Akkadian and hittite panache was so great the massive palaces sacred structures and protective gates they built had heavy doors that operated with load bearing metal hinges.
Second hinge of the door.
If each hinge supports half the weight of the door find the magnitude and direction of the horizontal components of the forces exerted by the two hinges on the door.
If your left hand is nearer the doorknob then it is a left handed hinge and door.
However it is seen on interior doors from time to time.
If your right hand is nearer the doorknob then it is a right handed hinge and door.
A wheelbarrow is also a second class lever.
Hinges have been found in ancient societies in africa asia europe and elsewhere.
A uniform 26 kg door that is 2 5 m high by 0 80 m wide is hung from two hinges that are 20 cm from the top and 20 cm from the bottom.
Most of these very early hinges are bronze door hinges.
This hinge is not as common as some of the other types.
A door belongs to the second class of levers because its pivot hinge is at the end the load weight of the door is at the center while the effort opening the door is applied at the other end.
Metal was expensive and labor.
The pivot allows the door to be opened at a 90 degree angle.