11.
on an atomic scale, how does the strength of electric force compare to the stren
gravitational force?
a electric force is equal to gravitational force,
b. gravitational force is stronger than electric force.
c. electric force is stronger than gravitational force,
d. scientists have not vet determined which force is stronger.

On the scale of tiny atoms, electric forces tend to be much stronger than gravitational forces. On the scale of entire celestial bodies, gravitational forces dominate.

Choice C

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day