Suppose r'(t) has units of m/s. Explain why T(t) = r'(t)/ | r'(t) | is dimensionless (has no units) and carries information only about direction.

Calculus: Early Transcendentals
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ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
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Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Suppose r'(t) has units of m/s. Explain why T(t) = r'(t)/ | r'(t) | is dimensionless (has no units) and carries information only about direction.

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Suppose r'(t) has units of m/s.

To explain why Let r(t) be a differential vector valued functionNow we look for the derivative r'(t)The vector r'(t) points in the direction of travel and its length tells us the speed of travelNow we if we are interested in finding the direction of r' but not its length The standard unit tangent vector denoted by T(t) is given by:T(t)=r'(t)r'(t) is dimensionless (has no units) and carries information only about direction.

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