Answer Happy

A rotating door is made from four rectangular glass panes, as shown in the figure. The mass of each pane is 82.6 kg. A person pushes on the outer edge of one pane with a force of F = 66.7 N that is directed perpendicular to the pane. Determine the magnitude of the door's angular acceleration. Number Units 1.2m
Conceptual Example 14 provides useful background for this problem. A playground carousel is free to rotate about its center on frictionless bearings, and air resistance is negligible. The carousel itself (without riders) has a moment of inertia of 122 kg-m². When one person is standing at a distance of 1.68 m from the center, the carousel has an angular velocity of 0.595 rad/s. However, as this person moves inward to a point located 0.644 m from the center, the angular velocity increases to 0.860 rad/s. What is the person's mass? Number Units