Final answer:
Measuring the tilt of a machine head with a protractor is accurate, a vector can form a right angle triangle with its components, the Pythagorean theorem is used for the resultant of perpendicular vectors, and machine efficiency is always below 100% due to friction.
Step-by-step explanation:
Measuring the tilt of a head on a vertical machine accurately using a protractor is indeed true. In physics, this tool is commonly used for angular measurements, which can be critical for ensuring precision in machining and engineering tasks.
Regarding vectors, it is true that a vector can form the shape of a right angle triangle with its x and y components. This is often visualized in physics when breaking down a vector into its perpendicular components, a concept that's essential in understanding motion and forces.
It is also true that the Pythagorean theorem can be applied to calculate the length of the resultant vector when two vectors are at right angles to each other. This is a fundamental principle in vector addition, particularly in two-dimensional space.
Lastly, when considering the efficiency of a simple machine, it is true that it's always less than 100 percent due to the conversion of some input work to heat energy because of friction. This reflects the conservation of energy and real-world limitations of mechanical systems.