The quasar that appears the brightest in our sky, 3c 273, is located at a distance of 2.4 billion light-years. the sun would have to be viewed from a distance of 1300 light-years to have the same apparent magnitude as 3c 273. using the inverse square law for light, estimate the luminosity of 3c 273 in solar units.

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.