No, it is not. If it were, the knee would be below the pedals (and under the road surface) at times!
When cycling forward in a straight line, the knee joint flexes and extends, rather than rotating about an axis. The rotation occurs at the hip joint, allowing the leg to move in a circular motion as the pedal is pushed downward.
rotating on a fixed point
Yes, the given coordinate is a straight line parallel to the x axis on the Cartesian plane.
Axis
That's called an axis of rotation, or simply an axis.
Acceleration
rotating on a fixed point
A straight line rotating about an axis through a point on the line, at a fixed acute angle.
rotating axis
Any object that rotates has a tendency to continue rotating.
Then the world would have no days or nights. We would just be either day or night depending on when the earth stopped rotating on it axis.
You generally plot a graph of Voltage v/s Current (with voltage on Y axis and current on the X axis). The graph will not be a straight line.
yes
does it cause day and night or seasons
the cause of earth rotating on it`s axis
It is rotating on its axis and orbiting the sun.
how much degree the earth ratates on its axis
No! it has a straight axis?