A polar bear starts at the North Pole. It travels 1.0 km South, then 1.0 km east, then 1.0km North, then 1.0km west to return to it's starting point. The trip takes 45 min. What was the bear's average velocity?​

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.

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?