Question 3 of 32 What do electric field lines show?

A. The direction electric force would act on a positive charge
B. The direction electric force would act on a neutral charge
C. The direction that a compass would point near an electric charge
D. The direction electric force would act on a negative charge
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Frost wedging occurs when water seeps into a crack in a rock, freezes, and causes the crack in the rock to widen. t or f

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The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.