Author Question: If two machines have the same first-law efficiency, they must also have the same second-law ... (Read 27 times)

waynest · **on:** Jul 28, 2018

If two machines have the same first-law efficiency, they must also have the same second-law efficiency.

What will be an ideal response?

Question 2

Nuclear reactors are bombs waiting to go off.

What will be an ideal response?

chjcharjto14 · **Reply #1 on:** Jul 28, 2018

Answer to Question 1

Not so. There are differences between the first law and second-law efficiencies.
Not every system with the same first-law efficiency must have the same second-law
efficiency.

Answer to Question 2

Absolutely not. The fissile material is not nearly dense enough, at about 4, to
explode. Bomb-quality uranium has > 90 uranium-235.