1. The problem statement, all variables and given/known data What is the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is 1.30? Neglect the mass of the balloon fabric and the basket. 2. Relevant equations g=9.81 m/s^s 3. The attempt at a solution I thought it would just be 1.3 times g= 1.3(9.81)=12.75 m/s my hw says it is wrong...why?