Four hundred grams of nitrogen gas (molecular weight = 28 g/mole) are stored in a 10-liter container. Set up an Excel worksheet to determine the pressure of the gas (in atmospheres) as a function of temperature and volume, assuming nitrogen is an ideal gas. Place the value of each variable in its own cell. Label all of the quantities clearly. Recall that the ideal gas law is PV=nRT where P = pressure (atmospheres) V = volume (liters) n = number of moles (mass of gas/molecular weight) R = ideal gas constant (0.082054 liter atm/mole K) T= absolute temperature (°K = °C + 273) (a) What pressure in atm corresponds to a temperature of 17.5°C?

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?