Refer to the given figures, (A, B and C) and arrange them in an order of first class lever, second class lever and third class lever.
A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever and calculate the effort needed.
A man uses a crowbar of length 2.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever used and calculate the effort needed.
Both a pair of scissors and a pair of pliers belong to the same class of levers. Name the class of lever.