Hi guys. Thirty year old tradesman from Toronto, Ontario. I'm currently doing my grade 11 university physics as a requirement of my electrical apprenticeship. I found it difficult going back to school with teenagers, there were not many older students in the night school... I'm a welder by trade, specifically structural production welder specializing in structural aluminum. I found this forum by looking up a homework question. I gotta say this is a neat little community. I hope to discover and learn from you guys! Thank you kindly.