An airplane flies a distance of 650 km at an average speed of 300km/h. how much time did the flight last

Which statement correctly describes the relationship between frequency and wavelength?

When an object is heated it contracts. a. true b. false

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.