A flat surface with area of 7.00 m 2 is oriented at an angle θ to a uniform electric field with magnitude 6.0 × 10 5 N/C. If the flux through this surface is 2.0 × 10 6 N ⋅ m 2 /C, what is θ ?

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3