1. "Heat" does not necessarily rise, but warm air does. Why? 2. Why does the balloon rise when it is filled with a gas such as helium? By contrast, what happens to the balloon if it is filled with carbon dioxide (CO2)? 3. What forces act on the helium-filled balloon as it rises, and once it reaches the limit of the cord you are holding it by? 4. Obviously, if the balloon is large enough and you continue to hold onto the cord you may be lifted off of the ground. Using physics, how would you predict beforehand whether this will happen? 5. Suppose you miscalculated and were lifted off the ground, if the cord on the balloon were 10 meters long, how much time elapses while you take a full swing from side to side and back while calling for help? 6. What fundamental constants of nature that we cannot predict from first principles determine the behavior we are discussing and its outcome