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A massless string of length \(R\) is there. It starts doing a vertical motion.

If the length of the purple line is \(R \cos \theta \), that means the string's length is reduced, but where does it go?

Note by Saraswati Sharma
11 months, 2 weeks ago

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Length of the purpul line will remain R, why should it change to \(R \cos \theta\)?

Rohit Gupta - 11 months, 2 weeks ago

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I edited the note . We do vertical motion problem by ignoring Rsin(theta) , yeah I know Rsin(theta) is horizontal component and we are doing "vertical" motion . Calculation of h gives a strong feeling that the string becomes short .

Saraswati Sharma - 11 months, 2 weeks ago

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The length of the purple line is still R. The length of the red line above h is \(R \cos \theta \). The total length of the red line and purple line are equal to R.

Rohit Gupta - 11 months, 2 weeks ago

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