Engineering, 26.09.2019 18:30, adamflex
Arigid (constant volume) tank sealed by a valve initially contains 100 kg of air at a pressure of 100 kpa and 300 k. at time = 0, the valve for the air tank is opened in a controlled manner and air leaks out isothermally (constant temperature) of the tank at a constant mass flow rate of 1 kg/s. the valve is closed after 75 seconds. answer the following questions using the mass values calculated previously for the problem from lecture 3: a. the total change in internal energy of the air tank, in kj, if the specific internal energy for air is 214.1 kj/kg. b. the heat transfer of the process, in kj, if kinetic and potential energies are neglected and the specific enthalpy for air at 300 °c is 300.1 kj/kg.
Answers: 2
Engineering, 04.07.2019 18:20, krojas015
Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?
Answers: 3
Engineering, 04.07.2019 19:10, jennymares
Abarometer contains mercury with a density of 13600 kg/m3. atmospheric conditions are 95.8 kpa and 20 °c at 20 °c, the vapor pressure of the mercury is 0.000173 kpa. the column of mercury will rise to a height of most nearly. select one: a)- 0.38 m b)- 0.82 m c)- 0.48 m d)- 0.72 m
Answers: 1
Arigid (constant volume) tank sealed by a valve initially contains 100 kg of air at a pressure of 10...
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