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LECTURE duration 52 minutes 49 seconds LECTURE LECTURE	LECTURE Zoom Recording ID: 96071157995 UUID: MeW/WR8tSkKJqQaXSu9ZwA== Meeting Time: 2021-02-24T18:04:16Z times equation thing spring mass matrix omega solution modes minus sine k2 side dot equations x1 masses mode constants problem From Andy Ruina 1 plays