A 50 mm*45 mm*20 mm cell phone charger has a surface temperature of Ts = 23°C when plugged into an electrical wall outlet. The surface of the charger is subject to a free convection heat transfer coefficient of h = 4.5 W/m^2.K with the room air having a temperature of 15°C. By assuming steady cpnditions and neglecting radiation, the electric power of the charger is:

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Slope and Deflection

The slope in a deflected beam is described as an angle in radians made by the tangent of the section with the original axis of the beam. The deflection at any point on the axis of the beam is defined as the lateral displacement of the point before and after loading.