The flywheel of a stationary engine has a moment of inertia of 60kgm^2. What is the kinetic energy if its angular acceleration is 2 rads^-2

The kinetic energy of  flywheel of a stationary engine is 120J.

Explanation:

Key Terms:

Here , angular acceleration = 2

Angular velocity w =  Angular acceleration × time

∵ Acceleration is 2 rad per second sq. So , time is 1 sec.

⇒ Angular velocity (w) =

⇒ Angular velocity (w) =

Now, kinetic energy ⇒

⇒

⇒

⇒

∴ The kinetic energy of  flywheel of a stationary engine is 120J.

no. dot product   =0 when vecs at right angles

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