Calculate the potential energy of a ball with a mass of 2.5kg it is dropped from a roof that is 260meters from the ground. (please include units and use 10m/s/s for gravity)

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class