a large rectangular tub is filled to a depth of 2.60 m with olive oil, which has density 915 kg/m^3. If the tub has the length 5.00m and width 3.00 m, calculate
(a) the weight of the olive oil,
(b) the force of air pressure on the surface of the oil, and
(c) the pressure exerted upward by the bottom of the tub.