what is the difference between the residence time for carbon in coal than in other parts of the carbon cycle?

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.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.