1. The problem statement, all variables and given/known data Pulley with Friction A spool of thin wire pivots on a shaft, and there is friction. The wire is pulled by a hanging mass M of 1.30 kg. After falling a distance D= 1.7 m starting from rest, the mass has a speed of 0.065 m/s. Calculate the energy lost to friction during that time. Inner radius, ri = 0.50 m Outer radius, r0 = 0.65 m Icm= 0.96 kg/m2. 3. The attempt at a solution a=v^2/2*D -> a=0.0036 T=m(g-v^2/2*D) -> T=12.24 alpha=a/r0=(r0*T-Qf)/Icm -> Qf=7.951 theta=D/r0 ->2.62 Ef=theta*Qf -> Ef=20.83 what am I doing wrong?