What is the scientific method 1-7?

Which substances have the lowest melting points: ionic covalent, or metallic

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.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?