Tension = T
force up = T
force down = m g
m g - T = m a
torque = I * angular acceleration
T * R = I alpha = I a/R
but I for disk = (1/2) m R^2
T R = (1/2) m R a
T = (1/2) m a interesting :)
m g - (1/2) m a = m a
g = (3/2) a
a = (2/3) g
T = (1/2) m (2/3) g = (1/3) m g
= 1.63 N or B
T-tension, M –torque,
I = mR²/2 -moment of inertia of disc
I•a/R = T•R,
m•2T/m = mg-T,
T=mg/3 =0.5•9.8/3 = 1.63
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