m=2kg, r=1.2m, f=120rev/min ; T=?f= 120rev1min × 1min60s = 2rev\sw=2πf= 2×π×2= 4πrad\sT= mv2r, but v = wr ⇒ T = (m)(wr)2r⇒ T = mw2r= T = 2× (4π)^2 × 1.2 T = 379N ( to 3 s.f)
