Work done against friction

That means that the work done on it by the falling mass was counteracted by friction so that all the energy supplied to the block is dissipated by friction. The work done against friction is equal to the difference between the potential and kinetic energies you measured above.

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d) the number of neutrons plus the number of protons

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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