A woman jogs 20 km in 4 hours, then another 10 km in 2 hours. What is her average speed?

Why don't you see your reflection in water with waves or repples

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?

Does heating a metal wire increase or decrease its electrical resistance? why?