- #1
toothpaste666
- 516
- 20
Homework Statement
Consider a simple pendulum (point mass bob) 0.55m long with a Q of 370.
a) How long does it take for the amplitude (assumed small) to decrease by two-thirds?
b) If the amplitude is 2.9cm and the bob has mass 0.22kg , what is the initial energy loss rate of the pendulum in watts?
Homework Equations
ω=sqrt(g/L) D = xcosωt
The Attempt at a Solution
a) 2/3A = Acos(sqrt(g/L)t)
2/3 = cos(sqrt(g/L)t)
cos^-1(2/3) = sqrt(g/L)t
sqrt(L/g)cos^-1(2/3) = t
t = .20
but that is wrong and it doesn't use Q. this problem has me stuck