1) An oil layer floats on 77.03 cm of water in a tank. The pressure at the bottom of the tank is 111.32 kPA. How thick is the oil?
2) A hollow spherical shell with mass 1.95 kg rolls without slipping down a slope that makes an angle of 38.0 with the horizontal.
Find the magnitude of the acceleration acm of the center of mass of the spherical shell.
Find the magnitude of the frictional force acting on the spherical shell.