Apenny has a total mass of 3.1 grams. zinc makes up 2.9 g of the penny. what is the percentage of zinc in the penny?

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

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.