Official Answer
Answer
Kwishyiriraho intoki impeta zizunguruka (cyane cyane urukurikirane rwumucyo) udafite mandel ikwiye akenshi biganisha kuri 'kwaguka cyane'. Niba impeta ifunguye mugari kuruta ibikenewe kugirango isibe diameter ya shaft, fibre yo hanze igera mukarere ka disformasique. Ibisubizo muri 'set set', aho impeta ya diametre yubusa $ D_f $ yiyongera. Kubera iyo mpamvu, impeta ntizicara cyane mu nsi ya groove, biganisha ku iteraniro 'ridakabije'. Impeta irekuye irashobora kunyeganyega, igatera 'fretting' ya groove, kandi ikagira imipaka ntarengwa ya RPM kuko yamaze 'kwagurwa mbere' yerekeza aho izamuka.
