The actual size of a gold nucleus is approximately 7 fm. knowing this, calculate the kinetic energy (ke, or kea, however you may choose to label the measurement) that an alpha particle would need to just touch the outside of the nucleus. does this seem like a reasonable number?
hint - the lhc is currently the most powerful particle accelerator on earth, and i? t operates at 13 tev (tev = 1012 ev).

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?

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?

Which statement describes the formation of our sun? a disk formed of long trails of stars coiled into a spiral. it formed an elliptical flattened disk. heat and gases contracted within a nebula. gravity pushed stars away from a center core.