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Physics - Circular Motion Question with Solution | TestHub

PhysicsCircular MotionMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

When a ceiling fan is switched on, it makes $10$ rotations in the first $4 s$ . Assuming uniform angular acceleration, the number of rotations it will make in the next $4 s$ is

Options:

Answer:

Solution:

$θ = 2 π n = ω_{0} t + \frac{1}{2} α t^{2}$

$2 π \times 10 = \frac{1}{2} α 4^{2}$ or $α = \frac{40 π}{16}$

Let it make $N$ rotations in the first $8 s$

Then, $2 π N = \frac{1}{2} α 8^{2}$

or $N = \frac{1}{2 π} \times \frac{64}{2} \times \frac{40 π}{16} = 40$

$∴$ The required number of rotations

$= 40 - 10 = 30$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Circular MotionSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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