Same time
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Answer:
lentic zones because they do not move they are stagnant water examples are ponds, swap, dams.
The ship is at rest with reference to any point that's ON the ship.
It's in motion with reference to any point that's NOT on the ship
or glued to it.
-- The reference level for sound wave intensity is the threshold of human hearing, defined as 10⁻¹² W/m² .
-- This question is talking about a 90dB sound. So its intensity is 10⁻³ W/m² .
-- The question tells us the size of the area that this sound is hitting. So the power absorbed by that area is ...
Power = (intensity) x (area)
Power = (10⁻³ W/m²) x (5 x 10⁻⁵ m²)
Power = (10⁻³ x 5 x 10⁻⁵) W
<em>Power = 5 x 10⁻⁸ Watts</em>
(That's 5 x 10⁻⁸ Joules of energy per second.)