In a hydroelectric dam, water falls 30.0m and then spins a turbine to generate electricity.

a) what is ? u of 1.0 kg of water?
express your answer with the appropriate units.
part b
suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. how many kilograms of water must pass through the turbines each second to generate 54.0mw of electricity? this is a typical value for a small hydroelectric dam.
express your answer using three decimal places.

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?

When flexing to a reflective style, one should be specific, brief and to the point, and maintain a fast and decisive pace?

If a rock weighing 54 n is submerged in a liquid with a density exactly twice that of water, what will be its new apparent weight reading in the liquid?