Page 7 - Bigyan_Katha_Feb_2021

‰Zwi nq gj~ Z ‡eZ w`‡q| ‰Zwii mgq GB ‡e‡Zi gvc KZ n‡e Zv wVK Kiv nq MvwYwZK wbq‡g| Avgiv Rvwb e‡„ Ëi cwiwa = cvB × e¨vm| cvB-Gi Avmbœ gvb = 3.14| ZvB ‡h avgvwU ‡evbv n‡e Zvi cwiwa wVK Kivi Rb¨ ‡eZ¸wj‡K e¨v‡mi wZb¸Y j¤v^ ‡bIqv nq| GKUv gvcvi KvwV w`‡q wZb¸Y ‡g‡c Zvici mvgvb¨ GKUy ‡ewk wb‡q ‡eZ¸‡jv ‡K‡U ‡bIqv nq|
MÖvgevsjvi AwaKvsk PvwlB Rwg Pvl K‡i jvO‡ji mvnv‡h¨| GB jvOj ‰Zwi‡ZI R¨vwgwZK wPšÍvfvebv we`¨gvb| ‡h KvV w`‡q jvOj ‰Zwi Kiv nq Zvi `y-av‡ii Zyjbvq ga¨fvM _v‡K ‡gvUv hv‡Z hvwš¿K myweav cvIqv hvq| Pvwl hv‡Z `vuwo‡q jvOj w`‡q f~wgKl©Y Ki‡Z cv‡i ‡mRb¨ jvOjwU ¯’~j‡Kv‡Y evuKv‡bv _v‡K|
‡bŠKv ‡`Šo cwÖ Z‡hvwMZvq ‡h ‡bŠKv e¨envi Kiv nq Zvi wbgv© Y-‡KŠkj mvaviY ‡bŠKv ‡_‡K wfbZœ i| `vou Uvbvi mv‡_ mv‡_ GB ‡bŠKv¸wj hv‡Z `i~ šÍ MwZ‡Z Q‡y U Pj‡Z cv‡i ‡mRb¨ G¸wji Mv‡q AvjKvZiv, Mve, Kjv I gq`v gvwL‡q wcw”Qj Kiv nq| Avi GB cwi‡e‡k QUy ‡Z wM‡q ‡bŠKv hv‡Z D‡ë bv hvq ‡mRb¨ ‡bŠKvi ‰`N¨© I c‡Ö ¯i’ g‡a¨ _v‡K GKwU Avbcy vwZK web¨vm| GB ai‡bi evB‡Pi ‡bŠKv mvaviYZ Pwjkø ‡_‡K lvU nvZ j¤v^ nq, Avi PIov nq gvÎ cvPu ‡_‡K Qq nvZ| A_v© r, Abcy v‡Zi wn‡m‡e 8:1 ‡_‡K 10:1| GB Avbcy vwZK web¨v‡mi d‡j ‡bŠKvi fvimvg¨ (balance) ‡hgb eRvq _v‡K ‡Zgb `æÖwZ (Speed) ev‡o| GQvovI G¸wji
wbgv© Y-‡KŠk‡j ‡h ‡Kv‡bv Ae¯v’ q G‡`i Awa‡K›`Ö (metacentre) memgq fi‡K›`Ö (Centre of
‡deaæqvix 2021 7 gravity) I ceø ‡K‡›`iÖ (Centre of buoyancy)
Dc‡i _v‡K|
‡jvKwk‡í ‡gvwU‡di e¨envi GKwU
¸iæZ¡c~Y© welq| G‡ÿ‡Î ‡gvwUd n‡”Q evOvwji HwZn¨ AvwkÖZ KZ¸wj ¯’vqx dg© ev wWRvBb, ‡h¸wj g~jZ cÖK...wZ ‡_‡K M„nxZ n‡jI e„Ë, eM©, i¤¢m (eiwd) BZ¨vw`i g‡Zv R¨vwgwZK iƒ‡ci Dcw¯’wZI cwijwÿZ nq| hyM hyM a‡i gvbe Rxe‡bi m‡1⁄2 MwY‡Zi ‡h eÜb M‡o D‡V‡Q Zvi e¨vwß GLb wekvj| e¯ÍyRM‡Zi mg¯Í wKQyB MvwYwZK m~‡Î Mvu_v| ZvB ejv hvq ‡jŠwKK mgv‡R MwY‡Zi Dcw¯’wZ GK mvgvwRK cÖwμqv| •
