How man significant figures does the following value gave 43.023

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

The amount of potential energy possessed by an elevated object is equal to what?

It takes a lot of energy to get the temperature of water to increase and eventually boil because water has a high heat.