A particle is moving in a circle of diameter 5m. Calculate the distance covered when it competes 3 revolutions. (b) (i) Define average speed. (ii) An object travels 30m in 4s and then another 30m in 2s. What is the average speed of the object? (c) Amit is moving in his car with a velocity of 45km/h. How much distance will he cover (i) in one minute and (ii) in one second.​ STEP BY STEP PLSS

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?