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Grade: 12
        the length of a chord of the parabola x^2=4ay passing through the vertex and having slope tanA is?
6 years ago

Answers : (2)

Revant Buch
19 Points
							let a point 
on parabola be 2at,at^2.  its vertex is the origin. the slope of chord is given by 
(at^2-0)/(2at-0)=tanA, implies t=2*tanA. length of chord is the distance between origin and the point of intersection i.e sq.root({at^2}^2+{2at}^2). substitute value of t to get answer to be 4asecAtanA.
						
6 years ago
anusha
12 Points
							a particle of mass 1 kg and carrying 0.01C is at rest on a inclined plane of angle 30 degrees with the horizontal when an electric field of 490/sq root(3)  N/C applied parallel to the horizontal,the coefficient of friction is?
						
6 years ago
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