In SI unit 1 N·m = 0.738 ft·lb
so 1/0.738 = 1 ft·lb
1.355 N·m = 1 ft·lb
(1.355 x 100 x 300) N·m = (100 x 300)ft·lb
406.5 N·m = 300 ft·lb
so P = nT/9.55
where P in watt, 'n' is an rpm, T in Nm and 9.55 is a consttant
P = (500x406.5)/9.55
P = 21282.7Watt or P = 21282.7/746 P = 28.5 hp because 1 hp = 746 watt
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