The Answer is D cause of the people going back and forth.
ΔH2 = - δH1 δH2 = - 2 x δH1 δH2 = 2 x <span>δ</span>H1
the unnamed spacecraft which travels to Mars, will have the greatest weight on the Earth.
Http://water.ky.gov/groundwater/Pages/GroundwaterAwareness.aspx
Explanation:
using Boyles law: which shows the relationship between pressure and volume, when temperature Is kept constant
P1V1 = P2V2
2 x 7.2 = 0.5 x V2
14.4 = 0.5 x V2
V2 = 14.4/0.5 = 28.8 L
Hence the new size of the balloon in litres is 28.8