The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance 92 cm apart on the same axle. from the angular displacement 20.5 ◦ of the two bullet holes in the disks and the rotational speed 406 rev/min of the disks, we can determine the speed of the bullet. find the bullet speed for the following data: d = 90 cm, ? = 800 rev/min, and ? ? = 31.0

What happens when chlorine reacts with bromine? a. electrons move from the chlorine atoms to the bromine atoms. b. electrons move from the bromine atoms to the chlorine atoms. c. electrons are shared between the chlorine atoms and the bromine atoms. d. electrons become delocalized among the atoms.

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.

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.