‡jLK RbweÁvb cÖPviK I RbwcÖq weÁvb ‡jLK | B‡gj: kbb.scwriter@gmail.com
evgb MvQ
ebmvB-Gi DrcwË N‡U Pxb ‡`‡k, cvÖ q nvRvi eQ‡iiI ‡ekx mgq Av‡M|ZLbGibvgwQjÔcby-mvBÕ|wewfbœcvÖYx,cvwLevWvaM‡bi AvKw... Zi ebmvB-Gi ‡m mgq we‡kl mgv`i wQj| c‡i ‡eŠ×ag© cPÖviK‡`igva¨‡gebmvB‰Zixic×wZPxbv‡`i‡_‡KRvcvbx‡`iKv‡Q ‡cŠQu vq| Rvcvbx‡`i wbôv I Aa¨emv‡qi ¸‡Y Kvjμ‡g ebmvB Rvcvbx D`¨vb ‰kjxi cZÖ xK n‡q I‡V|
cmÖ 1⁄2Ze‡jivLvfv‡jv‡h,wR‡biiKg‡diNwU‡qev‡Kv¬‡bi KvimvwR‡ZGBevgbMvQ‰ZixKivhvqbv|AveviGBaviYvI wVK bq ‡h, MvQ‡K Kó w`‡q ev Lvev‡ii ‡hvMv‡b KvU QvUu
NwU‡q ebmvB ‰Zix Kiv nq| Avm‡j D`¨vbwe`¨vi Ab¨vb¨e¨e¯v’iZjy bvqebmvB‰Zix‡ZMv‡QiÿwZ
KgB nq| ebmvB ‰Zix nq exR ‡_‡K mó„ Pviv MvQ A_ev KvwUs ‡_‡K| KLbI KLbI ni‡gv‡biAfv‡ecvÖKw...ZKfv‡e‡e‡uULv‡Uv n‡qcovMvQ‡KmivmwiU‡e¯v’bvšÍwiZ K‡iIebmvB-Giiƒc‡`Iqvnq|
ebmvB ‰Zixi c_Ö g av‡c gvwU‡K fv‡jvfv‡e ïwK‡q ¸‡u ov K‡i wb‡qZvim‡1⁄2nvo¸‡uov,ïK‡bv‡MveimviBZ¨vw`wgwk‡qgvwU ‰Zix K‡i ‡bIqv nq| Gici ‡h MvQwUi ebmvB ‰Zix n‡e ‡m'wU‡K ‡bIqv nq| Mv‡Qi caÖ vb ‡kKowU c_Ö ‡gB ‡K‡U ‡djv nq| Gi ci MvQwU‡K GKwU Av‡jvevZvm cY~ ©
RvqMvq ‡i‡L w`‡q wbqwgZ Rj ‡`Iqv nq| ‡kKo ‡K‡U ‡djvi av°v wKQUy v mvg‡j DV‡j,
MvQwUi Mv‡q Zvgv ev Ab¨ ‡Kvb avZe Zvi Rwo‡q Wvjcvjvi we‡kl
AvKw... Z ‡`Iqv nq, hv‡Z K‡i MvQwU‡K ‡`‡L cY~ v© 1⁄2 Mv‡Qi ÿ`z Ö ms¯‹iY e‡j g‡b nq| wVK g‡Zv AvKw... Z‡Z Avbvi Rb¨ c‡Ö qvR‡b Wvjcvjv GKUy ‡Q‡u UI ‡`Iqv nq| GB fv‡e Ni mvRv‡bvi Dch3y n‡q I‡V GKwU ebmvB| Z‡e memgq ebmvB ‡K ‡h N‡i mvwR‡q ivLv nq, Zv bq| evB‡i evMv‡bi Av‡jvQvqvgqcwi‡e‡kIebmvBLey m›y`igvbvq|AwaKvskebmvB
