Question

Hmm okay, I don't even know where to start. Any idea? :)

Answer 1

`32.7`

Explanation:

the wind speed given is `12` m/s.

the three formulas given apply to different values of `v`.
`1.79<= 12 < 20`
`therefore 1.79<=v<20`

this means that the second formula given should be applied.

`W(t) = 33 - ((10.45+10sqrtv-v)(33-t))/(2204)`

`v` is `12`, and `t` is `15`.

substituting in and calculating:

`W(t) = 33 - ((10.45+10sqrt12-12)(33-15))/(2204)`

`10.45+10sqrt12-12 = 33.091016151...`

`(10.45+10sqrt12-12) * 18 = 595.638290724..`

`((10.45+10sqrt12-12) * 18)/(2204) = 0.270253...`

`33- ((10.45+10sqrtv-v)(33-t))/(2204) = 33-0.270253...`

`= 32.7` (1d.p.)

`W(t) = 32.7` (1d.p.)