A car horn creates a 595 Hz tone at rest. Two cars pass on the street, each going 20.0 m/s, the first car honks. What frequency does the other car hear before they pass each other? (Speed of sound = 343 m/s) (Unit = Hz)

Plss anybody know how to do this? ? i need the answers from a through d

Auniform crate c with mass mc is being transported to the left by a forklift with a constant speed v1. what is the magnitude of the angular momentum of the crate about point a, that is, the point of contact between the front tire of the forklift and the ground

If state law mandates that elevators cannot accelerate more than 2.40 m/s2 or travel faster than 14.8 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? ?