Give atleast five important first aid materials and give the uses or the function of it.

Which of the following correctly describes the early view of catastrophism?

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?

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.