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Question-151204

Question Number 151204 by kalenis last updated on 19/Aug/21 Answered by JDamian last updated on 19/Aug/21 $$\left(\mathrm{1}\right) \\ $$$$\mathrm{Z}\left\{{y}\left[{k}+\mathrm{2}\right]+\mathrm{3}{y}\left[{k}+\mathrm{1}\right]+\mathrm{2}{y}\left[{k}\right]\right\}=\mathrm{Z}\left\{{x}\left[{k}\right]\right\} \\ $$$${z}^{\mathrm{2}} {Y}\left({z}\right)+\mathrm{3}{zY}\left({z}\right)+\mathrm{2}{Y}\left({z}\right)={X}\left({z}\right) \\ $$$$\left({z}^{\mathrm{2}} +\mathrm{3}{z}+\mathrm{2}\right){Y}\left({z}\right)={X}\left({z}\right)…

What-is-the-difference-between-and-Where-is-used-

Question Number 20058 by Tinkutara last updated on 21/Aug/17 $$\mathrm{What}\:\mathrm{is}\:\mathrm{the}\:\mathrm{difference}\:\mathrm{between}\:\oint\:\mathrm{and} \\ $$$$\int?\:\mathrm{Where}\:\mathrm{is}\:\oint\:\mathrm{used}? \\ $$ Answered by dioph last updated on 21/Aug/17 $$\oint\:\mathrm{indicates}\:\mathrm{the}\:\mathrm{integral}\:\mathrm{is}\:\mathrm{calculated} \\ $$$$\mathrm{in}\:\:\mathrm{closed}\:\mathrm{path}.\:\mathrm{For}\:\mathrm{instance},\:\mathrm{for} \\…

Anyone-who-has-a-very-high-passion-for-Mathematics-should-join-AoPS-community-It-has-all-types-of-groups-from-middle-school-math-to-olympiad-to-college-math-But-a-new-user-can-only-post-3-topics-T

Question Number 20046 by Tinkutara last updated on 20/Aug/17 $$\mathrm{Anyone}\:\mathrm{who}\:\mathrm{has}\:\mathrm{a}\:\mathrm{very}\:\mathrm{high}\:\mathrm{passion} \\ $$$$\mathrm{for}\:\mathrm{Mathematics}\:\mathrm{should}\:\mathrm{join}\:\mathrm{AoPS} \\ $$$$\mathrm{community}.\:\mathrm{It}\:\mathrm{has}\:\mathrm{all}\:\mathrm{types}\:\mathrm{of}\:\mathrm{groups}, \\ $$$$\mathrm{from}\:\mathrm{middle}\:\mathrm{school}\:\mathrm{math}\:\mathrm{to}\:\mathrm{olympiad} \\ $$$$\mathrm{to}\:\mathrm{college}\:\mathrm{math}.\:\mathrm{But}\:\mathrm{a}\:\mathrm{new}\:\mathrm{user}\:\mathrm{can} \\ $$$$\mathrm{only}\:\mathrm{post}\:\mathrm{3}\:\mathrm{topics}.\:\mathrm{This}\:\mathrm{restriction}\:\mathrm{will} \\ $$$$\mathrm{be}\:\mathrm{removed}\:\mathrm{after}\:\mathrm{2}\:\mathrm{weeks}.\:\mathrm{Thanks}\:\mathrm{for} \\ $$$$\mathrm{joining}.\:\mathrm{Sign}\:\mathrm{up}\:\mathrm{on}: \\…

In-the-situation-given-all-surfaces-are-frictionless-pulley-is-ideal-and-string-is-light-F-mg-2-find-the-acceleration-of-block-2-

