A fan is used to cool a computer case (dimensions: 12 cm x 40 cm x 40 cm). In the case, half of the volume is filled with components and the other half is air space. A hole (diameter: 5 cm) at the back of case allows the installation of the fan, which continuously replace air (p = 1.20 kg/m) in the void space every second. In the market, the combined motor-fan units (overall efficiency = 30%) can be purchased. Assume kinetic energy correction factor = 1.10 if it is needed. Compute (a) the required electric power input of the motor-fan unit and (b) the pressure difference across the fan. Streamline elect Fan Casing