Across-country runner accelerates from 4 m/s to 7 m/s over the course of 5 seconds. what is the runner's average rate of acceleration? a. 0.3 m/s/s b. 0.6 m/s/s c. 1.4 m/s/s d. 2.2 m/s/s

Positrons are spontaneously emitted from the nuclei of

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?