A sailor strikes the side of his ship just below the waterline. He hears the echo of the sound reflected from the ocean floor directly below 3.2 ss later. How deep is the ocean at this point? Assume the speed of sound in seawater is 1560 m/s and does not vary significantly with depth.

(75°f − 32) × 5/9 = 23.889°c

are there answer choices to this question? this seems like a question where you have options to choose from.

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =