Steam at 260°c and 7. 00 bar absolute is expanded through a nozzle to 200°c and 4. 00 bar. Negligible heat is transferred from the nozzle to its surroundings. The approach velocity of the steam is negligible. The specific enthalpy of steam is 2974 kj/kg at 260°c and 7 bar and 2860 kj/kg at 200°c and 4 bar. Use the open-system energy balance to calculate the exit steam velocity.