Atypical coal-fired power plant burns 350 metric tons of coal every hour to generate 2.6×106 mj of electricity. 1 metric ton = 1000 kg; 1 metric ton of coal has a volume of 1.5 m3. the heat of combustion is 28 mj/kg. assume that all heat is transferred from the fuel to the boiler and that all the work done in spinning the turbine is transformed into electrical energy. what is the power plant's thermal efficiency?

0.00095%

Explanation:

Mass of coal needed every day = Mass needed every hour × 24

Thermal energy released per hour = Mass × Heat of combustion

Power released per second = Energy / 3600 seconds

Thermal efficiency = (Electrical power / Mechanical power) × 100

Thermal efficiency of the plant is 0.00095%

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 =