Suppose we take a 1 m long uniform bar and support it at the 27 cm mark. Hanging a 0.31 kg mass on the short end of the beam results in the system being in balance. Find the mass of the beam.

Answer 1

clockwise moments about support (ignoring g which cancels)

(50 - 27) m - 27(.31) = 0
23 m = 8.37
m = 0.364