this is a year 9 question please help a girl dives into sea. the sea water has a density of 1200kg, m (cubed). what is the increase in pressure as she dives from the surface of the sea to 4m below?

In what direction does the medium move relative to the direction of the wave? explain.

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?