5. State and explain Newton's law of cooling. State the condition under which Newton's law of cooling is applicable. A body cools down from 60°C to 50°C 5minutes and to 40°C in another 8minutes. Find the temperature the surroundings​

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.