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?

Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

Compare and contrast physical changes with chemical changes.

Type the letter that represents the correct location for each particle type below. the neutron is found at __ the electron is found at __ the proton is found at __