A playground toy has four seats, each 6.9 k g , attached to very light rods of l

Question

A playground toy has four seats, each 6.9kg , attached to very light rods of length r = 1.5m , as seen from below in the figure

If two children, with masses of 13kg and 20kg , sit in seats opposite one another, what is the moment of inertia about the rotation axis?

A playground toy has four seats, each 6.9kg , attached to very light rods of length r = 1.5m, as seen from below in the figure If two children, with masses of 13kg and 20kg , sit in seats opposite one another, what is the moment of inertia about the rotation axis?

Explanation / Answer

Moment of Inertia = 4*mr^2 + M1r^2 + M2r^2

= 4*6.9*1.5^2 + 13*1.5^2 + 20*1.5^2

= 136.35 Kgm^2

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