For example, the cost of a CT scanner can be as low as $65,000 for a refurbished one that produces only small images quickly. A larger and brand new CT scanner can run as high as $2.5 million.Prices are slightly higher for MRI machines, running up to about $3 million for a new machine.Ultrasound machines are much cheaper at $10,000-$200,000, depending on brand and type. larger and brand new CT scanner can run as high as $2.5 million. Prices are slightly higher for MRI machines, running up to about $3 million for a new machine. Ultrasound machines are much cheaper at $10,000-$200,000, depending on brand and type.
1 Second law of thermodynamics: In a natural thermodynamic process, the sum of the entropies of the interacting thermodynamic systems increases. 2  Equivalently, perpetual motion machines of the second kind are impossible.
So, the second law of thermodynamics might suggest that sustainability is impossible. However, the first and second laws of thermodynamics relate to âclosed systemsâ â where nothing is lost to the outside and nothing comes in from the outside. With âclosed systems,â entropy is inevitable.