2points
which of the following could be vector magnitudes?
a. 30 m/s
b. 15 hours
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c. 25 milliliters
d. 15 kilometers
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A. 30 m/s

D. 15 kilometers

Explanation:

Vector quantities have both magnitude and direction. Among the provided choices, B and C are scalar quantities as they have no direction.

30 m/s is the magnitude for velocity, a derivative of displacement.

15 kilometers is the metric magnitude (10³m) for displacement.

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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 =