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CBSE Class 11-science Answered

let angle beyween two nonzero vectors A bar and Bbar 120° and resultant be C bar
Asked by abhirathpatil1010 | 13 Mar, 2021, 02:38: PM
Expert Answer
begin mathsize 14px style c with rightwards arrow on top space equals a with rightwards arrow on top space plus space b with rightwards arrow on top end style
Let begin mathsize 14px style open vertical bar a with rightwards arrow on top close vertical bar end style = OA ,  begin mathsize 14px style open vertical bar b with rightwards arrow on top close vertical bar end style = OB and begin mathsize 14px style open vertical bar c with rightwards arrow on top close vertical bar end style = OC
begin mathsize 14px style O C space equals space square root of O A squared space plus space O B squared space minus space 2 space cross times O A space cross times O B cross times space cos 60 end root end style
begin mathsize 14px style open vertical bar c with rightwards arrow on top close vertical bar space equals space square root of open vertical bar a with rightwards arrow on top close vertical bar squared plus space open vertical bar b with rightwards arrow on top close vertical bar squared space minus open vertical bar a with rightwards arrow on top close vertical bar open vertical bar b with rightwards arrow on top close vertical bar end root space end style
Answered by Thiyagarajan K | 13 Mar, 2021, 03:09: PM
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