Asingle pane window in your home has a thickness of 3 mm. assume it has an area a-1 m2. the outside temperature is 20 °c warmer than inside the house. (a) calculate the heat current (rate of heat flow) into the house by conduction through the glass window. (b) if you replace the single pane window with a double pane window (2 glass sheets similar to the one above, which are separated by an airspace of 3 mm), calculate the heat current into the house. assume no convection occurs in the airspace. (c) assume you replace the air between the windows with ar. calculate the heat current into the house. d) which window would be best for your house, and why?

How are calculation for velocity and speed different

Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame

Which types of electromagnetic waves have higher frequencies than the waves that make up ultraviolet light? check all that apply. radio waves infrared light microwaves gamma rays visible light x-rays