A Manufacturing company has a limit of 25 mg/m3 sulfur dioxide (SO2) in emissions from all of the stacks on their campus. To meet this output limit, the plant operator decides to blend the exhaust stream from a coal-fired boiler with the exhaust stream from a boiler using low-sulfur diesel. If the coal-fired boiler exhaust contains 57 mg/m3 SO2 and the diesel-powered boiler contains 1.5 mg/m3, in what ratio do these two exhaust streams need to be blended before they are released from a stack to meet the SO2 limit? You may assume that SO2 is conservative.

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?