Does this mean Acceleration???

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

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?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant