An air-powered car is powered using high pressure compressed air stored in a tank. The pressurized tank is connected to an air-powered engine. The volume of the tank is 0.3 m3, and the initial temperature and pressure of air inside the tank is 20°C and 30 MPa, respectively. What is the efficiency of the car?
I feel like this problem is missing some relevant information. Efficiency is the ratio of work done to heat provided. None of that information is given; there is no information on the engine itself, its process, or any work done.
Am I misunderstanding this question?