On july 15, 2004, nasa launched the aura spacecraft to study the earth's climate and atmosphere. this satellite was injected into an orbit 705 km above the earth's surface, and we shall assume a circular orbit.
(a) how many hours does it take this satellite to make one orbit?

(b) how fast (in km/s) is the aura spacecraft moving?

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) ! : )