Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Snake:
--- Quote from: Raywin on May 25, 2010, 03:25:31 pm ---Thanks a lot!! :D and another thing wht is the relationship between the resistance of a wire and its length and diameter?
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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?
guMnam:
--- Quote from: Ivo on May 25, 2010, 04:08:21 pm ---Then if V=IR, so re-arrange I=V/R, so V is constant, so if you increase the resistance, then you decrease the current.
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so mainly it depends on the equatin..there is no rule??...
Ivo:
--- Quote from: 8T on May 25, 2010, 04:11:06 pm ---Could someone spare his time & explain total internal reflection for me?
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TIR happens when angle of incidence (IN OPTICALLY DENSER material) is more than critical angle.
jellybeans:
--- Quote from: ang3l on May 25, 2010, 04:09:59 pm ---How do u calculate the answer...
thx
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5 hours is 1/4 of 20 hours.
you need to find what is WAS .. so you repeat (0.48*2) for 4 times. this is cuz it was halved for 4 times to reach 0.48, so to find what is was before, you times 2 by 4 times.. eek, geddit? >_<
0.48*2*2*2*2 = 7.68g :)
Ghost Of Highbury:
--- Quote from: ang3l on May 25, 2010, 04:09:59 pm ---How do u calculate the answer...
thx
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0.48*2*2*2*2 = 7.68
7.68 after 5 hours = 3.84
after 10 hours = 1.92
after 15 hours = 0.96
after 20 hours = 0.48
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