A circular disc with diameter of 11 cm rotates 280 rpm to 1400 rpm in 20 seconds. Then its slow down, α=-4.5rad/s2 in 8 seconds to angular velocity, ω1 rad/s. Determine
A. Angular acceleration and angular velocity ω1 rad/s
B. Total revolution been made
C. Centripetal acceleration and force at t= 15 seconds where mass is 75 g
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