In 3.0 seconds, a wave generator produces 15 pulses that spread over a distance of 45 centimeters. calculate the wave's frequency.

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.

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?