An airplane flies with a constant speed of 680 miles per hour. how far can it travel in 165 minutes?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

At what time will the interfering waves have an amplitudeof zero?