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ω = 30 rpm = 0,5 rad/s (dibagi 60, menit ke detik)
Ek = 0,887364 J
m =....?
Jawab:
ω = v/r
0,5 = v/0,3
v = 0,5 x 0,3
v = 0,15 m/s
Ek = 1/2 m v²
0,887364 = 1/2 m 0,15²
0,887364 x 2 = m . 0,0225
1,774728 = m . 0,0225
m = 1,774728/0,0225
m = 78,8768 Kg
D1 r = 30 cm = 0,3 m
ω = 30 rpm
Ek = 0,887364 J
D2. m....?
D3.
1 rpm = 2π / 60 m/s
30 rpm = [2π / 60] x 30 = 3,1416 m/s
Ek = 1/2 m (R.ω)^2
Pembulatan menjadi 2 kg
Jadi, massa roda tersebut 2 kg