Practice question
Question
A 70kg person stands on two bones, each with area 16cm2. What is the average pressure on the bones? (Take g\=9.8m/s2)
Explanation
Pav = FA, F = mg = 70×9.8 = 686N. Total area A = 2×16×10−4 = 3.2×10−3m2. Pav = 6863.2×10−3 = 2.14375×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 2.14 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.