Two waves, each with intensity 40 db, interfere constructively. what is the intensity of the combined waves, in db?

An airplane flies eastward and always accelerates at a constant rate. at one position along its path it has a velocity of 34.3 m/s, it then flies a further distance of 40100 m and afterwards its velocity is 47.5 m/s. find the airplane\'s acceleration and calculate how much time elapses while the airplane covers those 40100 m.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

What is the scientific definition of energy that relates to work