How does the energy needed to move an electron to a higher energy level compare to the energy emitted when the electron moves back to the lower energy level

A50.0-n box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. you observe that at one instant the box is sliding to the right at and that it stops in 2.25 s with uniform acceleration. what magnitude force does friction exert on this box

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong chain

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant