The figure above shows the position of a moon that orbits a planet in an elliptical path. Two specific locations of the moon, position and position , are labeled.

1. As the moon orbits the planet from position to position , is the magnitude of the planet’s force due to
gravity exerted on the moon constant? Why or why not?
A
Yes, because the masses of the planet and moon remain constant.

B
Yes, because the elliptical path that the moon travels around the planet is the same for all revolutions.

C
No, because the tangential speed of the moon is always changing.

D
No, because the moon’s distance from the planet is always changing.

D

No, because the moon’s distance from the planet is always changing.

not moving. pos accel,

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