Recent content by HengHY

what kind of fluid?

Not sure. Maybe they are using ion propulsion. Propeller will be quite useless in empty space. They want to use buoyancy to climb up to 200,000 feet which is very high, which may require a very big air balloon! The airship floats high enough to escape Earth (very slowly), so i think the heat...

I have a friends who worked in retails for quite a few years before he became an electrical engineer in one of the big company. But the chances are rare.

I am trying to understand the physics of an exponential horn. I got most of my references online and according to the Horn Physics by Martin King, the volume velocity at the mouth is greater than the applied volume velocity at the throat (the horn is driven by a speaker/buzzer). This is what i...

What is the value for mass?