physics
posted by Anonymous .
A 4.4 diameter merrygoround is rotating freely with an angular velocity of 0.63 . Its total moment of inertia is 1800 . Four people standing on the ground, each of mass 66 , suddenly step onto the edge of the merrygoround.

Funny, I just got to this problem in my physics homework.
Use the Conservation of angular momentum idea, L=Iw. You can find this with your given initial values. Then, you use that L in a new equation, except with the I final and w final (which you want to ultimately find).
Use I=mr^2 to find the mass of the merrygoround. Take that mass and add 4*66. Plug back into equation for new finaly I. (Remember to change the diameter to radius)
Use the L and final I to find final w.
Respond to this Question
Similar Questions

Physics Inertia : Merrygoround
A playground merrygoround of radius 1.96 m has a moment of inertia 335 kg m2 and is rotating at 12.3 rev/min. A child with mass 43.1 kg jumps on the edge of the merrygoround. What is the new moment of inertia of the merrygoround … 
College Physics
A freely rotating merrygoround on a playground has a moment of inertia of 312 kgm2 and a radius of R=2.5 m. It is rotating with ω0=2.8 rad/s when a kid of mass 45 kg is standing on its outer rim. Neglecting friction, what is … 
PHYSICS HELP!
A 3.6 m diameter merrygoround is rotating freely with an angular velocity of 0.78 rad/s. Its total moment of inertia is 1700 kg\m^2. Four people standing on the ground, each of mass 62 kg, suddenly step onto the edge of the merrygoround. … 
Physics
A 3.6 m diameter merrygoround is rotating freely with an angular velocity of 0.78 rad/s. Its total moment of inertia is 1700 kg m^2. Four people standing on the ground, each of mass 62 kg, suddenly step onto the edge of the merrygoround. … 
rotational motion physics
A 3.7 m diameter merrygoround is rotating freely with an angular velocity of 0.63 rad/s. Its total moment of inertia is 1600 kg\cdot m^2. Four people standing on the ground, each of mass 70 kg, suddenly step onto the edge of the … 
physics
A 44.8 child is standing on the outer edge of a merrygoround that has moment of inertia 981 and radius 2.40 . The entire system is initially rotating at 0.180 . Find the angular velocity if the child moves to a final position 1.10 … 
Physics
A 3.6 diameter merrygoround is rotating freely with an angular velocity of 0.73 . Its total moment of inertia is 1600 . Four people standing on the ground, each of mass 60 , suddenly step onto the edge of the merrygoround.What … 
Physics
A 24.5kg child is standing on the outer edge of a merrygoround which has moment of inertia 989 kg • m2 and radius 2.40 m. The entire system is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to … 
Physics
A 24.5kg child is standing on the outer edge of a merrygoround which has moment of inertia 989 kg • m2 and radius 2.40 m. The entire system is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to … 
Physics
A 4.2 m diameter merry go round is rotating freely with an angular velocity of 0.8 rad/s. If its total moment of inertia is 1760 kg*m2, find the angular velocity of the merry go round when four people of 72 kg jump onto the edge of …