A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg · m 2 is rotating freely with an angular speed of 1.0 rad/s. Two people, each having a mass of 60 kg, are standing right outside the edge of the merry-go-round and step on it with negligible speed. What is the angular speed of the merry-go-round right after the two people have stepped on?

angular speed = 0.4 rad/s

Explanation:

given data

radius = 5 m

moment of inertia = 2000 kg-m²

angular speed = 1.0 rad/s

mass = 60 kg

to find out

angular speed

solution

Rotational momentum of merry-go-round = I?

we get here momentum that is express as

momentum = 2000 * 1

momentum = 2000 kg-m²/s

and

Inertia of people will be here as

Inertia of people = mr² = 60 * 5²

Inertia of people = 1500 kg-m²

so Inertia of people for two people

1500 * 2 = 3000

and

now conserving angular momentum (ω)

moment of inertia * angular speed = (momentum + Inertia of people) angular momentum

2000 * 1 = (2000 + 3000) ω

solve we get now

ω = 0.4 rad/s