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An arch is in the shape of a parabola whose axis is vertically downwords and measures 24 mts across its boltom on the ground. Its highest point is 24 mts. The measure of the horizontal beam across its cross section at a height or 18 mts is

A

50

B

40

C

45

D

60

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Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-PARABOLA-EXERCISE- II
  1. The angle subtended by the double ordinate of length 8a of the parabol...

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  2. PQ is a double ordinate of the parabola y^(2)+4x . The locus of its po...

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  3. An arch is in the shape of a parabola whose axis is vertically downwor...

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  4. The point or contact of the Une 2x-y+2 = 0 with the parabola y^(2)=16x...

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  5. The equation of the tangent to the parabola y^(2)=8x inclined at 30^(@...

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  6. The straight line x+y touches the parabola y=x-x^(2) then k =

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  7. Point of contact of y=1-x w.r.t. y^(2)-y+x=0 is

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  8. The line among the following that touches the parabola y^(2)=4ax is

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  9. Assertion (A) : The locus of the point of intersection of perpendicul...

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  10. Two tangents are drawn from (- 2, -1) to y^(2) = 4x. If theta is the a...

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  11. A circle of radius 4 drawn on a chord of the parabola y^(2)=8x as diam...

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  12. Angle between tangents drawn from origin to parabola y^(2)= 4a(x-a)is

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  13. The angle between tangents to the parabola y^(2)=4x at the points wher...

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  14. Statement-I : The condition for the line y = mx+c to be a tangent to (...

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  15. The condition that the line y=mx+c to be a tangent to the parabola y^(...

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  16. If the common tangent to circle x^(2)+y^(2)= c^(2) and the parabola y^...

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  17. Let x+y=k be a normal to the parabola y^(2)=12x . If p is the length o...

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  18. Equation of line touching both parabolas y^(2)=4x and x^(2) = -32y is

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  19. The points of contact of the tangents drawn from the point (4, 6) to t...

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  20. The locus of point of intersection of tangents to y^(2) = 4ax which in...

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