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Introductory Physics Homework Help
Rotational Motion: Average angular acceleration of a CD
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[QUOTE="adangerousdriver, post: 6077458, member: 652781"] [h2]Homework Statement [/h2] "A compact disc (CD) stores music in a coded pattern of tiny pits 10−7m deep. The pits are arranged in a track that spirals outward toward the rim of the disc; the inner and outer radii of this spiral are 25.0 mm and 58.0 mm, respectively. As the disc spins inside a CD player, the track is scanned at a constant linear speed of 1.25 m/s." [I]"What is the average angular acceleration of a maximum-duration CD during its 74.0-min playing time? Take the direction of rotation of the disc to be positive."[/I] r[SUB]inside[/SUB]=.025m r[SUB]outside[/SUB]=.058m v=1.25m/s Calculated from previous parts of this problem: ω[SUB]inside[/SUB]=50rad/s ω[SUB]outside[/SUB]=21.6rad/s t=74min=74*60s [h2]Homework Equations[/h2] α=(ω[SUB]f[/SUB]-ω[SUB]i[/SUB])/(Δt) [h2]The Attempt at a Solution[/h2] I figured average angular acceleration would be calculated by subtracting the initial angular velocity from the final and dividing by the time interval, so I plugged in and performed this calculation: (21.6rad/s-50rad/s)/(74*60s-0s) to get -0.006 rad/s[SUP]2[/SUP]. This is online homework and it told me my answer is incorrect. I can't tell what I'm doing wrong. I've tried submitting both -0.006 and 0.006. [/QUOTE]
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Introductory Physics Homework Help
Rotational Motion: Average angular acceleration of a CD
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