A boat makes a circle in a lake. The radius of the curve is 25 meters and the boat makes a complete circle every 125 seconds. What is the speed of the uniform circular motion? v = 2r / T

Uniform circular motion equations

An object executing uniform circular motion can be described with equations of motion. The position vector of the object is →r(t)=Acosωt^i+Asinωt^j, r → ( t ) = A cos ω t i ^ + A sin ω t j ^ , where A is the magnitude |→r(t)|, | r → ( t ) | , which is also the radius of the circle, and ω is the angular frequency.

Explanation:

Uniform circular motion equations

An object executing uniform circular motion can be described with equations of motion. The position vector of the object is →r(t)=Acosωt^i+Asinωt^j, r → ( t ) = A cos ω t i ^ + A sin ω t j ^ , where A is the magnitude |→r(t)|, | r → ( t ) | , which is also the radius of the circle, and ω is the angular frequency.

what is the actual question though?

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 =