a cylindrical reactor with a diameter of $550$mm is sealed Question $2[25$ marks$]$

a$)$ A cylindrical reactor with a diameter of $550mm$ is sealed at the top with a stainless steel $(SG=8)$ lid,

known as the head. The lid is $70mm$ thick and has a diameter of $610mm($see sketch$).$ During

maintenance, the technician loosened the bolts of the head without noticing that the pressure gauge

had a reading of $80$kPa

i$)$ What is the force which the bolts must overcome to hold the lid in position?

ii$)$ What will happen once the bolts are loosen? Motivate your answer by referring to the initial

acceleration after the bolts are loosen.