8-11. 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 -10 psi. If the coefficient of static friction is ms = 0.5 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, and ( c) the horizontal force needed to slide the top hemisphere off the bottom one. | |
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