Suppose an eruptive prominence rises at a speed of 150 km/s. if it does not change speed, how far from the photosphere will it extend after 3 hours? how does this distance compare with the diameter of earth?

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?