Recent content by phyRob

The formation of a star produces a local decrease in entropy, but the entropy of the universe increases.

Air density decreases as you go up, so there is less drag at higher altitudes.

Compared to the mass of the truck, the amount of mass removed by using helium would be extremely small. You could do a rough calculation of how much the air weighs in the trunk and backseat area. Specific weight of air at 70F is about 0.075 lb/cuft.

Your truck will be lighter and as a result will have less traction. I doubt that you could fit a significant amount of gas into the panels to make a big difference. Plus the bladders will add weight( offsetting the reduction from the gas) to the truck - you're probably thinking of something like...

I can't quite visualize this. I don't see where the low pressure is. You still need a tower for the parachute, and a plastic tube and a fragile parachute which will need to be repaired. The tube needs to be fairly large because the turbine won't spin unless there is a lot of air moving...