Q2) Isothermal, inviscid water at 300K, P 2bar, flows through an expansion in a
ID: 1618196 • Letter: Q
Question
Q2) Isothermal, inviscid water at 300K, P 2bar, flows through an expansion in a circular duct, from 1cm-diameter to 4cm-diameter, entering at V-5m/s. 10p Determine the pressure and velocity at the exit of the expansion. Q3) A Carnot refrigerator has a COP of 10 and a hot-side temperature of 310K. If this refrigerator were run backwards as a Carnot engine, what would be 10p its efficiency? Q4) The air in a 750cc high-pressure paintball tank may be considered an ideal gas, compressed to 31,000 kPa, and initially at 300K. Assume a tank 10p allows 1000 firings, of equal amounts of air. What is the entropy change of the air in J/K from a single shot? Q5) MARVEL Comic's Magneto character is occasionally represented as stopping fleets of bullets coming his direction (physically conceivable 10p because of induced eddy currents). He also eats ordinary food. Assuming the bullets were fired from standard small arms with an average velocity of 500m/s and an average mass of 10g each, and that Magneto eats 2000kcal/day (there are 4184 J/kcal how many bullets per day must be fired at Magneto to starve him out?Explanation / Answer
Hi ,
Please find the below solution.
Entropy =pv/t
=(750×10^-9×31000×10^3)÷300
=0.775
For single shot = 0.775×10^-3 j/k
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