Arifle with a muzzle velocity of vo shoots a bullet at a target r away at the level of the muzzle. how high above the target must the rifle be aimed so that the bullet will hit the target? (neglect air resistance.) let vo = 250 m/s and r = 100 m. find h

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.

Which describes increasing the efficiency of energy resource

When you see distant streetlights through smog, they look dimmer and redder than they do normally. but when you see the same streetlights through fog or falling snow, they look dimmer but not redder. use your knowledge of the interstellar medium to discuss the relative sizes of the particles in smog, fog, and snowstorms compared to the wavelength of light.