Ahelicopter flies 250 km on a straight path in a direction 60° south of east. the east component of the helicopter’s displacement is km.

125km

Explanation:

the east component is given by the cosine function of the given angle.

because of the triangle that is formed between the east component end the south-east component

in this case the angle is:

the adyacent Leg is the east component

and the hypotenuse:

so:

we clear for the east component:

you can see the the triangle in the attached image, where the blue line is the east component

compass can be used day and night, cloudy or sunny

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 =