(a) If the security guard walks to a position that is a distance from the center, what is the resulting angular speed of the guard and merry-go-round

What are the phases shown in a and d called?

Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

Could someone . i have tried to solve myself but my calculation is off