maximum thrust is obtained.
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Angle of repose is equal to angle of friction.
The purpose of measuring taper angle is to obtain taper angle
a right angle is half of a straight angle
The relation between the arc of length and the central angle is that the arc of length divided by one of the sides is the central angle in radians. If the arc is a full circle, then the central angle is 2pi radians or 360 degrees.
Propellers of a boat or an aeroplane are literally a continuous inclined planes on an axle. Screws could also be described as an inclined plane on an axle. The work being done, however, is quite different: propellers push or pull a fluid - air or water. As with simple inclined planes, the incline angle is proportional - the greater the slope, generally speaking, the greater the force required to move it through the fluid. Meaning that the propeller is shaped in the form of a Wing which produces lift when it moves through the air. They are not considered a flat plane. However, some wings can be a flat plate design and produce lift.