Capacitance (in $$F$$) of a spherical conductor with radius $$1$$ $$m$$ is

Moment of inertia of a circular wire of mass $$M$$ and radius $$R$$ about its diameter is

The escape velocity of a body depends upon mass as

A spring of force constant $$800$$ $$N/m$$ has an extension of $$5$$ $$cm.$$ The work done in extending it from $$5$$ $$cm$$ to $$15$$ $$cm$$ is