Why would U-238 or Pb-206 be more useful than C-14 when dating rocks?

What is a good example of instantaneous speed

What happens to an isotope during radioactive decay?

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.