Practice question
Question
An aircraft (m\=3.0×105kg, wing area 450m2) flies level. What is the pressure difference across the wings? (Take g\=10m/s2)
Explanation
ΔP⋅A = mg. mg = 3.0×105×10 = 3.0×106N, A = 450m2. ΔP = 3.0×106450 = 6666.67Pa≈6667Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 6667 Pa. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.