Practice question
Question
A 3kg mass rotates in a circle of radius 0.7m with a speed of 4.2m/s. What is its angular momentum about the center?
Explanation
L = mvr. m = 3kg, v = 4.2m/s, r = 0.7m. L = 3×4.2×0.7 = 8.82kg m2/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 8.82 kg m²/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.