- #1
Wardub
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Trying to teach myself physics and I've run into a problem I don't quite understand.
"The magnitude of dA/dt can be found by the following geometrical argument. The change of A in the time interval t to Δt is"
ΔA = A(t + Δt) - A(t)
And then somehow it gets to
|ΔA| = 2Asin(Δ[itex]\theta[/itex]/2)
I just can't see how those are equal. Especially where theta/2 comes in.
This comes out of Kleppner pages 25 and 26, if that helps. Supposedly there's a sketch, but I can't see one.
"The magnitude of dA/dt can be found by the following geometrical argument. The change of A in the time interval t to Δt is"
ΔA = A(t + Δt) - A(t)
And then somehow it gets to
|ΔA| = 2Asin(Δ[itex]\theta[/itex]/2)
I just can't see how those are equal. Especially where theta/2 comes in.
This comes out of Kleppner pages 25 and 26, if that helps. Supposedly there's a sketch, but I can't see one.