Jawabanmu

2014-01-28T19:49:57+07:00
F=60 rotasi per menit, diubah menjadi 1 rotasi per sekon
jadi, f=1
αs= V^2/r = ω²r = 4π²f²r
αs = 4π² . 1² . 0,4
αs=0,8 π²
2014-01-28T20:02:36+07:00
A percepatan sentripetal
as = v²/r
v = 2 π r f
f = n/t

f = 60/60 = 1
v = 2 π x0.04x 1 = 0.08
as = 0.08²/0.04
     = 0.0064 / 0.04 = 0.16 m/s²
b. gaya sentripetal
fs = m x as
   = 0.5 x 0.16
   =0.8