Un elevador hidráulico se utiliza para subir un automóvil de 14,500N. si el
radio del pistón pequeño es de 4 cm y el
radio del pistón grande es de 17 cm,
encuentra la fuerza que se tiene que
ejercer sobre el pistón pequeño para
levantar el automóvil.

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?