A force of magnitude F stretches a very light ideal spring a distance of D from equilibrium. What is the force constant (spring force) of the spring? What is the force constant of the spring that is stretched the same distance if the force is tripled?

Which of the following is not a characteristic of s waves? a. travel slower than p waves. b. cannot be detected in locations more than 105° from an earthquake’s epicenter. c. travel through solids and liquids. d. only affect coastal regions.

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.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island