A0.18-kg turntable of radius 0.32 m spins about a vertical axis through its center. a constant rotational acceleration causes the turntable to accelerate from 0 to 24 revolutions per second in 8.0 s. calculate the rotational acceleration.

Angular acceleration will be

Explanation:

We have given that mass m = 0.18 kg

Radius r = 0.32 m

Initial angular velocity

And final angular velocity

Time is given as t = 8 sec

From equation of motion

We know that

So angular acceleration will be

the answer is b

explanation:

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 =