If the substance doesn't change chemically, it is a physical reaction.
D.to bring light together
Explanation:
Centripetal acceleration ac is the acceleration experienced while in uniform circular motion. It always points toward the center of rotation. It is perpendicular to the linear velocity v and has the magnitude ac=v2r;ac=rω2 a c = v 2 r ; a c = r ω 2 .
Distance=2m
because 200cm = 2m
so 4m-2m=2m
If we are being specific, the inner core has the highest density, but if not then the core in general
