An automobile engine slows down from 4200rpm to 1500rpm in 2.9s .
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An automobile engine slows down from 4200rpm to 1500rpm in 2.9s .

[From: ] [author: ] [Date: 12-04-16] [Hit: ]
w2 = 1500*2π/60 = 157.α = dw/dt = -97.Θ = d(w²)/(2α) = (157.1² - 439.8²)/(2*α) = 865.3 rad = 137.......
a=-97 rad/s^2
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
1
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