Question Number 16055 by Tinkutara last updated on 17/Jun/17 $$\mathrm{Let}\:{A}',\:{B}'\:\mathrm{and}\:{C}'\:\mathrm{be}\:\mathrm{the}\:\mathrm{midpoints}\:\mathrm{of} \\ $$$$\mathrm{the}\:\mathrm{sides}\:{BC},\:{CA}\:\mathrm{and}\:{AB}\:\mathrm{of}\:\mathrm{the} \\ $$$$\mathrm{triangle}\:{ABC}.\:\mathrm{Prove}\:\mathrm{that} \\ $$$$\overset{\rightarrow} {{AA}'}\:=\:\frac{\mathrm{1}}{\mathrm{2}}\left(\overset{\rightarrow} {{AB}}\:+\:\overset{\rightarrow} {{AC}}\right) \\ $$ Answered by mrW1 last…
Question Number 81498 by jagoll last updated on 13/Feb/20 $$\mathrm{what}\:\mathrm{the}\:\mathrm{formula} \\ $$$$\bar {\mathrm{a}}\:×\:\left(\bar {\mathrm{b}}×\bar {\mathrm{c}}\right)\:? \\ $$ Answered by TANMAY PANACEA last updated on 13/Feb/20…
Question Number 81295 by jagoll last updated on 11/Feb/20 $${what}\:{is}\:{vector}\:{unit}\:{orthogonal} \\ $$$${to}\:\left(\mathrm{1},\mathrm{2},−\mathrm{2}\right)\:{and}\:{parallel}\:{to}\: \\ $$$${yz}−{plane}? \\ $$ Commented by john santu last updated on 11/Feb/20 $${say}\:{this}\:{vector}\:\bar…
Question Number 81104 by jagoll last updated on 09/Feb/20 $$\left(\bar {{a}}\:×\bar {{b}}\:\right).\bar {{c}}\:=\:\left({a}×{c}\right)\:.\:\left({b}×{c}\right).\:{it}\:{right}? \\ $$ Commented by mr W last updated on 09/Feb/20 $${yes}.\:{an}\:{example}\:{for}\:{its}\:{application} \\…
Question Number 81007 by M±th+et£s last updated on 08/Feb/20 $${if}\:\:\:{t}_{{m}} +{t}_{{n}} \:{and}\:{t}_{{m}} −{t}_{{n}} \:{is}\:{triangular} \\ $$$${number}\:{find}\:{the}\:{value}\:{of}\:{m}+{n} \\ $$ Commented by MJS last updated on 08/Feb/20…
Question Number 15448 by Tinkutara last updated on 10/Jun/17 $$\mathrm{A}\:\mathrm{vector}\:\overset{\rightarrow} {{A}}\:\mathrm{of}\:\mathrm{magnitude}\:{A}\:\mathrm{is}\:\mathrm{turned} \\ $$$$\mathrm{through}\:\mathrm{an}\:\mathrm{angle}\:\theta.\:\mathrm{Calculate}\:\mathrm{the} \\ $$$$\mathrm{change}\:\mathrm{in}\:\mathrm{the}\:\mathrm{magnitude}\:\mathrm{of}\:\mathrm{vector}. \\ $$ Commented by prakash jain last updated on 10/Jun/17…
Question Number 146472 by nadovic last updated on 13/Jul/21 Commented by nadovic last updated on 13/Jul/21 $${OK} \\ $$ Terms of Service Privacy Policy Contact:…
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Question Number 15358 by Tinkutara last updated on 09/Jun/17 $$\mathrm{If}\:\overset{\rightarrow} {{a}},\:\overset{\rightarrow} {{b}},\:\overset{\rightarrow} {{c}}\:\mathrm{are}\:\mathrm{mutually}\:\mathrm{perpendicular} \\ $$$$\mathrm{vectors}\:\mathrm{of}\:\mathrm{equal}\:\mathrm{magnitudes},\:\mathrm{show}\:\mathrm{that} \\ $$$$\mathrm{the}\:\mathrm{vector}\:\overset{\rightarrow} {{a}}\:+\:\overset{\rightarrow} {{b}}\:+\:\overset{\rightarrow} {{c}}\:\mathrm{is}\:\mathrm{equally}\:\mathrm{inclined} \\ $$$$\mathrm{to}\:\overset{\rightarrow} {{a}},\:\overset{\rightarrow} {{b}}\:\mathrm{and}\:\overset{\rightarrow} {{c}}\:.…
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