PDS AP Environmental Science 5th Period 2010-11

Four Types Of Problems E = Energy- basic unit is joules (J)- P x T P = Power- basic unit is watts (w) = J/sec- E/T T = Time- E/P Example: How much energy (in J) does a 30 w bulb if on for 30 min? E = P x T = 30 J/sec x [...]

Friday in class we learned about human population growth rates. We watched a video. Here is a link to that http://www.youtube.com/watch?v=4BbkQiQyaYc The world population is around 6.9 billion people right now. Up to 1800- 1 billion 1938- 2 billion 1960-3 1975-4 1987-5 1999-6   This graph shows the growth in population over time for humans. It [...]