time to lose all heat is directly proportional to and inversely proportional to so is proportional to . Since mars is half the radius of the earth, it will take 1/2 the time to cool.
the rate at which heat escapes from a planet is proportional to its surface area; . The amount of heat stored during the formation of a planet is proportional to its volume; . The radius R of Earth is twice of Mars. It takes Earth 5 billion years to lose all of its original heart of formation. How long will it take Mars to do so?
not sure where to being, please help