Helmet is designed to : A) keep drivers eyes on the road
B) provide cooling
C) stop head from being "thrown forward"
D) stop the head from continuing its forward motion when the car stops

measure their densities same density, same sub

dang that balls went far

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 =

gravitational energy

electrical energy

kinetic energy

ligh energy