The importance of globular clusters in determining the correct location of the center of the milky way galaxy is that they contain cepheid stars whose absolute magnitudes can be determined from their periods of oscillation.

variable

Explanation:

Globular clusters is defined as collection of numerous star that revolve around the galaxy core. they are so bound to each other that they formed spherical shape. This boundness  among the star is  due to gravity. The main characteristics of globular cluster is that they contain high density of star at center.

Every galaxy consist of various number of globular cluster and even milky way consist of 125 to 200 cluster

answer: a. same unit

explanation:

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j