A block and tackle system is used to lift of 20N through a vertical height of 10M .If the efficiency of the system is 40N how much work is done against friction ​

object 2 because all the other ones are wrong

gas and liquid

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 =