1. ## Hot-air balloon question

Hey everyone,

I have a question that I just can't figure out. I'm not sure on how to set it up. Can anyone help me with it?

The question is:

You want to take a hot-air balloon ride on a summer day when the temperature is 25 degrees Celsius. To what temperature must you heat the air inside a 40-ft diameter balloon to lift two people(average weight 150lb) and the basket and balloon, which together weigh 100lb.

2. Originally Posted by ChemStudent
Hey everyone,

I have a question that I just can't figure out. I'm not sure on how to set it up. Can anyone help me with it?

The question is:

You want to take a hot-air balloon ride on a summer day when the temperature is 25 degrees Celsius. To what temperature must you heat the air inside a 40-ft diameter balloon to lift two people(average weight 150lb) and the basket and balloon, which together weigh 100lb.
You want the buoyant force to be equal to 100 lb. The buoyant force is equal to the weight of the air displaced by the balloon so....

-Dan