Red light of wavelength 633 nmnm from a helium-neon laser passes through a slit 0.300 wide. The diffraction pattern is observed on a screen 3.70 mm away. Define the width of a bright fringe as the distance between the minima on either side.

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.