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Q. A diver 60 m deep in 10^circ {rm C} fresh water exhales a 1.5 {rm cm} diameter bubble. What is the bubble's diameter now as it reaches the surface of the lake, where water temperature is 20^circ {rm C}? Suppose that the air bubble is always in thermal equilibrium with the surrounding water.

Q. A 54 {rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.5 turns each second. The distance from one hand to other is 1.5 {rm m}. Biometric measurements indicate that each hand typically makes up about 1.25 % of body weight.

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