3)
Explanation
ΔP⋅A = mg, mg = 2.5×105×10 = 2.5×106N. A = 400m2. ΔP = 2.5×106400 = 6250Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 6250 Pa. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.