A dried pea is fired from a plastic drinking straw that has a mass of .50g. If the force exerted on the pea averages 0.4 N over the 0.10 s flight through the straw, (a) at what speed will the pea emerge? (b) what was the impulse imparted to the pea?

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 =