3 lb = 1.3608 kg, and 400 ft/s = 121.92 m/s. Plugging those into the equation, I got 10,114 Joules as the kinetic energy for one such arrow. For comparison:
Pistols
.357 Magnum: 609 to 778 Joules
.454 Casull: 2,483 to 2,607 Joules
But it's not really fair to compare a full-blown longbow to pistols, is it?
Rifles
.460 Weatherby Magnum: 9,588 to 10,174 Joules
.50 BMG: 15,482 to 20,195 Joules
As a first order approximation, it looks like the Orc longbow compares very well against all but the biggest rifles!
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