Little Pumpkin, a miniature horse owned by J$.$ C$.$ Williams, Jr$.,$ of South Carolina, had a mass of about $9\mathrm{.}00kg.$ Consider Little Pumpkin on a twin$-$pan balance. If the mass on the other pan is $8\mathrm{.}00kg,$ what equal and opposite charges must be placed as shown in the diagram below to maintain equilibrium?