Two hemispheric shells are perfectly sealed together, and the internal pressure is reduced to 25% of atmospheric pressure. Th e inner radius is 10.5 cm, and the outer radius is 10.75 cm. Th e seal is...

Two hemispheric shells are perfectly sealed together, and the internal pressure is reduced to 25% of atmospheric pressure. Th e inner radius is 10.5 cm, and the outer radius is 10.75 cm. Th e seal is located halfway between the inner and outer radius. If the atmospheric pressure is 101.3 kPa, what force is required to pull the shells apart?