An astronaut is said to be weightlessness when he\she travels in a satellite. Does it mean that the earth does not attract him\her?

What are igneous intrusions and extrusions

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 atomic model was proposed as a result of j. j. thomson’s work?