Solving for Vv= The doppler Effect

[XxphysicsxX]

The problem:
I have to answer a question about the Doppler effect using the formula attached.
I know i have to solve for Vw, but I get
Vw/Vw=(Fd/Fs)(-Fs)

and I am possitive that's not right, can someone please help me out??
Thankyou

 

[rl.bhat]

Transfer the denominator in the right hand side to the left hand side. Simplify and collect the terms containing fw.

 

[XxphysicsxX]

i get:

Fd (Vw- Vs) = VwFs
Fd( Vw-Vs) - Vw= Fs

but the two Vw just cancel each other out again..
I don't know what I am doing wrong...

 

[rl.bhat]

i get:

Fd (Vw- Vs) = VwFs
Fd( Vw-Vs) - Vw= Fs
but the two Vw just cancel each other out again..
I don't know what I am doing wrong...

The second step is wrong.

F_d(V_w - V_s) = V_wF_s

F_dV_w - F_dV_s = V_wF_s
In the multiplication you cannot transfer a single term to the other side.
Now collect the terms containing v_w on one side and find its expression.

 

[AC130Nav]

The problem:
I have to answer a question about the Doppler effect using the formula attached.
I know i have to solve for Vw, but I get
Vw/Vw=(Fd/Fs)(-Fs)

and I am positive that's not right, can someone please help me out??
Thankyou

Given Fd = [Vw/(Vw-Vs)]Fs then
(Vw-Vs)/Vw = Fs/Fd

Simplify the lefthand term to get Vw by itself and continue.