1. A pendulum has 15-J of potential energy at the top of its swing. What is its kinetic energy at the bottom of its swing?

a) At another time the pendulum has 8-J of potential energy. What is its kinetic energy?
b) For the pendulum in “a”, what will its kinetic energy be if it loses 2-J to heat?

gravity

explanation:

battery with hi vtge high val resist in series

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