Variable Stars The variable star Zeta Gemini has a period of 10 days. The average brightness of the star is 3.8 magnitudes, and the maximum variation from the average is 0.2 magnitude. Assuming that the variation in brightness is simple harmonic, find an equation that gives the brightness of the star as a function of time.
To find: The equation for the brightness of the star as a function of time.
Answer to Problem 39E
The equation for the brightness of the star as a function of time is,
Explanation of Solution
Given:
The time period is
Formula used:
The general equations for displacement of objects in simple harmonic motion is,
Where,
Calculation:
Formula to calculate
As the maximum variation from the average is
Since the average brightness is
Assume that at
Substitute
Therefore, the brightness of the star as a function of time is,
Chapter 5 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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