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**1. A uniform, thin solid door has a height 2.20 m, width 0.870m, and mass of 23.0 kg. Find its moment of inertia for rotation on its hinges. Is any piece of data unneccessary?**

2.

**A grinding wheel is in the form of a uniform solid disk of radius 7.00 cm and mass of 2 Kg. It starts from rest and accelerates uniformly under the action of the constant of torque of 0.6000 NxM that the motor exerts on the wheel.**

How long does it take for the wheel to reach its final operating speed of 1200 rev/min ? Through how many revolutions does it turn while accelerating?

How long does it take for the wheel to reach its final operating speed of 1200 rev/min ? Through how many revolutions does it turn while accelerating?

Would appreciate any help! Seems easy, but I can't figure it out..like the equation I need to use