The record time for a tour de france cyclist to ascend the 1100-m-high alpe d'huez is 37.5 min. the rider and his bike had a mass of 65 kg. at the average speed of the ride, the metabolic power to ride on level ground would be 700 w. to this, we must add the power to make the climb.

Answer

given,

height of Alpe d'Huez =  1100-m

time = 37.5 min

mass of the rider and his bike = 65 Kg

the metabolic power to ride = 700 W

U = m g y

U = 65 x 9.8 x 1100

U = 700700 J

since efficiency is 25%

b)

P = 1245.68 W

force tends to be low and long diustance masses are high

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 =