Area of orifice is a. due to ejection of water of density p at a constant speed, the equilibrium compression in spring is x. the speed of ejection of water ( answer asap ! )

Thrust force due to ejection of water on the cart is counter balanced by spring force on the cart

so we can write

here we have

= rate of mass ejection

now from above formula

Now by force balance equation

by rearranging the terms now

the answer is b ) square root of 5

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 =