The 8.7-kg wheel with a radius of gyration of 200 mm about its center O is released from rest on the incline. If the wheel rolls without slipping, what is the minimum coefficient of friction μs?

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr

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 =