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Methane (CH.) enters a 3-em iD pipe at 30+C and 10 bar with an average velocity. of 5.00m/s and emerges at a point 200m lower than the inlet at 30C and 9 bar. a) Without doing any calculations, predict the signs t or - of Bk and Qp ": where signifies (outlet - inlet). Briefly explain your reasoning [3] b) Calculate EW and EF(W), assuming that the methane behaves as an ideal gas c) If you determine that Ek=Ep, explain how that resuit is possible. [1] d) Write the energy balance for a closed system and for each term mention the condition under which it can be neglected. [6]