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QAIPM-2012-Ph-1750: NEET 2012 Physics - Class 12 AIPM-2012-Ph-1750 Solution: ABC is an equilateral triangle with O as its centre. \( {F}_1…
ABC is an equilateral triangle with O as its centre. and represent three forces acting along the sides AB BC and AC respectively. If the total torque about O is zero then magnitude of is
Multiple Choice Options
- A 60 s
- B 80 s
- C 20 s
- D 40 s
Step-by-Step Verified Solution
Let, the amount of the two in the mixture
will become equal after t years.
The amount of A 1 , which remains after t years
N 1 = N 01 ( 2 ) t / 20
The amount of A 2 , which remains, after t years
N 2 = N 02 ( 2 ) t / 10
According to the question
N 1 = N 2
_ 40 ( 2 ) t / 20 = 160 ( 2 ) t / 10
_ ( 2 ) t / 20 = ( 2 ) ( t 10 _ 2 )
_ t 20 = ( t 10 _ 2 )
_ t = 40 s