Determine the theoretical open circuit voltage of h2-02 fuel cells, and determine which reactant would be the oxidizer and which would be the fuel for a galvanic reaction. detern the theoretical open circuit voltage (potential) that would be required to generate hydrogen peroxide h202, with gaseous hydrogen oxygen. [10 point 6. fuel cell considered as a combined heat and power device. a given fuel cell has a st a dc, an operating voltage of 0.55 v, and an overall resistance of 5 mq at 1.2 a/cm density calculate: a) the potential loss in volt from ohmic resistance, at this condition. b) the total electrical work produced in 4 h. c) the rate of ohmic heat dissipation from the cell in watt.

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg. m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?