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autodidude
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Could someone please explain why PQ in the diagram below is rΔθ? Isn't rΔθ arc length?
The best reason I can think of is that it's only an approximation for when the angle is very small, so PQ≈arclength=rΔθ. Not 100% sure though.
http://imageshack.us/scaled/landing/199/feynmanangle.jpg
The diagram is from the first volume of the Feynman lectures in 18-3, in the section where he talks about rotation of rigid bodies.
The best reason I can think of is that it's only an approximation for when the angle is very small, so PQ≈arclength=rΔθ. Not 100% sure though.
http://imageshack.us/scaled/landing/199/feynmanangle.jpg
The diagram is from the first volume of the Feynman lectures in 18-3, in the section where he talks about rotation of rigid bodies.
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