Menu Close

Category: Others

A-thin-bi-convex-lens-rest-on-a-plane-mirror-it-is-found-that-a-point-objects-placed-20cm-above-the-object-coincide-with-it-own-image-Determine-the-position-and-nature-of-the-image-when-the-obje

Question Number 19345 by tawa tawa last updated on 10/Aug/17 $$\mathrm{A}\:\mathrm{thin}\:\mathrm{bi}\:−\:\mathrm{convex}\:\mathrm{lens}\:\mathrm{rest}\:\mathrm{on}\:\mathrm{a}\:\mathrm{plane}\:\mathrm{mirror}\:.\:\:\mathrm{it}\:\mathrm{is}\:\mathrm{found}\:\mathrm{that}\:\mathrm{a}\:\mathrm{point} \\ $$$$\mathrm{objects}\:\mathrm{placed}\:\mathrm{20cm}\:\mathrm{above}\:\mathrm{the}\:\mathrm{object}\:\mathrm{coincide}\:\mathrm{with}\:\mathrm{it}\:\mathrm{own}\:\mathrm{image}. \\ $$$$\mathrm{Determine}\:\mathrm{the}\:\mathrm{position}\:\mathrm{and}\:\mathrm{nature}\:\mathrm{of}\:\mathrm{the}\:\mathrm{image}\:\mathrm{when}\:\mathrm{the}\:\mathrm{object}\:\mathrm{is}\:\mathrm{placed} \\ $$$$\left(\mathrm{i}\right)\:\mathrm{8cm}\:\:\mathrm{and}\:\:\left(\mathrm{ii}\right)\:\mathrm{12}\:\:\:\:\mathrm{from}\:\mathrm{the}\:\mathrm{lens}\:\mathrm{mirror}\:\mathrm{combinatiom} \\ $$ Terms of Service Privacy Policy Contact:…

Question-19341

Question Number 19341 by tawa tawa last updated on 09/Aug/17 Commented by tawa tawa last updated on 09/Aug/17 $$\left(\mathrm{1}\right)\:\mathrm{Using}\:\mathrm{Stoke}'\mathrm{s}\:\mathrm{theorem},\:\mathrm{find}\:\:\oint\:\:\mathrm{y}^{\mathrm{2}} \mathrm{dx}\:+\:\mathrm{z}^{\mathrm{2}} \mathrm{dy}\:+\:\mathrm{x}^{\mathrm{2}} \mathrm{dz}\:,\:\:\mathrm{where}\:\:\Gamma\:\mathrm{is}\:\mathrm{the}\:\mathrm{closed} \\ $$$$\mathrm{curve}\:\:\mathrm{A}\rightarrow\mathrm{B}\rightarrow\mathrm{C}\rightarrow\mathrm{A}\:\:\mathrm{and}\:\:\mathrm{A}\:=\:\left(\mathrm{1},\:\mathrm{0},\:\mathrm{0}\right),\:\:\mathrm{B}\:=\:\left(\mathrm{0},\:\mathrm{0},\:\mathrm{1}\right),\:\:\mathrm{C}\left(\mathrm{0},\:\mathrm{1},\:\mathrm{0}\right). \\…

A-particle-P-is-sliding-down-a-frictionless-hemispherical-bowl-It-passes-the-point-A-at-t-0-At-this-instant-of-time-the-horizontal-component-of-its-velocity-is-v-A-bead-Q-of-the-same-mass-as-P-i

