A hand crank generator inputs 120 Joules of energy into a light bulb over the course of 2.5 seconds. Calculate the power.
P = W/t

48 watts
48 joules
300 watts
300 joules

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

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 branches of natural science include the study of an organism that lived 10 million years ago