A man-made satellite orbits the earth in a circular orbit that has a radius of 21000 km. The mass of the earth is 5. 97e 24 kg. What is the tangential speed of the satellite?.

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 =