1.

A coin is placedon a horizontal platform which undergoes vertical simple harmonic motion of angular frequency omega. The amplitude of oscillation is graduallyincreased. The coin will leave contact with platform for the first time :

Answer»

atthe mean POSITION of platform
for an amplitude`G//OMEGA^(2)`
for an amplitude of `g^(2)//omega^(2)`
at the highest position of the platform.

Solution :At extremeposition acceleration is MAXIMUM `a_("max")=r omega^(2)`. So the coin will leave the platform for thefirst time at extreme position only when amplitude is increased.
Thus CORRECT choice is (d).


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