In North India people observe a celebrated festival known as Holi. There we spray our friends with colored dyes using a device known as a "Pichkari". Assume that you are holding a horizontal pichkari

Question

In North India people observe a celebrated festival known as Holi. There we spray our friends with colored dyes using a device known as a "Pichkari". Assume that you are holding a horizontal pichkari whose one side is fitted with piston of area A. The other side has a cone fitted in the pichkari. The cone has a narrow opening of area a . The pistion is moving with speed v 0 ​ : ( a ≪ A )

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Continuity: A v 0 ​ = a v ⇒ v = a A v 0 ​ ​ - (A) correct Bernoulli between piston and opening: ρ g F / A ​ + ρ g p 0 ​ ​ = ρ g p 0 ​ ​ + 2 g v 2 ​ F = 2 1 ​ ρ A v 2 - (B) correct, (C) and (D) incorrect

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