Nitrogen is heated in an arcjet from 300 to 7350 K at 1 atm and dissociates almost entirely to atomic nitrogen. One-third of the electrical power supplied is lost to the arc chamber walls. The heated N then expands in a nozzle of area ratio A/A* = 100 to vacuum. Assuming frozen flow and negligible effects of friction and heat transfer, estimate the specific impulse and the thrust-to-power ratio. Take γ = 5/3.
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