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A compound has a fixed composition and is always a homogeneous pure substance.
focused strong, intensive, fixed, potent
change the direction of force
Yes
Yes, it is always C6H12O6
Yes
No, it is your choice.
That is not always true. Sometimes a fixed pulley is more useful.
A fixed pulley when used individually, uses more effort than the load to lift the load from the ground. This is what a fixed pulley always does. When attached to an unmovable object e.g. a ceiling or wall, it always acts as a first class lever where the fulcrum is located at the axis but with a minor change, the bar becomes a rope. The advantage of the fixed pulley is that you do not have to pull or push it up and down. The disadvantage is that you have to apply more effort than the load.
Aircraft and avionics mechanics have always fixed airplanes - nothing special happened in 1958 to change that.
solids always have a fixed shape because the particles in a solid are stuck together which means there is no where for the particle to move.
For a fixed perimeter, the area will always be the same, regardless of how you describe the rectangle.