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VikaD [51]
4 years ago
12

A bird can fly 25 km/h. How long does it take to fly 3.5km?

Physics
1 answer:
Evgen [1.6K]4 years ago
7 0
Speed of bird = 25km / h, it means a bird covers a distance of 25 km in 1 hour  or 60 minutes.
A birds covers a distance of 1 km in time = 1 hour  = 60 min
so, 60 / 25 = 2.4 = 2 minutes 4 second
it means a bird covers a distance of 1 km in 2 minutes 4 second, so a bird take time to fly 3.5 km in time = 3.5 x 2.4 = 8.4 = 8 minutes 4 second
So, the answer is 8 minutes 4 seconds.
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Answer:

(A) the angular acceleration of the blades is 13.33 m/s.

Explanation:

Given;

moment of inertia of a blade, I = 0.2 kgm²

net torque exerted on fan blades, ∑τ =  8Nm

Torque is given as product of moment of inertia and angular acceleration;

τ = Iα

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α is the angular acceleration

Since there are three blades of the ceiling fan, the net torque is given as;

∑τ = (3I)α

∑τ = 3Iα

α = ∑τ / 3I

α = (8) / (3 x 0.2)

α = 13.33 m/s

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