l cross-section just prior to cracking.PLEASEE!!!!

1)A reinforced concrete beam has square cross section (275mm x 275mm). There are 4 steel reinforcing bars (each of diameter 16mm). The reinforcement is symmetrically placed in each corner of the beam section, such that the distance from the centre of the bar to any edge of the section is 35 mm . It should be taken that ?steel = 7800 kg/m3 , ?concrete = 2450 kg/m3 , Econcrete =35000 MPa and Esteel = 200000 MPa, and that both materials exhibit linear elastic behavior. The concrete cracks in tension at 10 MPa. The beam can be considered as a cantilever beam of length L .a) What is the self weight per unit length of the beam?b) Under self weight only, calculate the length of the beam (L ) such that it just cracks under its selfweight.c) Now consider the same beam with the same length but it is now a simply supported beam. Anadditional point load, P , is then applied at midspan. What value of P (in conjunction with self weight) will induce cracking? Draw the stress and strain distributions for both the steel and the concrete on the critical cross-section just prior to cracking.PLEASEE!!!!