- #1

Pythagorean

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theta and phi are both time-dependant. How do I take the time derivative of this function? Is there a general notation or do I have to assume theta = w1t and phi = w2t and go with that?

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- Thread starter Pythagorean
- Start date

- #1

Pythagorean

Gold Member

- 4,214

- 272

theta and phi are both time-dependant. How do I take the time derivative of this function? Is there a general notation or do I have to assume theta = w1t and phi = w2t and go with that?

- #2

Mute

Homework Helper

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[tex]\frac{d}{dt}f(\theta,\phi) = \frac{\partial f}{\partial \theta}\frac{d \theta}{dt} + \frac{\partial f}{\partial \phi}\frac{d \phi}{dt}[/tex]

Of course, you do then need to know the time derivatives of theta and phi. (Note that this also assumes theta and phi are functions of time only).

- #3

Pythagorean

Gold Member

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- 272

ah, thank you much, that's exactly what I was looking for.

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