Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Ivo:
--- Quote from: guMnam on May 25, 2010, 04:12:24 pm ---so mainly it depends on the equatin..there is no rule??...
--- End quote ---
Yep, kind of.
holtadit:
--- Quote from: ang3l on May 25, 2010, 04:09:59 pm ---How do u calculate the answer...
thx
--- End quote ---
Okay.....
There a FOUR half lives involved in this each FIVE hours long = 20 hours altogether.
Okay, if you knew the ORIGINAL mass (lets say Xg) at the START what would you have done ? X/2= something which you would have divided by 2 and so on.
For this you need to wrk backwards.
0.48*2= 0.96
0.96*2= 1.92
1.92*2= 3.84
3.84*2= 7.68 g
Ghost Of Highbury:
--- Quote from: diva_sparkles on May 25, 2010, 04:08:49 pm ---it can also be H=I^2R
H is heat in this case
--- End quote ---
High voltage direct current (HVDC) is used to transmit large amounts of power over long distances
P = V*I
P is constant, thus, a large value of voltage is used to reduce the current.
H = I^2r
I reduces, H reduces. Thus the heat loss is reduced.
Raywin:
--- Quote from: Snake on May 25, 2010, 04:11:25 pm ---Length - If length increases (lets say by x2) then the resistance increases by x2 because it takes 2 times the amount of time for the current to travel! (Increase in length=Increase in Resistance)
Crossectional area (diameter) - If the area decreases then resistance increases, however if area increases then resistance decreases ( Decrease in area=Increase in Resistance)
Hope I helped elaborate a bit more :)
Guys I have a doubt, what is a Capacitor? and its properties?
--- End quote ---
THANKS A LOT! YES U DID.. ;D AND A capacitor is something tht looks like this || on a circuit. Wht it does is when connected to a circuit with a switch closed, it charges. Charge is stored in it. When the switch is open, it lets these charges out AFTER a delay and it discharges.
holtadit:
This is like a private study period. :P
LMAO !
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version