Ineed i'm stuck on a question it's a cross word "the measure of energy of motion of particles of matter

Current from a charged capacitor lights a bulb. as time goes on the brightness of the

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

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?