What is true for two pieces of iron at the same temperature? 1.Heat flows from the object with higher potential energy to the object with lower potential energy. 2.The average kinetic energy of their particles is the same. 3.Heat flows from the larger object to the smaller object. 4.The total kinetic energy of their particles is equal.

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

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 =