Hey, Russ! Just wanted to say I'm really pleased with your explanation of why pressure increases when you place your thumb over a hose, here:
I'm a graduate student and a fellow TA for a physics class wanted to use this basic problem as a quiz problem. I warned him against it, telling him that the physics is deceptively complicated. When I did a Google search for "hose thumb physics", yours was the first correct explanation of the phenomenon (even though it was halfway down the page!).
I wish the correct explanation (and not the continuity equation) were more prevalent on the internet.
Hi, I would like to ask for your opinion..
If I were to design a rear bumper for truck or trailer, which the most focus is to absorb energy during car crash on it, what aspect should i consider for the most optimized design? What material is best used for the design?
Hi Guys, it's my first post and I'm sorry if this is not the most appropiate room to place my question... maybe you can re-address me. Anyway, the fact is that I've been thinking recently about the possibility to build a self-rotating magnetic motor. I've found the internet (as usual) full of informations, from the drawings and pictures of the first U.S. patented pemanent magnetic motor by Howard Johnson in 1973, to several claims of magnetic motor capable to supply electric power at no cost. Now, I've been "playing" with magnets at some instances in my life for different reasons and I have the "feeling" that such a motor could really work. But leaving feelings aside I wonder how this could be admitted by any law of conservation of energy. In other words: any single permanent magnet is able to produce work losing its power along with time quite slowly... please explain to me how does this fit with the law of conservation of energy.
Hi, Russ. I live in an small old house in Dover Delaware (1000 sq ft). I cool my house with a Kenmore 21,000 BTU window air conditioner mounted in a wall. The other side of the wall is my porch. It is about 14' x 16' and has two sides that are the house and two exposed sides that are all glass with 4 sliding glass doors. In the summer I open the four sliding glass doors and turn on the ceiling fan before turning on the a/c. I have been using it like this for over 30 years. In the cooler days of the year we keep the doors closed. Today it is 41 degrees F out side and 56 degrees F on the porch. One side of the porch is facing the south and the other is facing west. temperature gets up to 85 degrees F. How do you think it would work to use change window air conditioner to heat pump?
i'm doing final year aeronautical engineering. i would like to do ion propulsion system for my final year project. i need a help from u to do this project. please give ur suggestion about my decision.