The cross sectional area of an optical fibre is 6.3 x 10^-6 m^2 the intensity of the light entering the optical fibre is 3.2 x 10^7 w/m^2 calculate the power of the light entering the optical fibre

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)