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A spherical satellite of diameter D is in orbit about the earth and is coated with a diffuse material for which the spectral absorptivity is aA = 0.6 for A 3 µ,m and aA = 0.3 for A > 3 µ,m. When it is on the "dark" side of the earth, the satellite sees irradiation from the earth's surface only. The irradiation may be assumed to be incident as parallel rays, and its magnitude is GE = 340 W/m2.
On the "bright" side of the earth the satellite sees the earth irradiation GE plus the solar irradiation GS = 1368 W/m2. The spectral distribution of radiation from the earth may be approximated as that of a blackbody at 280 K, and the temperature of the satellite may be assumed to remain below 500 K. intends to use a checker pattern for which a fraction F of the satellite surface is coated with an evaporated aluminum film (s = 0.03, aS = 0.09), and the fraction (1-F) is coated with a white, zinc-oxide paint (s = 0.85, aS = 0.22).
Assume the satellite is isothermal and has no internal power dissipation. Determine the fraction F of the checker pattern required to maintain the satellite at 300 K.
a two phase liquid-vapor mixture of h2o is initially at 2.0 mpa with a quality of 90 is contained in a rigid well
Sketch crystallographic planes with the following Miller-Brava is indices in a hexagonal unit cell: (a) 1(Bar)101 ; (b) 2(Bar)112 . Mark the origin and axes. Explain your answers.
A mass weighs 15 Newtons on the moon, where the acceleration of gravity is 1.67 m/s^2. Determine the weight, in Newtons, on Mars where g= 4.23 m/s^2
A radiator wall measuring 2 m by 3 m (WxH) is held a temperature of 125 °C. Straight aluminum fins (k = 175 W/mK) are to be mounted on the wall. The fins are 5 cm in length and 0.8 mm thick. The system is allowed to convectively transfer heat to ambi..
air is compressed steadily by a reversible compressor from an inlet state of 100kpa and 300k to an exit pressure of 900
a solid cube of wood having dimensions of 0.5 m3 is floating in water with 0.3 m of its dimension above the surface.
two particles of equal weight are released from rest on a 35 degree incline when they are 20 m apart. the coefficient
wall temperature needed for the runner to cylinder #3, such that the cylinder air inlet temperature is the same as that in cylinder #1. Runner length for cylinder #3 is 15 cm.
there are two connected spur gears attached to a fixed board at points a and b. the assumptions of the system are that
consider flow of water over a flat plate of length 5 m. on one graph plot the both the drag caused by shear stress and
5 lbm per second of saturated water vapor enters an adiabatic compressor at 300oF where it is compressed to 800 psi. If the power input is 2,150 hp, what is the isentropic efficiency?
A liquid is filtered at pressure of 200 kPa through a 0.2 m2 filter. Initial results indicate that 5 minutes is required to filter 0.3 m3 of liquid. Determine the time that will elapse until the rate of filtration drops to 5 * 10-5 m3 s-1. The filter..
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