# What is the difference between a linear velocity from a tangential velocity and radial velocity?

Linear velocity is the "real" velocity.

A far-off object's linear velocity cannot be measured, so we divide it into two parts: its tangential velocity (shift against the star background) and its radial velocity (measured by the Doppler effect, also known as red shift).

To put it briefly, tangential velocity is the speed across our field of vision, and longitudinal velocity is the speed moving in either direction.

These allow one to set up a vector-rectangle, the diagonal of which is the linear velocity.

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Radial velocity is the velocity component directed along the radius of a circular path, pointing toward or away from the circle center. Linear velocity is the velocity of an object in a straight line path. Tangential velocity is the velocity of an object moving along a curved path at any given point, perpendicular to the radial direction.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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