A circular platform rotates around a vertical axis with angular velocity $ω = 10 rad / s$ . On the platform is a ball of mass 1 kg, attached to the long axis of the platform by a thin rod of length 10 cm ( $α = 3 0^{\circ}$ ). Find normal force exerted by the ball on the platform (in newton). Friction is absent.

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diagram

TestHub · Accepted Answer

r = 0.1 cos 3 0 ∘ = 0.0866 m ; radial: T cos 3 0 ∘ = m ω 2 r = 8.66 ⇒ T = 10 N . Vertical: T sin 3 0 ∘ + N = m g ⇒ N = 10 − 5 = 5 N .

Physics - Circular Motion Question with Solution | TestHub

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