Question

A small copper ball of 5 mm diameter at 500 K is dropped into an oil bath whose temperature is 300 K. the thermal conductivity of copper is 400 W/m.K, its density 9000 kg/ and its specific heat 385 J/kg K. if the heat transfer coefficient is 250 W/ and lumped analysis is assumed top be valid, the rate of fall of the temperature of the ball at the beginning will be, in K/s

Answer 1

Answer:

This is not a que of english