Three weights hang by very light wires as shown in the Figure. System moves up with vertical acceleration ay = 0.5 m/s2 . What is the tension in the B
wire? g = 9.8 m/s2

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 =