vector question
Can some one explain this question. Don't know why but I got more confused after solving HC Verm
21 Replies
@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.Formula bhai
tanalpha = bsintheta/a+bcostheta
tanalpha is 1/0, therefore cross multiply
a+bcostheta = 0 , 4+6costheta = 0, costheta = -2/3
you could do this graphically too make the diagram
I guess it's side effect of coffee
From the morning I am solving physics only so I am getting dizzy ig
Also can you explain the method that HC verma used ?
they used resolutions of vectors
we know, the resultant is perpendicular, therefore there is component in the direction of A
so 6cos(180-theta) = 4
which is costheta = -2/3
Actually in HCV, the solution is given as a shortcut... It's the formula of tan alpha, where alpha= 90° ,tan alpha = a+bcostheta, and then find costheta, that's it
I am really getting more confused by HC verma
Actually , it's an advice, it's good to keep a book like Nootan handy... Those have elaboratw, I mean, too elaborate explanation to get basic strong
I do it too
yo bro then whts the mistake in my method
parallelogram law : OY^2+ OA^2 = 36
36-16= 20
root 20 = OY
aur A^2 + B^2 + 2ABcos theta = resultant^2
36+16 + 1152costheta= resultant^2
52+1152costheta= 20
-32/1152 cos inverse = theta
xd np np lol chill, thats physics. whtv u do u gotta fail before u get good in it. first time bhi mujhe bhi struggle kiya, rn a little struggling but relax
OY is the resultant mf 😭
yea
ah shi lol got it
no wait whts wrong i dont get it? root 20 = oy
you cant use parallelogram for this question
Because you only have a and b, parallelogram law has 4 variables and you have 2 of them
ahh why? like triangle law bhi aayega
better use the formula for angles
tanalpha = bsintehta/a+bcostheta
but
triangle law does come here right?
can you explain in more detail ?
from parallelogram law you mean this right ?
yea what he told here was correct i believe, well wht i did was take it parallel and then use triangle formula but it seems that method doesnt work, dw u going in the right path u will be hella confused but in 2 weeks or so everything will become clear dw
we good?
+solved @PeterGriffinItis @lakshya
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