The angular size of a black hole varies proportionately with its mass.
a) use your computed mass (from p3c above) to compare the angular linear sizes, in au, of the 6.5 billion m⊙ black hole in m87 and sgr a*.
b) which object subtends the greater apparent size and would therefore be easier to study?
c) what other factors complicate the study of sgr a*?

100 pounds is 100 pounds no matter the object or item being weighed

You would need to take a picture so i can see

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.