a ball is swung in a vertical circle at the end of a string. Assuming that the total energy in the ball-earth system remains constant, show that the tension in the string at the bottom is greater than the tension at the top by 6 times the weight of the ball. Note that the radius of the circle does not affect this answer

If steel is more dense that lake water, why can a boat float

An object's buoyant force and weight mean the same thing.a. trueb. false

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.