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a layer of oil (8.95 kN/m3), the thickness of 0.3 mm, between two parallel flat plates. The upper plate is pulled across the bottom plate with a cable connected to a winch. The upper plate moves with a velocity of 0.05 m/s. The area of contact between the upper plate and the oil is 1.5 m2. Determine the kinematic viscosity of the oil if the torque acting on the winch drum should not exceed 24.5 x 10-3 Nm. Take the drum diameter as 50 mm.
0.05kg of CO² with MW=44,occupying a volume of 0.03m³ at 1.025bar,is compressed reversible until the pressure is 6.15bar. Calculate final temperature, the work done on the CO²,the heat flow to or form the cylinder walls
(i)when the process is according to law pV¹.⁴=constant
(ii)when the process is Isothermal
(iii)when the process takes place in a perfectly thermal insulated cylinder.
Assume CO² to be a perfect gas takes Y=1.3
A quantity of a certain perfect gas is compressed from an initial state of 0.085m3,1 bar to a final state of 0.034m3,3.9 bar. The specific heat at constant volume is 0.724kn/kgK,and the specific heat at constant pressure is 1.02kj/kgK.The observed temperature rise is 146K. Calculate,(a)The specific gas constant,R (b) the mass of gas present (d)the increase of initial energy of the gas.)
Oxygen gas expands reversibly in a cylinder behind a piston at a constant pressure of 3 bar. The initial and final volumes are 0.01m3 and 0.03m3 respectively.The initial temperature is 17 degrees celsius. Calculate ,(a)the work input. (b)the heat supplied during the expansion. Assume oxygen to be a perfect gas with molar mass 32kg/mol and take Cp=0.917 kj/kgK
A gas at a an initial pressure of 690KN/m3 and temperature of 185 degrees celsius has a mass of 0.45kg. The gas is expanded adiabatically to a final pressure of 138KN/m2 with a fall of temperature of 135 degrees celsius. If the work transfer during the expansion process is 53kj. (a) sketch the p-v diagram. (b) determine, (i) the specific heat capacity at constant volume.(b) the diabatic index.(iii)the specific heat capacity at constant pressure.
Question #81776
A quantity of gas has an initial pressure of 140KN/m3 and volume 0.14m3. If the gas is occupied to pressure of 700 KN/m3 while the temperature remains constant. (a) sketch the p-v diagram for the process. (b) Determine the volume of the gas at the end of the process.
Design a three-mode temperature control system which inputs error in 0-4 V range. The output to final control element is 0-8 V. Given:
Kp = 2.4 % per %
Ki = 9 % (%/min)/ %
Kd = 0.7 % / (%/min)
A plate of a certain oil weighs 40kN. Calculate the specific mass, weight density and specific gravity of the oil.
Explain how standard form can be used to better communicate information in certain scientific or engineering contexts.
