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ALL PHYSICS DOUBTS - POST HERE !!

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haris94:

--- Quote from: igext on May 25, 2010, 07:44:17 pm ---my teacher said the current is directly induced in the 2ndry coil with out the help of the core

--- End quote ---

thats not true

CatAly$t:
does anybody have a list of formulas for physics??

and any tips....

the_grim_reaper:

--- Quote from: Shazizzzle on May 25, 2010, 07:54:02 pm ---The half-life is 5 hours. That means it takes 5 hours for half the sample to decay.

They are asking about 20 hours before.
After the 20 hours, it was 0.48 g.
How much was it 5 hours before? It would be double, as 5 hours is the half life.
So, 0.48 X 2= 0.96.
0.96 was 5 hours before.
What about ten hours before the initial?
That would be double of the 5 hours before one. i.e 0.96 X 2 = 1.92.

So, 10 hours ago, it was 1.92.



Shaz don't get mad but the answer is 7.68 g :D
What about 15 hours before? That would be 5 more behind the 10 hours one.
So, 1.92 X 2 = 3.84

And thus for 20, 1.92 X 2 = 3.84

See, in every 5 hours, it doubles.
You can't just multiply 0.48 by 4.
It DOUBLES every 5 HOURS.
So, you have to double it, in each step, when going backwards.

--- End quote ---

Shaz don't get mad but it's 7.68 g :D.

Malak:
Do we need to know the logic gates stuff for ppr 1?

igext:

--- Quote from: haris94 on May 25, 2010, 07:54:24 pm ---thats not true

--- End quote ---
aryt... so if they ask about the function of the core worth 2 marks wat will u write down?

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