A45 kg ice skater at rest caught a 0.25kg ball, if the ice skater moved at 0.15 m/s after catching the ball, find the speed of the ball before he caught it.

Explain why electric current cannot exist if a current doesn't have a voltage source.

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c

The law of reflection states that the angle of reflection is equal to the angle of