An astronaut is in equilibrium when he is positioned 411 km from planet X and 665 km from planet Y, along the straight line joining the planets' centers. What is the ratio of the masses X/Y?

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )