Help With Urgent Aero Question - Show Me the Workings

[lauraosborn]

Urgent Aero question help!

I can't seem to do this question without the static pressure given.
Can someone show me the workings and how it is done?

I can't seem to do this question without the static pressure given. Can someone show me the workings and how it is done? Question >> hxxp://postimage.org/image/cp3w7a7jl/

 

[Travis_King]

Rules is rules, you've got to show your attempt. What have you tried. List your knowns, your equations, etc. Then we can help fill in the missing pieces.

 

[lauraosborn]

formula i am thinking of using is True air speed, V^2= (2a^2)/(1.4-1) x [(total pressure/ static pressure)^((1.1-1)/1.4) -1]

but since only total pressure of 84.2 KPa is given, i cannot get the true air speed without static pressure. and other formulas for equivalent airspeed and calibrated airspeed also needs static pressure to calculate

 

[Travis_King]

You know the pressure altitude, though, no? That number comes from an existing equation.

 

[lauraosborn]

erm, is there a formula that links the pressure altitude to static pressure? (sorry if i sound dumb >_<)

 

[Travis_King]

Check this link out

(Oops, looks like your equation is the same anyway, either way, it's a good link).

As far as the static pressure goes, here's a good estimate: Engineering Toolbox

 

[lauraosborn]

will do, thanks a lot for your help