. The Sun is a yellow star. The closest star is Proxima Centauri, which is a red dwarf. How do these two stars compare to each other?

May someone explain how to do this question?

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.