Some scientists believe that the chain of underwater mountains beneath the Pacific, which stretches away from Hawaii up to Alask
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Answer:
(a)
(b) : From the air to the surroundings.
Explanation:
Hello,
(a) In this case, we can compute the area at the entrance by firstly computing the inlet volumetric flow:
Then, with the velocity, we compute the area:
(b) In this case, via the following energy balance for the nozzle:
We can easily compute the change in the enthalpy by using the given Cp and neglecting the work (no done work):
Finally, the heat turns out:
Such sign, means the heat is being transferred from the air to the surroundings.
Regards.