Recent content by OwenMc

As a pilot myself (little planes, no way I'd make it to 700km/h!) I do these sort of calculations in my sleep! You're both right, depending how you define the wind. The standard definition is the bearing the wind blows FROM. If you use this you get lamerali's answers. Use the incorrect approach...

Thats the same as the answer I got, except for the minus sign. You know the harmonic force is acting in the -ve sense (trying to slow the plate down at the point of maximum acceleration), therefor the friction must be acting in the +ve sense (opposing the force from the plate). Because the...

I have a question regarding the behavior of photons, or anything for that matter, when treated as a wave. When I think of waves, I think of sound, sea, earthquakes, etc... and a common theme amongst these is a medium through which they propagate (air, water and rock). In this way I have no...

My mistake, too many years spent dealing with mass flow rates! Of course the volume flow rate will change with pipe length!

Having read the recent thread on gravity waves, I was intrigued by the question of speed. This question has always bothered me when thinking about gravity, although this is probably because I'm not much of a physicist! Firstly, the speed of gravity, as discussed in the previous thread. If the...

Surely, if the compressor is delivering a particular CFM (which may or may not be the 600 quoted), this is what you'll get out of the pipe? You will have changes in density and pressure, but the overall mass flow rate has to stay constant, no? Apologies if I've missed something!

Your thinking is along the right lines. If you stand in a lift that isn't moving, you experience gravity, that is an acceleration of g. If the lift goes up, you now experience an additional acceleration (in your case 2ms-^2 more), so you feel heavier. The opposite is true if you go down. When...

I would start this problem by thinking about the plate. You correctly said that before the object starts to move the friction force is equal to the force exerted by the plate. You also know 2 key facts about the plates motion, its time period and its amplitude. If you have a look at the...