If the frequency of a rotating platform is v and the distance of a boy from the centre is r, what is the area swept out per second by the line connecting the boy to the centre?

If the frequency of a rotating platform is v and the distance of a boy

1.	If the frequency of a rotating platform is v and the distance of a boy from the centre is r, what is the area swept out per second by the line connecting the boy to the centre?
Answer» `pi r upsilon` ` 2 pi r upsilon` `pi r^(2) upsilon` `2PI r^(2) upsilon` Solution :Area swept out PER second = Area swept in one ROTATION `XX` Number of rotations per UNIT time `= pi r^(2) upsilon`