an ac circuit with a total resistance of r has an rms current of i. the circuit wraps around an iron core transistor with 50 loops. the secondary coils, leading to a different circuit, wrap with n loops. the secondary circuit has a total resistance of 40 ω. what is the rms current in the secondary circuit (6 points)? assigned values for 15.0 ω r = , i = 5.0 amp, and n = 18

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.