Both markers ride the same spinning disc, so they share one angular velocity ω, one period T and one frequency f. Slide the outer marker away from the axis and watch what actually changes: its tangential speed v = ωr and its centripetal acceleration — never the rotation rate.
Angular velocity ω = 2π · rpm ÷ 60
6.283 rad/s
equivalent to 60.00 rpm
Rotation timing T = 60 ÷ rpm · f = 1 ÷ T
Period T1.000 s
Frequency f1.000 Hz
Tangential speed v = ωr
Outer, r = 0.80 m5.027 m/s
Inner, r = 0.40 m2.513 m/s
Halve the radius and you halve the speed — the rotation rate never moves.
Centripetal acceleration a = ω2r
31.58 m/s2
inner marker: 15.79 m/s²
Angle swept since reset θ = ωt
0.000 rad
0.000 revolutions
Rotation rate60 rpm
Outer marker radius r0.80 m
Fixed: the inner marker always sits at half the outer radius · disc radius 1.00 m
Tip: park the rpm slider and drag the radius from 0.05 to 1.00. The speed and acceleration readouts climb hard; ω, T and f do not twitch.