Question

Please give answer as early as possible​

Answer 1

Explanation:

More explanation to your third question:

n0 = 90rpm 1.5rps

∴ ω = 2pi n0 = 3pi rad/s

The angle through which the blades of the fan move while

the blades of the fan move while stopping is theta = 2piN = 2pi(21) = 42 pi rad, ω = 0 (fan stops).

Using eyuations analoguos to kinematical equations of motion

α = ω - ω0/t = ω^2 - ω0^2/2theta

∴0-3pi/t = 0-(3pi)^2/2(42pi)

∴t = 28s.

Done with the answer.

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