http://questionpaper.in/QuestionPaper.aspx?id=590&bn=46
here we can find previous years bits papers
mole concept
1.who started symbolic representation of elements which we use today
a) dalton b) berzelius
yes manmay the ans is 82.4.................plz post the solution
u cn take for simplicity unit vectors in directions of p,q,r..[1]
http://questionpaper.in/QuestionPaper.aspx?id=590&bn=46
here we can find previous years bits papers
jst like taking them as unit vectors in directions of x , y & z axis?
sakshi simply assume the vector X as a.p+b.q+c.r[1]
now substitute in ur given relation
and equate the various coefficients[1]and hence find value of a,b,c....i hope u cn now finish off the thing!
let p , q ,r be three mutually perpendicular vectors of same magnitude . if a vector x satisfies the relation
p x [ (x - q) x p ] + q x [ (x -r) x q ] + r x [ ( x-p) x r ] = 0 , then x is given by
a) 1/2 ( p+ q -2r) b) 1/2 (p+q+r ) c ) 1/3 ( p+ q + r ) d ) 1/3 ( 2p + q - r )
regarding post #17 in terms of wat u want me to answer it???[i mean they must have given options...else there r many possible answers in terms of different vectros.so plz kindly complete the question[1]]
sakshi i will make things easy for u for this one...[don mind but i m not posting complete solution as i want u to think n develop on these HINTs i m giving]
a cross 2b is perpendicular to a n b.....≈> c is perpendicular to a n b[1]
a x b + b x c + c x a =a x b - b x (a x 2b) +a x(a x 2b)
=4 (a x b)
= -2c
if a vector a is xpressed as p & q such that p & q r respectively parallel & perpendicular to a vector b then b=?
a ,b,c r all vectors
a x 2b + c = 0 , then a x b + b x c + c x a = ?
well from side of manmay i m posting[hope u won't mnd manmay[3]]/
ROH+CH3MgI------>RCH3+Mg(OH)I
now 10-3*4.12/R+17 = 1.12/22400
≈> R=65.4 g
now ROH=65.4+16+1=82.4g
up the plane T = 2usin (α- β)gcos β
now taking x - axis along the plane, velocity component( when particle strikes the plane) along the plane is 0
so applying equations of motion v = u + at
→ 0 = u cos (α-β) - gsin β .T
→ u cos ( α - β ) = gsin β 2usin (α- β)gcos β
→ 2 tan β = cot ( α - β )
→ 2 tan( α - β ) = cot β
hence ( B) is answer [1]
another question
A particle is projected at an angle α with the horizontal from the foot of an inclined plane making an angle β with the horizontal. Which of the following holds good if the particle strikes the inclined plane normally?
a)cotβ = tan(α-β)
b)cotβ = 2tan(α-β)
c)cotα = tan(α-β)
d)cotα = 2tan(α-β)
1.12 ml of a gas is produced at S.T.P. BY THE ACTION OF 4.12 mg of alcohol ROH with methyl magnesium iodide ..........the molecular mass of the alcohol is?