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### Question

#### Two hollow hemispheres of metal are fitted together to form a sphere of radius R. Air from the shall is pumped out and pressure remained left inside is th the outside atmospheric pressure P_{0}. The force required to separate the hemisphers is

#### The correct answer is:

#### Excess pressure exists outside

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= Buoyant force = weight

F = 20 N in down ward direction

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Force by liquid = Mg

But and

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If total force is minimum

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Velocity of efflux =

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