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A high-voltage power line is a catenary described by y = 9cosh(x/9) find the ratio of the area under the catenary to its arc length.

Sagot :

The correct answer for  the ratio of the area under the catenary to its arc length is 12 : 1 .

y = 12cosh(x/12) Since the анс length from FGN) on the interval [c, d] is Arc length =

Let y' =f'(x)  prime  = derivative of 12cosh(x/12) for x = Sinh(x/12) .

. A(x)  length = ∫√1+ Sinh² (1/2). dx

= int c ^ d sqrt(cosh^2 (alpha/12)) * dx

= integrate  d from c to d cosh( x 12 )* dx

=[12. sinh(x/12) ] e ^ d

= 12[sinh(d/12) - sinh(c/12)]

and area under f(x) on the interval [c, d]

Area = ∫ f(x).dx from [c,d ]

= 144[sinh(d/12) - sinh(c/12)]

the area ratio of the area under the catenary to it's length is

= 144[sinh((d)/12) - sinh(c/12))/ 12[sinh( d/ 12 ) -sinh( c /12 )] .

=12

So, ratio is 12:1

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