Two students have volunteered to explore the galaxy in a spaceship .As they travel through space, they measure the magnitude of the gravitational force between their spaceship and the earth . They find that the gravitational force on the spaceship is

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

radiation

explanation:

heat is transmitted by radiation

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 =