How can a scuba diver keep from floating back to the surface of the water?

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Solution

By adding weights.

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Scuba divers carry cylinders with them.

A submerged scuba diver hears the sound of a boat horn directly above her on the surface of the lake. At the same time, a friend on dry land 22.0 m from the boat also hears the horn (fig). The horn is 1.2 m above the surface of the water. What is the distance (labeled by "?” in fig) from the horn to the diver? Both air and water are at 20 $^{\circ}$ C.

$B_{w a t e r} = 2.2 \times 109 P a, γ_{a i r} = 1.4, M_{a i r} \approx 30 g$

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Q. Rahul mixed chalk powder in water, but it was floating on the surface. Now he wants to get it back. Which of the following methods can he use?

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