Barry whose mass is 75.0 kg is running at 5.5 m/s when he runs into Sam (45.0 kg). Barry experiences a 350 N force and the collision lasts for 0.75 seconds. Calculate Barry’s change in velocity? Determine Barry’s final velocity

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?

Why does lightning travel from clouds to the ground?

In which of these cases are the two wave points considered to be in phase with each other?