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Peer reviewedBrimicombe, M. W. – Physics Education, 1991
A macroscopic way of modeling hot air balloons using a Newtonian approach is presented. Misleading examples using a car tire and the concept of hot air rising are discussed. Pressure gradient changes in the atmosphere are used to explain how hot air balloons work. (KR)
Descriptors: Force, Higher Education, Mechanics (Physics), Misconceptions
Peer reviewedBrouwer, W.; Paranjape, B. V. – Physics Education, 1991
The forward force of water on a hose is calculated using only the pressure gradient, the radius and length of the hose. The misconception about recoil on the nozzle is discussed. Dissipation energy and the consequent heat generation in a fluid flow are also described. (KR)
Descriptors: College Science, Energy, Fluid Mechanics, Heat
