The star rho1 cancri is 57 light-years from the earth and has a mass 0.85 times that of our sun. a planet has been detected in a circular orbit around rho1 cancri with an orbital radius equal to 0.11 times the radius of the earth's orbit around the sun. what are (a)the orbital speed and (b)the orbital period of the planet of rho1 cancri

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.