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Physics, 15.01.2020 22:31 lolorichards123
The intensity of light from a star (its brightness) is the power it outputs divided by the surface area over which it’s spread: i = p 4πd2 . suppose two stars of the same apparent brightness i are also believed to be the same size. the spectrum of one star peaks at 750 nm while the other peaks at 450 nm. use wien’s law and the stefan-boltzmann equation to estimate their relative distances from u
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Physics, 22.06.2019 18:10, coryowens44
Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)
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