Ac = v^2/r
F = m Ac = m v^2/r
= 80 (3.2^2)/2.4
= 341 N
= 340 N to two figures
Calculate the force of friction that keeps a 80-kg person sitting on the edge of a horizontal rotating platform when the person sits 2.4m from the center of the platform and has a tangential speed of 3.2m/s .
Express your answer to two significant figures and include the appropriate units.
1 answer