When opening a hinged door, the handle is usually on the side of the door farthest from the hinges. rank the difficulty of opening the door if you were to push or pull on the following locations on the door:

hardest to open

easiest open

1. as close to the hinges as possible

2. the center of the door

3. the edge farthest from the hinges

The order of difficulty from the hardest to the easiest would be subject to the concept we have of Torque.

The Torque principle defines us that

Where,

F = Force

d = Distance

As the distance increases, the force applied must be less to make the movement of the object so we have to

Hence we have to be the distance inversely proportional to the force to turn the door the order would be:

As close to the hinges as possible (Hardest)> The center of the door> the edge farthest from the hinges (Easies)

1>2>3

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me