Lecture6-2A_000

# Lecture6-2A_000 - Today Today ’ ’ s Lecture s Lecture...

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Unformatted text preview: Today Today ’ ’ s Lecture s Lecture Motion in More Than One Motion in More Than One-- D D Circular Motion 2 Circular Motion 2 Newton Newton ’ ’ s Laws of Motion s Laws of Motion Circular Motion Circular Motion -- Spin Up The CD Spin Up The CD A 12.7cm diameter CD is spinning up with the rim undergoing a uniform tangential acceleration of Find the magnitude and direction of the acceleration for a point on the rim when a t 91.4 cm / s 2 . To find the radial acceleration we need the tangential velocity. t .341sec. This means that the radial acceleration is v a t t 91.4 .341 31.2 cm / s a r v 2 r 31.2 2 6.35 153.2 cm / s 2 Spin Up The CD Spin Up The CD A 12.7cm diameter CD is spinning up with the rim undergoing a uniform tangential acceleration of Find the magnitude and direction of the acceleration for a point on the rim after a t 91.4 cm / s 2 . t .341sec. The magnitude of the acceleration is The direction is easured from the tangent to the rim of the CD. a a r 2 a t 2 153.2 2 91.4 2 178 cm / s 2 tan − 1 153.2 91.4 1.033 rad 59.2 ∘ Spin Up The CD Spin Up The CD Given a uniform tangential acceleration...
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Lecture6-2A_000 - Today Today ’ ’ s Lecture s Lecture...

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