What if a galaxy was not tilted but was positioned toward us perfectly face-on

Tully-Fisher Technique would not work

Explanation:

- The complete question is given in attachment

Solution:

- If the galaxy was positioned towards face-on and not tilted the gravitational attraction would cease. So the stars in galaxy would neither come closer or distance from us.

- This phenomenon would not cause a shift in wavelength/frequency and measurement of shift using Doppler's Effect is impossible as their no motion towards or away from us. Hence, the Tully-Fisher Technique would not work.