Homework Help: physics

Posted by eric on Monday, April 19, 2010 at 6:04pm.

Damped mass spring system oscillates at 205 Hz. The time constant of the system is 6.6s. At t=0 the amplitude of oscillation is 4.7 cm and the energy of the oscillating system is 26J. What is the amplitude of oscillation at t=9.9s? Answer in units of cm

please help

physics - Damon, Monday, April 19, 2010 at 6:13pm
y = .047 e^-(t/6.6)cos (410 pi t)

But all we need is e^ -(9.9/6.6)
= .223
and
.223*4.7 = 1.05 cm
physics - eric, Monday, April 19, 2010 at 6:15pm
thank you very much

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