Under normal conditions, the atmospheric temperature drops 3.5°f per 1000 feet of altitude up to 40,000 feet. when the outside temperature is 80°f, the atmospheric temperature can be modeled by t(x) = − 3.5x + 80, where x is the altitude in thousands of feet.
a. graph the function and identify its domain and range.
b. find and interpret the value of x so that t(x) = − 25

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)