Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
pglasg74:
--- Quote from: Ivo on May 25, 2010, 11:44:28 pm ---In shallow water, waves travel slowly. Look at the formula v=f(lambda-wavelength). So rearange: wavelength=v/f.
So, if v deceases, and frequency is the same, then wavelengh decresases. Therefore the lines in the diagram get shorter for shallow water. Opposite for deep water. Got it? ;D
--- End quote ---
hey can u explain winter 07 number 21 please?
+ rep 4 u :)
Ivo:
--- Quote from: pglasg74 on May 25, 2010, 11:48:18 pm ---hey can u explain winter 07 number 21 please?
+ rep 4 u :)
--- End quote ---
Still water surface basically means the middle. Between the peak and trough. So B, right? Think of it this way, the oscillations are perpendicular to wave direction, with maximum reachable amplitude is to the peak and through, and so the middle is the average between the two.
pglasg74:
--- Quote from: Ivo on May 25, 2010, 11:49:18 pm ---Still water surface basically means the middle. Between the peak and trough. So B, right? Think of it this way, the oscillations are perpendicular to wave direction, with maximum reachable amplitude is to the peak and through, and so the middle is the average between the two.
--- End quote ---
right, so smart lol :P, thanks 2 last questions please :)
39, winter 07... the answer's B, but didnt we always talk about decreasing resistance by increasing are (using thicker cables :S) why are we suddenly changing the concept now?
and also, for a fuse.. we always choose the rate next from the device? like if the hairdryer is 1.25 A, ill choose 2 not 3.. but if its 2.5 ill choose 3 not 4?
Ivo:
--- Quote from: pglasg74 on May 25, 2010, 11:57:42 pm ---
right, so smart lol :P, thanks 2 last questions please :)
39, winter 07... the answer's B, but didnt we always talk about decreasing resistance by increasing are (using thicker cables :S) why are we suddenly changing the concept now?
and also, for a fuse.. we always choose the rate next from the device? like if the hairdryer is 1.25 A, ill choose 2 not 3.. but if its 2.5 ill choose 3 not 4?
--- End quote ---
LOL, dunno q.39 isn't about it.
For fuses, yes you're correct. I'm not sure, but I think fuses generally only have ratings of 1A, 3A, 5A, and 15A; but that doesn't matter :P.
jellybeans:
HIIII!! :D :D
some explanation neeeeded please thankyouuuu!
;D
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