How much water (m³) is left if the track is traveling horizontally at 9.81 m/s^2

A pontoon 6m x 6m x 3m floats in water with a draft of 2m. The orifice at the bottom of the pontoon is 160mm in diameter with a coefficient of discharge of C= 0.60. Determine the time required for the pontoon to sink its top after opening the orifice at the bottom.

In a rectangular open channel, 2.0 m wide, water flows at a depth of 0.8 m. It discharges over an aerated sharp crested weir over the full width, with depth over weir crest being 0.25 m/ Cc = 0.61. Adjusting for velocity head of approach, what would be the discharge through the channel? √29= 4.43 units.

A trough is 12m long, 5m wide, and 3m deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 3m, and base, on top, of length 5m). The trough is full of water (density 1000kg/m³ and g = 9.8m/s² is the acceleration due to gravity). a) Find the amount of work in joules required to empty the trough by pumping the water over the top. b) Find the amount of work in joules required to empty the trough by pumping the water out of a spout 4m high.