Question1
Illustration on Eratosthenes' process, if two observers are due north and south of each other and are detached by 400 km, what is circumference of their spherical world if they see the similar star on their meridian at altitudes of 23 degrees and 47 degrees respectively, and at exact same time?
Question2
If I've only taken IGCSE Physics before, can I take Phy 103 in college? I have done calculus in IB Math SL and IB Chemistry HL, but not IB physics. This is actually significant because I want 2 semesters of Physics (103 and 104) to get a BSE in Operations Research and Financial Engineering. I require an answer urgently.