A projectile is fired over horizontal ground from the origin with an initial speed of 60 m/s. What firing angles will produce a range of 250 m?

Angle θ ≅ 21.5°

Explanation:

Given:

speed Vi= 60 m/s, Range R= 250 m, g=9.81 m/s²

To find:

Angle θ = ?

Sol: we know that Rang R = Vi² sin 2θ / g

⇒ Sin 2θ = g×R / Vi²

Sin 2θ = (9.81 m/s² × 250 m) / ( 60 m/s)²

Sin 2θ = 0.68125

2θ = Sin ⁻¹ (0.68125)

2θ = 42.9413

θ = 42.9413 / 2

θ = 21.4706 ≅ 21.5°

ice to water 1 water to vapour 2 latent heat

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 =