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diketahui :
R1 = 20 cm
R2 = 5 cm
v = 20π cm/s
ditanyakan :
ω1 = ?
ω2 = ?
jawab :
v = ω1 x R1
20π = ω x 20
ω = π rad/s = π x 60/2π put per menit = 30 putaran per menit
v = ω2 R2
20π = ω2 5
ω2 = 4π rad/s = 4π x 60/2π putaran per menit = 120 putaran per menit
2.)
diketahui :
R1 = 25 cm = 0,25
R2 = 55 cm = 0,55 m
R3 = 40 cm
ω3 = 60 rpm = 60x2π/60 = 2π rad/s
ditanyakan :
ω1 = ?
jawab :
ω2 = ω3
v2/R2 = 2π
v2/0,55 = 2π
v2 = 2π x 0,55 = 1,1π m/s
v1= v2
ω1 R1 = 1,1 π
ω1 0,25 = 1,1 π
ω1 = 4,4 π rad /s = 13,816 rad/s