I need help with the free body diagram. Also please breakdown what the values for the buoyant forces are if possible

10. A balloon is filled with helium (density = 0.178 kg/m ) to a volume that has a radius of 1.50 m and is then connected to a string as shown in the figure. If the mass of the skin of the balloon is 1.95 kg, determine the tension in the string when the balloon is at equilibrium. The density of air is 1.30 kg/m3