Q1. In brief explain the changes that the Sun will go through after it exhausts its core hydrogen. Be sure to describe both the changes occurring in the Sun's core and the changes visible from outside the Sun. What do we mean by the stages we call hydrogen shell burning, helium burning, and double shell burning?
Q2. Imagine all surfaces to be frictionless and the inertia of pulley and cord legible. Find the horizontal force essential to avoid any relative motion of mm and M?