124) A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is

125) The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

126) A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is

127) The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is

128) If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm″, the pressure at a depth of 50 m below the oil surface will be