During World War II, Sir Geoffrey Taylor, a British fluid dynamicist, used dimensional analysis to estimate the energy released by an atomic bomb explosion. He assumed that the energy released E, was a function of blast wave radius R, air density rho, and time t. Arrange these variables into a single dimensionless group, which we may term the blast wave number.

energy can cross the boundaries of a closed system in the form of heat and mass

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the fed will purchase bonds from banks to inject money into the banking system. the banks can use these funds to provide loans to individuals and businesses.

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