A 24 kg rock is hanging on at a tree at 12 m high. How much potential energy does it have?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

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.

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?