1. The problem statement, all variables and given/known data What is the magnitude of the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is 1.25? Neglect the mass of the balloon fabric, the basket and it contents. I don't know how to do a rho so "p" will be rho for density and P will be for pressure o = outside of balloon i=inside of balloon po = 1.25pi po (of air) = 1.2 kg/m^3 Po = 1atm = 101.3 kPa 2. Relevant equations P+1/2pv^2+pgy = P+1/2pv^2+pgy p = m/v P=F/A 3. The attempt at a solution I'm really stuck at the beginning of this problem. I can't seem to find any way to link density and acceleration (without time and a distance or and area). Any suggestions? Also are my assumptions about Po and po right? Seeing at I'm unsure of the elevation/air temp I can't be sure. Also are there other assumptions I should be making? Thanks!