Gravity

On stardate 2364.03.3 Captain Jean-Luc Picard heads the Enterprise-D (NCC-1701-D) around a supernova when suddenly the engines give out and the Enterprise gets pulled into an orbit around the supernova. Their orbit radius(from c.g. of vessel to the apparent edge of supernova) is 19,000km, the supernova has a mass of 1.25x1036kg and radius of 20,000km, and the vessel has a mass of 42,000kg.

a)Calculate the gravitational force on the Enterprise.
b)What is their orbit velocity?
c)At their current velocity, will their vessel be able to their current orbit? Explain and prove.