Question Number 19223 by Tinkutara last updated on 07/Aug/17 $$\mathrm{A}\:\mathrm{particle}\:{P}\:\mathrm{is}\:\mathrm{sliding}\:\mathrm{down}\:\mathrm{a}\:\mathrm{frictionless} \\ $$$$\mathrm{hemispherical}\:\mathrm{bowl}.\:\mathrm{It}\:\mathrm{passes}\:\mathrm{the}\:\mathrm{point} \\ $$$${A}\:\mathrm{at}\:{t}\:=\:\mathrm{0}.\:\mathrm{At}\:\mathrm{this}\:\mathrm{instant}\:\mathrm{of}\:\mathrm{time},\:\mathrm{the} \\ $$$$\mathrm{horizontal}\:\mathrm{component}\:\mathrm{of}\:\mathrm{its}\:\mathrm{velocity}\:\mathrm{is} \\ $$$${v}.\:\mathrm{A}\:\mathrm{bead}\:{Q}\:\mathrm{of}\:\mathrm{the}\:\mathrm{same}\:\mathrm{mass}\:\mathrm{as}\:{P}\:\mathrm{is} \\ $$$$\mathrm{ejected}\:\mathrm{from}\:{A}\:\mathrm{at}\:{t}\:=\:\mathrm{0}\:\mathrm{along}\:\mathrm{the} \\ $$$$\mathrm{horizontal}\:\mathrm{direction},\:\mathrm{with}\:\mathrm{the}\:\mathrm{speed}\:{v}. \\ $$$$\mathrm{Friction}\:\mathrm{between}\:\mathrm{the}\:\mathrm{bead}\:\mathrm{and}\:\mathrm{the} \\…

A-river-of-width-d-is-flowing-with-speed-u-as-shown-in-the-figure-John-can-swim-with-maximum-speed-v-relative-to-the-river-and-can-cross-it-in-shortest-time-T-John-starts-at-A-B-is-the-point-direct

Question Number 19200 by Tinkutara last updated on 06/Aug/17 $$\mathrm{A}\:\mathrm{river}\:\mathrm{of}\:\mathrm{width}\:{d}\:\mathrm{is}\:\mathrm{flowing}\:\mathrm{with}\:\mathrm{speed} \\ $$$${u}\:\mathrm{as}\:\mathrm{shown}\:\mathrm{in}\:\mathrm{the}\:\mathrm{figure}.\:\mathrm{John}\:\mathrm{can}\:\mathrm{swim} \\ $$$$\mathrm{with}\:\mathrm{maximum}\:\mathrm{speed}\:{v}\:\mathrm{relative}\:\mathrm{to}\:\mathrm{the} \\ $$$$\mathrm{river}\:\mathrm{and}\:\mathrm{can}\:\mathrm{cross}\:\mathrm{it}\:\mathrm{in}\:\mathrm{shortest}\:\mathrm{time} \\ $$$${T}.\:\mathrm{John}\:\mathrm{starts}\:\mathrm{at}\:{A}.\:{B}\:\mathrm{is}\:\mathrm{the}\:\mathrm{point} \\ $$$$\mathrm{directly}\:\mathrm{opposite}\:\mathrm{to}\:{A}\:\mathrm{on}\:\mathrm{the}\:\mathrm{other} \\ $$$$\mathrm{bank}\:\mathrm{of}\:\mathrm{the}\:\mathrm{river}.\:\mathrm{If}\:{t}\:\mathrm{be}\:\mathrm{the}\:\mathrm{time}\:\mathrm{John} \\ $$$$\mathrm{takes}\:\mathrm{to}\:\mathrm{reach}\:\mathrm{the}\:\mathrm{opposite}\:\mathrm{bank},\:\mathrm{match} \\…

Question-150228

Question Number 150228 by learner001 last updated on 10/Aug/21 Commented by learner001 last updated on 10/Aug/21 $$\mathrm{please}\:\mathrm{someone}\:\mathrm{explain}\:\mathrm{how}\:\mathrm{the}\:\mathrm{inequality}\:\mathrm{sign} \\ $$$$\mathrm{is}\:\mathrm{reserved}?\:\mathrm{after}\:\mathrm{ther}\:\mathrm{multiplied}\:\mathrm{through}\:\mathrm{by}\:\mathrm{a} \\ $$$$\mathrm{negative}. \\ $$ Terms of…