Practice question
Question
A 40kg wooden plank is placed on a performer’s chest. If each femur has an area of 12cm2, what is the pressure on the femurs? (Take g\=10m/s2)
Explanation
P = FA, F = 40×10 = 400N. Total area A = 2×12×10−4 = 2.4×10−3m2. P = 4002.4×10−3≈1.67×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.67 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.