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Question-152672

Question Number 152672 by liberty last updated on 31/Aug/21 Answered by Dandelion last updated on 31/Aug/21 $$\mathrm{this}\:\mathrm{is}\:\mathrm{easy}\:\mathrm{Sir} \\ $$$$=\left(\mathrm{e}^{\mathrm{i}\pi/\mathrm{4}} \right)^{\mathrm{30}} =\mathrm{e}^{\mathrm{15i}\pi/\mathrm{2}} =\mathrm{e}^{\mathrm{i}\left(\mathrm{3}×\mathrm{2}\pi+\pi+\pi/\mathrm{2}\right)} =\mathrm{e}^{\mathrm{3i}\pi/\mathrm{2}} =−\mathrm{i} \\…

Question-21580

Question Number 21580 by ketto last updated on 28/Sep/17 Answered by Joel577 last updated on 29/Sep/17 $$\mathrm{Because}\:{A}\:\mathrm{and}\:{B}\:\mathrm{mutually}\:\mathrm{exclusive},\:\mathrm{then} \\ $$$${P}\:\left({A}\:\cap\:{B}\right)\:=\:\mathrm{0} \\ $$$$\mathrm{and} \\ $$$${P}\:\left({A}\:\cup\:{B}\right)\:=\:\mathrm{1} \\ $$$$…

A-block-of-mass-M-is-placed-on-smooth-ground-Its-upper-surface-is-smooth-and-vertical-surface-is-rough-with-coefficient-of-friction-A-block-of-mass-m-1-is-placed-on-its-horizontal-surface-and-tie

Question Number 21564 by Tinkutara last updated on 27/Sep/17 $$\mathrm{A}\:\mathrm{block}\:\mathrm{of}\:\mathrm{mass}\:{M}\:\mathrm{is}\:\mathrm{placed}\:\mathrm{on}\:\mathrm{smooth} \\ $$$$\mathrm{ground}.\:\mathrm{Its}\:\mathrm{upper}\:\mathrm{surface}\:\mathrm{is}\:\mathrm{smooth}\:\mathrm{and} \\ $$$$\mathrm{vertical}\:\mathrm{surface}\:\mathrm{is}\:\mathrm{rough}\:\mathrm{with}\:\mathrm{coefficient} \\ $$$$\mathrm{of}\:\mathrm{friction}\:\mu.\:\mathrm{A}\:\mathrm{block}\:\mathrm{of}\:\mathrm{mass}\:{m}_{\mathrm{1}} \:\mathrm{is}\:\mathrm{placed} \\ $$$$\mathrm{on}\:\mathrm{its}\:\mathrm{horizontal}\:\mathrm{surface}\:\mathrm{and}\:\mathrm{tied}\:\mathrm{with} \\ $$$$\mathrm{a}\:\mathrm{massless}\:\mathrm{inextensible}\:\mathrm{string}\:\mathrm{passing} \\ $$$$\mathrm{over}\:\mathrm{smooth}\:\mathrm{pulley}.\:\mathrm{Its}\:\mathrm{other}\:\mathrm{end}\:\mathrm{is} \\ $$$$\mathrm{connected}\:\mathrm{to}\:\mathrm{another}\:\mathrm{block}\:\mathrm{of}\:\mathrm{mass}\:{m}_{\mathrm{2}}…

A-man-of-mass-85-kg-stands-on-a-lift-of-mass-30-kg-When-he-pulls-on-the-rope-he-exerts-a-force-of-400-N-on-the-floor-of-the-lift-Calculate-acceleration-of-the-lift-Given-g-10-m-s-2-

Question Number 21557 by Tinkutara last updated on 27/Sep/17 $$\mathrm{A}\:\mathrm{man}\:\mathrm{of}\:\mathrm{mass}\:\mathrm{85}\:\mathrm{kg}\:\mathrm{stands}\:\mathrm{on}\:\mathrm{a}\:\mathrm{lift}\:\mathrm{of} \\ $$$$\mathrm{mass}\:\mathrm{30}\:\mathrm{kg}.\:\mathrm{When}\:\mathrm{he}\:\mathrm{pulls}\:\mathrm{on}\:\mathrm{the}\:\mathrm{rope}, \\ $$$$\mathrm{he}\:\mathrm{exerts}\:\mathrm{a}\:\mathrm{force}\:\mathrm{of}\:\mathrm{400}\:\mathrm{N}\:\mathrm{on}\:\mathrm{the}\:\mathrm{floor}\:\mathrm{of} \\ $$$$\mathrm{the}\:\mathrm{lift}.\:\mathrm{Calculate}\:\mathrm{acceleration}\:\mathrm{of}\:\mathrm{the} \\ $$$$\mathrm{lift}.\:\mathrm{Given}\:{g}\:=\:\mathrm{10}\:\mathrm{m}/\mathrm{s}^{\mathrm{2}} . \\ $$ Terms of Service Privacy…

cos-x-sin-x-1-sin-2x-sec-2x-tan-2x-prove-it-

Question Number 87069 by jagoll last updated on 02/Apr/20 $$\frac{\mathrm{cos}\:\mathrm{x}−\mathrm{sin}\:\mathrm{x}}{\:\sqrt{\mathrm{1}+\mathrm{sin}\:\mathrm{2x}}}\:=\:\mathrm{sec}\:\mathrm{2x}−\mathrm{tan}\:\mathrm{2x} \\ $$$$\mathrm{prove}\:\mathrm{it}\: \\ $$ Commented by jagoll last updated on 02/Apr/20 $$\sqrt{\mathrm{1}+\mathrm{sin}\:\mathrm{2x}}\:=\:\sqrt{\left(\mathrm{sin}\:\mathrm{x}+\mathrm{cos}\:\mathrm{x}\right)^{\mathrm{2}} } \\ $$$$=\:\mathrm{sin}\:\mathrm{x}+\mathrm{cos}\:\mathrm{x}\:…

