You can't measure thrust in MJ. With perfect efficiency your rocket could produce 5385 N.s of impulse. There is no meaningful comparison between this and therma

You can't measure thrust in MJ. With perfect efficiency your rocket could produce 5385 N.s of impulse. There is no meaningful comparison between this and thermal energy. You most certainly can use rockets on levers to turn a shaft and power a generator, it's just impractical and less efficient than the alternatives in most cases. Turbines work on the same principle but can have efficiencies in excess of 90%, far superior to a rocket, and with far simpler construction. That said, there have been proposals to power rotorcraft like helicopters with blade-tip rocket engines. By this point though you are getting very far away from the Aeolipile, which was an ancient steam turbine.