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According to a recent article, hot-air volumes must be large because air heated to 150 degrees Fahrenheit over ambient lifts only .018 lbf/ft^3 compared to .066 and .071 for helium and hydrogen, respectively. Check these statements for sea-level conditions. Calculate the effect of increasing the hot-air maximum temperature to 250 degrees Fahrenheit above ambient.
a closed rigid tank whose volume is 1.5 m3 contains refrigerant 134a initially a two phase lipuid-vapor mixture at 10c.
during this process heat is exchanged with surrounding such that the entire air remains at 30 degree celsius at all times.determine the heat transfer for this process.
You are designing a remote-area power supply based on a miniature wind turbine that is 20% efficient. Meteorological data indicates an average wind speed of 24 km/h at an air temperature of 10oC and pressure of 0.9 atm. The rotor has a diameter of..
a cylindrical bioreactor of diameter 3 m has four baffles. a marine impeller mounted in the reactor has a diameter 13
a liquid-vapor mixture of h2o at 2 mpa is heated in a constant volume process. the final state is the critical point. a
water flows 2m deep at 2ms in a rectangular channel. find the change in depth and in water surface elevation caused by
a rigid tank has a volume of 0.06m3 and initially contains a two-phase liquid-vapour mixture of nbsph2o at a pressure
a hollow 6 ft. diameter sphere floats half-submerged in seawater. what mass of concrete is required as an external
an electric motor of total weight 3330 pounds is mounted on a simply supported beam with an overhang as shown
given that the relaxation time a is 177.46 days what is the activation energy of a rubber band if the pre-exponential
Building HVAC Requirements - Indoor Air Quality and Mechanical Ventilation and how determine the size of the equipment if i need for 60cfm.?
where k is the coefficient of kinetic friction between the blocks and the ground. Also, what is the distance the blocks slide on the surface before they separate?
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