a=-97 rad/s^2
Calculate the total number of revolutions the engine makes in this time.
Calculate the total number of revolutions the engine makes in this time.
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w1 = 4200*2π/60 = 439.8 rad/sec
w2 = 1500*2π/60 = 157.1 rad/sec
α = dw/dt = -97.5 rad/sec²
Θ = d(w²)/(2α) = (157.1² - 439.8²)/(2*α) = 865.3 rad = 137.7 rev
w2 = 1500*2π/60 = 157.1 rad/sec
α = dw/dt = -97.5 rad/sec²
Θ = d(w²)/(2α) = (157.1² - 439.8²)/(2*α) = 865.3 rad = 137.7 rev