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A 20-mm-diameter sphere is suspended in a dry airstream with a temperature of 22°C. The power supplied to an embedded electrical heater within the sphere is 2.51 W when the surface temperature is 32°C. How much power is required to maintain the sphere at 32°C if its outer surface has a thin porous covering saturated with water? Evaluate the properties of air and the diffusion coefficient of the air-water vapor mixture at 300 K.
The uniform slender bar of mass m is rigidly attached to the homogeneous disk of mass 3m. The assembly is free to rotate about the pin at O. Determine the frequency f of small oscillations about the equilibrium position shown.
air at -10 degree c flows over a smooth sharp-edged almost-flat aerodynamic surface at 240 kmhr. the surface is at 10
A high-speed jet is used to cut solid materials. Estimate the maximum pressure developed on the material if the velocity issuing from the water jet is ( a ) 100 m = s, ( b ) 120 m = s, and ( c ) 120 m = s.
Steam enters the turbine of a Rankine cycle at 16 MPa, 5608C. The condenser pressure is 8 kPa. The turbine and pump each have isentropic efficiencies of 85%, and the mass flow rate of steam entering the turbine is 120 kg/s. Determine
a rankine cycle power plant is to be used as a stationary power source for a polar research station. the working fluid
A helical spring is to be constructed from a 4340 steel. The design calls for 5 coils, a coil-to-coil diameter of 12 mm, and a wire diameter of 3 mm.
hot air at a temperature of 60c is flowing through a steel pipe of 10 cm diameter. the pipe is covered with two layers
what energy practices today are unsustainable? list three examples and write a short paragraph on each explaining why
suppose the rocket was initially on a circular orbit around earth with a period of 1.2 days.a what is its orbital
an aqueous ester hydrolysis reaction a -gt b c has k 0.02 min-1 and an equilibrium constant of 10 with all
a pure jet engine propels an aircraft at 250 ms through air at 45 kpa and -13 degc. the inlet diameter of this engine
The velocity of a fluid particle moving along a horizontal streamline that coincides with the x axis in a plane, twodimensional, incompressible flow field was experimentally found to be described by the equation u = x2 .
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