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Tungsten-filament lightbulb emits light based on the temperature of the filament. which phenomenon does this demonstrate?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.