$($a$)$ Calculate the buoyant force on a $2\mathrm{.}60$ Liter helium balloon.

N $($upward$)$

$($b$)$ Given the mass of the rubber in the balloon is $1\mathrm{.}00$ grams, what is the net vertical force on the balloon if it is let go$?$ Consider the buoyant force on the balloon, and the weight of the rubber and the helium inside the balloon. The volume of the rubber itself is negligible.

N $($upward$)$