Auniform bar of metal, 0.40 m long, with a diameter of 2.0 cm, has a mass of 1.1 kg. a 1.5 mhz longitudinal wave is propagated along the length of the bar. a wave compression traverses the length of the bar in 0.12 ms. the wavelength of the longitudinal wave in the metal, in mm, is closest to:

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.