Problem 4: A weather balloon has an absolute-pressure sensor attached. On the ground the sensor reads PA = 1.01x10 Pa. At a height of h = 974 m, the sensor reads PB = 8.81x10 Pa. В A Part (a) Assuming air is an incompressible fluid, enter an expression for an estimate of the density of air, in terms of the defined quantities and the acceleration due to gravity, g. Expression : Select from the variables below to write your expression. Note that all variables may not be required. B. Y, 8, b, d, g, h, j, k, m, n, P, PA, Pg. S Part (b) Calculate the density of air, in kilograms per cubic meter, assuming it is an incompressible fluid. Numeric : A numeric value is expected and not an expression.

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