Two point masses of 0.3 kg and 0.7 kg are fixed at the ends of a rod of length 1.4 m…
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
Two point masses of 0.3 kg and 0.7 kg are fixed at the ends of a rod of length 1.4 m and of negligible mass. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. The point on the rod through which the axis should pass in order that the work required for rotation of the rod is minimum, is located at a distance of
(1) 0.42 m from mass of 0.3 kg
(2) 0.70 m from mass of 0.7 kg
(3) 0.98 m from mass of 0.3 kg
(4) 0.98 m from mass of 0.7 kg