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?

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

- decrease the number of plants and animals living in the water.

diaria maybe go see a doctor about that