cKÖ w... Z Abhy vqx j¤v^ q 25 ‡mw›UwgUvi ‡_‡K 1 wgUvi chš© Í nq| Z‡e, ebmvB ‰Zix Kivi ‡_‡KI Zv‡K evwu P‡q ivLvi KvRUv A‡bK KwVb| GB ‡ÿ‡Î D`¨vbwe`¨vi Ávb _vKv ‡hgb Riæwi, ‡ZgbB Rvb‡Z n‡e MvQwU‡K ‡Kv_vq ivL‡Zn‡e,w`‡bKZUvRjw`‡Zn‡e,KLbUecwieZb© Ki‡Zn‡e, BZ¨vw` AviI n‡iK ‡Qv‡UvLv‡Uv mgm¨vi nvj nwKKZ|
mvaviYZ ‡h ‡Kvb eûelR© xex Kvôj eÿ„ ev ¸‡j¥iB ebmvB ‰Zix Kiv m¤¢e|GQvov‡KvbcvZvevnvievdjz wKsevd‡jiMvQA_ev¯í^ cwiwPZ ‡Kvb e‡y bv Mv‡QiI ebmvB n‡Z cv‡i| Z‡e ebmvB wkíxiv wbR¯^ ‡`kxq MvQcvjviebmvB‰ZixKi‡ZB‡ekxAvMnÖ ‡`Lvb|Rvcv‡bebmvB‰Zix nq mvaviYZ cvBb, A¨vRvwjqv, g¨vcj, BZ¨vw` Mv‡Qi| Avgv‡`i ‡`‡k
ebmvB wnmv‡e eU, Ak̦ , Avg, ‡je,y cvBb, wmjfvi IK, ccjvi,BZ¨vw`AviIA‡bKMvQ‡K‡e‡Q‡bIqvnq|
Z‡emgMÖwelqwUwbfi© Ki‡QwhwbebmvB‰Zix Ki‡Qb Zvi wPšÍvaviv Ges wkí fvebvi Dci, A_v© r Kxfv‡e wZwb MvQwUi iƒc ‡`‡eb|
Rvcvbx‡`invZa‡iBebmvBAvRGKwU c_„ K wk‡í cwiYZ n‡q‡Q Ges ¯v’ b K‡i
wb‡q‡Q gvb‡y li N‡i N‡i| Avgv‡`i ‡`‡kI GBwk‡íicPÖiy m¤¢vebvAv‡Q|Rvcvbx‡`iKv‡Q
ebmvB‡mŠfvM¨Gesms¯‹w...ZicZÖ xK|Ô‡Uv‡Kv‡bvgvÕ bv‡giwe‡klGwcKÖ UevcvøgMv‡QiebmvB‡KwN‡i
Zv‡`i beel© Drme cvwjZ nq| Avi evKx we‡ki¦ gvb‡y li Kv‡QebmvBAvRmvgvwRKcwÖZôvGescwÖZcwËicZÖ xK|
Avgv‡`i A‡b‡Ki Kv‡Q ebmvB Avevi Aemi KvUv‡bvi Ges ‰kwíK Avb‡›` ‡g‡Z IVvi Ab¨Zg caÖ vb gva¨g| •
‡jLK wewkó weÁvb ‡jLK Ges weÁvb cÖPviK| B-‡gj: dpanjanghosh@gmail.com
gv
`xcvÄb ‡Nvl
bly evgb n‡Z cv‡i; ZvB e‡j evgb MvQ! ïb‡Z AevK jvM‡jI K_vUv mwZ¨| MvQ‡K evgb evwb‡q ivLvi ‡h chÖ wy 3
Zvi‡cvlvwKbvgÔebmvBÕ|ebmvB‡KvbcvÖKw...ZKNUbvbq, gvb‡y li DTM¢vweZ c×wZ‡Z ‰Zix GKwU cY~ e© q¯‹ Mv‡Qi mswÿß cwÖ Ziƒc, hv AvKw... Z‡Z ÿ`z Ö Ges eq‡mI bexb| A_P ‡`L‡Z GKwU cY~ v© 1⁄2 ev eq‡mi fv‡i bây Mv‡Qi gZB| AwZ mn‡RB ‡cvovgvwU ev ‡cv‡mw© j‡bi U‡eewm‡qN‡ii‡Kv‡Yev‡Uwe‡jiDcimvwR‡qivLvhvq|GKK_vq ebmvB D`¨vbwe`¨vi we®§q!