An ron ball with a diameter of d = 5 cm (λ = 60 w/mk, c.-460 j/kgk: rho = 7850 kg/m") originally had a temperature ta 225°c, suddenly the ball is streamed in by a cold fluid stream with a temperature of 25°c; the heat transfer coefficient is anid-500 w/mk. the following must be calculated: a) the temperature in the centre of the sphere 2 minutes after the start of cooling. b) the temperature inside the ball at a surface distance of 1 cm and after 2 min. c) what is the dissipated heat from the ball per m2 after this time?