What is the percent by mass of phosphorus?

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

An observation that requires measurement is called quantitative observable or qualitative

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.