A steel cantilever beam, carrying a weight of 0.1 lb at the free end, is used as a frequency meter. The beam has a length of 10 in., width of 0.2 in., and thickness of 0.05 in. The internal friction is equivalent to a damping ratio of 0.01. When the fixed end of the beam is subjected to a harmonic displacement y(t) = 0.05coswt, the maximum tip displacement has been observed to be 2.5 in. Find the forcing frequency.