Under normal circumstances, the vitreous humor, a jelly-like substance in the main part of the eye, exerts a pressure of

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Under normal circumstances, the vitreous humor, a jelly-like
substance in the main part of the eye, exerts a pressure of up to
24 mm of mercury that maintains the shape of the eye.
a) If blockage of the drainage duct for aqueous humor
causes this pressure to increase to about 50 mm of
mercury, the condition is called glaucoma. What
is the increase in the total force (in newtons)
on the walls of the eye if the pressure increases from
24 mm to 50 mm of mercury? We can quite
accurately model the eye as a sphere 2.7 cm in
diameter.
Express your answer in newtons.