Two hemispheres having an inner radius of 2 ft and wall thickness of 0.25 in. are fitted together, and the inside gauge pressure is reduced to psi. If the coefficient of static friction is between the hemispheres, determine: a. the torque T needed to initiate the rotation of the top hemisphere relative to the bottom one
b. the vertical force needed to pull the top hemisphere off the bottom one
c. the horizontal force needed to slide the top hemisphere off the bottom one.