The following result were obtained by an analyst in the determination of pb in soil from lead smelting contaminated site 18.6, 18.1, 17.8, 18.0, 17.8, 18.4, 18.0, 17.9 , 18.6. Calculate the mean, standard deviation and coefficient of variation for the analyses result

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

Who discovered a pattern to the elements in 1869?

How does carbon monoxide pose the greatest threat to humans? a. it can be produced by wood fires. b. it can be produced by home furnaces. c. it is produced by acid rain. d. it is produced by modern automobiles.