7 Fig. 1.1 shows a side view of a large tank in a marthe visitor attraction.
sea-water
Viewing
panel
tank
Fig. 1.1 (not to scale)
The tank is 51 m long and 20 m wide. The sea-water in the tank is 11m deep and has a
density of 1030 kg/m5
(a) Calculate the mass of water in the tank.
ma55
[3]

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up