Which property of a conducting wire is utilised in making electric fuse

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 built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?

Ais not a mixture. colloid compound suspension solution