Physics Question!!!?

A hard disk in your computer spins at 5400 rpm. If this disk turns through 12 revolutions before coming to a stop, find

a. the disk’s angular acceleration (rad/s2) and b. the time it takes to stop.

1 Answer

Relevance
  • NCS
    Lv 7
    1 month ago

    ω = 5400rev/min * 2π rads/rev * 1min/60s = 565 rad/s

    a. ω₀² = ω² + 2αΘ

    0² = (565rad/s)² + 2 * α * (12*2π rads)

    α = -2120 rad/s²

    and you might not need the sign in your answer.

    b. easiest is

    t = Θ / ω_avg = 12*2π rads / ½*565rad/s = 0.27 s

    but you could also use

    Θ = ω₀ + α*t

    since you know Θ, ω₀ and α

    If you find this helpful, please select Favorite Answer!

    • Commenter avatarLog in to reply to the answers
Still have questions? Get answers by asking now.