48.
【用戶】vincent12029
【年級】幼稚園下
【評論內容】N = (120*f)/P = 120*60/6 = 1200rpmT = P/ww = 2π*(N/60) = 2π*(1200/60) = 40πT = P/w = 24000*3/40π = 1800/π