Jamal is in a car going north. he looks out the window and thinks that the northbound traffic is moving very slowly. ellen is in a car moving south. she thinks the northbound is moving quickly. explain why jamal and ellen have different ideas about the motion of the traffic.

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

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.

What is the coefficient of kinetic friction μk between the block and the tabletop?