A piece of wood of mass 22.5 kg is attached to an ideal massless spring and allowed to hang in the Earth's gravitational field. The spring stretches 5.4 centimeters before it reaches its equilibrium position. If this system is next set into oscillation, what will be its frequency, in Hertz

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.

Asystematic approach to problem solving is called a (an)

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?