An electrostatic paint sprayer has a 0.200-m-diameter metal sphere at a potential of 25.0 kV that repels paint droplets onto a grounded object. (a) What charge is on the sphere? (b) What charge must a 0.100-mg drop of paint have to arrive at the object with a speed of 10.0 m/s?
Newton's law of cooling states that the rate of cooling (rate of change of thermal energy with respect to time) is proportional to the temperature difference between the surroundings and the surface of the object and inversely proportional to the distance d between the objects.Thus from this simple law we deduce that the heat transfer coefficient (different for different scenarios - depends on the nature of the surroundings and how they interact with the object) and the temperature difference.
So if you had a high heat transfer coefficient (lets say this hot object was in thermal contact via great good conductor of heat [metal] and ... it was a windy day) and the object was 2000 K and the surroundings 0 K - then you would find the heat transfer rate to be really high.