Question Number 24879 by Tinkutara last updated on 28/Nov/17
$$\mathrm{A}\:\mathrm{particle}\:\mathrm{of}\:\mathrm{mass}\:{m}\:\mathrm{is}\:\mathrm{fixed}\:\mathrm{to}\:\mathrm{one}\:\mathrm{end} \\ $$$$\mathrm{of}\:\mathrm{a}\:\mathrm{light}\:\mathrm{rigid}\:\mathrm{rod}\:\mathrm{of}\:\mathrm{length}\:{l}\:\mathrm{and}\:\mathrm{rotated} \\ $$$$\mathrm{in}\:\mathrm{a}\:\mathrm{vertical}\:\mathrm{circular}\:\mathrm{path}\:\mathrm{about}\:\mathrm{its} \\ $$$$\mathrm{other}\:\mathrm{end}.\:\mathrm{The}\:\mathrm{minimum}\:\mathrm{speed}\:\mathrm{of}\:\mathrm{the} \\ $$$$\mathrm{particle}\:\mathrm{at}\:\mathrm{its}\:\mathrm{highest}\:\mathrm{point}\:\mathrm{must}\:\mathrm{be} \\ $$
Commented by ajfour last updated on 28/Nov/17
$${zero}. \\ $$
Commented by Tinkutara last updated on 28/Nov/17
$$\mathrm{Why}\:\mathrm{not}\:\sqrt{{gl}}? \\ $$
Commented by prakash jain last updated on 28/Nov/17
$$\mathrm{Since}\:\mathrm{it}\:\mathrm{is}\:\mathrm{a}\:\mathrm{solid}\:\mathrm{rod}\:\mathrm{there}\:\mathrm{is}\:\mathrm{no} \\ $$$$\mathrm{requirement}\:\mathrm{for}\:\mathrm{tension}\:\mathrm{at}\:\mathrm{the} \\ $$$$\mathrm{highest}\:\mathrm{point}\:\mathrm{like}\:\mathrm{in}\:\mathrm{string}. \\ $$$$ \\ $$
Commented by Tinkutara last updated on 28/Nov/17
$$\mathrm{Thank}\:\mathrm{you}\:\mathrm{Sir}! \\ $$