The beam AB has a negligible mass and thickness and is subjected to a uniformly distributed loading. It is supported at one end by a pin at A and at the other end by the post BC. The post mass is having a mass of 100 kg and negligible thickness. Determine the two coefficients of static friction at B and at C so that when the magnitude of the applied force is increased to P= 200 kN, the post slips at both B and C simultaneously.

it's c (engineer's do their work with mechanical stuff not on any living being)

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.