Question Number 75101 by Rio Michael last updated on 07/Dec/19 $${the}\:{vector}\:{equations}\:{of}\:{two}\:{lines}\:{L}_{\mathrm{1}} \:{and}\:{L}_{\mathrm{2}} \:{is}\:{given}\:{by} \\ $$$$\:{L}_{\mathrm{1}} :{r}=\:\boldsymbol{{i}}−\boldsymbol{{j}}+\mathrm{3}\boldsymbol{{k}}\:+\:\lambda\left(\boldsymbol{{i}}−\boldsymbol{{j}}\:+\boldsymbol{{k}}\right) \\ $$$${L}_{\mathrm{2}} \::\:{r}=\:\mathrm{2}\boldsymbol{{i}}+{a}\boldsymbol{{j}}\:+\:\mathrm{6}\boldsymbol{{k}}\:+\:\mu\left(\mathrm{2}\boldsymbol{{i}}\:+\:\boldsymbol{{j}}\:+\:\mathrm{3}\boldsymbol{{k}}\right) \\ $$$${where}\:{a},\lambda,\mu\:{are}\:{real}\:{constants}. \\ $$$${given}\:{that}\:{L}_{\mathrm{1}} \:{and}\:{L}_{\mathrm{2}} \:{intersect}\:{find}…
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Question Number 137627 by rs4089 last updated on 04/Apr/21 Answered by MrGaster last updated on 16/Feb/25 $$ \\ $$$$\mathrm{Prove}:\frac{{d}}{{dt}}\left[\overset{\rightarrow} {{u}}\frac{{d}\overset{\rightarrow} {{u}}}{{dt}}\right]=\overset{\rightarrow} {{u}}\frac{{d}^{\mathrm{2}} \overset{\rightarrow} {{u}}}{{dt}^{\mathrm{2}} }+\frac{{d}\overset{\rightarrow}…
Question Number 137559 by liberty last updated on 04/Apr/21 $$ \\ $$What is the volume of tetrahedron ABCD, whose vertices have the coordinates A (2,…
Question Number 5809 by Apoorva last updated on 28/May/16 Commented by Apoorva last updated on 28/May/16 $${please}\:{solve}\:{this}\:{limit} \\ $$ Answered by Yozzii last updated on…
Question Number 71198 by Rio Michael last updated on 13/Oct/19 $${A}\:{particle}\:{P}\:{is}\:{projected}\:{from}\:\:{a}\:{point}\:{O}\:{at}\:\:{the}\:{edge}\:{of}\:{a}\:{cliff}\:\mathrm{60}{m} \\ $$$${from}\:{the}\:{sea}\:{with}\:{a}\:{velocity}\:{of}\:\mathrm{30}{ms}^{−\mathrm{1}} .\:{When}\:{P}\:{is}\:{at}\:{a}\:{point}\:{B} \\ $$$${where}\:{OB}\:{is}\:{a}\:{horizontal},\:{another}\:{particle}\:{Qsuch}\:{that}\: \\ $$$${P}\:{and}\:{Q}\:{hit}\:{the}\:{sea}\:{simultaneously}\:{at}\:{thesame}\:{point}\:{A}.\:{Gven}\:{that}\:{they} \\ $$$${strike}\:{the}\:{sea}\:\mathrm{6}{seconds}\:{after}\:{P}\:{was}\:{fired}\bar {\:}\:{calculate} \\ $$$$\left.{a}\right)\:{the}\:{sine}\:{of}\:{the}\:{angle}\:{of}\:{elevation}\:{of}\:{projection}. \\ $$$$\left.{b}\right)\:{the}\:{distance}\:{from}\:{A}\:{to}\:{O}.…
Question Number 5466 by 3 last updated on 15/May/16 $$\sqrt{\mathrm{8}} \\ $$ Answered by FilupSmith last updated on 15/May/16 $$\sqrt{\mathrm{8}}=\sqrt{\mathrm{4}×\mathrm{2}} \\ $$$$=\sqrt{\mathrm{4}}\sqrt{\mathrm{2}} \\ $$$$\therefore\sqrt{\mathrm{8}}=\mathrm{2}\sqrt{\mathrm{2}} \\…
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Question Number 5452 by 3 last updated on 15/May/16 $$\mathrm{5}×\mathrm{6} \\ $$ Answered by FilupSmith last updated on 15/May/16 $$=\mathrm{5}×\mathrm{3}×\mathrm{2} \\ $$$$=\mathrm{15}×\mathrm{2} \\ $$$$=\mathrm{30} \\…