A piston-cylinder assembly contains a two-phase liquid-vapor mixture of H2O at 200 lbf/in.2 with a quality of 80%. The mixture is heated and expands at constant pressure until a final temperature of 480o F is reached. Determine the work for the process, in Btu per lb of H2O present. thermodynamics

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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 =

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.