The 8.00-cm long second hand on a watch rotates smoothly.
what is its angular velocity?
what is the speed of the tip of the hand?

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

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?

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