1. A drop of oil of volume 10-10 m spreads out on water to make a circular film of radius 10 m. what is the thickness
of the film?

What are atoms of the same element with varying number of neutrons

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.

Which of the following are guidelines to follow for obtaining accurate observations