Power is measure in watts which is joules per second
Well, historical events is a broad subject, but there are specific events that could contribute to how we value and think about the environment. for example, events as broad as wars or as specific as the gulf of mexico oil spill contributes to the way we treat our environment. and, as a society, we know about global warming and pollution, and if we analyze mistakes we made in our past through events, it could be possible that it benefits our relationship and care for the environment in the future.
21.2 if you want it rounded to the tenths place 21.23722628 if not
The nucleus will have the greatest mass. Among the 3 kinds of subatomic particles, electrons are the lightest (by several orders of magnitude), protons and neutrons are much closer is magnitude, though neutrons are slightly heavier. However, in the diagram, the nucleus contains both the neutrons and the protons, so its combined mass would be heavier than either the neutrons alone or the protons alone.
