At rest, a car’s horn sounds the note a (440 hz). the horn is sounded while the car is moving down the street. a bicyclist moving in the same direction with one-third the car’s speed hears a frequency of 415 hz. (a) is the cyclist ahead of or behind the car? (b) what is the speed of the car?

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Describe uniform velocity and variable velocity in short

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?