K.E is a scalar product..Meaning it has only a MAGNITUDE to it and no direction..For other quantites like Force or velocity, those are vectors, meaning that it has both DIRECTION and MAGNITUDE..hence, for such quantities, there is a -ve sign existing to tell you its direction from the equilibrium..
To find the limiting reagent, its somewhat or rather like your blood question, u need to find the number of moles of the substances that are involved.
So, for your Question 1, convert the mass given to the SI units.Remember to always write the correct equation out and BALANCE it or else you...
Hmm..i got a qns here..why is it that some transformers emit a hummin sound when connected to a AC of 50 hz supply??..also, how do we know what the freq of the hum?seems like there is no link to me..:confused: