An electric motor exerts a constant torque 10N –m on a grind stone mounted on a shaft. NOI of the grind stone about the shaft is 2kg m 2 . If the system starts from rest find the work done in 8 s.
Text Solution
Verified by ExpertsThe correct answer is:
A
α α = 
= 5 rad/s 2 .
ω ω = ω ω 0 + α α t = 5(8) = 40 rad s -1
W = Δ Δ KE = 
I ω ω 2 – 0 = 
× 2 × (40) 2 = 1600 J
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