The 20-kg roll of paper has a radius of gyration ka = 120 mm about an axis passing through point a. it is pin supported at both ends by two brackets ab. the roll rests on the floor, for which the coefficient of kinetic friction is μk = 0.2. if a horizontal force f = 60 n is applied to the end of the paper, determine the initial angular acceleration of the roll as the paper unrolls.

a 2,000 calorie based diet.

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 =