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An ideal gas of density roh=0.2kg/m^3 enters a chimney of height h at the rate of a=0.8kg/s from its lower end, and escapes through the upper end as shown. The cross-sectional area of the lower end is A1=01.m^2 and the upper end is A2=0.4m^2. The pressure and the temperature at the lower end are 600Pa and 300K, respectively, wile its temperature at the upper end is 150K. The chimney is heat insulated so that the gas undergoes adiabatic expansion. Take g=10m/s^2 and the ratio of specific heat of gas gamma=2. Ignore atmospheric pressure. Which of the following statement(s) is (are) correct?
(A) The pressure of the gas at the upper end is 300Pa.
(B) The velocity of the gas ate v1=40m/s and v2=20m/s.
(C) The height of the chimney is 590m.
(D) The density of the gas at upper end is 0.05kg/m^3.


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