Question Number 20042 by Tinkutara last updated on 20/Aug/17 $$\mathrm{In}\:\mathrm{the}\:\mathrm{situation}\:\mathrm{given},\:\mathrm{all}\:\mathrm{surfaces}\:\mathrm{are} \\ $$$$\mathrm{frictionless},\:\mathrm{pulley}\:\mathrm{is}\:\mathrm{ideal}\:\mathrm{and}\:\mathrm{string}\:\mathrm{is} \\ $$$$\mathrm{light},\:{F}\:=\:\frac{{mg}}{\mathrm{2}}\:,\:\mathrm{find}\:\mathrm{the}\:\mathrm{acceleration}\:\mathrm{of} \\ $$$$\mathrm{block}\:\mathrm{2}. \\ $$ Commented by Tinkutara last updated on 20/Aug/17…

In-the-figure-shown-m-slides-on-inclined-surface-of-wedge-M-If-velocity-of-wedge-at-any-instant-be-v-find-velocity-of-m-with-respect-to-ground-

Question Number 20038 by Tinkutara last updated on 20/Aug/17 $$\mathrm{In}\:\mathrm{the}\:\mathrm{figure}\:\mathrm{shown},\:{m}\:\mathrm{slides}\:\mathrm{on} \\ $$$$\mathrm{inclined}\:\mathrm{surface}\:\mathrm{of}\:\mathrm{wedge}\:{M}.\:\mathrm{If}\:\mathrm{velocity} \\ $$$$\mathrm{of}\:\mathrm{wedge}\:\mathrm{at}\:\mathrm{any}\:\mathrm{instant}\:\mathrm{be}\:{v},\:\mathrm{find} \\ $$$$\mathrm{velocity}\:\mathrm{of}\:{m}\:\mathrm{with}\:\mathrm{respect}\:\mathrm{to}\:\mathrm{ground}. \\ $$ Commented by Tinkutara last updated on 20/Aug/17…

The-system-shown-in-figure-is-given-an-acceleration-a-toward-left-Assuming-all-the-surfaces-to-be-frictionless-find-the-force-on-the-sphere-by-inclined-surface-

Question Number 20040 by Tinkutara last updated on 20/Aug/17 $$\mathrm{The}\:\mathrm{system}\:\mathrm{shown}\:\mathrm{in}\:\mathrm{figure}\:\mathrm{is}\:\mathrm{given}\:\mathrm{an} \\ $$$$\mathrm{acceleration}\:'{a}'\:\mathrm{toward}\:\mathrm{left}.\:\mathrm{Assuming} \\ $$$$\mathrm{all}\:\mathrm{the}\:\mathrm{surfaces}\:\mathrm{to}\:\mathrm{be}\:\mathrm{frictionless},\:\mathrm{find} \\ $$$$\mathrm{the}\:\mathrm{force}\:\mathrm{on}\:\mathrm{the}\:\mathrm{sphere}\:\mathrm{by}\:\mathrm{inclined} \\ $$$$\mathrm{surface}. \\ $$ Commented by Tinkutara last updated…

In-the-following-cases-find-out-the-acceleration-of-the-wedge-and-the-block-if-an-external-force-F-is-applied-as-shown-Both-pulleys-and-strings-are-ideal-

Question Number 20035 by Tinkutara last updated on 20/Aug/17 $$\mathrm{In}\:\mathrm{the}\:\mathrm{following}\:\mathrm{cases},\:\mathrm{find}\:\mathrm{out}\:\mathrm{the} \\ $$$$\mathrm{acceleration}\:\mathrm{of}\:\mathrm{the}\:\mathrm{wedge}\:\mathrm{and}\:\mathrm{the}\:\mathrm{block}, \\ $$$$\mathrm{if}\:\mathrm{an}\:\mathrm{external}\:\mathrm{force}\:{F}\:\mathrm{is}\:\mathrm{applied}\:\mathrm{as} \\ $$$$\mathrm{shown}.\:\left(\mathrm{Both}\:\mathrm{pulleys}\:\mathrm{and}\:\mathrm{strings}\:\mathrm{are}\right. \\ $$$$\left.\mathrm{ideal}\right) \\ $$ Commented by Tinkutara last updated…

A-person-in-lift-is-holding-a-water-jar-which-has-a-small-hole-at-the-lower-end-of-its-side-When-the-lift-is-at-rest-the-water-jet-coming-out-of-the-hole-hits-the-floor-of-the-lift-at-a-distance-d-