Which-forces-of-attraction-are-responsible-for-liquefaction-of-H-2-a-Coulombic-forces-b-Dipole-forces-c-Hydrogen-bonding-d-Van-der-Waal-s-forces-

Question Number 21535 by Tinkutara last updated on 26/Sep/17 $$\mathrm{Which}\:\mathrm{forces}\:\mathrm{of}\:\mathrm{attraction}\:\mathrm{are}\:\mathrm{responsible} \\ $$$$\mathrm{for}\:\mathrm{liquefaction}\:\mathrm{of}\:\mathrm{H}_{\mathrm{2}} ? \\ $$$$\left({a}\right)\:\mathrm{Coulombic}\:\mathrm{forces} \\ $$$$\left({b}\right)\:\mathrm{Dipole}\:\mathrm{forces} \\ $$$$\left({c}\right)\:\mathrm{Hydrogen}\:\mathrm{bonding} \\ $$$$\left({d}\right)\:\mathrm{Van}\:\mathrm{der}\:\mathrm{Waal}'\mathrm{s}\:\mathrm{forces}. \\ $$ Terms of…

A-5-kg-body-is-suspended-from-a-spring-balance-and-an-identical-body-is-balanced-on-a-pan-of-a-physical-balance-If-both-the-balances-are-kept-in-an-elevator-then-what-would-happen-in-each-case-whe

Question Number 21516 by Tinkutara last updated on 26/Sep/17 $$\mathrm{A}\:\mathrm{5}-\mathrm{kg}\:\mathrm{body}\:\mathrm{is}\:\mathrm{suspended}\:\mathrm{from}\:\mathrm{a}\:\mathrm{spring}- \\ $$$$\mathrm{balance},\:\mathrm{and}\:\mathrm{an}\:\mathrm{identical}\:\mathrm{body}\:\mathrm{is} \\ $$$$\mathrm{balanced}\:\mathrm{on}\:\mathrm{a}\:\mathrm{pan}\:\mathrm{of}\:\mathrm{a}\:\mathrm{physical} \\ $$$$\mathrm{balance}.\:\mathrm{If}\:\mathrm{both}\:\mathrm{the}\:\mathrm{balances}\:\mathrm{are}\:\mathrm{kept} \\ $$$$\mathrm{in}\:\mathrm{an}\:\mathrm{elevator},\:\mathrm{then}\:\mathrm{what}\:\mathrm{would}\:\mathrm{happen} \\ $$$$\mathrm{in}\:\mathrm{each}\:\mathrm{case}\:\mathrm{when}\:\mathrm{the}\:\mathrm{elevator}\:\mathrm{is}\:\mathrm{moving} \\ $$$$\mathrm{with}\:\mathrm{an}\:\mathrm{upward}\:\mathrm{acceleration}? \\ $$ Answered…

The-length-of-an-ideal-spring-increases-by-0-1-cm-when-a-body-of-1-kg-is-suspended-from-it-If-this-spring-is-laid-on-a-frictionless-horizontal-table-and-bodies-of-1-kg-each-are-suspended-from-its-end

Question Number 21507 by Tinkutara last updated on 25/Sep/17 $$\mathrm{The}\:\mathrm{length}\:\mathrm{of}\:\mathrm{an}\:\mathrm{ideal}\:\mathrm{spring}\:\mathrm{increases} \\ $$$$\mathrm{by}\:\mathrm{0}.\mathrm{1}\:\mathrm{cm}\:\mathrm{when}\:\mathrm{a}\:\mathrm{body}\:\mathrm{of}\:\mathrm{1}\:\mathrm{kg}\:\mathrm{is} \\ $$$$\mathrm{suspended}\:\mathrm{from}\:\mathrm{it}.\:\mathrm{If}\:\mathrm{this}\:\mathrm{spring}\:\mathrm{is}\:\mathrm{laid} \\ $$$$\mathrm{on}\:\mathrm{a}\:\mathrm{frictionless}\:\mathrm{horizontal}\:\mathrm{table}\:\mathrm{and} \\ $$$$\mathrm{bodies}\:\mathrm{of}\:\mathrm{1}\:\mathrm{kg}\:\mathrm{each}\:\mathrm{are}\:\mathrm{suspended}\:\mathrm{from} \\ $$$$\mathrm{its}\:\mathrm{ends},\:\mathrm{then}\:\mathrm{what}\:\mathrm{will}\:\mathrm{be}\:\mathrm{the}\:\mathrm{increase} \\ $$$$\mathrm{in}\:\mathrm{its}\:\mathrm{length}? \\ $$ Commented…