Category: Mechanics

Question Number 109268 by mr W last updated on 22/Aug/20 Commented by mr W last updated on 22/Aug/20 $${block}\:{m}\:{is}\:{released}\:{at}\:{height}\:{h}. \\ $$$${find}\:{the}\:{time}\:{it}\:{needs}\:{to}\:{reach}\:{the} \\ $$$${ground}. \\ $$$${all}\:{motion}\:{is}\:{frictionless}.…

Question Number 109207 by aurpeyz last updated on 21/Aug/20 $$ \\ $$$$\mathrm{A}\:\mathrm{50g}\:\mathrm{golf}\:\mathrm{ball}\:\mathrm{is}\:\mathrm{struck}\:\mathrm{with}\:\mathrm{a}\:\mathrm{club}\:\mathrm{moving} \\ $$$$\mathrm{wit}\:\mathrm{a}\:\mathrm{velocity}\:\mathrm{of}\:\mathrm{22m}/\mathrm{s}\:\mathrm{after}\:\mathrm{it}\:\mathrm{moves}\:\mathrm{4cm}\:\mathrm{anda} \\ $$$$\mathrm{b}{a}\mathrm{ll}\:\mathrm{accelerates}\:\mathrm{with}\:\mathrm{a}\:\mathrm{velocity}\:\mathrm{of}\:\mathrm{44m}/\mathrm{s}\: \\ $$$$\mathrm{estimate}\:\mathrm{the}\:\mathrm{average}\:\mathrm{force}\:\mathrm{exerted}\:\mathrm{by}\:\mathrm{the}\:\mathrm{clubn} \\ $$$$\mathrm{o}{n}\:\mathrm{the}\:\mathrm{ball} \\ $$ Answered by aurpeyz…

Question Number 174728 by ajfour last updated on 09/Aug/22 Commented by ajfour last updated on 09/Aug/22 $${If}\:{rod}\:{is}\:{released}\:{as}\:{shown}\:{and} \\ $$$${rod}\:{rolls}\:{over}\:{the}\:{fixed}\:{semi}- \\ $$$${cylinder}\:{how}\:{long}\:{does}\:{it}\:{take}\:{for} \\ $$$$\:{end}\:{B}\:{to}\:{strike}\:{the}\:{ground},\:{the}\: \\ $$$${other}\:{side}?…

Question Number 109167 by Dwaipayan Shikari last updated on 21/Aug/20 Answered by mr W last updated on 21/Aug/20 $${ball}: \\ $$$${before}\:{collision}\:{v}_{{i}} =\sqrt{\mathrm{2}{gl}} \\ $$$${after}\:{collision}\:{v}_{{f}} =\sqrt{\mathrm{2}{gl}\left(\mathrm{1}−\mathrm{cos}\:\theta\right)}…

Question Number 108922 by ajfour last updated on 20/Aug/20 Commented by ajfour last updated on 20/Aug/20 $$\:\:\:\:\:\:\:{Neglect}\:{friction}.\:{Find} \\ $$$$\:\:\:\:\:{initial}\:{acceleration}\:{of}\:{M}. \\ $$ Answered by mr W…