A student starts swinging a stone in a circle at a velocity of 9.0 meters per second. The force required to keep the stone traveling in a circle at that speed would be 80. Newtons. If the mass of the stone is
3.0 kilograms, what would be the minimum safe distance from the student?

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

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.