Problem #1: One day, while you're wandering through the streets of Lewisburg, you look up and notice two United States Air Force A-34 "Flying Weasel" fighter planes flying in formation directly overhead. You quickly measure that the angle between the line from you to the first plane and the line from you to the second plane is 4.7 degrees (that is, their angular separation is 4.7 degrees). Knowing as you do that when flying in formation, "Flying Weasels" are separated by 18 meters, you can calculate their altitude above your head. How high up are they?
Problem #2: Calculate the radius of a Main Sequence B0 star (which has a surface temperature of 3 x 104 K, and a luminosity of 1 x 103 Lo, where Lo means "solar luminosities").
Problem #3: a) Calculate the distance
to a star whose parallax is 0.012 arcseconds (NOTE: 1 arcsecond = 1/3600th of a degree).
b) If this star has the same luminosity as the Sun,
what is its flux (in W/m2) when viewed from the Earth?