A = 247 m, B = 236 m, C = 314 m D = 396 m respectively. The distances of B, C and D from A are 12 km, 45 km and 60 km respectively. Considering the effect of curvature and refraction of the earth. (a) Compute the height of equal towers on A and D to sight over B and C with a 3 m clearance. (b) Compute the elevation of the line of sight at B with the installation of equal heights of tower at A and D. (c) Compute the height of tower at A with a clearance of 3 m at C so that D will be visible from A, if the height of tower at D is 2 m.
A = 247 m, B = 236 m, C = 314 m D = 396 m respectively. The distances of B, C and D from A are 12 km, 45 km and 60 km respectively. Considering the effect of curvature and refraction of the earth. (a) Compute the height of equal towers on A and D to sight over B and C with a 3 m clearance. (b) Compute the elevation of the line of sight at B with the installation of equal heights of tower at A and D. (c) Compute the height of tower at A with a clearance of 3 m at C so that D will be visible from A, if the height of tower at D is 2 m.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Four hills A, B, C and D are in straight line. The elevations are
A = 247 m,
B = 236 m,
C = 314 m
D = 396 m respectively.
The distances of B, C and D from A are 12 km, 45 km and 60
km respectively. Considering the effect of curvature and refraction of the earth.
(a) Compute the height of equal towers on A and D to sight over B and C with a 3 m clearance.
(b) Compute the elevation of the line of sight at B with the installation of equal heights of tower at A and D.
(c) Compute the height of tower at A with a clearance of 3 m at C so that D will be visible from A, if the height of tower at D is 2 m.
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