During travel, the object moving must overcome the resistance of the fluid surro

Question

During travel, the object moving must overcome the resistance of the fluid surrounding the object. In the case of an airplane (the object), the "fluid" is air. The relationship of the power required by an object to overcome the resistance of the surrounding fluid is given by the following equation, and shown in the graph. where P = power [W] v = velocity [m/s] r = density of fluid (air) [kg/m^3] A = cross sectional area of the object [m^2] Cd = coefficient of drag The units on the coefficient 4.8E-04 are: A. kg/m B. N/m C. J/m D. unitless

Explanation / Answer

P = 4.8e^-04 v^3

4.8*e^-04 = P/V^3

power units = kg.m^2/s^3

velocity units = m/s

= (kg.m^2/s^3)(s/m)^3

= kg/m

correct optio is (A)

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