14. A 25.0 kg rock is lifted from the ground to a height of 10 m, in a time of 5.0 s. A) What is the force necessary to lift the rock? B) What is the amount of work done? C) What is power
performed?

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.

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?