Question Number 147149 by nadovic last updated on 18/Jul/21 $$\:\mathrm{Two}\:\mathrm{concurrent}\:\mathrm{forces}\:\boldsymbol{{F}}_{\mathrm{1}} \:=\:\mathrm{12N}\:\mathrm{and} \\ $$$$\:\boldsymbol{{F}}_{\mathrm{2}} \:=\:\mathrm{30N}\:\mathrm{are}\:\mathrm{150}°\:\mathrm{apart}.\:\mathrm{Calculate}\: \\ $$$$\:\mathrm{the}\:\mathrm{angle}\:\mathrm{between}\:\boldsymbol{{F}}_{\mathrm{2}} \:\mathrm{and}\:\mathrm{the}\:\mathrm{resultant} \\ $$$$\:\mathrm{force}. \\ $$ Answered by Olaf_Thorendsen last…
Question Number 147147 by nadovic last updated on 18/Jul/21 $$\:\mathrm{One}\:\mathrm{end}\:\mathrm{of}\:\mathrm{an}\:\mathrm{inextensible}\:\mathrm{string}\:\mathrm{is} \\ $$$$\:\mathrm{fixed}\:\mathrm{to}\:\mathrm{a}\:\mathrm{ceiling}\:\mathrm{and}\:\mathrm{the}\:\mathrm{other}\:\mathrm{end}\:\mathrm{is} \\ $$$$\:\mathrm{tied}\:\mathrm{to}\:\mathrm{a}\:\mathrm{wooden}\:\mathrm{block}.\:\mathrm{The}\:\mathrm{block}\:\mathrm{is} \\ $$$$\:\mathrm{pulled}\:\mathrm{aside}\:\mathrm{by}\:\mathrm{a}\:\mathrm{horizontal}\:\mathrm{force}\:\boldsymbol{{P}}, \\ $$$$\:\mathrm{such}\:\mathrm{that}\:\mathrm{the}\:\mathrm{string}\:\mathrm{now}\:\mathrm{makes}\:\mathrm{an} \\ $$$$\:\mathrm{angle}\:\mathrm{of}\:\mathrm{45}°\:\mathrm{with}\:\mathrm{the}\:\mathrm{downward}\: \\ $$$$\:\mathrm{vertical}.\:\mathrm{When}\:\mathrm{the}\:\mathrm{force}\:\boldsymbol{{P}}\:\:\mathrm{is}\:\mathrm{raised} \\ $$$$\:\mathrm{through}\:\mathrm{an}\:\mathrm{angle}\:\mathrm{of}\:\mathrm{30}°,\:\mathrm{it}\:\mathrm{decreases}\:\mathrm{by} \\…
Question Number 81562 by ajfour last updated on 14/Feb/20 Commented by ajfour last updated on 14/Feb/20 $${If}\:{pulled}\:{slightly}\:{more}, \\ $$$${hemisphere}\:{slips},\:{find}\:{tension} \\ $$$$\:{in}\:{shown}\:{equilibrium}\:{state}. \\ $$ Commented by…
Question Number 81011 by mr W last updated on 08/Feb/20 Commented by mr W last updated on 08/Feb/20 $${A}\:{ball}\:{with}\:{mass}\:{m}\:{and}\:{radius}\:{r}\:{falls} \\ $$$${from}\:{a}\:{height}\:{of}\:{h}\:{and}\:{hits}\:{two}\:{wedges} \\ $$$${with}\:{mass}\:{M}\:{for}\:{each}\:{as}\:{shown}. \\ $$$${If}\:{the}\:{coefficient}\:{of}\:{restitution}\:{is}\:{e}…
Question Number 80885 by ajfour last updated on 07/Feb/20 Commented by ajfour last updated on 07/Feb/20 $${cylinder}\:{against}\:{a}\:{wall}\:{and}\:{an} \\ $$$${incline}.\:{Find}\:{acceleration}\:\left(\rightarrow\right) \\ $$$${of}\:{the}\:{system}\:{such}\:{that}\:{both} \\ $$$$\:{normal}\:{reactions}\:{are}\:{equal}. \\ $$…
Question Number 146303 by ajfour last updated on 12/Jul/21 Commented by ajfour last updated on 12/Jul/21 $${If}\:{released}\:{as}\:{shown},\:{and} \\ $$$${assuming}\:{no}\:{friction},\:{find} \\ $$$${after}\:{what}\:{time}\:{does}\:{the}\: \\ $$$${upper}\:{ball}\:{hit}\:{the}\:{ground}? \\ $$…
Question Number 80648 by mr W last updated on 05/Feb/20 Commented by mr W last updated on 05/Feb/20 $${three}\:{thin}−{wall}\:{tubes}\:{with}\:{identical} \\ $$$${size}\:{and}\:{mass}\:{are}\:{released}\:{from}\:{the} \\ $$$${state}\:{as}\:{shown}. \\ $$$${find}\:{the}\:{time}\:{which}\:{the}\:{upper}\:{tube}…
Question Number 146026 by ajfour last updated on 10/Jul/21 Commented by ajfour last updated on 10/Jul/21 $${lets}\:{assume}\:{no}\:{friction}..{so} \\ $$$${slides}. \\ $$ Commented by ajfour last…
Question Number 145751 by ajfour last updated on 07/Jul/21 Commented by ajfour last updated on 07/Jul/21 $${Find}\:{the}\:{minimum}\:{energy}\:{that} \\ $$$${need}\:{be}\:{expended}\:{by}\:{pulling} \\ $$$${on}\:{one}\:{of}\:{the}\:{carpets}\:{with} \\ $$$${a}\:{force}\:\left({may}\:{vary}\right)\:{in}\:{the} \\ $$$${shown}\:{direction}\:{to}\:{detach}…
Question Number 80057 by ajfour last updated on 30/Jan/20 Commented by ajfour last updated on 30/Jan/20 $${If}\:{released}\:{as}\:{shown}\:{in}\:{upper} \\ $$$${diagram},\:{after}\:{what}\:{time}\:{does} \\ $$$${the}\:{upper}\:{sphere}\:{loose}\:{contact}, \\ $$$${with}\:{the}\:{lower}\:{ones}? \\ $$…