please answer Porosity is the fraction of material occupied by empty spaces. It can be expressed as a percent or a decimal. Assume that the porosity of a sample of sand and a sample of gravel is the same: 30 percent (0.30). Determine the porosity of a mixture of the sand and gravel, assuming that the sand fills the spaces between the gravel.
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Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.
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Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?
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please answer Porosity is the fraction of material occupied by empty spaces. It can be expressed as...
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