Classify each of the following statements as a hypothesis,law, or theory. (a) Beethoven’s contribution to musicwould have been much greater if he had married. (b) Anautumn leaf gravitates toward the ground because thereis an attractive force between the leaf and Earth. (c) Allmatter is composed of very small particles called atoms.

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.