Two cars collide at a right-angled intersection. The first car has a mass of 1500 kg and is initially travelling 50 km/h north. The second car has mass 1300 kg and is initially travelling 40 km/h east. The two vehicles remain stuck together after the collision. What is the velocity of the combined mass after impact?

An ambulance emits a frequency of 450 hz from its siren. what frequency is heard by a man as the ambulance moves toward him? less than 450 hz more than 450 hz 450 hz 0 hz

Why there is no inductive reactance in dc circuits

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.