A rotating door is made from four rectangular glass panes, as shown in the drawi

Question

A rotating door is made from four rectangular glass panes, as shown in the drawing. The mass of each pane is 75 kg. A person pushes on the outer edge of one pane with a force of F = 50 N that is directed perpendicular to the pane.

a.) Find the rotational inertia of the door. My Answer is correct: 144kgm2


b.) Find the magnitude of the door's angular acceleration. My Answer is correct: .416rad/s2


c.) Find the time it would take to rotate the door a half-circle (assuming it started from rest.)
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Explanation / Answer

Initial angular speed = ?i = 0 Angular displacement = ? = p Time taken = t Using: ?= ?i t + (1/2) a t^2 ?= (1/2) a t^2 This implies: t= v[2?/a] = v[2p/0.416] = 3.8851 s

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