Question Number 20014 by Tinkutara last updated on 20/Aug/17 $$\mathrm{A}\:\mathrm{person}\:\mathrm{in}\:\mathrm{lift}\:\mathrm{is}\:\mathrm{holding}\:\mathrm{a}\:\mathrm{water}\:\mathrm{jar}, \\ $$$$\mathrm{which}\:\mathrm{has}\:\mathrm{a}\:\mathrm{small}\:\mathrm{hole}\:\mathrm{at}\:\mathrm{the}\:\mathrm{lower}\:\mathrm{end} \\ $$$$\mathrm{of}\:\mathrm{its}\:\mathrm{side}.\:\mathrm{When}\:\mathrm{the}\:\mathrm{lift}\:\mathrm{is}\:\mathrm{at}\:\mathrm{rest},\:\mathrm{the} \\ $$$$\mathrm{water}\:\mathrm{jet}\:\mathrm{coming}\:\mathrm{out}\:\mathrm{of}\:\mathrm{the}\:\mathrm{hole}\:\mathrm{hits} \\ $$$$\mathrm{the}\:\mathrm{floor}\:\mathrm{of}\:\mathrm{the}\:\mathrm{lift}\:\mathrm{at}\:\mathrm{a}\:\mathrm{distance}\:{d}\:\mathrm{of} \\ $$$$\mathrm{1}.\mathrm{2}\:\mathrm{m}\:\mathrm{from}\:\mathrm{the}\:\mathrm{person}.\:\mathrm{In}\:\mathrm{the}\:\mathrm{following}, \\ $$$$\mathrm{state}\:\mathrm{of}\:\mathrm{the}\:\mathrm{lift}'\mathrm{s}\:\mathrm{motion}\:\mathrm{is}\:\mathrm{given}\:\mathrm{in}\:\mathrm{List} \\ $$$$\mathrm{I}\:\mathrm{and}\:\mathrm{the}\:\mathrm{distance}\:\mathrm{where}\:\mathrm{the}\:\mathrm{water}\:\mathrm{jet} \\…

An-aeroplane-has-to-go-from-a-point-A-to-point-B-500-km-away-due-30-east-of-north-A-wind-is-blowing-due-north-at-a-speed-of-20-ms-1-The-air-speed-of-the-plane-is-150-ms-1-Find-the-directi

Question Number 19986 by Tinkutara last updated on 19/Aug/17 $$\mathrm{An}\:\mathrm{aeroplane}\:\mathrm{has}\:\mathrm{to}\:\mathrm{go}\:\mathrm{from}\:\mathrm{a}\:\mathrm{point}\:{A} \\ $$$$\mathrm{to}\:\mathrm{point}\:{B},\:\mathrm{500}\:\mathrm{km}\:\mathrm{away}\:\mathrm{due}\:\mathrm{30}°\:\mathrm{east} \\ $$$$\mathrm{of}\:\mathrm{north}.\:\mathrm{A}\:\mathrm{wind}\:\mathrm{is}\:\mathrm{blowing}\:\mathrm{due}\:\mathrm{north} \\ $$$$\mathrm{at}\:\mathrm{a}\:\mathrm{speed}\:\mathrm{of}\:\mathrm{20}\:\mathrm{ms}^{−\mathrm{1}} .\:\mathrm{The}\:\mathrm{air}\:\mathrm{speed}\:\mathrm{of} \\ $$$$\mathrm{the}\:\mathrm{plane}\:\mathrm{is}\:\mathrm{150}\:\mathrm{ms}^{−\mathrm{1}} .\:\mathrm{Find}\:\mathrm{the}\:\mathrm{direction} \\ $$$$\mathrm{in}\:\mathrm{which}\:\mathrm{the}\:\mathrm{pilot}\:\mathrm{should}\:\mathrm{head}\:\mathrm{the} \\ $$$$\mathrm{plane}\:\mathrm{to}\:\mathrm{reach}\:\mathrm{point}\:{B}. \\…