Unformatted text preview: a) What is the angular acceleration of the disk during the time interval between t = 0 and t = 2 s? Angular acceleration is given by the change in angular velocity divided by time interval. We take positive direction counterclockwise. The angular acceleration is α = Δω/Δt = (200  0)/(2  0) = 100 rad/s 2 b) What is the angular displacement during the time interval? We use the kinematic equation for angular displacement. We get Δθ = (1/2)αΔt 2 = 200 rad c) What is the magnitude of F 1 ? We apply Newton’s 2 nd law in angular form to the disk and solve it for the unknown force F 1 . Iα = F 2 R – F 1 R F ⇒ 1 = F 2 – Iα/R = 0.100 N, where I = (1/2)MR 2 = 1.00 × 104 kg m 2...
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 Fall '08
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 Physics, Mass, Work, Angular Acceleration, Velocity, Physical quantities, Tomoyuki Nakayama

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