To calculate the combined masses of stars in a binary system, we must measure their To calculate the combined masses of stars in a binary system, we must measure their spectral types and distance from Earth. orbital period and average orbital distance. luminosities and distance from Earth. absolute magnitudes and luminosities.

Idon’t quite understand this problem

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?