Question

QUESTION 40 A larpe curved Dam is created by rotating the triangle shape BCD through an angle of 60"radions) about vertical axis -9. The drawing is not to scale. -1035ft- 100ft dB 35 1 000ft Determine the Surface Area of the Dam's downstream face (created by the revolution of line DB). 105 (1092 117 (109) 109 (10) #2 113 (1092

Answer 1

Solution:- the figure given in the question are as follows:

-1035 ft 100 ft 35 ft 1000 ft

surface area of dam downstream side=BD*(1035-35)

where, BD=CD/sin60=100/sin60

BD=115.47 ft

surface area of dam in downstream face (side)(A)=115.47*1000=115.47*10^3 ft^2

surface area of dam in downstream face (side)(A)=115.47*10^3 ft^2 , (this area is near by 117*10^3 ft^2)

exact surface area of dam in downstream face (side)(A)=115.47*10^3 ft^2

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