10. A taxi having constant speed of 20m/s is moving towards a stationary bus. If the bus increases its speed by a uniform acceleration of 2m/s2 while it was 100m away from the taxi, calculate the time taxi needs to
catch bus?

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.