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A soft synthetic rubber ball of radius 9 cm is submerged to 7.5 m beneath the surface of a lake.

a) If the bulk modulus of the rubber compound is Brubber = 9 x106Pa , what is the diameter of the ball at that depth?

(b) A similar ball of equal radius, but made of thin rubber inflated with air, is also submerged to the same depth. The bulk modulus of air is Bair = 1.2 x105Pa . What is the radius of this ball at that depth? (Ignore any effects of temperature.)

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