Adisk-shaped merry-go-round of radius 3.03 m and mass 125 kg rotates freely with an angular speed of 0.661 rev/s . a 59.4 kg person running tangential to the rim of the merry-go-round at 3.51 m/s jumps onto its rim and holds on. before jumping on the merry-go-round, the person was moving in the same direction as the merry-go-round's rim.

Explanation:

given,  

radius of merry - go - round = 3.03 m  

mass of the disk = 125 kg  

speed of the merry- go-round = 0.661 rev/s

speed = 3.51 m/s  

mass of person =59.4 kg  

initial angular momentum of the system  

final angular momentum of the system  

from conservation of angular momentum  

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.