# Phy 231

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A CD-Rom starts from rest and undergoes uniform angular acceleration until it reaches 26,000 rpm in 0.25 s. Through what angle does it rotate during this time?

• Phy 231 -

f= 26,000 rpm=26000/3600=7.2 rev/s
2πf = εt
ε = 2πf/t =2π•7.2/0.25 =176 rad/s²

φ = εt²/2 = 176•(0.25)²/2 =5.5 rad

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